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Chapter 1. Red Hat Software Collections 3.1

This chapter serves as an overview of the Red Hat Software Collections 3.1 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

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.
Red Hat Software Collections 3.1 is be available for Red Hat Enterprise Linux 7; selected new components and previously released components also for Red Hat Enterprise Linux 6. 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 two years from the release of each major version. 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.

1.1.1. Red Hat Developer Toolset

Red Hat Developer Toolset is a 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

Table 1.1, “Red Hat Software Collections 3.1 Components” lists all components that are supported at the time of the Red Hat Software Collections 3.1 release.
Table 1.1. Red Hat Software Collections 3.1 Components
Component Software Collection Description
Red Hat Developer Toolset 7.1 devtoolset-7 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, 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.
Eclipse 4.6.3[a] rh-eclipse46 A release of the Eclipse integrated development environment that is based on the Eclipse Foundation's Neon release train. Eclipse was previously available as a Red Hat Developer Toolset component. This Software Collection depends on the rh-java-common component.
Perl 5.24.0 rh-perl524 A release of Perl, a high-level programming language that is commonly used for system administration utilities and web programming. The rh-perl524 Software Collection provides additional utilities, scripts, and database connectors for MySQL and PostgreSQL. It includes the DateTime Perl module and the mod_perl Apache httpd module, which is supported only with the httpd24 Software Collection. Additionally, it provides the cpanm utility for easy installation of CPAN modules.
Perl 5.26.1 [a] rh-perl526 A release of Perl, a high-level programming language that is commonly used for system administration utilities and web programming. The rh-perl526 Software Collection provides additional utilities, scripts, and database connectors for MySQL and PostgreSQL. It includes the DateTime Perl module and the mod_perl Apache httpd module, which is supported only with the httpd24 Software Collection. Additionally, it provides the cpanm utility for easy installation of CPAN modules. The rh-perl526 packaging is aligned with upstream; the perl526-perl package installs also core modules, while the interpreter is provided by the perl-interpreter package.
PHP 7.0.27 rh-php70 A release of PHP 7.0 with PEAR 1.10, enhanced language features and performance improvement.
PHP 7.1.8 [a] rh-php71 A release of PHP 7.1 with PEAR 1.10, APCu 5.1.8, and enhanced language features.
Python 2.7.13 python27 A release of Python 2.7 with a number of additional utilities. This Python version provides various features and enhancements, including an ordered dictionary type, faster I/O operations, and improved forward compatibility with Python 3. The python27 Software Collections contains the Python 2.7.13 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 3.5.1 rh-python35 The rh-python35 Software Collection contains Python 3.5.1 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.
Python 3.6.3 rh-python36 The rh-python36 Software Collection contains Python 3.6.3, which introduces a number of new features, such as f-strings, syntax for variable annotations, and asynchronous generators and comprehensions. In addition, a set of extension libraries useful for programming web applications is included, with mod_wsgi (supported only together with the httpd24 Software Collection), PostgreSQL database connector, and numpy and scipy.
Ruby 2.3.6 rh-ruby23 A release of Ruby 2.3. This version introduces a command-line option to freeze all string literals in the source files, a safe navigation operator, and multiple performance enhancements, while maintaining source-level backward compatibility with Ruby 2.2, Ruby 2.0.0, and Ruby 1.9.3.
Ruby 2.4.3 rh-ruby24 A release of Ruby 2.4. This version provides multiple performance improvements and enhancements, for example improved hash table, new debugging features, support for Unicode case mappings, and support for OpenSSL 1.1.0. Ruby 2.4.0 maintains source-level backward compatibility with Ruby 2.3, Ruby 2.2, Ruby 2.0.0, and Ruby 1.9.3.
Ruby 2.5.0 [a] rh-ruby25 A release of Ruby 2.5. This version provides multiple performance improvements and new features, for example, simplified usage of blocks with the rescue, else, and ensure keywords, a new yield_self method, support for branch coverage and method coverage measurement, new Hash#slice and Hash#transform_keys methods. Ruby 2.5.0 maintains source-level backward compatibility with Ruby 2.4.
Ruby on Rails 4.2.6 rh-ror42 A release of Ruby on Rails 4.2, a web application framework written in the Ruby language. Highlights in this release include Active Job, asynchronous mails, Adequate Record, Web Console, and foreign key support. This Software Collection is supported together with the rh-ruby23 and rh-nodejs4 Collections.
Ruby on Rails 5.0.1 rh-ror50 A release of Ruby on Rails 5.0, the latest version of the web application framework written in the Ruby language. Notable new features include Action Cable, API mode, exclusive use of rails CLI over Rake, and ActionRecord attributes. This Software Collection is supported together with the rh-ruby24 and rh-nodejs6 Collections.
Scala 2.10.6 [a] rh-scala210 A release of Scala, a general purpose programming language for the Java platform, which integrates features of object-oriented and functional languages.
MariaDB 10.1.29 rh-mariadb101 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 Galera Cluster support.
MariaDB 10.2.8 rh-mariadb102 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 MariaDB Backup, Flashback, support for Recursive Common Table Expressions, window functions, and JSON functions.
MongoDB 3.2.10 rh-mongodb32 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 version 3.2.1.
MongoDB 3.4.9 rh-mongodb34 A release of MongoDB, a cross-platform document-oriented database system classified as a NoSQL database. This release introduces support for new architectures, adds message compression and support for the decimal128 type, enhances collation features and more.
MongoDB 3.6.3 [a] rh-mongodb36 A release of MongoDB, a cross-platform document-oriented database system classified as a NoSQL database. This release introduces change streams, retryable writes, and JSON Schema, as well as other features.
MySQL 5.7.21 rh-mysql57 A release of MySQL, which provides a number of new features and enhancements, including improved performance.
PostgreSQL 9.5.9 rh-postgresql95 A release of PostgreSQL, which provides a number of enhancements, including row-level security control, introduces replication progress tracking, improves handling of large tables with high number of columns, and improves performance for sorting and multi-CPU machines.
PostgreSQL 9.6.5 rh-postgresql96 A release of PostgreSQL, which introduces parallel execution of sequential scans, joins, and aggregates, and provides enhancements to synchronous replication, full-text search, deration driver, postgres_fdw, as well as performance improvements.
PostgreSQL 10.3 [a] rh-postgresql10 A release of PostgreSQL, which includes a significant performance improvement and a number of new features, such as logical replication using the publish and subscribe keywords, or stronger password authentication based on the SCRAM-SHA-256 mechanism.
Node.js 4.6.2 rh-nodejs4 A release of Node.js, which provides a JavaScript runtime built on Chrome's V8 JavaScript engine and npm 2.15.1, a package manager for JavaScript. This version includes an enhanced API, multiple security and bug fixes, and support for the SPDY protocol version 3.1
Node.js 6.11.3 rh-nodejs6 A release of Node.js, which provides multiple API enhancements, performance and security improvements, ECMAScript 2015 support, and npm 3.10.9.
Node.js 8.9.4 [a] rh-nodejs8 A release of Node.js, which provides multiple API enhancements and new features, including V8 engine version 6.0, npm 5.6.0 and npx, enhanced security, experimental N-API support, and performance improvements.
nginx 1.8.1 rh-nginx18 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 back-end SSL certificate verification, logging to syslog, thread pools support for offloading I/O requests, or hash load balancing method.
nginx 1.10.2 rh-nginx110 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 dynamic module support, HTTP/2 support, Perl integration, and numerous performance improvements.
nginx 1.12.1 [a] rh-nginx112 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 IP Transparency, improved TCP/UDP load balancing, enhanced caching performance, and numerous performance improvements.
Apache httpd 2.4.27 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.
Varnish Cache 4.0.3 rh-varnish4 A release of Varnish Cache, a high-performance HTTP reverse proxy. Varnish Cache stores files or fragments of files in memory that are used to reduce the response time and network bandwidth consumption on future equivalent requests.
Varnish Cache 5.2.1 [a] rh-varnish5 A release of Varnish Cache, a high-performance HTTP reverse proxy. This version includes the shard director, experimental HTTP/2 support, and improvements to Varnish configuration through separate VCL files and VCL labels.
Maven 3.3.9 rh-maven33 A release of Maven, a software project management and comprehension tool used primarily for Java projects. This version provides various enhancements, for example, improved core extension mechanism.
Maven 3.5.0 [a] rh-maven35 A release of Maven, a software project management and comprehension tool. This release introduces support for new architectures and a number of new features, including colorized logging.
Git 2.9.3 rh-git29 A release of Git, a distributed revision control system with a decentralized architecture. As opposed to centralized version control systems with a client-server model, Git ensures that each working copy of a Git repository is its exact copy with complete revision history.
Redis 3.2.4 rh-redis32 A release of Redis 3.2, a persistent key-value database.
HAProxy 1.8.4 [a] rh-haproxy18 A release of HAProxy 1.8, a reliable, high-performance network load balancer for TCP and HTTP-based applications.
Common Java Packages 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-4, devtoolset-3, rh-maven33, maven30, rh-mongodb32, rh-mongodb26, thermostat1, rh-thermostat16, and rh-eclipse46 components and it is not supposed to be installed directly by users.
[a] This Software Collection is available only for Red Hat Enterprise Linux 7
Previously released Software Collections remain available in the same distribution channels. All Software Collections, including retired components, are listed in the Table 1.2, “All Available Software Collections”. Software Collections that are no longer supported are marked with an asterisk (*).
See the Red Hat Software Collections Product Life Cycle document for information on the length of support for individual components. For detailed information regarding previously released components, refer to the Release Notes for earlier versions of Red Hat Software Collections.
Table 1.2. All Available Software Collections
Component Software Collection Availability Architectures supported on RHEL7
Components New in Red Hat Software Collections 3.1
Perl 5.26.1rh-perl526RHEL7x86_64, s390x, aarch64, ppc64le
Ruby 2.5.0rh-ruby25RHEL7x86_64, s390x, aarch64, ppc64le
MongoDB 3.6.3rh-mongodb36RHEL7x86_64, s390x, aarch64, ppc64le
Varnish Cache 5.2.1rh-varnish5RHEL7x86_64, s390x, aarch64, ppc64le
PostgreSQL 10.3rh-postgresql10RHEL7x86_64, s390x, aarch64, ppc64le
HAProxy 1.8.4rh-haproxy18RHEL7x86_64
Table 1.2. All Available Software Collections
Components Updated in Red Hat Software Collections 3.1
Red Hat Developer Toolset 7.1devtoolset-7RHEL6, RHEL7x86_64, s390x, aarch64, ppc64, ppc64le
PHP 7.0.27rh-php70RHEL6, RHEL7x86_64
MySQL 5.7.21rh-mysql57RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
Apache httpd 2.4.27httpd24RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 3.0
PHP 7.1.8rh-php71RHEL7x86_64, s390x, aarch64, ppc64le
nginx 1.12.1rh-nginx112RHEL7x86_64, s390x, aarch64, ppc64le
Python 3.6.3rh-python36RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
Maven 3.5.0rh-maven35RHEL7x86_64, s390x, aarch64, ppc64le
MariaDB 10.2.8rh-mariadb102RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
PostgreSQL 9.6.5rh-postgresql96RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
MongoDB 3.4.9rh-mongodb34RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
Node.js 8.9.4rh-nodejs8RHEL7x86_64, s390x, aarch64, ppc64le
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 2.4
Red Hat Developer Toolset 6.1devtoolset-6RHEL6, RHEL7x86_64, s390x, aarch64, ppc64, ppc64le
Scala 2.10.6rh-scala210RHEL7x86_64
nginx 1.10.2rh-nginx110RHEL6, RHEL7x86_64
Node.js 6.11.3rh-nodejs6RHEL6, RHEL7x86_64
Ruby 2.4.3rh-ruby24RHEL6, RHEL7x86_64
Ruby on Rails 5.0.1rh-ror50RHEL6, RHEL7x86_64
Eclipse 4.6.3rh-eclipse46RHEL7x86_64
Python 2.7.13python27RHEL6, RHEL7x86_64
Thermostat 1.6.6rh-thermostat16*RHEL6, RHEL7x86_64
Maven 3.3.9rh-maven33RHEL6, RHEL7x86_64
Common Java Packagesrh-java-common RHEL6, RHEL7x86_64
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 2.3
Git 2.9.3rh-git29RHEL6, RHEL7x86_64
Redis 3.2.4rh-redis32RHEL6, RHEL7x86_64
Perl 5.24.0rh-perl524RHEL6, RHEL7x86_64
Python 3.5.1rh-python35RHEL6, RHEL7x86_64
MongoDB 3.2.10rh-mongodb32RHEL6, RHEL7x86_64
Ruby 2.3.6rh-ruby23RHEL6, RHEL7x86_64
PHP 5.6.25rh-php56*RHEL6, RHEL7x86_64
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 2.2
Red Hat Developer Toolset 4.1devtoolset-4*RHEL6, RHEL7x86_64
MariaDB 10.1.29rh-mariadb101RHEL6, RHEL7x86_64
MongoDB 3.0.11 upgrade collection rh-mongodb30upg*RHEL6, RHEL7x86_64
Node.js 4.6.2rh-nodejs4RHEL6, RHEL7x86_64
PostgreSQL 9.5.9rh-postgresql95RHEL6, RHEL7x86_64
Ruby on Rails 4.2.6rh-ror42RHEL6, RHEL7x86_64
MongoDB 2.6.9rh-mongodb26*RHEL6, RHEL7x86_64
Thermostat 1.4.4thermostat1*RHEL6, RHEL7x86_64
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 2.1
Varnish Cache 4.0.3rh-varnish4RHEL6, RHEL7x86_64
nginx 1.8.1rh-nginx18RHEL6, RHEL7x86_64
Node.js 0.10nodejs010*RHEL6, RHEL7x86_64
Maven 3.0.5maven30*RHEL6, RHEL7x86_64
V8 3.14.5.10v8314*RHEL6, RHEL7x86_64
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 2.0
Red Hat Developer Toolset 3.1devtoolset-3*RHEL6, RHEL7x86_64
Perl 5.20.1rh-perl520*RHEL6, RHEL7x86_64
Python 3.4.2rh-python34*RHEL6, RHEL7x86_64
Ruby 2.2.9rh-ruby22*RHEL6, RHEL7x86_64
Ruby on Rails 4.1.5rh-ror41*RHEL6, RHEL7x86_64
MariaDB 10.0.33rh-mariadb100*RHEL6, RHEL7x86_64
MySQL 5.6.40rh-mysql56*RHEL6, RHEL7x86_64
PostgreSQL 9.4.14rh-postgresql94*RHEL6, RHEL7x86_64
Passenger 4.0.50rh-passenger40*RHEL6, RHEL7x86_64
PHP 5.4.40php54*RHEL6, RHEL7x86_64
PHP 5.5.21php55*RHEL6, RHEL7x86_64
nginx 1.6.2nginx16*RHEL6, RHEL7x86_64
DevAssistant 0.9.3devassist09*RHEL6, RHEL7x86_64
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 1
Git 1.9.4git19*RHEL6, RHEL7x86_64
Perl 5.16.3perl516*RHEL6, RHEL7x86_64
Python 3.3.2python33*RHEL6, RHEL7x86_64
Ruby 1.9.3ruby193*RHEL6, RHEL7x86_64
Ruby 2.0.0ruby200*RHEL6, RHEL7x86_64
Ruby on Rails 4.0.2ror40*RHEL6, RHEL7x86_64
MariaDB 5.5.53mariadb55*RHEL6, RHEL7x86_64
MongoDB 2.4.9mongodb24*RHEL6, RHEL7x86_64
MySQL 5.5.52mysql55*RHEL6, RHEL7x86_64
PostgreSQL 9.2.18postgresql92*RHEL6, RHEL7x86_64
RHEL6 — Red Hat Enterprise Linux 6
RHEL7 — Red Hat Enterprise Linux 7
x86_64 — AMD64 and Intel 64 architectures
s390x — IBM z Systems
aarch64 — The 64-bit ARM architecture
ppc64 — IBM POWER, big endian
ppc64le — IBM POWER, little endian
* Retired component — this Software Collection is no longer supported
The tables above list the latest versions available through asynchronous updates.
Note that Software Collections released in Red Hat Software Collections 2.0 and later include a rh- prefix in their names.

1.3. Changes in Red Hat Software Collections 3.1

1.3.1. Overview

Architectures

The Red Hat Software Collections offering contains packages for Red Hat Enterprise Linux 7 running on AMD64 and Intel 64 architectures; certain Software Collections are available also for Red Hat Enterprise Linux 6.
In addition, Red Hat Software Collections 3.1 supports the following architectures on Red Hat Enterprise Linux 7:
  • The 64-bit ARM architecture
  • IBM z Systems
  • IBM POWER, little endian
For a full list of components and their availability, see Table 1.2, “All Available Software Collections”.

New Software Collections

Red Hat Software Collections 3.1 adds these new Software Collections:
All new Software Collections are available only for Red Hat Enterprise Linux 7.

Updated Software Collections

The following components hav been updated in Red Hat Software Collections 3.1:

Red Hat Software Collections Container Images

The following container images are new in Red Hat Software Collections 3.1:
  • rhscl/perl-526-rhel7
  • rhscl/ruby-25-rhel7
  • rhscl/mongodb-36-rhel7
  • rhscl/varnish-5-rhel7
  • rhscl/postgresql-10-rhel7
The following container images have been updated in Red Hat Software Collections 3.1:
  • rhscl/devtoolset-7-toolchain-rhel7
  • rhscl/devtoolset-7-perftools-rhel7
  • rhscl/php-70-rhel7
  • rhscl/httpd-24-rhel7
For detailed information regarding Red Hat Software Collections container images, see Section 3.4, “Red Hat Software Collections Container Images”.

1.3.2. Changes in Red Hat Developer Toolset

The following components have been upgraded in Red Hat Developer Toolset 7.1 compared to the previous release of Red Hat Developer Toolset:
  • GCC to version 7.3.1
In addition, bug fix updates are available for the following components:
  • GDB
  • Valgrind
  • elfutils
  • binutils
  • dwz
  • memstomp
  • make
  • ltrace
  • strace
  • OProfile
  • SystemTap
  • Dyninst
For detailed information on changes in 7.1, see the Red Hat Developer Toolset User Guide.

1.3.3. Changes in Perl

The new rh-perl526 Software Collection includes Perl 5.26.1, which provides a number of bug fixes and enhancements over the previous version. Some of the notable changes with widespread effects are:
  • The current directory . has been removed from the @INC module search path for security reasons
  • The do statement now returns a deprecation warning when it fails to load a file because of the behavioral change described above
  • Unescaped literal { characters in regular expression patterns are no longer permissible
  • Unicode 9.0 is now supported
For detailed changes in Perl 5.26, see the upstream change log for versions 5.26.0 and 5.26.1.
In addition, the rh-perl526 packaging is aligned with upstream. The rh-perl526-perl package installs also core modules, while the /usr/bin/perl interpreter is provided by the rh-perl526-perl-interpreter package. In previous releases, the perl package included just a minimal interpreter, whereas the perl-core package included bothe the interpreter and the core modules.

1.3.4. Changes in Ruby

The new rh-ruby25 Software Collection provides Ruby 2.5.0. This version introduces performance improvements and a number of new features and changes, for example:
  • The rescue, else, and ensure keywords can now be used directly within blocks delimited by do and end without the need to add the begin and end keywords
  • A new yield_self method has been added to return the result of the block
  • Support for branch coverage and method coverage measurement has been added
  • New Hash#slice and Hash#transform_keys methods have been implemented
  • Struct subclass constructors can accept keyword arguments
  • Top-level constant look-up is no longer available
Ruby 2.5.0 maintains source-level backward compatibility with Ruby 2.4.
For detailed changes in Ruby 2.5.0, see the upstream release notes.

1.3.5. Changes in MongoDB

The new rh-mongodb36 Software Collection includes MongoDB 3.6.3, which provides a number of bug fixes and enhancements over the previous version. The most notable new features are:
  • Change streams, which enable applications to access real-time data changes and immediately react to them
  • Retryable writes, which enable MongoDB drivers to automatically retry certain write operations, for example, in case of a network error
  • JSON Schema, which enables users to define their own criteria for validating JSON documents
The following subpackages have also been upgraded:
  • mongo-c-driver to version 1.9.2
  • mongo-cxx-driver to version 3.2.0
  • mongo-tools to version 3.6.3
  • mongo-java-driver to version 3.6.3
For detailed changes in MongoDB 3.6, refer to the upstream release notes.

Note

The rh-mongodb36-mongo-cxx-driver package has been built with the -std=gnu++14 option using GCC from Red Hat Developer Toolset 6. Binaries using the shared library for the MongoDB C++ Driver that use C++11 (or later) features have to be built also with Red Hat Developer Toolset 6 or later. See C++ compatibility details in the Red Hat Developer Toolset 6 User Guide.
The rh-mongodb36 Software Collection includes the rh-mongodb36-syspaths package, which installs packages that provide system-wide wrappers for binaries, scripts, manual pages, and other. After installing the rh-mongodb36*-syspaths packages, users are not required to use the scl enable command for correct functioning of the binaries and scripts provided by the rh-mongodb36* packages. To find out more about syspaths, see the Red Hat Software Collections Packaging Guide.
For instructions regarding migration, see Section 5.2, “Migrating to MongoDB 3.6”.

1.3.6. Changes in PostgreSQL

The new rh-postgresql10 Software Collection provides PostgreSQL 10.3. Major enhancements in this version include:
  • Logical replication using the publish and subscribe keywords
  • Stronger password authentication based on the SCRAM-SHA-256 mechanism
  • Declarative table partitioning
  • Improved query parallelism
  • Significant general performance improvements
  • Improved monitoring and control
For detailed changes in PostgreSQL 10.3, see the upstream documetation.
The rh-postgresql10 Software Collection includes the rh-postgresql10-syspaths package, which installs packages that provide system-wide wrappers for binaries, scripts, manual pages, and other. After installing the rh-postgreqsl10*-syspaths packages, users are not required to use the scl enable command for correct functioning of the binaries and scripts provided by the rh-postgreqsl10* packages. Note that the *-syspaths packages conflict with the corresponding packages from the base Red Hat Enterprise Linux system. To find out more about syspaths, see the Red Hat Software Collections Packaging Guide.
For information on migration, see Section 5.5, “Migrating to PostgreSQL 10”.

1.3.7. Changes in Varnish Cache

The new rh-varnish5 Software Collection includes Varnish Cache 5.2.1, which provides a number of bug fixes and enhancements over the previous version. Notably:
  • Improvements to configuration through separate Varnish Configuration Language (VCL) files and VCL labels, which can reduce complexity in configuration
  • Experimental HTTP/2 support
  • The shard director
  • Improved stability
For detailed changes in Varnish Cache 5.2.1, refer to the upstream change log. See also the upstream documentation and upgrading notes.

1.3.8. Changes in HAProxy

The new rh-haproxy18 Software Collection provides HAProxy 1.8.4. The most notable changes in this version include:
For detail changes in HAProxy since version 1.5, included in Red Hat Enterprise Linux 7, see the HAProxy Configuration Manual.

1.3.9. Changes in PHP

The rh-php70 Software Collection has been upgraded to version 7.0.27, which provides a number of bug fixes and enhancements over the version released in Red Hat Software Collections 2.3.
For detailed information on bug fixes and enhancements in this release, see the upstream change log for version 7.0.27 and earlier.

1.3.10. Changes in MySQL

This update adds support for the following architectures to the rh-mysql57 Software Collection:
  • The 64-bit ARM architecture
  • IBM z Systems
  • IBM POWER, little endian

1.3.11. Changes in Apache httpd

This update adds the httpd24-mod_auth_mellon package to the httpd24 Software Collection. The mod_auth_mellon module for the Apache HTTP Server is an authentication service that implements the SAML 2.0 federation protocol. The module grants access based on the attributes received in assertions generated by an Identity Provider (IdP) server.

1.4. Compatibility Information

Red Hat Software Collections 3.1 is available for all supported releases of Red Hat Enterprise Linux 7 on AMD64 and Intel 64 architectures, the 64-bit ARM architecture, IBM z Systems, and IBM POWER, little endian.
Certain components are available also for all supported releases of Red Hat Enterprise Linux 6 on AMD64 and Intel 64 architectures.
For a full list of available components, see Table 1.2, “All Available Software Collections”.

1.5. Known Issues

httpd24 component, BZ#1429006
Since httpd 2.4.27, the mod_http2 module is no longer supported with the default prefork Multi-Processing Module (MPM). To enable HTTP/2 support, edit the configuration file at /opt/rh/httpd24/root/etc/httpd/conf.modules.d/00-mpm.conf and switch to the event or worker MPM.
Note that the HTTP/2 server-push feature does not work on the 64-bit ARM architecture, IBM z Systems, and IBM POWER, little endian.
httpd24 component, BZ#1327548
The mod_ssl module does not support the ALPN protocol on Red Hat Enterprise Linux 6, or on Red Hat Enterprise Linux 7.3 and earlier. Consequently, clients that support upgrading TLS connections to HTTP/2 only using ALPN are limited to HTTP/1.1 support.
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.
httpd24 component, BZ#1382706
When SELinux is enabled, the LD_LIBRARY_PATH environment variable is not passed through to CGI scripts invoked by httpd. As a consequence, in some cases it is impossible to invoke executables from Software Collections enabled in the /opt/rh/httpd24/service-environment file from CGI scripts run by httpd. To work around this problem, set LD_LIBRARY_PATH as desired from within the CGI script.
httpd24 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 environment variable is not set in httpd24 because it is not required by any application in this Software Collection.
rh-python34, rh-python35, rh-python36 components, BZ#1499990
The pytz module, which is used by Babel for time zone support, is not included in the rh-python34, rh-python35, and rh-python36 Software Collections. Consequently, when the user tries to import the dates module from Babel, a traceback is returned. To work around this problem, install pytz through the pip package manager from the pypi public repository by using the pip install pytz command.
rh-python36 component
Certain complex trigonometric functions provided by numpy might return incorrect values on the 64-bit ARM architecture, IBM z Systems, and IBM POWER, little endian. The AMD64 and Intel 64 architectures are not affected by this problem.
python27 component, BZ#1330489
The python27-python-pymongo package has been updated to version 3.2.1. Note that this version is not fully compatible with the previously shipped version 2.5.2.
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.
scl-utils component
Due to an architecture-specific macro bug in the scl-utils package, the <collection>/root/usr/lib64/ directory does not have the correct package ownership on the 64-bit ARM architecture and on IBM POWER, little endian. As a consequence, this directory is not removed when a Software Collection is uninstalled. To work around this problem, manually delete <collection>/root/usr/lib64/ when removing a Software Collection.
rh-ruby24, rh-ruby23 components
Determination of RubyGem installation paths is dependent on the order in which multiple Software Collections are enabled. The required order has been changed since Ruby 2.3.1 shipped in Red Hat Software Collections 2.3 to support dependent Collections. As a consequence, RubyGem paths, which are used for gem installation during an RPM build, are invalid when the Software Collections are supplied in an incorrect order. For example, the build now fails if the RPM spec file contains scl enable rh-ror50 rh-nodejs6. To work around this problem, enable the rh-ror50 Software Collection last, for example, scl enable rh-nodejs6 rh-ror50.
rh-maven35, rh-maven33 components
When the user has installed both the Red Hat Enterprise Linux system version of maven-local package and the rh-maven35-maven-local package or rh-maven33-maven-local package, XMvn, a tool used for building Java RPM packages, run from the rh-maven35 or rh-maven33 Software Collection tries to read the configuration file from the base system and fails. To work around this problem, uninstall the maven-local package from the base Red Hat Enterprise Linux system.
rh-nodejs4 component, BZ#1316626
The /opt/rh/rh-nodejs4/root/usr/share/licenses/ directory is not owned by any package. Consequently, when the rh-nodejs4 collection is uninstalled, this directory is not removed. To work around this problem, remove the directory manually after uninstalling rh-nodejs4.
perl component
It is impossible to install more than one mod_perl.so library. As a consequence, it is not possible to use the mod_perl module 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 postgresql92, rh-postgresql94, and rh-postgresql95 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.
rh-mysql57, rh-mysql56, rh-mariadb100, rh-mariadb101 components, BZ#1194611
The rh-mysql57-mysql-server, rh-mysql56-mysql-server, rh-mariadb100-mariadb-server, and rh-mariadb101-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.
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 3.1. Additionally, the mongodb24-build and mongodb24-scldevel packages cannot be installed with Red Hat Software Collections 3.1 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.
mariadb, mysql, postgresql, mongodb components
Red Hat Software Collections 3.1 contains the MySQL 5.6, MySQL 5.7, MariaDB 10.0, MariaDB 10.1, MariaDB 10.2, PostgreSQL 9.4, PostgreSQL 9.5, PostgreSQL 9.6, PostgreSQL 10, MongoDB 2.6, MongoDB 3.2, MongoDB 3.4, and MongoDB 3.6 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 or 9.5 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/.
rh-eclipse46 component
When a plug-in from a third-party update site is installed, Eclipse sometimes fails to start with a NullPointerException in the workspace log file. To work around this problem, restart Eclipse with the -clean option. For example: 
~]$ scl enable rh-eclipse46 "eclipse -clean"
rh-eclipse46 component
The Eclipse Docker Tooling introduces a Dockerfile editor with syntax highlighting and a basic command auto-completion. When the Build Image Wizard is open and the Edit Dockerfile button is pressed, the Dockerfile editor opens the file in a detached editor window. However, this window does not contain the Cancel and Save buttons. To work around this problem, press Ctrl+S to save your changes or right-click in the editor to launch a context menu, which offers the Save option. To cancel your changes, close the window.
rh-eclipse46 component
On Red Hat Enterprise Linux 7.2, a bug in the perf tool, which is used to populate the Perf Profile View in Eclipse, causes some of the items in the view not to be properly linked to their respective positions in the Eclipse Editor. While the profiling works as expected, it is not possible to navigate to related positions in the Editor by clicking on parts of the Perl Profile View.
rh-thermostat16 component
Due to typos in the desktop application file, users are unable to launch Thermostat using the desktop icon. To work around this problem, modify the /usr/share/applications/rh-thermostat16-thermostat.desktop file from: 
[Desktop Entry]
Version=1.0
Type=Application
Name=%{thermostat_desktop_app_name}
Comment=A monitoring and serviceability tool for OpenJDK
Exec=/opt/rh/rh-thermostat16/root/usr/share/thermostat/bin/thermostat local
Icon=thermostat
To: 
[Desktop Entry]
Version=1.0
Type=Application
Name=Thermostat-1.6
Comment=A monitoring and serviceability tool for OpenJDK
Exec=scl enable rh-thermostat16 "thermostat local"
Icon=rh-thermostat16-thermostat
Alternatively, run Thermostat from command line: 
$ scl enable rh-thermostat16 "thermostat local"

Other Notes

rh-ruby22, rh-ruby23, rh-python34, rh-python35, rh-php56, rh-php70 components
Using Software Collections on a read-only NFS has several limitations.
  • Ruby gems cannot be installed while the rh-ruby22 or rh-ruby23 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, an error message is displayed, for example: 
    ERROR:  While executing gem ... (Errno::EROFS)
    Read-only file system @ dir_s_mkdir - /opt/rh/rh-ruby22/root/usr/local/share/gems
    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'
  • 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
This is an expected behavior.
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-python35 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, util-linux, screen components
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"
instead of 
scl enable rh-postgresql94 bash
su -l postgres -c psql
When using tools like screen or login, you can use the following command to preserve the environment settings: 
source /opt/rh/<collection_name>/enable
php54 component
Note that Alternative PHP Cache (APC) in Red Hat Software Collections is provided only for user data cache. For opcode cache, Zend OPcache is provided.
python component
When the user tries to install more than one scldevel package from the python27, python33, rh-python34, and rh-python35 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, rh-php56, and rh-php70 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, rh-ruby22, and rh-ruby23 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, rh-perl520, and rh-perl524 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).
nginx component
When the user tries to install more than one scldevel package from the nginx16 and rh-nginx18 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_nginx, %scl_prefix_nginx).
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.
rh-eclipse46 component
The Eclipse SWT graphical library on Red Hat Enterprise Linux 7 uses GTK 3.x. Eclipse Dark Theme is not yet fully stable on GTK 3.x, so this theme is considered a Technology Preview and not supported. For more information about Red Hat Technology Previews, see https://access.redhat.com/support/offerings/techpreview/.

1.6. Deprecated Functionality

httpd24 component, BZ#1434053
Previously, in an SSL/TLS configuration requiring name-based SSL virtual host selection, the mod_ssl module rejected requests with a 400 Bad Request error, if the host name provided in the Host: header did not match the host name provided in a Server Name Indication (SNI) header. Such requests are no longer rejected if the configured SSL/TLS security parameters are identical between the selected virtual hosts, in-line with the behavior of upstream mod_ssl.
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