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Chapter 1. Red Hat Software Collections 3.7

This chapter serves as an overview of the Red Hat Software Collections 3.7 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 3.7 is available for Red Hat Enterprise Linux 7. 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 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.

Note

In Red Hat Enterprise Linux 8, similar components are provided as Application Streams.
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 Components” lists components that are supported at the time of the Red Hat Software Collections 3.7 release. All Software Collections are currently supported only on Red Hat Enterprise Linux 7.
Table 1.1. Red Hat Software Collections Components
Component Software Collection Description
Red Hat Developer Toolset 10.1 devtoolset-10 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.
Perl 5.30.1 rh-perl530 A release of Perl, a high-level programming language that is commonly used for system administration utilities and web programming. The rh-perl530 Software Collection provides additional utilities, scripts, and database connectors for MySQL, PostgreSQL, and SQLite. 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 LWP::UserAgent module for communicating with the HTTP servers, and the LWP::Protocol::https module for securing the communication. The rh-perl530 packaging is aligned with upstream; the perl530-perl package installs also core modules, while the interpreter is provided by the perl-interpreter package.
PHP 7.3.20 rh-php73 A release of PHP 7.3 with PEAR 1.10.9, APCu 5.1.17, and the Xdebug extension.
Python 2.7.18 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 3.8.6 rh-python38 The rh-python38 Software Collection contains Python 3.8, which introduces new Python modules, such as contextvars, dataclasses, or importlib.resources, new language features, improved developer experience, and performance improvements. In addition, a set of popular extension libraries is provided, including mod_wsgi (supported only together with the httpd24 Software Collection), numpy, scipy, and the psycopg2 PostgreSQL database connector.
Ruby 2.6.7 rh-ruby26 A release of Ruby 2.6. This version provides multiple performance improvements and new features, such as endless ranges, the Binding#source_location method, and the $SAFE process global state. Ruby 2.6.0 maintains source-level backward compatibility with Ruby 2.5.
Ruby 2.7.3 rh-ruby27 A release of Ruby 2.7. This version provides multiple performance improvements and new features, such as Compaction GC or command-line interface for the LALR(1) parser generator, and an enhancement to REPL. Ruby 2.7 maintains source-level backward compatibility with Ruby 2.6.
Ruby 3.0.1 rh-ruby30 A release of Ruby 3.0. This version provides multiple performance improvements and new features, such as Ractor, Fiber Scheduler and the RBS language. Ruby 3.0 maintains source-level backward compatibility with Ruby 2.7.
MariaDB 10.3.27 rh-mariadb103 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 introduces system-versioned tables, invisible columns, a new instant ADD COLUMN operation for InnoDB, and a JDBC connector for MariaDB and MySQL.
MariaDB 10.5.9 rh-mariadb105 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 includes various new features, MariaDB Galera Cluster upgraded to version 4, and PAM plug-in version 2.0.
MySQL 8.0.21 rh-mysql80 A release of the MySQL server, which introduces a number of new security and account management features and enhancements.
PostgreSQL 10.15 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.
PostgreSQL 12.5 rh-postgresql12 A release of PostgreSQL, which provides the pgaudit extension, various enhancements to partitioning and parallelism, support for the SQL/JSON path language, and performance improvements.
PostgreSQL 13.2 rh-postgresql13 A release of PostgreSQL, which enables improved query planning and introduces various performance improvements and two new packages, pg_repack and plpython3.
Node.js 12.21.0 rh-nodejs12 A release of Node.js with V8 engine version 7.6, support for ES6 modules, and improved support for native modules.
Node.js 14.16.0 rh-nodejs14 A release of Node.js with V8 version 8.3, a new experimental WebAssembly System Interface (WASI), and a new experimental Async Local Storage API.
nginx 1.16.1 rh-nginx116 A release of nginx, a web and proxy server with a focus on high concurrency, performance, and low memory usage. This version introduces numerous updates related to SSL, several new directives and parameters, and various enhancements.
nginx 1.18.0 rh-nginx118 A release of nginx, a web and proxy server with a focus on high concurrency, performance, and low memory usage. This version introduces enhancements to HTTP request rate and connection limiting, and a new auth_delay directive. In addition, support for new variables has been added to multiple directives.
Apache httpd 2.4.34 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, mod_auth_mellon, and ModSecurity modules are also included.
Varnish Cache 6.0.6 rh-varnish6 A release of Varnish Cache, a high-performance HTTP reverse proxy. This version includes support for Unix Domain Sockets (both for clients and for back-end servers), new level of the VCL language (vcl 4.1), and improved HTTP/2 support.
Maven 3.6.1 rh-maven36 A release of Maven, a software project management and comprehension tool. This release provides various enhancements and bug fixes.
Git 2.27.0 rh-git227 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. This version introduces numerous enhancements; for example, the git checkout command split into git switch and git restore, and changed behavior of the git rebase command. In addition, Git Large File Storage (LFS) has been updated to version 2.11.0.
Redis 5.0.5 rh-redis5 A release of Redis 5.0, a persistent key-value database. Redis now provides redis-trib, a cluster management tool.
HAProxy 1.8.24 rh-haproxy18 A release of HAProxy 1.8, a reliable, high-performance network load balancer for TCP and HTTP-based applications.
JDK Mission Control 8.0.0 rh-jmc This Software Collection includes JDK Mission Control (JMC), a powerful profiler for HotSpot JVMs. JMC provides an advanced set of tools for efficient and detailed analysis of extensive data collected by the JDK Flight Recorder. JMC requires JDK version 11 or later to run. Target Java applications must run with at least OpenJDK version 8 so that JMC can access JDK Flight Recorder features. The rh-jmc Software Collection requires the rh-maven36 Software Collection.
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 3.7
MariaDB 10.5.9rh-mariadb105RHEL7x86_64, s390x, ppc64le
PostgreSQL 13.2rh-postgresql13RHEL7x86_64, s390x, ppc64le
Ruby 3.0.1rh-ruby30RHEL7x86_64, s390x, ppc64le
Table 1.2. All Available Software Collections
Components Updated in Red Hat Software Collections 3.7
Red Hat Developer Toolset 10.1devtoolset-10RHEL7x86_64, s390x, ppc64, ppc64le
JDK Mission Control 8.0.0rh-jmcRHEL7x86_64
Ruby 2.7.3rh-ruby27RHEL7x86_64, s390x, aarch64, ppc64le
Ruby 2.6.7rh-ruby26RHEL7x86_64, s390x, aarch64, ppc64le
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 3.6
Git 2.27.0rh-git227RHEL7x86_64, s390x, ppc64le
nginx 1.18.0rh-nginx118RHEL7x86_64, s390x, ppc64le
Node.js 14.16.0rh-nodejs14RHEL7x86_64, s390x, ppc64le
Apache httpd 2.4.34httpd24RHEL7x86_64, s390x, aarch64, ppc64le
PHP 7.3.20rh-php73RHEL7x86_64, s390x, aarch64, ppc64le
HAProxy 1.8.24rh-haproxy18RHEL7x86_64
Perl 5.30.1rh-perl530RHEL7x86_64, s390x, aarch64, ppc64le
Ruby 2.5.9rh-ruby25*RHEL7x86_64, s390x, aarch64, ppc64le
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 3.5
Red Hat Developer Toolset 9.1devtoolset-9RHEL7x86_64, s390x, aarch64, ppc64, ppc64le
Python 3.8.6rh-python38RHEL7x86_64, s390x, aarch64, ppc64le
Varnish Cache 6.0.6rh-varnish6RHEL7x86_64, s390x, aarch64, ppc64le
Apache httpd 2.4.34 (the last update for RHEL6)httpd24 (RHEL6)*RHEL6x86_64
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 3.4
Node.js 12.21.0rh-nodejs12RHEL7x86_64, s390x, aarch64, ppc64le
nginx 1.16.1rh-nginx116RHEL7x86_64, s390x, aarch64, ppc64le
PostgreSQL 12.5rh-postgresql12RHEL7x86_64, s390x, aarch64, ppc64le
Maven 3.6.1rh-maven36RHEL7x86_64, s390x, aarch64, ppc64le
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 3.3
Red Hat Developer Toolset 8.1devtoolset-8*RHEL6, RHEL7x86_64, s390x, aarch64, ppc64, ppc64le
MariaDB 10.3.27rh-mariadb103RHEL7x86_64, s390x, aarch64, ppc64le
Redis 5.0.5rh-redis5RHEL7x86_64, s390x, aarch64, ppc64le
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 3.2
PHP 7.2.24rh-php72*RHEL7x86_64, s390x, aarch64, ppc64le
MySQL 8.0.21rh-mysql80RHEL7x86_64, s390x, aarch64, ppc64le
Node.js 10.21.0rh-nodejs10*RHEL7x86_64, s390x, aarch64, ppc64le
nginx 1.14.1rh-nginx114*RHEL7x86_64, s390x, aarch64, ppc64le
Git 2.18.4rh-git218*RHEL7x86_64, s390x, aarch64, ppc64le
Table 1.2. All Available Software Collections
Components Last Updated in Red Hat Software Collections 3.1
Red Hat Developer Toolset 7.1devtoolset-7*RHEL6, RHEL7x86_64, s390x, aarch64, ppc64, ppc64le
Perl 5.26.3rh-perl526*RHEL7x86_64, s390x, aarch64, ppc64le
MongoDB 3.6.3rh-mongodb36*RHEL7x86_64, s390x, aarch64, ppc64le
Varnish Cache 5.2.1rh-varnish5*RHEL7x86_64, s390x, aarch64, ppc64le
PostgreSQL 10.15rh-postgresql10RHEL7x86_64, s390x, aarch64, ppc64le
PHP 7.0.27rh-php70*RHEL6, RHEL7x86_64
MySQL 5.7.24rh-mysql57*RHEL6, 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-php71*RHEL7x86_64, s390x, aarch64, ppc64le
nginx 1.12.1rh-nginx112*RHEL7x86_64, s390x, aarch64, ppc64le
Python 3.6.12rh-python36*RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
Maven 3.5.0rh-maven35*RHEL7x86_64, s390x, aarch64, ppc64le
MariaDB 10.2.22rh-mariadb102*RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
PostgreSQL 9.6.19rh-postgresql96*RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
MongoDB 3.4.9rh-mongodb34*RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
Node.js 8.11.4rh-nodejs8*RHEL7x86_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-6*RHEL6, RHEL7x86_64, s390x, aarch64, ppc64, ppc64le
Scala 2.10.6rh-scala210*RHEL7x86_64
nginx 1.10.2rh-nginx110*RHEL6, RHEL7x86_64
Node.js 6.11.3rh-nodejs6*RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
Ruby 2.4.6rh-ruby24*RHEL6, RHEL7x86_64
Ruby on Rails 5.0.1rh-ror50*RHEL6, RHEL7x86_64
Eclipse 4.6.3rh-eclipse46*RHEL7x86_64
Python 2.7.18python27RHEL6*, RHEL7x86_64, s390x, aarch64, ppc64le
Thermostat 1.6.6rh-thermostat16*RHEL6, RHEL7x86_64
Maven 3.3.9rh-maven33*RHEL6, 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-git29*RHEL6, RHEL7x86_64, s390x, aarch64, ppc64le
Redis 3.2.4rh-redis32*RHEL6, RHEL7x86_64
Perl 5.24.0rh-perl524*RHEL6, RHEL7x86_64
Python 3.5.1rh-python35*RHEL6, RHEL7x86_64
MongoDB 3.2.10rh-mongodb32*RHEL6, RHEL7x86_64
Ruby 2.3.8rh-ruby23*RHEL6, 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-mariadb101*RHEL6, RHEL7x86_64
MongoDB 3.0.11 upgrade collection rh-mongodb30upg*RHEL6, RHEL7x86_64
Node.js 4.6.2rh-nodejs4*RHEL6, RHEL7x86_64
PostgreSQL 9.5.14rh-postgresql95*RHEL6, RHEL7x86_64
Ruby on Rails 4.2.6rh-ror42*RHEL6, 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-varnish4*RHEL6, RHEL7x86_64
nginx 1.8.1rh-nginx18*RHEL6, 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
Legend:
  • RHEL6 – Red Hat Enterprise Linux 6
  • RHEL7 – Red Hat Enterprise Linux 7
  • x86_64 – AMD and Intel 64-bit architectures
  • s390x – The 64-bit IBM Z architecture
  • 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.
Eclipse is available as a part of the Red Hat Developer Tools offering.

1.3. Changes in Red Hat Software Collections 3.7

1.3.1. Overview

Architectures

The Red Hat Software Collections offering contains packages for Red Hat Enterprise Linux 7 running on the following architectures:
  • AMD and Intel 64-bit architectures
  • 64-bit IBM Z
  • 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 3.7 adds the following new Software Collections:
All new Software Collections are available only for Red Hat Enterprise Linux 7.

Updated Software Collections

The following components has been updated in Red Hat Software Collections 3.7:
In addition, a new package, rh-postgresql12-pg_repack is now available for PostgreSQL 12.

Red Hat Software Collections Container Images

The following container images are new in Red Hat Software Collections 3.7:
  • rhscl/mariadb-105-rhel7
  • rhscl/postgresql-13-rhel7
  • rhscl/ruby-30-rhel7
The following container images have been updated in Red Hat Software Collections 3.7
  • rhscl/devtoolset-10-toolchain-rhel7
  • rhscl/devtoolset-10-perftools-rhel7
  • rhscl/ruby-27-rhel7
  • rhscl/ruby-26-rhel7
For more information about 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 10.1 compared to the previous release:
  • SystemTap to version 4.4
  • Dyninst to version 10.2.1
  • elfutils to version 0.182
In addition, bug fix updates are available for the following components:
  • GCC
  • GDB
  • binutils
  • annobin
For detailed information on changes in 10.1, see the Red Hat Developer Toolset User Guide.

1.3.3. Changes in MariaDB

The new rh-mariadb105 Software Collection provides MariaDB 10.5.9.
Notable enhancements over the previously available version 10.3 include:
  • MariaDB now uses the unix_socket authentication plug-in by default. The plug-in enables users to use operating system credentials when connecting to MariaDB through the local Unix socket file.
  • MariaDB supports a new FLUSH SSL command to reload SSL certificates without a server restart.
  • MariaDB adds mariadb-* named binaries and mysql* symbolic links pointing to the mariadb-* binaires. For example, the mysqladmin, mysqlaccess, and mysqlshow symlinks point to the mariadb-admin, mariadb-access, and mariadb-show binaries, respectively.
  • MariaDB supports a new INET6 data type for storing IPv6 addresses.
  • MariaDB now uses the Perl Compatible Regular Expressions (PCRE) library version 2.
  • The SUPER privilege has been split into several privileges to better align with each user role. As a result, certain statements have changed required privileges.
  • MariaDB adds a new global variable, binlog_row_metadata, as well as system variables and status variables to control the amount of metadata logged.
  • The default value of the eq_range_index_dive_limit variable has been changed from 0 to 200.
  • A new SHUTDOWN WAIT FOR ALL SLAVES server command and a new mysqladmin shutdown --wait-for-all-slaves option have been added to instruct the server to shut down only after the last binlog event has been sent to all connected replicas.
  • In parallel replication, the slave_parallel_mode variable now defaults to optimistic.
The InnoDB storage engine introduces the following changes:
  • InnoDB now supports an instant DROP COLUMN operation and enables users to change the column order.
  • Defaults of the following variables have been changed: innodb_adaptive_hash_index to OFF and innodb_checksum_algorithm to full_crc32.
  • Several InnoDB variables have been removed or deprecated.
MariaDB Galera Cluster has been upgraded to version 4 with the following notable changes:
  • Galera adds a new streaming replication feature, which supports replicating transactions of unlimited size. During an execution of streaming replication, a cluster replicates a transaction in small fragments.
  • Galera now fully supports Global Transaction ID (GTID).
  • The default value for the wsrep_on option in the /etc/my.cnf.d/galera.cnf file has changed from 1 to 0 to prevent end users from starting wsrep replication without configuring required additional options.
Changes to the PAM plug-in in MariaDB 10.5 include:
  • MariaDB 10.5 adds a new version of the Pluggable Authentication Modules (PAM) plug-in. The PAM plug-in version 2.0 performs PAM authentication using a separate setuid root helper binary, which enables MariaDB to utilize additional PAM modules.
  • In MariaDB 10.5, the Pluggable Authentication Modules (PAM) plug-in and its related files have been moved to a new subpackage, mariadb-pam. This subpackage contains both PAM plug-in versions: version 2.0 is the default, and version 1.0 is available as the auth_pam_v1 shared object library.
  • The rh-mariadb105-mariadb-pam package is not installed by default with the MariaDB server. To make the PAM authentication plug-in available in MariaDB 10.5, install the rh-mariadb105-mariadb-pam package manually.
The rh-mariadb105 Software Collection includes the rh-mariadb105-syspaths package, which installs packages that provide system-wide wrappers for binaries, scripts, manual pages, and other. After installing the rh-mariadb105*-syspaths packages, users are not required to use the scl enable command for correct functioning of the binaries and scripts provided by the rh-mariadb105* 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 compatibility notes and migration instructions, see Section 5.1, “Migrating to MariaDB 10.5”.
For detailed changes in MariaDB 10.5, see the upstream documentation.

1.3.4. Changes in PostgreSQL

The new rh-postgresql13 Software Collection includes PostgreSQL 13.2. This release introduces various enhancements over version 12, such as:
  • Performance improvements resulting from de-duplication of B-tree index entries
  • Improved performance for queries that use aggregates or partitioned tables
  • Improved query planning when using extended statistics
  • Parallelized vacuuming of indexes
  • Incremental sorting
For detailed changes, see the upstream release notes for PostgreSQL 13.
The following new subpackages are available with the rh-postgresql13 Software Collection:
  • The pg_repack package provides a PostgreSQL extension that lets you remove bloat from tables and indexes, and optionally restore the physical order of clustered indexes. For details, see the upstream documentation regarding usage and examples.
    The pg_repack subpackage is now available also for the rh-postgresql12 Software Collection.
  • The plpython3 package provides the PL/Python procedural language extension based on Python 3. PL/Python enables you to write PostgreSQL functions in the Python programming language. For details, see the upstream documentation.
    Previously released PostgreSQL Software Collections include only the plpython package based on Python 2. Red Hat Enterprise Linux 8 provides only plpython3. The rh-postgresql13 Software Collection includes both plpython and plpython3, so that you can migrate to plpython3 before upgrading to Red Hat Enterprise Linux 8.
In addition, the rh-postgresql13 Software Collection includes the rh-postgresql13-syspaths package, which installs packages that provide system-wide wrappers for binaries, scripts, manual pages, and others. After installing the rh-postgresql13*-syspaths packages, users are not required to use the scl enable command for correct functioning of the binaries and scripts provided by the rh-postgresql13* 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.
Note that support for Just-In-Time (JIT) compilation, available in upstream since PostgreSQL 11, is not provided by the rh-postgresql13 Software Collection.
For information on migration, see Section 5.3, “Migrating to PostgreSQL 13”.

1.3.5. Changes in Ruby

The new rh-ruby30 Software Collection provides Ruby 3.0.1, which introduces a number of performance improvements, bug fixes, and new features.
Notable enhancements include:
  • Concurrency and parallelism features:
    • Ractor, an Actor-model abstraction that provides thread-safe parallel execution, is provided as an experimental feature.
    • Fiber Scheduler has been introduced as an experimental feature. Fiber Scheduler intercepts blocking operations, which enables light-weight concurrency without changing existing code.
  • Static analysis features:
    • The RBS language has been introduced, which describes the structure of Ruby programs. The rbs gem has been added to parse type definitions written in RBS.
    • The TypeProf utility has been introduced, which is a type analysis tool for Ruby code.
  • Pattern matching with the case/in expression is no longer experimental.
  • One-line pattern matching has been redesigned as an experimental feature.
  • Find pattern has been added as an experimental feature.
The following performance improvements have been implemented:
  • Pasting long code to the Interactive Ruby Shell (IRB) is now significantly faster.
  • The measure command has been added to IRB for time measurement.
Other notable changes include:
  • Keyword arguments have been separated from other arguments, see the upstream documentation for details.
  • The default directory for user-installed gems is now $HOME/.local/share/gem/ unless the $HOME/.gem/ directory is already present.
For more information about changes in Ruby 3.0, see the upstream announcement for version 3.0.0 and 3.0.1.
The rh-ruby27 and rh-ruby26 Software Collections have been updated with security and bug fixes.

1.3.6. Changes in JDK Mission Control

JDK Mission Control (JMC), provided by the rh-jmc Software Collection, has been upgraded from version 7.1.1 to version 8.0.0. Notable enhancements include:
  • The Treemap viewer has been added to the JOverflow plug-in for visualizing memory usage by classes.
  • The Threads graph has been enhanced with more filtering and zoom options.
  • JDK Mission Control now provides support for opening JDK Flight Recorder recordings compressed with the LZ4 algorithm.
  • New columns have been added to the Memory and TLAB views to help you identify areas of allocation pressure.
  • Graph view has been added to improve visualization of stack traces.
  • The Percentage column has been added to histogram tables.
For more information, see the upstream release notes.

1.4. Compatibility Information

Red Hat Software Collections 3.7 is available for all supported releases of Red Hat Enterprise Linux 7 on AMD and Intel 64-bit architectures, 64-bit IBM Z, and IBM POWER, little endian.
Certain previously released components are available also for the 64-bit ARM architecture.
For a full list of available components, see Table 1.2, “All Available Software Collections”.

1.5. Known Issues

rh-mariadb105 component, BZ#1942526
When the OQGraph storage engine plug-in is loaded to the MariaDB 10.5 server, MariaDB does not warn about dropping a non-existent table. In particular, when the user attempts to drop a non-existent table using the DROP TABLE or DROP TABLE IF EXISTS SQL commands, MariaDB neither returns an error message nor logs a warning.
Note that the OQGraph plug-in is provided by the mariadb-oqgraph-engine package, which is not installed by default.
rh-mariadb component
The rh-mariadb103 Software Collection provides the Pluggable Authentication Modules (PAM) plug-in version 1.0. The rh-mariadb105 Software Collection provides the plug-in versions 1.0 and 2.0, version 2.0 is the default. The PAM plug-in version 1.0 in MariaDB does not work. To work around this problem, use the PAM plug-in version 2.0 provided by rh-mariadb105.
rh-ruby27 component, BZ#1836201
When a custom script requires the Psych YAML parser and afterwards uses the Gem.load_yaml method, running the script fails with the following error message: 
superclass mismatch for class Mark (TypeError)
To work around this problem, add the gem 'psych' line to the script somewhere above the require 'psych' line: 
...
gem 'psych'
...
require 'psych'
Gem.load_yaml
multiple components, BZ#1716378
Certain files provided by the Software Collections debuginfo packages might conflict with the corresponding debuginfo package files from the base Red Hat Enterprise Linux system or from other versions of Red Hat Software Collections components. For example, the python27-python-debuginfo package files might conflict with the corresponding files from the python-debuginfo package installed on the core system. Similarly, files from the httpd24-mod_auth_mellon-debuginfo package might conflict with similar files provided by the base system mod_auth_mellon-debuginfo package. To work around this problem, uninstall the base system debuginfo package prior to installing the Software Collection debuginfo package.
rh-mysql80 component, BZ#1646363
The mysql-connector-java database connector does not work with the MySQL 8.0 server. To work around this problem, use the mariadb-java-client database connector from the rh-mariadb103 Software Collection.
rh-mysql80 component, BZ#1646158
The default character set has been changed to utf8mb4 in MySQL 8.0 but this character set is unsupported by the php-mysqlnd database connector. Consequently, php-mysqlnd fails to connect in the default configuration. To work around this problem, specify a known character set as a parameter of the MySQL server configuration. For example, modify the /etc/opt/rh/rh-mysql80/my.cnf.d/mysql-server.cnf file to read: 
[mysqld]
character-set-server=utf8
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, 64-bit IBM Z, and IBM POWER, little endian.
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.
scl-utils component
In Red Hat Enterprise Linux 7.5 and earlier, 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.
maven component
When the user has installed both the Red Hat Enterprise Linux system version of maven-local package and the rh-maven*-maven-local package, XMvn, a tool used for building Java RPM packages, run from the Maven 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.
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.
httpd, mariadb, mysql, nodejs, perl, php, python, and ruby components, BZ#1072319
When uninstalling the httpd24, rh-mariadb*, rh-mysql*, rh-nodejs*, rh-perl*, rh-php*, python27, rh-python*, or rh-ruby* 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 components, BZ#1194611
Since MariaDB 10 and MySQL 5.6, the rh-mariadb*-mariadb-server and rh-mysql*-mysql-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.
mariadb, mysql, postgresql components
Red Hat Software Collections contains the MySQL 8.0, MariaDB 10.3, MariaDB 10.5, PostgreSQL 10, PostgreSQL 12, and PostgreSQL 13 database servers. 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 10 client library with the PostgreSQL 12 or 13 daemon works as expected.
mariadb, mysql components
MariaDB and MySQL 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/.

1.6. Other Notes

rh-ruby*, rh-python*, rh-php* components
Using Software Collections on a read-only NFS has several limitations.
  • Ruby gems cannot be installed while the rh-ruby* 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
python component
When the user tries to install more than one scldevel package from the python27 and rh-python* 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 rh-php* 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 rh-ruby* 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 rh-perl* 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 rh-nginx* 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).
python component
To mitigate the Web Cache Poisoning CVE-2021-23336 in the Python urllib library, the default separator for the urllib.parse.parse_qsl and urllib.parse.parse_qs functions is being changed from both ampersand (&) and semicolon (;) to only an ampersand.
This change has been implemented in the python27 and rh-python38 Software Collections with the release of the RHSA-2021:3252 and RHSA-2021:3254 advisories.
The change of the default separator is potentially backwards incompatible, therefore Red Hat provides a way to configure the behavior in Python packages where the default separator has been changed. In addition, the affected urllib parsing functions issue a warning if they detect that a customer's application has been affected by the change.
For more information, see the Mitigation of Web Cache Poisoning in the Python urllib library (CVE-2021-23336) Knowledgebase article.
python component
The release of the RHSA-2021:3254 advisory introduces the following change in the rh-python38 Software Collection:
To mitigate CVE-2021-29921, the Python ipaddress module now rejects IPv4 addresses with leading zeros with an AddressValueError: Leading zeros are not permitted error.
Customers who rely on the previous behavior can pre-process their IPv4 address inputs to strip the leading zeros off. For example: 
>>> def reformat_ip(address): return '.'.join(part.lstrip('0') if part != '0' else part for part in address.split('.'))
>>> reformat_ip('0127.0.0.1')
'127.0.0.1'
To strip the leading zeros off with an explicit loop for readability, use: 
def reformat_ip(address):
    parts = []
    for part in address.split('.'):
        if part != "0":
            part = part.lstrip('0')
        parts.append(part)
    return '.'.join(parts)

1.7. 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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