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2.0 Release Notes

Red Hat Software Collections 2.0

Release Notes for Red Hat Software Collections 2.0

Edition 0

Lenka Špačková

Red Hat Customer Content Services

Jaromír Hradílek

Red Hat Customer Content Services

Eliška Slobodová

Red Hat Customer Content Services

Abstract

The Red Hat Software Collections 2.0 Release Notes document the major features and contain important information about known problems in Red Hat Software Collections 2.0.
The Red Hat Developer Toolset collection is documented in the Red Hat Developer Toolset Release Notes and the Red Hat Developer Toolset User Guide.

Chapter 1. Red Hat Software Collections 2.0
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This chapter serves as an overview of the Red Hat Software Collections 2.0 content set. It provides a list of components and their descriptions, sums up changes in this version, documents relevant compatibility information, and lists known issues.

1.1. About Red Hat Software Collections
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For certain applications, more recent versions of some software components are often needed in order to use their latest new features. Red Hat Software Collections is a Red Hat offering that provides a set of dynamic programming languages, database servers, and various related packages that are either more recent than their equivalent versions included in the base Red Hat Enterprise Linux system, or are available for this system for the first time. For a complete list of components that are distributed as part of Red Hat Software Collections and a brief summary of their features, see Section 1.2, “Main Features”.
Red Hat Software Collections does not replace the default system tools provided with Red Hat Enterprise Linux 6 or Red Hat Enterprise Linux 7. Instead, a parallel set of tools is installed in the /opt/ directory and can be optionally enabled per application by the user using the supplied scl utility. The default versions of Perl or PostgreSQL, for example, remain those provided by the base Red Hat Enterprise Linux system.
All Red Hat Software Collections components are fully supported under Red Hat Enterprise Linux Subscription Level Agreements, are functionally complete, and are intended for production use. Important bug fix and security errata are issued to Red Hat Software Collections subscribers in a similar manner to Red Hat Enterprise Linux for at least three years from the release of each major version. A new major version of Red Hat Software Collections is released approximately every 18 months, and in each major release stream, each version of a selected component remains backward compatible. For detailed information about length of support for individual components, refer to the Red Hat Software Collections Product Life Cycle document.
Red Hat Developer Toolset is now part of Red Hat Software Collections, included as a separate Software Collection. For more information about Red Hat Developer Toolset, refer to the Red Hat Developer Toolset Release Notes and the Red Hat Developer Toolset User Guide.

1.2. Main Features
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Red Hat Software Collections 2.0 provides recent stable versions of the tools listed in Table 1.1, “Red Hat Software Collections 2.0 Components”.
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Table 1.1. Red Hat Software Collections 2.0 Components
Component Software Collection Description
Red Hat Developer Toolset 3.1 devtoolset-3 Red Hat Developer Toolset is designed for developers working on the Red Hat Enterprise Linux platform. It provides current versions of the GNU Compiler Collection, GNU Debugger, Eclipse development platform, and other development, debugging, and performance monitoring tools. For a complete list of components, see the Red Hat Developer Toolset Components table in the Red Hat Developer Toolset User Guide.
Perl 5.20.1 rh-perl520 A release of Perl, a high-level programming language that is commonly used for system administration utilities and web programming. The rh-perl520 Software Collection provides additional utilities, scripts, and database connectors for MySQL and PostgreSQL. Also, it includes the DateTime Perl module and the mod_perl Apache httpd module, which is supported only with the httpd24 Software Collection.
PHP 5.4.40 php54 A release of PHP with PEAR 1.9.4 and a number of additional extensions. PHP 5.4 provides a number of language and interface improvements. The memcache and Zend OPcache extensions are also included.
PHP 5.5.21 php55 A release of PHP with PEAR 1.9.4 and enhanced language features including better exception handling, generators, and Zend OPcache. The memcache and mongodb extensions are also included.
PHP 5.6.5 rh-php56 A release of PHP with PEAR 1.9.5 and enhanced language features including constant expressions, variadic functions, arguments unpacking, and the interactive debugger. The memcache, mongo, and XDebug extensions are also included.
Python 2.7.8 python27 A release of Python 2.7 with a number of additional utilities. This Python version provides various new features and enhancements, including a new ordered dictionary type, faster I/O operations, and improved forward compatibility with Python 3. The python27 Software Collections contains the Python 2.7.8 interpreter, a set of extension libraries useful for programming web applications and mod_wsgi (only supported with the httpd24 Software Collection), MySQL and PostgreSQL database connectors, and numpy and scipy.
Python 3.4.2 rh-python34 A release of Python 3 with a number of additional utilities. This Software Collection gives developers on Red Hat Enterprise Linux access to Python 3 and allows them to benefit from various advantages and new features of this version. The rh-python34 Software Collection contains Python 3.4.2 interpreter, a set of extension libraries useful for programming web applications and mod_wsgi (only supported with the httpd24 Software Collection), PostgreSQL database connector, and numpy and scipy.
Ruby 2.2.2 rh-ruby22 A release of Ruby 2.2. This version provides substantial performance and reliability improvements, including incremental and symbol garbage collection and many others, while maintaining source level backward compatibility with Ruby 2.0.0 and Ruby 1.9.3.
Ruby on Rails 4.1.5 rh-ror41 A release of Ruby on Rails 4.1, a web application development framework written in the Ruby language. This version provides a number of new features including Spring application preloader, config/secrets.yml, Action Pack variants, and Action Mailer previews. This Software Collection is supported together with the rh-ruby22 Collection.
MariaDB 10.0.17 rh-mariadb100 A release of MariaDB, an alternative to MySQL for users of Red Hat Enterprise Linux. For all practical purposes, MySQL is binary compatible with MariaDB and can be replaced with it without any data conversions. This version adds the PAM authentication plugin to MariaDB.
MongoDB 2.6.9 rh-mongodb26 A release of MongoDB, a cross-platform document-oriented database system classified as a NoSQL database. This Software Collection includes the mongo-java-driver package.
MySQL 5.6.24 rh-mysql56 A release of MySQL, which provides a number of new features and enhancements, including improved performance.
PostgreSQL 9.4.1 rh-postgresql94 A release of PostgreSQL, which provides a number of enhancements, including improved scalability (bi-directonal replication, cascading replication), increased flexibility of native JSON support, and improved performance.
Node.js 0.10 nodejs010 A release of Node.js with npm 1.4.28 and support for the SPDY protocol version 3.1. This Software Collection gives users of Red Hat Enterprise Linux access to this programming platform.
nginx 1.6.2 nginx16 A release of nginx, a web and proxy server with a focus on high concurrency, performance and low memory usage. This version introduces a number of new features, including various SSL improvements, support for SPDY 3.1, cache revalidation with conditional requests, and authentication request module.
Apache httpd 2.4.12 httpd24 A release of the Apache HTTP Server (httpd), including a high performance event-based processing model, enhanced SSL module and FastCGI support. The mod_auth_kerb module is also included.
Thermostat 1.2.0 thermostat1 A release of Thermostat, a monitoring and instrumentation tool for the OpenJDK HotSpot JVM, with support for monitoring multiple JVM instances. This Software Collection depends on the rh-mongodb26 and rh-java-common components.
DevAssistant 0.9.3 devassist09 A release of DevAssistant, a tool designed to assist developers with creating and setting up basic projects in various programming languages, installing dependencies, setting up a development environment, and working with source control. DevAssistant supports the C, C++, Java, and Python programming languages but it is able to support working with any other language, framework, or tool due to its modular architecture.
Maven 3.0.5 maven30 A release of Maven, a software project management and comprehension tool used primarily for Java projects. Based on the concept of a project object model (POM), Maven can manage a project's build, reporting, and documentation from a central piece of information.
Passenger 4.0.50 rh-passenger40 A release of Phusion Passenger, a web and application server, designed to be fast, robust, and lightweight. It supports Ruby using the ruby193, ruby200, or rh-ruby22 Software Collections together with Ruby on Rails using the ror40 or rh-ror41 Collections. It can also be used with nginx 1.6 from the nginx16 Software Collection and with Apache httpd from the httpd24 Software Collection.
Common Java Packages 1.1 rh-java-common This Software Collection provides common Java libraries and tools used by other collections. The rh-java-common Software Collection is required by the devtoolset-3, maven30, rh-mongodb26, and thermostat1 components.
V8 3.14.5.10 v8314 This Software Collection provides the V8 JavaScript engine and is supported only as a dependency for the mongodb24, rh-mongodb26, ruby193, ror40, rh-ror41, and nodejs010 Software Collections.
Previously released Software Collections remain available in the same distribution channels. For example, the git19 Software Collection, which provides Git 1.9.4, has not been updated since Red Hat Software Collections 1.2 but still can be installed along with the Red Hat Software Collections 2.0 components or other previously released components.
All currently available Software Collections are listed in the Table 1.2, “All Available Software Collections”. For detailed information regarding components that have not been updated since Red Hat Software Collections 1, refer to the Red Hat Software Collections 1.2 Release Notes. See the Red Hat Software Collections Product Life Cycle document for information on the length of support for individual components.
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Table 1.2. All Available Software Collections
Component Software Collection
Components New in Red Hat Software Collections 2.0
Perl 5.20.1rh-perl520
PHP 5.6.5rh-php56
Python 3.4.2rh-python34
Ruby 2.2.2rh-ruby22
Ruby on Rails 4.1.5rh-ror41
MariaDB 10.0.17rh-mariadb100
MongoDB 2.6.9rh-mongodb26
MySQL 5.6.24rh-mysql56
PostgreSQL 9.4.1rh-postgresql94
Passenger 4.0.50rh-passenger40
Common Java Packages 1.1rh-java-common
Table 1.2. All Available Software Collections
Components Updated in Red Hat Software Collections 2.0
Red Hat Developer Toolset 3.1devtoolset-3
PHP 5.4.40php54
PHP 5.5.21php55
Python 2.7.8python27
Node.js 0.10nodejs010
nginx 1.6.2nginx16
Apache httpd 2.4.12httpd24
Thermostat 1.2.0thermostat1
DevAssistant 0.9.3devassist09
Maven 3.0.5maven30
V8 3.14.5.10v8314
Table 1.2. All Available Software Collections
Components Not Updated since Red Hat Software Collections 1
Git 1.9.4git19
Perl 5.16.3perl516
Python 3.3.2python33
Ruby 1.9.3ruby193
Ruby 2.0.0ruby200
Ruby on Rails 4.0.2ror40
MariaDB 5.5.37mariadb55
MongoDB 2.4.9mongodb24
MySQL 5.5.37mysql55
PostgreSQL 9.2.8postgresql92

1.3.1. Overview
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New Software Collections
Red Hat Software Collections 2.0 adds these new Software Collections:
Updated Software Collections
The following components have been updated in Red Hat Software Collections 2.0:
The further detailed sections describe changes since Red Hat Software Collections 1.2.

1.3.2. Changes in Red Hat Developer Toolset
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Red Hat Software Collections 2.0 is released with Red Hat Developer Toolset 3.1. The following components have been upgraded in this release:
  • Eclipse to version 4.4.2
  • GCC to version 4.9.2
  • elfutils to version 0.161
  • GDB to version 7.8.2
  • SystemTap to version 2.6
  • Valgrind to version 3.10.1
  • Dyninst to version 8.2.1
The Red Hat Developer Toolset 3.1 release also includes a bug fix update of ltrace and enhancement update of memstomp. For detailed information on changes in Red Hat Developer Toolset, see Red Hat Developer Toolset User Guide.
Red Hat Developer Toolset 3.1 introduces the devtoolset-3-dockerfiles subpackage for Red Hat Enterprise Linux 7. This package contains Dockerfiles for selected Red Hat Developer Toolset components, including their Red Hat Enterprise Linux 6 versions, which can be deployed only on Red Hat Enterprise Linux 7 Server. For details, see Red Hat Developer Toolset User Guide.

1.3.3. Changes in Perl
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Perl 5.20.1, shipped in the new rh-perl520 Software Collection, introduces various changes and improvements, for example:
  • Hashes have been randomized by default; the order in which keys and values are returned from a hash now changes on each Perl run
  • Enabling locale now affects the character type
  • Support for Unicode 6.3 has been added
  • New hash slices have been added.

1.3.4. Changes in PHP
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PHP 5.4
The php54 Software Collection has been upgraded to version 5.4.40, which provides a number of bug fixes over the version shipped in Red Hat Software Collections 1.
PHP 5.5
The updated php55 Software Collection includes PHP 5.5.21 with multiple bug fixes over the version shipped in Red Hat Software Collections 1.
PHP 5.6
The new rh-php56 Software Collection includes PHP 5.6.5 with PEAR 1.9.5 and the memcache, mongo, and XDebug extensions. This version provides a number of language and interface improvements. Refer to the upstream documentation on migration and the documentation for the PHP Interactive Debugger, which is provided by the rh-php56-php-dbg package.

1.3.5. Changes in Python
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Python 2
The python27 Software Collection has been upgraded to version 2.7.8, which provides numerous security and bug fixes. This Software Collection now includes the python-wheel and python-pip modules.
Python 3
The new rh-python34 Software Collection includes Python 3.4.2, which provides numerous security fixes and several new features. Among others:
  • The pathlib module providing object-oriented file system path
  • Enumerated type (enum) is now part of the Python standard library (PEP 435)
  • Import-related standard library module changes
  • A new statistics module
  • The asyncio module, which enables writing code that concurrently handles asynchronous network based interactions.
This update also includes several changes to improve security, for example:
  • Certificates are now verified by default in the httplib module
  • TLSv1.1 and TLSv1.2 support for SSL has been added
  • Server-side Server Name Indication (SNI) support for SSL has been added.

1.3.6. Changes in Ruby
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The new rh-ruby22 Software Collection contains Ruby 2.2.2, which provides substantial performance and reliability improvements, including:
  • A new incremental garbage collection (GC) algorithm has been included
  • Symbols are now garbage collectable
  • Minor improvements on the core classes and the standard library have been introduced.
Ruby 2.2 is backward compatible with Ruby 2.0.0 and Ruby 1.9.3. The ruby193 and ruby200 Software Collections are still available. For information about length of support for these components, refer to the Red Hat Software Collections Product Life Cycle document. Note that upstream development of Ruby 1.9.3 has been terminated and it is advisable to migrate to the rh-ruby22 Software Collection.

1.3.7. Changes in Ruby on Rails
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Ruby on Rails 4.1.5, shipped in the new rh-ror41 Software Collection, provides the following major new features:
  • Spring Application Preloader to speed up development
  • The config/secrets.yml file, which can be used to store multiple secrets and access keys
  • Action Pack Variants to render different templates for phones, tablets, and browsers
  • Action Mailer Previews for email viewing
  • Active Record enums
  • Message Verifiers to generate and verify signed messages
  • A new Module#concerning to separate responsibilities within a class
  • Cross-site request forgery (CSRF) protection from remote <script> tags.
The rh-ror41 Software Collection is supported together with the rh-ruby22 Collection.

1.3.8. Changes in MariaDB
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The new rh-mariadb100 Software Collection includes MariaDB 10.0.17, which provides a number of bug fixes, performance improvements, and enhancements over the version shipped in Red Hat Software Collections 1. The most notable changes are:
  • Parallel replication, which enables MariaDB to execute queries on the slave in parallel
  • Global transaction ID, which allows to easily change a slave server to connect to and a master server to replicate from; the state of the slave is recorded in a crash-safe way
  • Multi-source replication, which means that one server has multiple masters from which it replicates
  • New NoSQL features that add access to diverse data sources dynamically
  • New sharding features that allow database tables to be split across servers.
For more information regarding features in MariaDB 10.0, refer to the upstream resources. For information about migrating to the rh-mariadb100 Software Collection, see Section 5.1, “Migrating to MariaDB 10.0”.
For all practical purposes, MariaDB is a binary drop in replacement of the same MySQL version. For example, My SQL5.5 is compatible with MariaDB 5.5 and also in practice with MariaDB 10.0. For more information about MariaDB and MySQL compatibility, see the MariaDB documentation. Incompatibilities between MariaDB 10.0 and MySQL 5.6 are described in this section.

1.3.9. Changes in MongoDB
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MongoDB 2.6.9, included in the new rh-mongodb26 Software Collection, provides a number of bug fixes and enhancements over the version shipped in Red Hat Software Collections 1. For example:
  • Aggregation enhancements — the aggregation pipeline adds the ability to return result sets of any size, either by returning a cursor or writing the output to a collection
  • Text search integration — text search is now enabled by default and the query system includes the $text operator, which resolves text-search queries
  • Improvements to the update and insert systems, which include additional operations and improvements that increase consistency of modified data
  • A new authorization model that provides the ability to create custom User-Defined Roles and the ability to specify user privileges at a collection-level granularity.
For detailed information on changes in MongoDB 2.6, refer to the MongoDB documentation. For information about migrating to the rh-mongodb26 Software Collection, see Section 5.2, “Migrating to MongoDB 2.6”.

1.3.10. Changes in MySQL
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The new rh-mysql56 Software Collection includes MySQL 5.6.24, which provides a number of bug fixes, performance improvements, and enhancements over the version shipped in Red Hat Software Collections 1. Among others:
  • Parallel replication, which enables MySQL to execute queries on the slave in parallel
  • Global transaction ID, which allows to easily change a slave server to connect to and a master server to replicate from; the state of the slave is recorded in a crash-safe way
  • InnoDB memcached plug-in, which enables direct access to InnoDB tables using the memcached protocol and client libraries
  • New NoSQL-style memcached APIs
  • Optimizer improvements for all-around query performance
  • Partitioning improvements for querying and managing huge tables
  • Improved performance monitoring using the Performance Schema.
For more information about changes in MySQL 5.6, refer to the MySQL documentation. For information about migrating to the rh-mysql56 Software Collection, see Section 5.3, “Migrating to MySQL 5.6”.

1.3.11. Changes in PostgreSQL
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PostgreSQL 9.4.1, provided by the new rh-postgresql94 Software Collection, includes the following most notable changes:
  • Increased flexibility with the new JSONB datatype, which enables users to use both relational and non-relational data stores at the same time
  • Increased scalability with Logical Decoding that supplies a new API for reading, filtering and manipulating the PostgreSQL replication stream. This interface is the foundation for new replication tools, such as Bi-Directional Replication.
  • Increased performance with improvements to GIN indexes, concurrently updatable Materialized Views for faster, more up-to-date reporting, parallel writing to the transaction log, and support for Linux huge pages.
  • Event trigger support for DDL
  • Improved materialized view, which can, for example, be refreshed without blocking concurrent reads
  • Updatable views
For detailed changes, see the PostgreSQL 9.3 Release Notes and the PostgreSQL 9.4 Release Notes. For information about migrating to the rh-postgresql94 Software Collection, see Section 5.4, “Migrating to PostgreSQL 9.4”.

1.3.12. Changes in Node.js
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The nodejs010 Software Collection has been upgraded to upstream version 0.10.35, which provides a number of bug fixes and enhancements over the version shipped in Red Hat Software Collections 1. Among others:
  • Support for the SPDY protocol version 3.1 has been included for both Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7
  • The nodejs010 Software Collection is now fully supported.

1.3.13. Changes in nginx
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The nginx16 Software Collection has been upgraded to version 1.6.2, which provides several bug fixes and enhancements over the version shipped in Red Hat Software Collections 1. For example:
  • Support for Passenger has been added — see Section 4.7, “Passenger” for details
  • This update includes support for SPDY 3.1 for both Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.

1.3.14. Changes in Apache httpd
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The httpd24 Software Collection has been upgraded to version 2.4.12, which provides numerous bug fixes and enhancements over the version shipped in Red Hat Software Collections 1. Among others:
  • Support for Passenger has been added — see Section 4.7, “Passenger” for details
  • Support for Elliptic curve Diffie–Hellman (ECDH) has been added
  • Support for Unix Domain Socket (UDS) in the mod_proxy_fcgi module has been improved
  • Installation of the mod_ssl module in FIPS mode has been fixed.

1.3.15. Changes in Thermostat
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The thermostat1 Software Collection has been upgraded to version 1.2.0, which introduces several new features:
  • A new instrumenting profiler plug-in has been added
  • The setup of secured Thermostat using web storage has been simplified; the default setup has been changed to use HTTP-based storage
  • Various improvements have been introduced, for example, in the Swing client GUI and in a number of charts.
Note that data migration and automatic user plug-in migration is not supported from Thermostat 1.0.4 to Thermostat 1.2. For details, refer to the Thermostat documentation.

1.3.16. Changes in DevAssistant
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The devassist09 Software Collection has been upgraded to version 0.9.3, which provides various bug fixes and several minor improvements, for example:
  • GitHub token is no longer logged for security reasons
  • Icons in the PNG format are supported in the DevAssistant GUI
  • Error messages can now be ignored when running commands in assistants.
For information about possible incompatibility with the previous version of DevAssistant, see Section 4.5.4, “Backward Compatibility in DevAssistant”.

1.4. Compatibility Information
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Red Hat Software Collections 2.0 is available for all supported releases of Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7 on AMD64 and Intel 64 architectures.

1.5. Known Issues
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rh-mysql56, rh-mariadb100 components, BZ#1194611
The rh-mysql56-mysql-server and rh-mariadb100-mariadb-server packages no longer provide the test database by default. Although this database is not created during initialization, the grant tables are prefilled with the same values as when test was created by default. As a consequence, upon a later creation of the test or test_* databases, these databases have less restricted access rights than is default for new databases.
Additionally, when running benchmarks, the run-all-tests script no longer works out of the box with example parameters. You need to create a test database before running the tests and specify the database name in the --database parameter. If the parameter is not specified, test is taken by default but you need to make sure the test database exist.
httpd24 component, BZ#1224763
When using the mod_proxy_fcgi module with FastCGI Process Manager (PHP-FPM), httpd uses port 8000 for the FastCGI protocol by default instead of the correct port 9000. To work around this problem, specify the correct port explicitly in configuration.
rh-passanger40 component, BZ#1196555
When Passenger from the rh-passenger40 Software Collection is run as a module for httpd, the functionality is restricted by SELinux policy. To work around this problem, switch the passenger domain to permissive mode by running the following command as root: 
semanage permissive -a passenger_t
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Standalone server and nginx integration are not affected by this issue.
mongodb24 component
The mongodb24 Software Collection from Red Hat Software Collections 1.2 cannot be rebuilt with the rh-java-common and maven30 Software Collections shipped with Red Hat Software Collections 2.0. Additionally, the mongodb24-build and mongodb24-scldevel packages cannot be installed with Red Hat Software Collections 2.0 due to unsatisfied requires on the maven30-javapackages-tools and maven30-maven-local packages. When the mongodb24-scldevel package is installed, broken dependencies are reported and the yum --skip-broken command skips too many packages. Users are advised to update to the rh-mongodb26 Software Collection.
perl component
When the user tries to use the mod_perl module from both the rh-perl520 and perl516 Software Collections, a conflict in the /opt/rh/httpd24/root/usr/lib64/httpd/modules/mod_perl.so file occurs. As a consequence, it is impossible to use mod_perl from more than one Perl Software Collection.
nodejs010 component
Shared libraries provided by the nodejs010 Software Collection, namely libcares, libhttp_parser, and libuv, are not properly prefixed with the Collection name. As a consequence, conflicts with the corresponding system libraries might occur.
nodejs-hawk component
The nodejs-hawk package uses an implementation of the SHA-1 and SHA-256 algorithms adopted from the CryptoJS project. In this release, the client-side JavaScript is obfuscated. The future fix will involve using crypto features directly from the CryptoJS library.
postgresql component
The rh-postgresql94 and postgresql92 packages for Red Hat Enterprise Linux 6 do not provide the sepgsql module as this feature requires installation of libselinux version 2.0.99, which is not available in Red Hat Enterprise Linux 6.
httpd, mariadb, mongodb, mysql, nodejs, perl, php55, rh-php56, python, ruby, ror, thermostat, and v8314 components, BZ#1072319
When uninstalling the httpd24, mariadb55, rh-mariadb100, mongodb24, rh-mongodb26, mysql55, rh-mysql56, nodejs010, perl516, rh-perl520, php55, rh-php56, python27, python33, rh-python34, ruby193, ruby200, rh-ruby22, ror40, rh-ror41, thermostat1, or v8314 packages, the order of uninstalling can be relevant due to ownership of dependent packages. As a consequence, some directories and files might not be removed properly and might remain on the system.
mariadb, mysql, postgresql, mongodb components
Red Hat Software Collections 2.0 contains the MySQL 5.6, MariaDB 10.0, PostgreSQL 9.4 and MongoDB 2.6 databases. The core Red Hat Enterprise Linux 6 provides earlier versions of the MySQL and PostgreSQL databases (client library and daemon). The core Red Hat Enterprise Linux 7 provides earlier versions of the MariaDB and PostgreSQL databases (client library and daemon). Client libraries are also used in database connectors for dynamic languages, libraries, and so on.
The client library packaged in the Red Hat Software Collections database packages in the PostgreSQL component is not supposed to be used, as it is included only for purposes of server utilities and the daemon. Users are instead expected to use the system library and the database connectors provided with the core system.
A protocol, which is used between the client library and the daemon, is stable across database versions, so, for example, using the PostgreSQL 9.2 client library with the PostgreSQL 9.4 daemon works as expected.
The core Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7 do not include the client library for MongoDB. In order to use this client library for your application, you should use the client library from Red Hat Software Collections and always use the scl enable ... call every time you run an application linked against this MongoDB client library.
mariadb, mysql, mongodb components
MariaDB, MySQL, and MongoDB do not make use of the /opt/provider/collection/root prefix when creating log files. Note that log files are saved in the /var/opt/provider/collection/log/ directory, not in /opt/provider/collection/root/var/log/.
httpd component
Compiling external applications against the Apache Portable Runtime (APR) and APR-util libraries from the httpd24 Software Collection is not supported. The LD_LIBRARY_PATH is not set in httpd24 because it is not required by any application in this Software Collection.
httpd, ruby193 components, BZ#1071145
In Red Hat Enterprise Linux 6.5 and earlier versions, httpd is unable to execute the binary files in the mod_passenger module, namely PassengerWatchdog, PassengerHelperAgent, PassengerLoggingAgent, and SpawnPreparer in the /opt/rh/ruby193/root/usr/lib64/gems/exts/passenger-4.0.18/agents/ directory. To work around this problem, disable SELinux by running the following command as root: 
setenforce 0
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nginx component, BZ#1045041
In Red Hat Enterprise Linux 6.5 and earlier versions, no SELinux policy is applied for the nginx daemon.
python27 component
In Red Hat Enterprise Linux 7, when the user tries to install the python27-python-debuginfo package, the /usr/src/debug/Python-2.7.5/Modules/socketmodule.c file conflicts with the corresponding file from the python-debuginfo package installed on the core system. Consequently, installation of the python27-python-debuginfo fails. To work around this problem, uninstall the python-debuginfo package and then install the python27-python-debuginfo package.
devassist component
When the user tries to rebuild the devassist09-PyYAML package on Red Hat Enterprise Linux 6, the build fails due to a soft dependency, if the Pyrex or Cython programming languages are detected. To work around this problem, make sure the pyrex or cython packages are not installed on your system.

Other Notes

rh-ruby22, rh-python34, rh-php56 components
Using Software Collections on a read-only NFS has several limitations.
  • Ruby gems cannot be installed while the rh-ruby22 Software Collection is on a read-only NFS. Consequently, for example, when the user tries to install the ab gem using the gem install ab command, the following error message is displayed: 
    ERROR:  While executing gem ... (Errno::EROFS)
    Read-only file system @ dir_s_mkdir - /opt/rh/rh-ruby22/root/usr/local/share/gems
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    The same problem occurs when the user tries to update or install gems from an external source by running the bundle update or bundle install commands.
  • When installing Python packages on a read-only NFS using the Python Package Index (PyPI), running the pip command fails with an error message similar to this: 
    Read-only file system: '/opt/rh/rh-python34/root/usr/lib/python3.4/site-packages/ipython-3.1.0.dist-info'
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  • Installing packages from PHP Extension and Application Repository (PEAR) on a read-only NFS using the pear command fails with the error message: 
    Cannot install, php_dir for channel "pear.php.net" is not writeable by the current user
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This is an expected behavior.
thermostat component
Previously, it was sufficient to start the Thermostat storage and agent back ends by running the thermostat service command. With this update, it is necessary to first run the thermostat-setup command and then configure the agent manually with credentials in the agent.auth file. For details, refer to the Thermostat User Guide.
thermostat component
The thermostat1-thermostat-tomcat start command, which starts the Thermostat web storage endpoint, can be used only on Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7.0. On Red Hat Enterprise Linux 7.1 and later versions, use service tomcat@thermostat start instead.
httpd component
Language modules for Apache are supported only with the Red Hat Software Collections version of Apache httpd and not with the Red Hat Enterprise Linux system versions of httpd. For example, the mod_wsgi module from the rh-python34 Collection can be used only with the httpd24 Collection.
all components
Since Red Hat Software Collections 2.0, configuration files, variable data, and runtime data of individual Collections are stored in different directories than in previous versions of Red Hat Software Collections.
coreutils component
Some utilities, for example, su, login, or screen, do not export environment settings in all cases, which can lead to unexpected results. It is therefore recommended to use sudo instead of su and set the env_keep environment variable in the /etc/sudoers file. Alternatively, you can run commands in a reverse order; for example: 
su -l postgres -c "scl enable rh-postgresql94 psql"
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instead of 
scl enable rh-postgresql94 bash
su -l postgres -c psql
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When using tools like screen or login, you can use the following command to preserve the environment settings: 
source /opt/rh/<collection_name>/enable
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php54 component
Note that Alternative PHP Cache (APC) in Red Hat Software Collections is provided for user data cache only. For opcode cache, Zend OPcache is provided.
python component
When the user tries to install more than one scldevel package from the python27, python33, and rh-python34 Software Collections, a transaction check error message is returned. This is an expected behavior because the user can install only one set of the macro files provided by the packages (%scl_python, %scl_prefix_python).
php component
When the user tries to install more than one scldevel package from the php54, php55, and rh-php56 Software Collections, a transaction check error message is returned. This is an expected behavior because the user can install only one set of the macro files provided by the packages (%scl_php, %scl_prefix_php).
ruby component
When the user tries to install more than one scldevel package from the ruby193, ruby200, and rh-ruby22 Software Collections, a transaction check error message is returned. This is an expected behavior because the user can install only one set of the macro files provided by the packages (%scl_ruby, %scl_prefix_ruby).
perl component
When the user tries to install more than one scldevel package from the perl516 and rh-perl520 Software Collections, a transaction check error message is returned. This is an expected behavior because the user can install only one set of the macro files provided by the packages (%scl_perl, %scl_prefix_perl).
nodejs component
When installing the nodejs010 Software Collection, nodejs010 installs GCC in the base Red Hat Enterprise Linux system as a dependency, unless the gcc packages are already installed.

Chapter 2. Installation
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This chapter describes in detail how to get access to the content set, install Red Hat Software Collections 2.0 on the system, and rebuild Red Hat Software Collections.
The Red Hat Software Collections content set is available to customers with Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7 subscriptions listed at https://access.redhat.com/solutions/472793. Depending on the subscription management service with which you registered your Red Hat Enterprise Linux system, you can either enable Red Hat Software Collections by using Red Hat Subscription Management, or by using RHN Classic. For detailed instructions on how to enable Red Hat Software Collections using RHN Classic or Red Hat Subscription Management, see the respective section below. For information on how to register your system with one of these subscription management services, see Using and Configuring Red Hat Subscription Manager.

2.1.1. Using Red Hat Subscription Management
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If your system is registered with Red Hat Subscription Management, complete the following steps to attach the subscription that provides access to the repository for Red Hat Software Collections and enable the repository:
  1. Display a list of all subscriptions that are available for your system and determine the pool ID of a subscription that provides Red Hat Software Collections. To do so, type the following at a shell prompt as root: 
    subscription-manager list --available
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    For each available subscription, this command displays its name, unique identifier, expiration date, and other details related to it. The pool ID is listed on a line beginning with Pool Id.
  2. Attach the appropriate subscription to your system by running the following command as root: 
    subscription-manager attach --pool=pool_id
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    Replace pool_id with the pool ID you determined in the previous step. To verify the list of subscriptions your system has currently attached, type as root: 
    subscription-manager list --consumed
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  3. Display the list of available Yum list repositories to retrieve repository metadata and determine the exact name of the Red Hat Software Collections repositories. As root, type: 
    subscription-manager repos --list
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    Or alternatively, run yum repolist all for a brief list.
    The repository names depend on the specific version of Red Hat Enterprise Linux you are using and are in the following format: 
    rhel-variant-rhscl-6-rpms
rhel-variant-rhscl-6-debug-rpms
rhel-variant-rhscl-6-source-rpms

rhel-server-rhscl-6-eus-rpms
rhel-server-rhscl-6-eus-source-rpms
rhel-server-rhscl-6-eus-debug-rpms

rhel-variant-rhscl-7-rpms
rhel-variant-rhscl-7-debug-rpms
rhel-variant-rhscl-7-source-rpms

rhel-server-rhscl-7-eus-rpms
rhel-server-rhscl-7-eus-source-rpms
rhel-server-rhscl-7-eus-debug-rpms
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    Replace variant with the Red Hat Enterprise Linux system variant, that is, server or workstation. Note that Red Hat Software Collections is supported neither on the Client nor on the ComputeNode variant.
  4. Enable the appropriate repository by running the following command as root: 
    subscription-manager repos --enable repository
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Once the subscription is attached to the system, you can install Red Hat Software Collections as described in Section 2.2, “Installing Red Hat Software Collections”. For more information on how to register your system using Red Hat Subscription Management and associate it with subscriptions, see Using and Configuring Red Hat Subscription Manager.

2.1.2. Using RHN Classic
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If your system is registered with RHN Classic, complete the following steps to subscribe to Red Hat Software Collections:
  1. Display a list of all channels that are available to you and determine the exact name of the Red Hat Software Collections channel. To do so, type the following at a shell prompt as root: 
    rhn-channel --available-channels
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    The name of the channel depends on the specific version of Red Hat Enterprise Linux you are using and is in the following format, where variant is the Red Hat Enterprise Linux system variant (server or workstation): 
    rhel-x86_64-variant-6-rhscl-1

rhel-x86_64-server-6.5.z-rhscl-1
rhel-x86_64-server-6.6.z-rhscl-1

rhel-x86_64-variant-7-rhscl-1

rhel-x86_64-server-7.1.eus-rhscl-1
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    Red Hat Enterprise Linux 7 channels are accessible only through Red Hat Satellite instances.

    Note

    Red Hat Software Collections 2.x are distributed in the same channels as Red Hat Software Collections 1.x.
  2. Subscribe the system to the Red Hat Software Collections channel by running the following command as root: 
    rhn-channel --add --channel=channel_name
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    Replace channel_name with the name you determined in the previous step.
  3. Verify the list of channels you are subscribed to. As root, type: 
    rhn-channel --list
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When the system is subscribed, you can install Red Hat Software Collections as described in Section 2.2, “Installing Red Hat Software Collections”. For more information on how to register your system with RHN Classic, see Using and Configuring Red Hat Subscription Manager.

2.1.3. Packages from the Optional Channel
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Some of the Red Hat Software Collections 2.0 packages require the Optional channel to be enabled in order to complete the full installation of these packages. For detailed instructions on how to subscribe your system to this channel, see the relevant Knowledgebase articles on Red Hat Customer Portal: https://access.redhat.com/solutions/392003 for Red Hat Subscription Management or https://access.redhat.com/solutions/70019 if your system is registered with RHN Classic.
Packages from Software Collections for Red Hat Enterprise Linux 6 that require the Optional channel to be enabled are listed in the following table.
Expand
Table 2.1. Packages Requiring Enabling of the Optional Channel in Red Hat Enterprise Linux 6
Package from a Software CollectionRequired Package from the Optional Channel
devtoolset-3-dyninst-testsuiteglibc-static
git19-git-cvscvsps
git19-perl-Git-SVNperl-YAML, subversion-perl
mariadb55-mariadb-benchperl-GD
mysql55-mysql-benchperl-GD
php54-php-imaplibc-client
php54-php-recoderecode
php54-php-imaplibc-client
php54-php-recoderecode
php55-php-imaplibc-client
php55-php-recoderecode
rh-mariadb100-mariadb-benchperl-GD
rh-mysql56-mysql-benchperl-GD
rh-php56-php-imaplibc-client
rh-php56-php-recoderecode
Software Collections packages that require the Optional channel in Red Hat Enterprise Linux 7 are listed in the table below.
Expand
Table 2.2. Packages Requiring Enabling of the Optional Channel in Red Hat Enterprise Linux 7
Package from a Software CollectionRequired Package from the Optional Channel
devassist09-devassistantpython-jinja2
devtoolset-3-buildscl-utils-build
devtoolset-3-dyninst-testsuiteglibc-static
devtoolset-3-easymockcglib, objectweb-asm
devtoolset-3-eclipse-platformsac
devtoolset-3-gcc-plugin-devellibmpc-devel
devtoolset-3-icu4j-javadocjava-1.7.0-openjdk-javadoc
devtoolset-3-jschjzlib
devtoolset-3-lucene-replicatorjetty-continuation, jetty-http, jetty-io, jetty-jmx, jetty-security, jetty-server, jetty-servlet, jetty-util
devtoolset-3-lucene-solr-grandparentaether-api, aether-connector-wagon, aether-impl, aether-spi, aether-util, aopalliance, apache-commons-compress, apache-commons-net, apache-parent, apache-resource-bundles, aqute-bndlib, bsf, bsh, buildnumber-maven-plugin, cdi-api, cglib, felix-bundlerepository, felix-framework, felix-osgi-compendium, felix-osgi-core, felix-osgi-foundation, felix-osgi-obr, felix-shell, felix-utils, google-guice, guava, jboss-ejb-3.1-api, jboss-jaxrpc-1.1-api, jboss-servlet-3.0-api, jsch, jsoup, jzlib, kxml, maven, maven-archiver, maven-artifact, maven-artifact-manager, maven-artifact-resolver, maven-dependency-tree, maven-enforcer-api, maven-enforcer-plugin, maven-enforcer-rules, maven-file-management, maven-filtering, maven-model, maven-monitor, maven-plugin-bundle, maven-plugin-registry, maven-profile, maven-project, maven-scm, maven-settings, maven-shared-io, maven-wagon, modello, nekohtml, objectweb-asm, plexus-archiver, plexus-build-api, plexus-cipher, plexus-classworlds, plexus-compiler, plexus-i18n, plexus-interpolation, plexus-io, plexus-resources, plexus-sec-dispatcher, plexus-utils, plexus-velocity, sisu-inject-bean, sisu-inject-plexus, woodstox-core, xbean, xz-java
devtoolset-3-mockitocglib, objectweb-asm
devtoolset-3-tika-parsers-epubapache-commons-compress, xz-java
git19-git-cvscvsps
git19-perl-Git-SVNsubversion-perl
httpd24-mod_ldapapr-util-ldap
php54-php-pspellaspell
php55-php-pspellaspell
python27-python-debugscl-utils-build, tix
python27-python-develscl-utils-build
python27-tkintertix
rh-perl520-perl-Pod-Perldocgroff
rh-php56-php-pspellaspell
rh-python34-python-develscl-utils-build
rh-python34-python-sphinxtexlive-threeparttable, texlive-wrapfig
Note that packages from the Optional channel are not supported. For details, see the Knowledgebase article https://access.redhat.com/articles/1150793.

2.2. Installing Red Hat Software Collections
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Red Hat Software Collections is distributed as a collection of RPM packages that can be installed, updated, and uninstalled by using the standard package management tools included in Red Hat Enterprise Linux. Note that a valid subscription is required to install Red Hat Software Collections on your system. For detailed instructions on how to associate your system with an appropriate subscription and get access to Red Hat Software Collections, see Section 2.1, “Getting Access to Red Hat Software Collections”.
Use of Red Hat Software Collections 2.0 requires the removal of any earlier pre-release versions, including Beta releases. If you have installed any previous version of Red Hat Software Collections 2.0, uninstall it from your system and install the new version as described in the Section 2.3, “Uninstalling Red Hat Software Collections” and Section 2.2.1, “Installing Individual Software Collections” sections.
The in-place upgrade from Red Hat Enterprise Linux 6 to Red Hat Enterprise Linux 7 is not supported by Red Hat Software Collections. As a consequence, the installed Software Collections might not work correctly after the upgrade. If you want to upgrade from Red Hat Enterprise Linux 6 to Red Hat Enterprise Linux 7, it is strongly recommended to remove all Red Hat Software Collections packages, perform the in-place upgrade, update the Red Hat Software Collections repository, and install the Software Collections packages again. It is advisable to back up all data before upgrading.

2.2.1. Installing Individual Software Collections
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To install any of the Software Collections that are listed in Table 1.1, “Red Hat Software Collections 2.0 Components”, install the corresponding meta package by typing the following at a shell prompt as root: 
yum install software_collection...
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Replace software_collection with a space-separated list of Software Collections you want to install. For example, to install php54 and rh-mariadb100, type as root: 
~]# yum install php54 rh-mariadb100
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This installs the main meta package for the selected Software Collection and a set of required packages as its dependencies. For information on how to install additional packages such as additional modules, see Section 2.2.2, “Installing Optional Packages”.

2.2.2. Installing Optional Packages
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Each component of Red Hat Software Collections is distributed with a number of optional packages that are not installed by default. To list all packages that are part of a certain Software Collection but are not installed on your system, type the following at a shell prompt: 
yum list available software_collection-\*
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To install any of these optional packages, type as root: 
yum install package_name...
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Replace package_name with a space-separated list of packages that you want to install. For example, to install the rh-perl520-perl-CPAN and rh-perl520-perl-Archive-Tar, type: 
~]# yum install rh-perl520-perl-CPAN rh-perl520-perl-Archive-Tar
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2.2.3. Installing Debugging Information
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To install debugging information for any of the Red Hat Software Collections packages, make sure that the yum-utils package is installed and type the following command as root: 
debuginfo-install package_name
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For example, to install debugging information for the rh-ruby22-ruby package, type: 
~]# debuginfo-install rh-ruby22-ruby
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Note that in order to use this command, you need to have access to the repository with these packages. If your system is registered with Red Hat Subscription Management, enable the rhel-variant-rhscl-6-debug-rpms or rhel-variant-rhscl-7-debug-rpms repository as described in Section 2.1.1, “Using Red Hat Subscription Management”. If your system is registered with RHN Classic, subscribe the system to the rhel-x86_64-variant-6-rhscl-1-debuginfo or rhel-x86_64-variant-7-rhscl-1-debuginfo channel as described in Section 2.1.2, “Using RHN Classic”. For more information on how to get access to debuginfo packages, see https://access.redhat.com/solutions/9907.

2.3. Uninstalling Red Hat Software Collections
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To uninstall any of the Software Collections components, type the following at a shell prompt as root: 
yum remove software_collection\*
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Replace software_collection with the Software Collection component you want to uninstall.
Note that uninstallation of the packages provided by Red Hat Software Collections does not affect the Red Hat Enterprise Linux system versions of these tools.

2.4. Rebuilding Red Hat Software Collections
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<collection>-build packages are not provided by default. If you wish to rebuild a collection and do not want or cannot use the rpmbuild --define 'scl foo' command, you first need to rebuild the metapackage, which provides the <collection>-build package.
Note that existing collections should not be rebuilt with different content. To add new packages into an existing collection, you need to create a new collection containing the new packages and make it dependent on packages from the original collection. The original collection has to be used without changes.
For detailed information on building Software Collections, refer to the Red Hat Software Collections Packaging Guide.

Chapter 3. Usage
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This chapter describes the necessary steps for rebuilding and using Red Hat Software Collections 2.0, and deploying applications that use Red Hat Software Collections.

3.1. Using Red Hat Software Collections
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To run an executable from a particular Software Collection, type the following command at a shell prompt: 
scl enable software_collection... 'command...'
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Or, alternatively, use the following command: 
scl enable software_collection... -- command...
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Replace software_collection with a space-separated list of Software Collections you want to use and command with the command you want to run. For example, to execute a Perl program stored in a file named hello.pl with the Perl interpreter from the perl516 Software Collection, type: 
~]$ scl enable perl516 'perl hello.pl'
Hello, World!
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You can execute any command using the scl utility, causing it to be run with the executables from a selected Software Collection in preference to their possible Red Hat Enterprise Linux system equivalents. For a complete list of Software Collections that are distributed with Red Hat Software Collections, see Table 1.1, “Red Hat Software Collections 2.0 Components”.
To start a new shell session with executables from a selected Software Collection in preference to their Red Hat Enterprise Linux equivalents, type the following at a shell prompt: 
scl enable software_collection... bash
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Replace software_collection with a space-separated list of Software Collections you want to use. For example, to start a new shell session with the python27 and postgresql92 Software Collections as default, type: 
~]$ scl enable python27 postgresql92 bash
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The list of Software Collections that are enabled in the current session is stored in the $X_SCLS environment variable, for instance: 
~]$ echo $X_SCLS
python27 postgresql92
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For a complete list of Software Collections that are distributed with Red Hat Software Collections, see Table 1.1, “Red Hat Software Collections 2.0 Components”.
Software Collections that include system services install corresponding init scripts in the /etc/rc.d/init.d/ directory. To start such a service in the current session, type the following at a shell prompt as root: 
service software_collection-service_name start
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Replace software_collection with the name of the Software Collection and service_name with the name of the service you want to start. To configure this service to start automatically at boot time, type the following command as root: 
chkconfig software_collection-service_name on
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For example, to start the postgresql service from the postgresql92 Software Collection and enable it in runlevels 2, 3, 4, and 5, type as root: 
~]# service postgresql92-postgresql start
Starting postgresql92-postgresql service:                  [  OK  ]
~]# chkconfig postgresql92-postgresql on
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For more information on how to manage system services in Red Hat Enterprise Linux 6, refer to the Red Hat Enterprise Linux 6 Deployment Guide. For a complete list of Software Collections that are distributed with Red Hat Software Collections, see Table 1.1, “Red Hat Software Collections 2.0 Components”.
Every Software Collection contains a general manual page that describes the content of this component. Each manual page has the same name as the component and it is located in the/opt/rh directory.
To read a manual page for a Software Collection, type the following command: 
scl enable software_collection 'man software_collection'
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Replace software_collection with the particular Red Hat Software Collections component. For example, to display the manual page for mariadb55, type: 
~]$ scl enable mariadb55 "man mariadb55"
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In general, you can use one of the following two approaches to deploy an application that depends on a component from Red Hat Software Collections in production:
  • Install all required Software Collections and packages manually and then deploy your application, or
  • Create a new Software Collection for your application and specify all required Software Collections and other packages as dependencies.
For more information on how to manually install individual Red Hat Software Collections components, see Section 2.2, “Installing Red Hat Software Collections”. For further details on how to use Red Hat Software Collections, see Section 3.1, “Using Red Hat Software Collections”. For a detailed explanation of how to create a custom Software Collection or extend an existing one, read the Red Hat Software Collections Packaging Guide.
Red Hat Software Collections 2.0 is shipped with Dockerfiles for the following Software Collections:
  • httpd24
  • mariadb55
  • mongodb24
  • mysql55
  • nginx16
  • nodejs010
  • perl516
  • php54
  • php55
  • postgresql92
  • python27
  • python33
  • rh-mariadb100
  • rh-mongodb26
  • rh-mysql56
  • rh-passenger40
  • rh-perl520
  • rh-php56
  • rh-postgresql94
  • rh-python34
  • rh-ror41
  • rh-ruby22
  • ror40
  • ruby193
  • ruby200
The Dockerfiles are included in the rhscl-dockerfiles package distributed with Red Hat Software Collections. Dockerfiles are text files that define how a Docker image is created.

Note

The docker package, which contains the Docker daemon, command line tool, and other necessary components for building and using docker-formatted container images, is currently only available for the Server variant of the Red Hat Enterprise Linux 7 product. Red Hat Software Collections Dockerfiles are distributed for Red Hat Enterprise Linux 6 as well, but the images built using them can only be deployed on Red Hat Enterprise Linux 7 Server.
Each Dockerfile creates a minimal Docker image from Red Hat Enterprise Linux 6 or Red Hat Enterprise Linux 7 plus the Software Collection. Each Dockerfile will create an image which:
  • Installs the basic set of packages from each Software Collection,
  • Exposes some TCP ports; for example, port 80 and 443 for the httpd24 collection.
The Dockerfiles are provided as examples, using which customers can build more complex containers.
Dockerfiles are available also for previously released Software Collections. For detailed information about them, refer to the Red Hat Software Collections documentation and the Red Hat Software Collections Product Life Cycle document.

3.4.1. Installation and Usage
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To install the rhscl-dockerfiles package, type the following command as root: 
yum install rhscl-dockerfiles
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Use these Dockerfiles to create Docker images for the covered Software Collections.
For more information about building an image from a Dockerfile, see the Get Started with Docker Formatted Container Images on Red Hat Systems Knowledgebase article, or particularly the Building an Image from a Dockerfile section.
You can use a Red Hat Software Collections Docker image as a base image and create your own containerized Software Collection on top of it as a separate image.
For more information about creating a new Docker image, see the Creating Docker Images section in the relevant Knowledgebase article.
This chapter is focused on the specifics of certain Software Collections and provides additional details concerning these components.

4.1. Red Hat Developer Toolset
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Red Hat Developer Toolset is designed for developers working on the Red Hat Enterprise Linux platform. Red Hat Developer Toolset provides current versions of the GNU Compiler Collection, GNU Debugger, Eclipse development platform, and other development, debugging, and performance monitoring tools. Similarly to other Software Collections, an additional set of tools is installed into the /opt/ directory. These tools are enabled by the user on demand using the supplied scl utility. Similarly to other Software Collections, these do not replace the Red Hat Enterprise Linux system versions of these tools, nor will they be used in preference to those system versions unless explicitly invoked using the scl utility.
For a list of features, refer to the Main Features section of the Red Hat Developer Toolset Release Notes.
For a complete list of components, see the Red Hat Developer Toolset Components table in the Red Hat Developer Toolset User Guide.
Note that since Red Hat Software Collections 2.0, Red Hat Developer Toolset requires the rh-java-common Software Collection.

4.2. Thermostat 1
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The Thermostat Software Collection provides a monitoring and instrumentation tool for the OpenJDK HotSpot JVM, with support for monitoring multiple JVM instances. The system is made up of two components: an Agent, which collects data, and a Client, which allows users to visualize collected data. These components communicate via a storage layer: either directly via MongoDB or indirectly via a Web layer for increased security. A pluggable agent and GUI framework allows for collection and visualization of performance data beyond what is included out of the box.
To install the thermostat1 collection, type the following command as root: 
yum install thermostat1
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Note that since Red Hat Software Collections 2.0, the thermostat1 Software Collection requires the rh-java-common Collection.
To enable the thermostat1 collection, type the following command at a shell prompt: 
scl enable thermostat1 bash
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For more information, please refer to the Thermostat User Guide. In order to deploy Thermostat securely, see the Configuration and Administration Guide.

4.3. Ruby on Rails 4.1
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This Software Collection adds the rh-ruby22 package together with the rh-ror41 package. The Ruby on Rails Collection can be enabled by the following command, which will automatically enable rh-ruby22: 
scl enable rh-ror41 bash
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These two collections are supported together.

4.4. MongoDB 2.6
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To install the rh-mongodb26 collection, type the following command as root: 
yum install rh-mongodb26
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Note that since Red Hat Software Collections 2.0, the rh-mongodb26 Software Collection requires the rh-java-common Collection.
To run the MongoDB shell utility, type the following command: 
scl enable rh-mongodb26 'mongo'
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If you are using Red Hat Enterprise Linux 6, the following instructions apply to your system.
To start the MongoDB daemon, type the following command as root: 
service rh-mongodb26-mongod start
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To start the MongoDB daemon on boot, type this command as root: 
chkconfig rh-mongodb26-mongod on
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To start the MongoDB sharding server, type this command as root: 
service rh-mongodb26-mongos start
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To start the MongoDB sharding server on boot, type the following command as root: 
chkconfig rh-mongodb26-mongos on
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Note that the MongoDB sharding server does not work unless the user starts at least one configuration server and specifies it in the mongos.conf file.
When using Red Hat Enterprise Linux 7, the following commands are applicable.
To start the MongoDB daemon, type the following command as root: 
systemctl start rh-mongodb26-mongod.service
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To start the MongoDB daemon on boot, type this command as root: 
systemctl enable rh-mongodb26-mongod.service
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To start the MongoDB sharding server, type the following command as root: 
systemctl start rh-mongodb26-mongos.service
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To start the MongoDB sharding server on boot, type this command as root: 
systemctl enable rh-mongodb26-mongos.service
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Note that the MongoDB sharding server does not work unless the user starts at least one configuration server and specifies it in the mongos.conf file.

4.5. DevAssistant
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DevAssistant is a tool designed to assist developers with creating and setting up basic projects in various programming languages, installing dependencies, setting up a development environment, and working with source control. The devassist09 Software Collection supports several programming languages, namely C, C++, Java, and Python. Additionally, DevAssistant is able to support working with any other language, framework, or tool due to its modular architecture.
DevAssistant is a framework that runs plug-ins called assistants. Each assistant can have several subassistants.

4.5.1. Getting Started with DevAssistant
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To install the devassist09 Software Collection, type the following command as root: 
yum install devassist09
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To enable this collection, type the following command at a shell prompt: 
scl enable devassist09 bash
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To get help for DevAssistant, use the following command: 
devassistant --help
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or the shorter variant of the same command: 
da -h
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It is advisable to use the --help option on each level to list your possible next steps, until you reach the level of an executable subassistant (see Example 4.1, “Creating a New Python Library Project”).
To access the graphical user interface, type this command at a shell prompt: 
devassistant-gui
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or the shortened variant: 
da-gui
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Please note that the GUI is available only if you install the devassist09 Software Collection on Red Hat Enterprise Linux 7. The functionalities and procedures are the same as when using the command line interface.
Note that the devassistant and da commands are equal. Further in the text, we will use only the shorter variant, the da command.

4.5.2. Running Assistants
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DevAssistant provides the following functionalities: create, modify, prepare, and task. To run an assistant, use the following command: 
da [--debug] {create,modify,prepare,task} [assistant [arguments]] ...
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The four basic commands and descriptions related to these functionalities are listed in the following table:
Expand
Table 4.1. Functionalities of DevAssistant
Command Shortened Command Description
da create da crt Creating a new project from scratch
da modify da mod Working with an existing project
da prepare da prep Preparing a development environment for an upstream project
da task Performing a custom task not related to a specific project
The devassist09 Software Collection does not include any assistants for the modify, prepare, and task functionalities. These categories are available for users who want to create their own assistants.

4.5.3. Creating Projects with DevAssistant
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The devassist09 Software Collection includes the following assistants for creating projects:
Expand
Table 4.2. Assistants for Creating Projects
Assistant Subassistant Description
c app An application in C
lib A dynamically linked library in C
cpp app An application in C++
lib A dynamically linked library in C++
java maven A simple project using Maven
python lib A simple library for Python
The following example demonstrates creating a new Python library project by following instructions displayed by the --help option.

Example 4.1. Creating a New Python Library Project

To create a new Python library project, complete the following steps:
  1. Enable the devassist09 Software Collection by running this command: 
    ~]$ scl enable devassist09 bash
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  2. Display help about DevAssistant by using the --help option: 
    ~]$ da --help
You can either run assistants with:
da [--debug] {create,modify,prepare,task} [ASSISTANT [ARGUMENTS]] ...

Where:
create   used for creating new projects
modify   used for working with existing projects
prepare  used for preparing environment for upstream projects
task     used for performing custom tasks not related to a specific project
You can shorten "create" to "crt", "modify" to "mod" and "prepare" to "prep".

Or you can run a custom action:
da [--debug] [ACTION] [ARGUMENTS]

Available actions:
help     Print detailed help
version  Print version
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  3. List the possible next steps for creating a project by typing: 
    ~]$ da create --help
usage:  create [-h] [--deps-only] {c,cpp,java,python} ...

Kickstart new projects easily with DevAssistant.

optional arguments:
  -h, --help           show this help message and exit
  --deps-only          Only install dependencies

subassistants:
  Following subassistants will help you with setting up your project.

  {c,cpp,java,python}
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  4. Display help on the python assistant by typing at a shell prompt: 
    ~]$ da create python --help
usage: create python [-h] {lib} ...

This is a base Python assistant, you have to select a subassistant.

optional arguments:
  -h, --help  show this help message and exit

subassistants:
  Following subassistants will help you with setting up your project.

  {lib}
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  5. List your choices for the only python subassistant, lib, by running this command: 
    ~]$ da create python lib --help
usage: create python lib [-h] [-e [ECLIPSE]] -n NAME

Scaffolds a simple Python library project.

optional arguments:
  -h, --help            show this help message and exit
  -e [ECLIPSE], --eclipse [ECLIPSE]
                        Configure as Eclipse project (uses ~/workspace or
                        specified directory)
  -n NAME, --name NAME  Name of project to create
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  6. Run the assistant to create your new Python library project named mypythonlib by using the following command: 
    ~]$ da create python lib -n mypythonlib
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To get more information about the upstream version of DevAssistant, refer to the DevAssistant User Documentation. Please note that though the basic concept of the upstream application is the same as in the devassist09 Software Collection, individual plug-ins and their functionalities might differ.

4.5.4. Backward Compatibility in DevAssistant
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The updated version of DevAssistant can cause incompatibility in assistants that have not been provided by the devassist09-devassistant-assistants-dts package, that is, in your own assistants.
  • Since DevAssistant 0.9.3, the variable names in the assistant files are no longer derived from the argument flags but from the argument names. In the following example, the $foo variable is initialized instead of the $bar variable: 
    args:
   foo:
     ...
     flags: [-b, --bar]
     ...
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  • Unknown attributes in the arguments section in the assistant file are no longer allowed. Since DevAssistant 0.9.3, an error message is returned in the following example because the unknown_attribute is not known to the parser: 
    args:
   foo:
     ...
     unknown_attribute: foo bar baz
     ...
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4.6. Maven
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The maven30 Software Collection provides a software project management and comprehension tool. Based on the concept of a project object model (POM), Maven can manage a project's build, reporting, and documentation from a central piece of information.
To install the maven30 Collection, type the following command as root: 
yum install maven30
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Note that since Red Hat Software Collections 2.0, the maven30 Software Collection requires the rh-java-common Collection.
To enable this collection, type the following command at a shell prompt: 
scl enable maven30 bash
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Global Maven settings, such as remote repositories or mirrors, can be customized by editing the /opt/rh/maven30/root/etc/maven/settings.xml file.
For more information about using Maven, refer to the Maven documentation. To find documentation regarding individual plug-ins, please see the index of plug-ins.

4.7. Passenger
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The rh-passenger40 Software Collection provides Phusion Passenger, a web and application server designed to be fast, robust and lightweight.
The rh-passenger40 Collection supports multiple versions of Ruby, particularly the ruby193, ruby200, and rh-ruby22 Software Collections together with Ruby on Rails using the ror40 or rh-ror41 Collections. Prior to using Passenger with any of the Ruby Software Collections, install the corresponding package from the rh-passenger40 Collection: the rh-passenger-ruby193, rh-passenger-ruby200, or rh-passenger-ruby22 package.
The rh-passenger40 Software Collection can also be used with Apache httpd from the httpd24 Software Collection. To do so, install the rh-passenger40-mod_passenger package. Refer to the default configuration file /opt/rh/httpd24/root/etc/httpd/conf.d/passenger.conf for an example of Apache httpd configuration, which shows how to use multiple Ruby versions in a single Apache httpd instance.
Additionally, the rh-passenger40 Software Collection can be used with the nginx 1.6 web server from the nginx16 Software Collection. To use nginx 1.6 with rh-passenger40, you can run Passenger in Standalone mode using the following command in the web appplication's directory: 
scl enable nginx16 rh-passenger40 'passenger start'
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Alternatively, edit the nginx16 configuration files as described in the upstream Passenger documentation.

Chapter 5. Migration
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This chapter provides information on migrating to versions of components included in Red Hat Software Collections 2.0.

5.1. Migrating to MariaDB 10.0
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Red Hat Enterprise Linux 6 contains MySQL 5.1 as the default MySQL implementation. Red Hat Enterprise Linux 7 includes MariaDB 5.5 as the default MySQL implementation. MariaDB is a community-developed drop-in replacement for MySQL. In addition to these basic versions, MariaDB 5.5 has been available for Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7 as a Software Collection since Red Hat Software Collections 1.0.
The rh-mariadb100 Software Collection available for both Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7 does not conflict with the mysql or mariadb packages from the core systems, so it is possible to install the rh-mariadb100 Software Collection together with the mysql or mariadb packages. It is also possible to run both versions at the same time, however, the port number and the socket in the my.cnf files need to be changed to prevent these specific resources from conflicting.
Note that it is possible to upgrade to MariaDB 10.0 only from MariaDB 5.5 or MySQL 5.5. If you need to upgrade from an earlier version, upgrade to MariaDB 5.5 or MySQL 5.5 first. Instructions how to upgrade to MariaDB 5.5 or MySQL 5.5 are available in the Red Hat Software Collections 1.2 Release Notes.
MariaDB 10.0 is built on the MariaDB 5.5 series with backported features from MySQL 5.6 and with entirely new features unavailable elsewhere. The rh-mariadb100 Software Collection introduces the following notable changes:
  • The service has been renamed to rh-mariadb100-mariadb in both Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7
  • The test database is no longer created by default
  • Configuration files for the rh-mariadb100 Software Collection are the /etc/opt/rh/rh-mariadb100/my.cnf file and in the /etc/opt/rh/rh-mariadb100/my.cnf.d/ directory
  • Variable files including the database files for the rh-mariadb100 Software Collection are located in the /var/opt/rh/rh-mariadb100/lib/ directory
  • The log file for the MariaDB daemon is /var/opt/rh/rh-mariadb100/log/mariadb/mariadb.log
  • The pid file for the daemon is /var/run/rh-mariadb100-mariadb/mariadb.pid
Note that the rh-mariadb100 Software Collection supports neither mounting over NFS nor dynamical registering using the scl register command.
For detailed changes, refer to the MariaDB documentation.
If you are going to upgrade from MySQL, refer to the articles about compatibility and features differences.

Important

Prior to upgrading, back-up all your data, including any MariaDB or MySQL databases.
Upgrading can be performed either by using the mysqldump and mysqlimport utilities or using an in-place upgrade.
  • In the former scenario, the whole dump of all databases from one database is generated and mysql is run with the dump file as an input using the mysqlimport or LOAD DATA INFILE SQL command within the other database. At the same time, the appropriate daemons have to be running during both dumping and restoring. You can use the --all-databases option in the mysqldump call to include all databases in the dump. The --routines, --triggers, and --events options can also be used if needed.
  • During the in-place upgrade, the data files are copied from one database directory to another database directory. The daemons must not be running at the time of copying. Set appropriate permissions and SELinux context for the copied files.
After upgrading, start the server and run the mysql_upgrade command. Running mysql_upgrade is necessary to check and repair internal tables.
In case the root user has a non-empty password defined (it should have a password defined), it is necessary to call the mysql_upgrade utility with the -p option and specify the password.
Service names and paths bellow depend on which version you are upgrading from.

Example 5.1. Dump and Restore Upgrade

  1. Create a backup from MariaDB.
    • If you are upgrading from MariaDB 5.5 from base Red Hat Enterprise Linux 7: 
      ~]# service mariadb start
Starting mariadb:                                          [  OK  ]
~]# mysqldump --all-databases --routines --events > dump.sql
~]# service mariadb stop
Stopping mariadb:                                          [  OK  ]
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    • If you are upgrading from the mariadb55 Software Collection in Red Hat Enterprise Linux 6: 
      ~]# service mariadb55-mysqld start
Starting mariadb55-mysqld:                                 [  OK  ]
~]# scl enable mariadb55 -- mysqldump --all-databases --routines --events > dump.sql
~]# service mariadb55-mysqld stop
Stopping mariadb55-mysqld:                                 [  OK  ]
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    • For upgrading from the mariadb55 Software Collection in Red Hat Enterprise Linux 7, use mariadb55-mariadb as the service name.
    • For upgrading from the mysql55 Software Collection, use mysql55-mysqld as the service name.
  2. Import the dumped database into the rh-mariadb100 Software Collection: 
    ~]# service rh-mariadb100-mariadb start
Starting rh-mariadb100-mariadb:                            [  OK  ]
~]# scl enable rh-mariadb100 'mysql' < dump.sql
~]# scl enable rh-mariadb100 'mysql_upgrade -u root -p'
Enter password:
Looking for 'mysql' as: mysql
Looking for 'mysqlcheck' as: mysqlcheck
Running 'mysqlcheck with default connection arguments
Running 'mysqlcheck with default connection arguments
a.t1                                               OK
mysql.columns_priv                                 OK
<skipped tables list>
mysql.user                                         OK
Running 'mysql_fix_privilege_tables'...
OK
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Example 5.2. In-place Upgrade from MariaDB 5.5

If you are upgrading from MariaDB 5.5 from base Red Hat Enterprise Linux 7, perform the upgrade as shown in the following example: 
~]# service mariadb stop
Stopping mariadb:                                          [  OK  ]
~]# service rh-mariadb100-mariadb stop
Stopping rh-mariadb100-mariadb:                            [  OK  ]
~]# rm -rf /var/opt/rh/rh-mariadb100/lib/mysql/
~]# cp -r /var/lib/mysql/ /var/opt/rh/rh-mariadb100/lib/
~]# chown -R mysql:mysql /var/opt/rh/rh-mariadb100/lib/mysql/
~]# restorecon -R /var/opt/rh/rh-mariadb100/lib/mysql/
~]# service rh-mariadb100-mariadb start
Starting rh-mariadb100-mariadb:                            [  OK  ]
~]# scl enable rh-mariadb100 'mysql_upgrade -u root -p'
Enter password:
Looking for 'mysql' as: mysql
Looking for 'mysqlcheck' as: mysqlcheck
Running 'mysqlcheck with default connection arguments
Running 'mysqlcheck with default connection arguments
a.t1                                               OK
mysql.columns_priv                                 OK
<skipped tables list>
mysql.user                                         OK
Running 'mysql_fix_privilege_tables'...
OK
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For upgrading from the mariadb55 Software Collection{;, use the /opt/rh/mariadb55/root/var/lib/mysql/ as a source when copying the data.
For upgrading from the mysql55 Software Collection, use the /opt/rh/mysql55/root/var/lib/mysql/ as a source when copying the data.
For further details, refer to the articles about upgrading from MariaDB 5.5 or upgrading from MySQL 5.5.

5.2. Migrating to MongoDB 2.6
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MongoDB 2.4 has been available since Red Hat Software Collections 1.1 as the mongodb24 Software Collection. Red Hat Software Collections 2.0 is shipped with MongoDB 2.6 provided by the rh-mongodb26 Software Collection.
General Changes
The rh-mongodb26 Software Collection introduces several general changes listed below.
  • Service files have been renamed:
    • The /etc/rc.d/init.d/mongodb24-mongodb service file for the MongoDB daemon has been renamed to /etc/rc.d/init.d/rh-mongodb26-mongod
    • The /etc/rc.d/init.d/mongodb24-mongodb-shard service file for the MongoDB sharding server has been renamed to /etc/rc.d/init.d/rh-mongodb26-mongos
  • Configuration and system configuration files have been renamed:
    • The mongod daemon uses the /etc/opt/rh/rh-mongodb26/mongod.conf and /etc/opt/rh/rh-mongodb26/sysconfig/mongod configuration files
    • The mongos sharding server uses the /etc/opt/rh/rh-mongodb26/mongos.conf and /etc/opt/rh/rh-mongodb26/sysconfig/mongos configuration files
  • The log files have been relocated:
    • The mongod daemon now writes log to the /var/opt/rh/rh-mongodb26/log/mongodb/mongod.log file
    • The mongos sharding server writes log to the /var/opt/rh/rh-mongodb26/log/mongodb/mongos.log file
  • The default mongos port number has been changed from 27019 to 27017
  • The rh-mongodb26-mongodb-test package, which contains the MongoDB test suite, has been added. For more information about usage, install this package and read the /opt/rh/rh-mongodb26/root/usr/share/mongodb-test/README file.
  • The rh-mongodb26 Software Collection supports neither mounting over NFS nor dynamical registering using the scl register command.
Compatibility Changes
MongoDB 2.6 includes various minor changes that can affect compatibility with previous versions of MongoDB. For a brief list of compatibility changes in MongoDB 2.6, refer to the Knowledgebase article on the Red Hat Customer Portal. For details on compatibility changes, see the MongoDB documentation.
Authentication Changes
MongoDB 2.6 authorization model introduces changes in the way MongoDB stores and manages user privilege information:
  • MongoDB 2.6 requires at least one user in the admin database with the userAdminAnyDatabase role. Make sure that this user exists before you upgrade.
  • You will not be able to create or modify users or create user-defined roles in MongoDB versions that use previous authorization models.
For details on authentication changes, see the MongoDB documentation.
Note that once upgraded to MongoDB 2.6, you cannot downgrade to any version earlier than MongoDB 2.4. If you created text or 2dsphere indexes while running MongoDB 2.6, you can downgrade only to MongoDB 2.4.10 or later versions.

Important

Before migrating from the mongodb24 to the rh-mongodb26 Software Collection, back up all your data, including any MongoDB databases, which are by default stored in the /opt/rh/mongodb24/root/var/lib/mongodb/ directory.
To upgrade to the rh-mongodb26 Software Collection, perform the following steps as root.
  1. Install the MongoDB server from the rh-mongodb26 Software Collection: 
    yum install rh-mongodb26
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  2. Stop the mongodb24 server in Red Hat Enterprise Linux 6: 
    service mongodb24-mongodb stop
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    Use the systemctl stop mongodb24-mongodb.service command instead if you are using Red Hat Enterprise Linux 7.
  3. Copy your data into the new location: 
    cp -a /opt/rh/mongodb24/root/var/lib/mongodb/* /var/opt/rh/rh-mongodb26/lib/mongodb
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  4. Change the dbpath variable in the /opt/rh/mongodb24/root/etc/mongodb.conf file to /var/opt/rh/rh-mongodb26/lib/mongodb/.
  5. Start the mongodb24 server in Red Hat Enterprise Linux 6: 
    service mongodb24-mongodb start
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    Use the systemctl start mongodb24-mongodb.service command if instead you are using Red Hat Enterprise Linux 7.
  6. Install the mongo shell from the rh-mongodb26 Software Collection: 
    yum install rh-mongodb26-mongodb
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  7. Connect the mongo shell from the rh-mongodb26 Software Collection to your mongodb24 server (for example, running on localhost, port 27017; you do not need root privileges for this step): 
    scl enable rh-mongodb26 'mongo --host localhost --port 27017 admin'
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  8. In the mongo shell, run the db.upgradeCheckAllDBs() function to check your data set for compatibility: 
    db.upgradeCheckAllDBs()
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    See the MongoDB documentation for more information about the db.upgradeCheckAllDBs() function.
  9. Resolve all issues identified by db.upgradeCheckAllDBs() and compatibility issues mentioned above that affect your application.
  10. Stop the mongodb24 server in Red Hat Enterprise Linux 6: 
    service mongodb24-mongodb stop
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    Use the systemctl stop mongodb24-mongodb.service command instead if you are using Red Hat Enterprise Linux 7.
  11. Make the mongodb24 Software Collection runnable after the upgrade by changing the dbpath variable back to the previous value (/opt/rh/mongodb24/root/var/lib/mongodb/ by default) in the /opt/rh/mongodb24/root/etc/mongodb.conf file.
  12. Configure the rh-mongodb26-mongod daemon in the /etc/opt/rh/rh-mongodb26/mongod.conf configuration file.
  13. Start the MongoDB server from the rh-mongodb26 Collection in Red Hat Enterprise Linux 6: 
    service rh-mongodb26-mongod start
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    Use the systemctl start rh-mongodb26-mongod.service instead if you are using Red Hat Enterprise Linux 7.
  14. Upgrade the authorization model as described in the MongoDB documentation. Note that it is recommended to run your MongoDB deployment for a day or two before you upgrade the user authorization model because downgrades are more difficult after the user authorization model has been upgraded. Before you upgrade the authorization model, you will not be able to create or modify users or to use user-defined roles.
For detailed information about upgrading, refer to the MongoDB documentation, or particularly about upgrading a Replica Set or a Sharded Cluster.

5.3. Migrating to MySQL 5.6
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Red Hat Enterprise Linux 6 contains MySQL 5.1 as the default MySQL implementation. Red Hat Enterprise Linux 7 includes MariaDB 5.5 as the default MySQL implementation. In addition to these basic versions, MySQL 5.5 has been available as a Software Collection for Red Hat Enterprise Linux 6 since Red Hat Software Collections 1.0 and for Red Hat Enterprise Linux 7 since Red Hat Software Collections 1.1.
The rh-mysql56 Software Collection available for both Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7 does not conflict with the mysql or mariadb packages from the core systems, so it is possible to install the rh-mysql56 Software Collection together with the mysql or mariadb packages. It is also possible to run both versions at the same time, however, the port number and the socket in the my.cnf files need to be changed to prevent these specific resources from conflicting.
Note that it is possible to upgrade to MySQL 5.6 only from MySQL 5.5. If you need to upgrade from an earlier version, upgrade to MySQL 5.5 first. Instructions how to upgrade to MySQL 5.5 are available in the Red Hat Software Collections 1.2 Release Notes.
The rh-mysql56 Software Collection introduces the following notable changes:
  • The service has been renamed to rh-mysql56-mysqld in both Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7
  • The test database is no longer created by default
  • Configuration files for the rh-mysql56 Software Collection are the /etc/opt/rh/rh-mysql56/my.cnf file and in the /etc/opt/rh/rh-mysql56/my.cnf.d/ directory
  • Variable files including the database files for the rh-mysql56 Software Collection are located in the /var/opt/rh/rh-mysql56/lib/ directory
  • The log file for the MySQL daemon is /var/opt/rh/rh-mysql56/log/mysql/mysqld.log
  • The pid file for the daemon is /var/run/rh-mysql56-mysqld/mysqld.pid
Note that the rh-mysql56 Software Collection supports neither mounting over NFS nor dynamical registering using the scl register command.
For detailed changes, refer to the MySQL documentation.

Important

Prior to upgrading, back-up all your data, including any MySQL databases.
Upgrading can be performed either by using the mysqldump and mysqlimport utilities or using an in-place upgrade.
  • In the former scenario, the whole dump of all databases from one database is generated and mysql is run with the dump file as an input using the mysqlimport or LOAD DATA INFILE SQL command within the other database. At the same time, the appropriate daemons have to be running during both dumping and restoring. You can use the --all-databases option in the mysqldump call to include all databases in the dump. The --routines, --triggers, and --events options can also be used if needed.
  • During the in-place upgrade, the data files are copied from one database directory to another database directory. The daemons must not be running at the time of copying. Set appropriate permissions and SELinux context for the copied files.
After upgrading, start the server and run the mysql_upgrade command. Running mysql_upgrade is necessary to check and repair internal tables.
In case the root user has a non-empty password defined (it should have a password defined), it is necessary to call the mysql_upgrade utility with the -p option and specify the password.
Service names and paths bellow depend on which version you are upgrading from.

Example 5.3. Dump and Restore Upgrade

  1. Create a backup from the mysql55 Software Collection: 
    ~]# service mysql55-mysqld start
Starting mysql55-mysqld:                                   [  OK  ]
~]# scl enable mysql55 -- mysqldump --all-databases --routines --events > dump.sql
~]# service mysql55-mysqld stop
Stopping mysql55-mysqld:                                   [  OK  ]
    Copy to Clipboard Toggle word wrap
    For upgrading from the mariadb55 Software Collection in Red Hat Enterprise Linux 6, use mariadb55-mysqld as the service name.
    For upgrading from the mariadb55 Software Collection in Red Hat Enterprise Linux 7, use mariadb55-mariadb as the service name.
    For upgrading from MariaDB 5.5 from base Red Hat Enterprise Linux 7, use mariadb as the service name and do not use scl enable mysql55 -- when creating the dump.
  2. Import the dumped database into the rh-mysql56 Software Collection: 
    ~]# service rh-mysql56-mysqld start
Starting rh-mysql56-mysqld:                                [  OK  ]
~]# scl enable rh-mysql56 'mysql' < dump.sql
~]# scl enable rh-mysql56 'mysql_upgrade -u root -p'
Enter password:
Looking for 'mysql' as: mysql
Looking for 'mysqlcheck' as: mysqlcheck
Running 'mysqlcheck with default connection arguments
Running 'mysqlcheck with default connection arguments
a.t1                                               OK
mysql.columns_priv                                 OK
<skipped tables list>
mysql.user                                         OK
Running 'mysql_fix_privilege_tables'...
OK
    Copy to Clipboard Toggle word wrap

Example 5.4. In-place Upgrade from MySQL 5.5

If you are upgrading from the mysql55 Software Collection, perform the upgrade as shown in the following example: 
~]# service mysql55-mysqld stop
Stopping mysql55-mysqld                                    [  OK  ]
~]# service rh-mysql56-mysqld stop
Stopping rh-mysql56-mysqld:                                [  OK  ]
~]# rm -rf /var/opt/rh/rh-mysql56/lib/mysql/
~]# cp -r /opt/rh/mysql55/root/var/lib/mysql/ /var/opt/rh/rh-mysql56/lib/
~]# chown -R mysql:mysql /var/opt/rh/rh-mysql56/lib/mysql/
~]# restorecon -R /var/opt/rh/rh-mysql56/lib/mysql/
~]# service rh-mysql56-mysqld start
Starting rh-mysql56-mysqld:                                [  OK  ]
~]# scl enable rh-mysql56 'mysql_upgrade -u root -p'
Enter password:
Looking for 'mysql' as: mysql
Looking for 'mysqlcheck' as: mysqlcheck
Running 'mysqlcheck with default connection arguments
Running 'mysqlcheck with default connection arguments
a.t1                                               OK
mysql.columns_priv                                 OK
<skipped tables list>
mysql.user                                         OK
Running 'mysql_fix_privilege_tables'...
OK
Copy to Clipboard Toggle word wrap
For upgrading from the mariadb55 Software Collection, use the /opt/rh/mariadb55/root/var/lib/mysql/ as a source when copying the data.
For upgrading from MariaDB 5.5 from base Red Hat Enterprise Linux 7, use the /var/lib/mysql/ as a source when copying the data.
For more details about migration to MySQL 5.6, refer to the MySQL documentation.

5.4. Migrating to PostgreSQL 9.4
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Red Hat Software Collections 2.0 is distributed with PostgreSQL 9.4, which can be safely installed on the same machine in parallel with PostgreSQL 8.4 from Red Hat Enterprise Linux 6 or PostgreSQL 9.2 from Red Hat Enterprise Linux 7 or Red Hat Software Collections 1. It is also possible to run more than one version of PostgreSQL on a machine at the same time, but you need to use different ports or IP addresses and adjust SELinux policy.
The most notable changes between PostgreSQL 9.2 and PostgreSQL 9.4 are the following:
  • PostgreSQL 9.4 no longer includes native support for Kerberos authentication (for example, using the --with-krb5 option). As consequence, the krb_srvname option is not available anymore. The supported way to use Kerberos authentication is with Generic Security Services API (GSSAPI).
  • Since PostgreSQL 9.4, the replication_timeout configuration option has been split into the wal_receiver_timeout and wal_sender_timeout options.
  • The scl register rh-postgresql94 command is unsupported and the rh-postgresql94 Software Collection is not supported to run over NFS.
The following table provides an overview of different paths in a Red Hat Enterprise Linux system version of PostgreSQL (postgresql) and in the postgresql92 and rh-postgresql94 Software Collections. Note that the paths of PostgreSQL 8.4 distributed with Red Hat Enterprise Linux 6 and the system version of PostgreSQL 9.2 shipped with Red Hat Enterprise Linux 7 are the same.
Expand
Table 5.1. Diferences in the PostgreSQL paths
Contentpostgresqlpostgresql92rh-postgresql94
Executables/usr/bin//opt/rh/postgresql92/root/usr/bin//opt/rh/rh-postgresql94/root/usr/bin/
Libraries/usr/lib64//opt/rh/postgresql92/root/usr/lib64//opt/rh/rh-postgresql94/root/usr/lib64/
Documentation/usr/share/doc/postgresql/html//opt/rh/postgresql92/root/usr/share/doc/postgresql/html//opt/rh/rh-postgresql94/root/usr/share/doc/postgresql/html/
PDF documentation/usr/share/doc/postgresql-docs//opt/rh/postgresql92/root/usr/share/doc/postgresql-docs//opt/rh/rh-postgresql94/root/usr/share/doc/postgresql-docs/
Contrib documentation/usr/share/doc/postgresql-contrib//opt/rh/postgresql92/root/usr/share/doc/postgresql-contrib//opt/rh/rh-postgresql94/root/usr/share/doc/postgresql-contrib/
Sourcenot installednot installednot installed
Data/var/lib/pgsql/data//opt/rh/postgresql92/root/var/lib/pgsql/data//var/opt/rh/rh-postgresql94/lib/pgsql/data/
Backup area/var/lib/pgsql/backups//opt/rh/postgresql92/root/var/lib/pgsql/backups//var/opt/rh/rh-postgresql94/lib/pgsql/backups/
Templates/usr/share/pgsql//opt/rh/postgresql92/root/usr/share/pgsql//opt/rh/rh-postgresql94/root/usr/share/pgsql/
Procedural Languages/usr/lib64/pgsql//opt/rh/postgresql92/root/usr/lib64/pgsql//opt/rh/rh-postgresql94/root/usr/lib64/pgsql/
Development Headers/usr/include/pgsql//opt/rh/postgresql92/root/usr/include/pgsql//opt/rh/rh-postgresql94/root/usr/include/pgsql/
Other shared data/usr/share/pgsql//opt/rh/postgresql92/root/usr/share/pgsql//opt/rh/rh-postgresql94/root/usr/share/pgsql/
Regression tests/usr/lib64/pgsql/test/regress/ (in the -test package)/opt/rh/postgresql92/root/usr/lib64/pgsql/test/regress/ (in the -test package)/opt/rh/rh-postgresql94/root/usr/lib64/pgsql/test/regress/ (in the -test package)
For detailed changes, see the PostgreSQL 9.3 Release Notes and the PostgreSQL 9.4 Release Notes. For changes between PostgreSQL 8.4 and PostgreSQL 9.2, refer to the Red Hat Software Collections 1.2 Release Notes.
Red Hat Enterprise Linux 6 includes PostgreSQL 8.4, Red Hat Enterprise Linux 7 is distributed with PostgreSQL 9.2. To migrate your data from a Red Hat Enterprise Linux system version of PostgreSQL to the rh-postgresql94 Software Collection, you can either perform a fast upgrade using the pg_upgrade tool (recommended), or dump the database data into a text file with SQL commands and import it in the new database. Note that the second method is usually significantly slower and may require manual fixes; see the PostgreSQL documentation for more information about this upgrade method. The following procedures are applicable for both Red Hat Enterprise Linux 6 and Red Hat Enterprise Linux 7 system versions of PostgreSQL.

Important

Before migrating your data from a Red Hat Enterprise Linux system version of PostgreSQL to PostgreSQL 9.4, make sure that you back up all your data, including the PostgreSQL database files, which are by default located in the /var/lib/pgsql/data/ directory.

Procedure 5.1. Fast Upgrade Using the pg_upgrade Tool

To perform a fast upgrade of your PostgreSQL server, complete the following steps:
  1. Stop the old PostgreSQL server to ensure that the data is not in an inconsistent state. To do so, type the following at a shell prompt as root: 
    service postgresql stop
    Copy to Clipboard Toggle word wrap
    To verify that the server is not running, type: 
    service postgresql status
    Copy to Clipboard Toggle word wrap
  2. Verify that the old directory /var/lib/pgsql/data/ exists: 
    file /var/lib/pgsql/data/
    Copy to Clipboard Toggle word wrap
    and back up your data.
  3. Verify that the new data directory /var/opt/rh/rh-postgresql94/lib/pgsql/data/ does not exist: 
    file /var/opt/rh/rh-postgresql94/lib/pgsql/data/
    Copy to Clipboard Toggle word wrap
    If you are running a fresh installation of PostgreSQL 9.4, this directory should not be present in your system. If it is, back it up by running the following command as root: 
    mv /var/opt/rh/rh-postgresql94/lib/pgsql/data{,-scl-backup}
    Copy to Clipboard Toggle word wrap
  4. Upgrade the database data for the new server by running the following command as root: 
    scl enable rh-postgresql94 -- postgresql-setup --upgrade
    Copy to Clipboard Toggle word wrap
    Alternatively, you can use the /opt/rh/rh-postgresql94/root/usr/bin/postgresql-setup --upgrade command.
    Note that you can use the --upgrade-from option for upgrade from different versions of PostgreSQL. The list of possible upgrade scenarios is available using the --upgrade-ids option.
    It is recommended that you read the resulting /var/lib/pgsql/upgrade_rh-postgresql94-postgresql.log log file to find out if any problems occurred during the upgrade.
  5. Start the new server as root: 
    service rh-postgresql94-postgresql start
    Copy to Clipboard Toggle word wrap
    It is also advised that you run the analyze_new_cluster.sh script as follows: 
    su - postgres -c 'scl enable rh-postgresql94 ~/analyze_new_cluster.sh'
    Copy to Clipboard Toggle word wrap
  6. Optionally, you can configure the PostgreSQL 9.4 server to start automatically at boot time. To disable the old system PostgreSQL server, type the following command as root: 
    chkconfig postgresql off
    Copy to Clipboard Toggle word wrap
    To enable the PostgreSQL 9.4 server, type as root: 
    chkconfig rh-postgresql94-postgresql on
    Copy to Clipboard Toggle word wrap
  7. If your configuration differs from the default one, make sure to update configuration files, especially the /var/opt/rh/rh-postgresql94/lib/pgsql/data/pg_hba.conf configuration file. Otherwise only the postgres user will be allowed to access the database.

Procedure 5.2. Performing a Dump and Restore Upgrade

To perform a dump and restore upgrade of your PostgreSQL server, complete the following steps:
  1. Ensure that the old PostgreSQL server is running by typing the following at a shell prompt as root: 
    service postgresql start
    Copy to Clipboard Toggle word wrap
  2. Dump all data in the PostgreSQL database into a script file. As root, type: 
    su - postgres -c 'pg_dumpall > ~/pgdump_file.sql'
    Copy to Clipboard Toggle word wrap
  3. Stop the old server by running the following command as root: 
    service postgresql stop
    Copy to Clipboard Toggle word wrap
  4. Initialize the data directory for the new server as root: 
    scl enable rh-postgresql94-postgresql -- postgresql-setup --initdb
    Copy to Clipboard Toggle word wrap
  5. Start the new server as root: 
    service rh-postgresql94-postgresql start
    Copy to Clipboard Toggle word wrap
  6. Import data from the previously created SQL file: 
    su - postgres -c 'scl enable rh-postgresql94 "psql -f ~/pgdump_file.sql postgres"'
    Copy to Clipboard Toggle word wrap
  7. Optionally, you can configure the PostgreSQL 9.4 server to start automatically at boot time. To disable the old system PostgreSQL server, type the following command as root: 
    chkconfig postgresql off
    Copy to Clipboard Toggle word wrap
    To enable the PostgreSQL 9.4 server, type as root: 
    chkconfig rh-postgresql94-postgresql on
    Copy to Clipboard Toggle word wrap
  8. If your configuration differs from the default one, make sure to update configuration files, especially the /var/opt/rh/rh-postgresql94/lib/pgsql/data/pg_hba.conf configuration file. Otherwise only the postgres user will be allowed to access the database.
To migrate your data from the postgresql92 Software Collection to the rh-postgresql94 Collection included in Red Hat Software Collections 2.0, you can either perform a fast upgrade using the pg_upgrade tool (recommended), or dump the database data into a text file with SQL commands and import it in the new database. Note that the second method is usually significantly slower and may require manual fixes; see the PostgreSQL documentation for more information about this upgrade method.

Important

Before migrating your data from PostgreSQL 9.2 to PostgreSQL 9.4, make sure that you back up all your data, including the PostgreSQL database files, which are by default located in the /opt/rh/postgresql92/var/lib/pgsql/data/ directory.

Procedure 5.3. Fast Upgrade Using the pg_upgrade Tool

To perform a fast upgrade of your PostgreSQL server, complete the following steps:
  1. Stop the old PostgreSQL server to ensure that the data is not in an inconsistent state. To do so, type the following at a shell prompt as root: 
    service postgresql92-postgresql stop
    Copy to Clipboard Toggle word wrap
    To verify that the server is not running, type: 
    service postgresql92-postgresql status
    Copy to Clipboard Toggle word wrap
  2. Verify that the old directory /opt/rh/postgresql92/var/lib/pgsql/data/ exists: 
    file /opt/rh/postgresql92/var/lib/pgsql/data/
    Copy to Clipboard Toggle word wrap
    and back up your data.
  3. Verify that the new data directory /var/opt/rh/rh-postgresql94/lib/pgsql/data/ does not exist: 
    file /var/opt/rh/rh-postgresql94/lib/pgsql/data/
    Copy to Clipboard Toggle word wrap
    If you are running a fresh installation of PostgreSQL 9.4, this directory should not be present in your system. If it is, back it up by running the following command as root: 
    mv /var/opt/rh/rh-postgresql94/lib/pgsql/data{,-scl-backup}
    Copy to Clipboard Toggle word wrap
  4. Upgrade the database data for the new server by running the following command as root: 
    scl enable rh-postgresql94 -- postgresql-setup --upgrade --upgrade-from=postgresql92-postgresql
    Copy to Clipboard Toggle word wrap
    Alternatively, you can use the /opt/rh/rh-postgresql94/root/usr/bin/postgresql-setup --upgrade --upgrade-from=postgresql92-postgresql command.
    Note that you can use the --upgrade-from option for upgrading from different versions of PostgreSQL. The list of possible upgrade scenarios is available using the --upgrade-ids option.
    It is recommended that you read the resulting /var/lib/pgsql/upgrade_rh-postgresql94-postgresql.log log file to find out if any problems occurred during the upgrade.
  5. Start the new server as root: 
    service rh-postgresql94-postgresql start
    Copy to Clipboard Toggle word wrap
    It is also advised that you run the analyze_new_cluster.sh script as follows: 
    su - postgres -c 'scl enable rh-postgresql94 ~/analyze_new_cluster.sh'
    Copy to Clipboard Toggle word wrap
  6. Optionally, you can configure the PostgreSQL 9.4 server to start automatically at boot time. To disable the old PostgreSQL 9.2 server, type the following command as root: 
    chkconfig postgresql92-postgreqsql off
    Copy to Clipboard Toggle word wrap
    To enable the PostgreSQL 9.4 server, type as root: 
    chkconfig rh-postgresql94-postgresql on
    Copy to Clipboard Toggle word wrap
  7. If your configuration differs from the default one, make sure to update configuration files, especially the /var/opt/rh/rh-postgresql94/lib/pgsql/data/pg_hba.conf configuration file. Otherwise only the postgres user will be allowed to access the database.

Procedure 5.4. Performing a Dump and Restore Upgrade

To perform a dump and restore upgrade of your PostgreSQL server, complete the following steps:
  1. Ensure that the old PostgreSQL server is running by typing the following at a shell prompt as root: 
    service postgresql92-postgresql start
    Copy to Clipboard Toggle word wrap
  2. Dump all data in the PostgreSQL database into a script file. As root, type: 
    su - postgres -c 'scl enable postgresql92 "pg_dumpall" > ~/pgdump_file.sql'
    Copy to Clipboard Toggle word wrap
  3. Stop the old server by running the following command as root: 
    service postgresql92-postgresql stop
    Copy to Clipboard Toggle word wrap
  4. Initialize the data directory for the new server as root: 
    scl enable rh-postgresql94-postgresql -- postgresql-setup --initdb
    Copy to Clipboard Toggle word wrap
  5. Start the new server as root: 
    service rh-postgresql94-postgresql start
    Copy to Clipboard Toggle word wrap
  6. Import data from the previously created SQL file: 
    su - postgres -c 'scl enable rh-postgresql94 "psql -f ~/pgdump_file.sql postgres"'
    Copy to Clipboard Toggle word wrap
  7. Optionally, you can configure the PostgreSQL 9.4 server to start automatically at boot time. To disable the old PostgreSQL 9.2 server, type the following command as root: 
    chkconfig postgresql92-postgresql off
    Copy to Clipboard Toggle word wrap
    To enable the PostgreSQL 9.4 server, type as root: 
    chkconfig rh-postgresql94-postgresql on
    Copy to Clipboard Toggle word wrap
  8. If your configuration differs from the default one, make sure to update configuration files, especially the /var/opt/rh/rh-postgresql94/lib/pgsql/data/pg_hba.conf configuration file. Otherwise only the postgres user will be allowed to access the database.

5.5. Migrating to nginx 1.6
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The nginx16 Software Collection uses a new prefix in accordance with the name of the collection and a different path to the root directory, which is now located in /opt/rh/nginx16/root/. The error log is now stored in /var/log/nginx16/error.log by default, and the initscript is called nginx16-nginx.
Configuration files in nginx 1.6 have the same format as in the previous version and they are compatible between version 1.4 and 1.6.

Important

Before upgrading from nginx 1.4 to nginx 1.6, back up all your data, including web pages and configuration files located in the /opt/rh/nginx14/root/ tree.
If you have made any specific changes, such as changing configuration files or setting up web applications, in the /opt/rh/nginx14/root/ tree, replicate those changes in the new /opt/rh/nginx16/root/ directory, too.
For the official nginx documentation, refer to http://nginx.org/en/docs/.

Chapter 6. Additional Resources
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This chapter provides references to other relevant sources of information about Red Hat Software Collections 2.0 and Red Hat Enterprise Linux.
Users of Red Hat Software Collections can access the Red Hat Enterprise Linux Developer Program Group in the Red Hat Customer Portal to get developer related information for the development tools available for Red Hat Enterprise Linux. In addition, users can find developer related papers and videos on topics that are of interest to developers, for example RPM building, threaded programming, performance tuning, debugging, and so on.
To visit the Red Hat Enterprise Linux Developer Program Group, log in to the Red Hat Customer Portal, click Products and Services at the top of the page, choose Services, and then Red Hat Enterprise Linux Developer Program from the list.

6.2. Red Hat Product Documentation
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The following documents are directly or indirectly relevant to this book:

6.3. Red Hat Developer Blog
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Red Hat Developer Blog content is directed to designers and developers of applications based on Red Hat technologies. It contains links to product team blogs and other relevant internal and external resources. Its goal is to inform and engage the developer community with up-to-date information, best practices, opinion, product and program announcements as well as pointers to sample code and other resources.

Appendix A. Revision History
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Revision History
Revision 2.0-18Thu Jun 09 2016Lenka Špačková
Fixed a path in the MySQL and MariaDB in-place upgrade example.
Revision 2.0-15Thu Jun 04 2015Lenka Špačková
Release of Red Hat Software Collections 2.0 Release Notes.
Revision 2.0-5Thu Apr 23 2015Lenka Špačková
Release of Red Hat Software Collections 2.0 Beta Release Notes.

Legal Notice
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Copyright © 2015 Red Hat, Inc.
This document is licensed by Red Hat under the Creative Commons Attribution-ShareAlike 3.0 Unported License. If you distribute this document, or a modified version of it, you must provide attribution to Red Hat, Inc. and provide a link to the original. If the document is modified, all Red Hat trademarks must be removed.
Red Hat, as the licensor of this document, waives the right to enforce, and agrees not to assert, Section 4d of CC-BY-SA to the fullest extent permitted by applicable law.
Red Hat, Red Hat Enterprise Linux, the Shadowman logo, JBoss, OpenShift, Fedora, the Infinity logo, and RHCE are trademarks of Red Hat, Inc., registered in the United States and other countries.
Linux® is the registered trademark of Linus Torvalds in the United States and other countries.
Java® is a registered trademark of Oracle and/or its affiliates.
XFS® is a trademark of Silicon Graphics International Corp. or its subsidiaries in the United States and/or other countries.
MySQL® is a registered trademark of MySQL AB in the United States, the European Union and other countries.
Node.js® is an official trademark of Joyent. Red Hat Software Collections is not formally related to or endorsed by the official Joyent Node.js open source or commercial project.
The OpenStack® Word Mark and OpenStack logo are either registered trademarks/service marks or trademarks/service marks of the OpenStack Foundation, in the United States and other countries and are used with the OpenStack Foundation's permission. We are not affiliated with, endorsed or sponsored by the OpenStack Foundation, or the OpenStack community.
All other trademarks are the property of their respective owners.
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