Chapter 1. Red Hat Software Collections 3.5 This chapter serves as an overview of the Red Hat Software Collections 3.5 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 3.5 is available for Red Hat Enterprise Linux 7; selected 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. 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 3.5 release. Table 1.1. Red Hat Software Collections Components Component Software Collection Description Red Hat Developer Toolset 9.1 devtoolset-9 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 5.26.3 [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. Perl 5.30.1 [a] 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 7.2.24 [a] rh-php72 A release of PHP 7.2 with PEAR 1.10.5, APCu 5.1.12, and enhanced language features. PHP 7.3.11 [a] rh-php73 A release of PHP 7.3 with PEAR 1.10.9, APCu 5.1.17, and the Xdebug extension. Python 2.7.17 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 3.6.9 rh-python36 The rh-python36 Software Collection contains Python 3.6.9, 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 . Python 3.8.0 [a] 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 2.5.5 [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 2.6.2 [a] 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 USDSAFE process global state . Ruby 2.6.0 maintains source-level backward compatibility with Ruby 2.5. Ruby 2.7.1 [a] 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. MariaDB 10.2.22 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 . MariaDB 10.3.13 [a] 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 . 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 8.0.17 [a] rh-mysql80 A release of the MySQL server, which introduces a number of new security and account management features and enhancements. PostgreSQL 9.6.10 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 10.12 [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 . PostgreSQL 12.1 [a] 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. Node.js 10.19.0 [a] rh-nodejs10 A release of Node.js, which provides multiple API enhancements and new features, including V8 engine version 6.6, full N-API support , and stability improvements. Node.js 12.16.1 [a] rh-nodejs12 A release of Node.js, with V8 engine version 7.6, support for ES6 modules, and improved support for native modules. nginx 1.14.1 [a] rh-nginx114 A release of nginx, a web and proxy server with a focus on high concurrency, performance, and low memory usage. This version provides a number of features, such as mirror module, HTTP/2 server push, gRPC proxy module, and numerous performance improvements . nginx 1.16.1 [a] 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. 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 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. Varnish Cache 6.0.6 [a] 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 3.5.0 [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 . Maven 3.6.1 [a] rh-maven36 A release of Maven, a software project management and comprehension tool. This release provides various enhancements and bug fixes. Git 2.18.4 [a] rh-git218 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 includes the Large File Storage (LFS) extension . Redis 5.0.5 [a] 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 [a] rh-haproxy18 A release of HAProxy 1.8, a reliable, high-performance network load balancer for TCP and HTTP-based applications. JDK Mission Control 7.1.1 [a] 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 8 or later to run. Target Java applications must run with at least OpenJDK version 11 so that JMC can access JDK Flight Recorder features. The rh-jmc Software Collection requires the rh-maven35 Software Collection. [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 3.5 Perl 5.30.1 rh-perl530 RHEL7 x86_64, s390x, aarch64, ppc64le Python 3.8.0 rh-python38 RHEL7 x86_64, s390x, aarch64, ppc64le Ruby 2.7.1 rh-ruby27 RHEL7 x86_64, s390x, aarch64, ppc64le Table 1.2. All Available Software Collections Components Updated in Red Hat Software Collections 3.5 Red Hat Developer Toolset 9.1 devtoolset-9 RHEL7 x86_64, s390x, aarch64, ppc64, ppc64le Apache httpd 2.4.34 httpd24 RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64le JDK Mission Control 7.1.1 rh-jmc RHEL7 x86_64 Varnish Cache 6.0.6 rh-varnish6 RHEL7 x86_64, s390x, aarch64, ppc64le HAProxy 1.8.24 rh-haproxy18 RHEL7 x86_64 Table 1.2. All Available Software Collections Components Last Updated in Red Hat Software Collections 3.4 Node.js 12.16.1 rh-nodejs12 RHEL7 x86_64, s390x, aarch64, ppc64le PHP 7.3.11 rh-php73 RHEL7 x86_64, s390x, aarch64, ppc64le nginx 1.16.1 rh-nginx116 RHEL7 x86_64, s390x, aarch64, ppc64le PostgreSQL 12.1 rh-postgresql12 RHEL7 x86_64, s390x, aarch64, ppc64le Maven 3.6.1 rh-maven36 RHEL7 x86_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 8.1 devtoolset-8 RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64, ppc64le MariaDB 10.3.13 rh-mariadb103 RHEL7 x86_64, s390x, aarch64, ppc64le Redis 5.0.5 rh-redis5 RHEL7 x86_64, s390x, aarch64, ppc64le Ruby 2.6.2 rh-ruby26 RHEL7 x86_64, s390x, aarch64, ppc64le Table 1.2. All Available Software Collections Components Last Updated in Red Hat Software Collections 3.2 PHP 7.2.24 rh-php72 RHEL7 x86_64, s390x, aarch64, ppc64le MySQL 8.0.17 rh-mysql80 RHEL7 x86_64, s390x, aarch64, ppc64le Node.js 10.19.0 rh-nodejs10 RHEL7 x86_64, s390x, aarch64, ppc64le nginx 1.14.1 rh-nginx114 RHEL7 x86_64, s390x, aarch64, ppc64le Git 2.18.4 rh-git218 RHEL7 x86_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 7.1 devtoolset-7 * RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64, ppc64le Perl 5.26.3 rh-perl526 RHEL7 x86_64, s390x, aarch64, ppc64le Ruby 2.5.5 rh-ruby25 RHEL7 x86_64, s390x, aarch64, ppc64le MongoDB 3.6.3 rh-mongodb36 RHEL7 x86_64, s390x, aarch64, ppc64le Varnish Cache 5.2.1 rh-varnish5 RHEL7 x86_64, s390x, aarch64, ppc64le PostgreSQL 10.12 rh-postgresql10 RHEL7 x86_64, s390x, aarch64, ppc64le PHP 7.0.27 rh-php70 * RHEL6, RHEL7 x86_64 MySQL 5.7.24 rh-mysql57 * RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64le Table 1.2. All Available Software Collections Components Last Updated in Red Hat Software Collections 3.0 PHP 7.1.8 rh-php71 * RHEL7 x86_64, s390x, aarch64, ppc64le nginx 1.12.1 rh-nginx112 * RHEL7 x86_64, s390x, aarch64, ppc64le Python 3.6.9 rh-python36 RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64le Maven 3.5.0 rh-maven35 RHEL7 x86_64, s390x, aarch64, ppc64le MariaDB 10.2.22 rh-mariadb102 RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64le PostgreSQL 9.6.10 rh-postgresql96 RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64le MongoDB 3.4.9 rh-mongodb34 RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64le Node.js 8.11.4 rh-nodejs8 * RHEL7 x86_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 6.1 devtoolset-6 * RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64, ppc64le Scala 2.10.6 rh-scala210 * RHEL7 x86_64 nginx 1.10.2 rh-nginx110 * RHEL6, RHEL7 x86_64 Node.js 6.11.3 rh-nodejs6 * RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64le Ruby 2.4.6 rh-ruby24 * RHEL6, RHEL7 x86_64 Ruby on Rails 5.0.1 rh-ror50 * RHEL6, RHEL7 x86_64 Eclipse 4.6.3 rh-eclipse46 * RHEL7 x86_64 Python 2.7.17 python27 RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64le Thermostat 1.6.6 rh-thermostat16 * RHEL6, RHEL7 x86_64 Maven 3.3.9 rh-maven33 * RHEL6, RHEL7 x86_64 Common Java Packages rh-java-common * RHEL6, RHEL7 x86_64 Table 1.2. All Available Software Collections Components Last Updated in Red Hat Software Collections 2.3 Git 2.9.3 rh-git29 * RHEL6, RHEL7 x86_64, s390x, aarch64, ppc64le Redis 3.2.4 rh-redis32 * RHEL6, RHEL7 x86_64 Perl 5.24.0 rh-perl524 * RHEL6, RHEL7 x86_64 Python 3.5.1 rh-python35 * RHEL6, RHEL7 x86_64 MongoDB 3.2.10 rh-mongodb32 * RHEL6, RHEL7 x86_64 Ruby 2.3.8 rh-ruby23 * RHEL6, RHEL7 x86_64 PHP 5.6.25 rh-php56 * RHEL6, RHEL7 x86_64 Table 1.2. All Available Software Collections Components Last Updated in Red Hat Software Collections 2.2 Red Hat Developer Toolset 4.1 devtoolset-4 * RHEL6, RHEL7 x86_64 MariaDB 10.1.29 rh-mariadb101 * RHEL6, RHEL7 x86_64 MongoDB 3.0.11 upgrade collection rh-mongodb30upg * RHEL6, RHEL7 x86_64 Node.js 4.6.2 rh-nodejs4 * RHEL6, RHEL7 x86_64 PostgreSQL 9.5.14 rh-postgresql95 * RHEL6, RHEL7 x86_64 Ruby on Rails 4.2.6 rh-ror42 * RHEL6, RHEL7 x86_64 MongoDB 2.6.9 rh-mongodb26 * RHEL6, RHEL7 x86_64 Thermostat 1.4.4 thermostat1 * RHEL6, RHEL7 x86_64 Table 1.2. All Available Software Collections Components Last Updated in Red Hat Software Collections 2.1 Varnish Cache 4.0.3 rh-varnish4 * RHEL6, RHEL7 x86_64 nginx 1.8.1 rh-nginx18 * RHEL6, RHEL7 x86_64 Node.js 0.10 nodejs010 * RHEL6, RHEL7 x86_64 Maven 3.0.5 maven30 * RHEL6, RHEL7 x86_64 V8 3.14.5.10 v8314 * RHEL6, RHEL7 x86_64 Table 1.2. All Available Software Collections Components Last Updated in Red Hat Software Collections 2.0 Red Hat Developer Toolset 3.1 devtoolset-3 * RHEL6, RHEL7 x86_64 Perl 5.20.1 rh-perl520 * RHEL6, RHEL7 x86_64 Python 3.4.2 rh-python34 * RHEL6, RHEL7 x86_64 Ruby 2.2.9 rh-ruby22 * RHEL6, RHEL7 x86_64 Ruby on Rails 4.1.5 rh-ror41 * RHEL6, RHEL7 x86_64 MariaDB 10.0.33 rh-mariadb100 * RHEL6, RHEL7 x86_64 MySQL 5.6.40 rh-mysql56 * RHEL6, RHEL7 x86_64 PostgreSQL 9.4.14 rh-postgresql94 * RHEL6, RHEL7 x86_64 Passenger 4.0.50 rh-passenger40 * RHEL6, RHEL7 x86_64 PHP 5.4.40 php54 * RHEL6, RHEL7 x86_64 PHP 5.5.21 php55 * RHEL6, RHEL7 x86_64 nginx 1.6.2 nginx16 * RHEL6, RHEL7 x86_64 DevAssistant 0.9.3 devassist09 * RHEL6, RHEL7 x86_64 Table 1.2. All Available Software Collections Components Last Updated in Red Hat Software Collections 1 Git 1.9.4 git19 * RHEL6, RHEL7 x86_64 Perl 5.16.3 perl516 * RHEL6, RHEL7 x86_64 Python 3.3.2 python33 * RHEL6, RHEL7 x86_64 Ruby 1.9.3 ruby193 * RHEL6, RHEL7 x86_64 Ruby 2.0.0 ruby200 * RHEL6, RHEL7 x86_64 Ruby on Rails 4.0.2 ror40 * RHEL6, RHEL7 x86_64 MariaDB 5.5.53 mariadb55 * RHEL6, RHEL7 x86_64 MongoDB 2.4.9 mongodb24 * RHEL6, RHEL7 x86_64 MySQL 5.5.52 mysql55 * RHEL6, RHEL7 x86_64 PostgreSQL 9.2.18 postgresql92 * RHEL6, RHEL7 x86_64 Legend: RHEL6 - Red Hat Enterprise Linux 6 RHEL7 - Red Hat Enterprise Linux 7 x86_64 - AMD64 and Intel 64 architectures s390x - IBM Z 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 3.5 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 earlier Software Collections are available also for Red Hat Enterprise Linux 6. In addition, Red Hat Software Collections 3.5 supports the following architectures on Red Hat Enterprise Linux 7: The 64-bit ARM architecture 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 3.5 adds the following new Software Collections: rh-perl530 - see Section 1.3.3, "Changes in Perl" rh-python38 - see Section 1.3.4, "Changes in Python" rh-ruby27 - see Section 1.3.5, "Changes in Ruby" 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 3.5: devtoolset-9 - see Section 1.3.2, "Changes in Red Hat Developer Toolset" httpd24 - see Section 1.3.6, "Changes in Apache httpd" rh-varnish6 - see Section 1.3.7, "Changes in Varnish Cache" rh-jmc - see Section 1.3.8, "Changes in JDK Mission Control" rh-haproxy18 - see Section 1.3.9, "Changes in HAProxy" Red Hat Software Collections Container Images The following container images are new in Red Hat Software Collections 3.5: rhscl/perl-530-rhel7 rhscl/python-38-rhel7 rhscl/ruby-27-rhel7 The following container image has been updated in Red Hat Software Collections 3.5 rhscl/httpd-24-rhel7 rhscl/varnish-6-rhel7 rhscl/devtoolset-9-toolchain-rhel7 rhscl/devtoolset-9-perftools-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 component has been upgraded in Red Hat Developer Toolset 9.1 compared to the release of Red Hat Developer Toolset: GCC to version 9.3.1 In addition, bug fix updates are available for the following components: binutils elfutils ltrace make strace SystemTap For detailed information on changes in 9.1, see the Red Hat Developer Toolset User Guide . 1.3.3. Changes in Perl The new rh-perl530 Software Collection includes Perl 5.30.1 , which provides a number of bug fixes and enhancements over the previously released rh-perl526 Software Collection. The new version also deprecates or removes certain language features. Notable changes with significant impact include: The Math::BigInt::CalcEmu , arybase , and B::Debug modules have been removed File descriptors are now opened with a close-on-exec flag Opening the same symbol as a file and as a directory handle is no longer allowed Subroutine attributes now must precede subroutine signatures The :locked and :uniq attributes have been removed Comma-less variable lists in formats are no longer allowed A bare << here-document operator is no longer allowed Certain formerly deprecated uses of an unescaped left brace ( { ) character in regular expression patterns are no longer permitted The AUTOLOAD() subroutine can no longer be inherited to non-method functions The sort pragma no longer allows specifying a sort algorithm The B::OP::terse() subroutine has been replaced by the B::Concise::b_terse() subroutine The File::Glob::glob() function has been replaced by the File::Glob::bsd_glob() function The dump() function now must be invoked fully qualified as CORE::dump() The yada-yada operator ( ... ) is a statement now, it cannot be used as an expression Assigning a non-zero value to the USD[ variable now returns a fatal error The USD* and USD# variables are no longer allowed Declaring variables using the my() function in a false condition branch is no longer allowed Using the sysread() and syswrite() functions on the :utf8 handles now returns a fatal error The pack() function no longer returns malformed UTF-8 format Unicode code points with a value greater than IV_MAX are no longer allowed Unicode 12.1 is now supported In addition, the rh-perl530 Software Collection now provides the Library for WWW in Perl (LWP) and other HTTP-related modules in the rh-perl530-perl-libwww-perl and rh-perl530-perl-LWP-Protocol-https RPM packages. For detailed changes between Perl 5.26 and Perl 5.30.1 , see the upstream change log for versions 5.28.0 , 5.30.0 , and 5.30.1 . 1.3.4. Changes in Python The new rh-python38 Software Collection introduces Python 3.8.0 . Notable enhancements compared to Python 3.6 include: New Python modules, for example, contextvars , dataclasses , or importlib.resources New language features, such as assignment expressions (the so-called walrus operator, := ) or positional-only parameters Improved developer experience with the breakpoint() built-in function, the = format string specification, and compatibility between debug and non-debug builds of Python and extension modules Performance improvements Improved support for optional static type hints An addition of the = specifier to formatted string literals (f-strings) for easier debugging Updated versions of packages, such as pip , requests , or Cython For detailed changes, see the upstream documentation . Note that similarly to the previously released Python Software Collections, the rh-python38 Software Collection does not include the same binary bindings to system tools (RPM, DNF, SELinux, and others) that are provided for the base RHEL 7 version of Python . 1.3.5. Changes in Ruby The new rh-ruby27 Software Collection provides Ruby 2.7.1 , which introduces a number of performance improvements, bug and security fixes, and new features. Notable enhancements include: A new Compaction Garbage Collector (GC) has been introduced, which can defragment a fragmented memory space. A new rubygem-racc package has been added. Ruby yet Another Compiler-Compiler (Racc) now provides a command-line interface for the one-token Look-Ahead Left-to-Right - LALR(1) - parser generator. Interactive Ruby Shell ( irb ), the bundled Read-Eval-Print Loop (REPL) environment, now supports multi-line editing. Pattern matching, frequently used in functional programming languages, has been introduced as an experimental feature. Numbered parameter as the default block parameter has been introduced as an experimental feature. The following performance improvements have been implemented: Fiber cache strategy has been changed to accelerate fiber creation. Performance of the CGI.escapeHTML method has been improved. Performance of the Monitor class and MonitorMixin module has been improved. In addition, automatic conversion of keyword arguments and positional arguments has been deprecated. In Ruby 3.0, positional arguments and keyword arguments will be separated. For more information, see the upstream documentation . To suppress warnings against experimental features, use the -W:no-experimental command-line option. To disable a deprecation warning, use the -W:no-deprecated command-line option or add Warning[:deprecated] = false to your code. For more information about changes in Ruby 2.7, see the upstream announcement for versions 2.7.0 and 2.7.1 . 1.3.6. Changes in Apache httpd The mod_md module of the httpd24 Software Collection has been updated to version 2.0.8. This update adds a number of features, notably support for version 2 of the Automatic Certificate Management Environment (ACME) certificate issuance and management protocol, which is the Internet Engineering Task Force (IETF) standard (RFC 8555). The original ACMEv1 protocol remains supported but is deprecated by popular service providers. In addition, a security fix for CVE-2019-10098 in the mod_rewrite module is now available. 1.3.7. Changes in Varnish Cache The rh-varnish6 Software Collection has been updated to version 6.0.6. This release includes numerous bug and security fixes and various minor enhancements. For detailed changes in Varnish Cache 6.0.6 since the Red Hat Software Collections release, see the upstream change log for versions 6.0.3 , 6.0.4 , 6.0.5 , and 6.0.6 . 1.3.8. Changes in JDK Mission Control JDK Mission Control, provided by the rh-jmc Software Collection, has been updated to version 7.1.1. This update includes numerous bug fixes and enhancements, including: Multiple rule optimizations A new JOverflow view based on Standard Widget Toolkit (SWT) A new flame graph view A new way of latency visualization using the High Dynamic Range (HDR) Histogram 1.3.9. Changes in HAProxy The rh-haproxy18 Software Collection has been updated to version 1.8.24 to provide multiple bug and security fixes. 1.4. Compatibility Information Red Hat Software Collections 3.5 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, 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 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: 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: 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, 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-python35 , rh-python36 components, BZ# 1499990 The pytz module, which is used by Babel for time zone support, is not included in the 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, 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. 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. postgresql component The rh-postgresql9* 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 , php , python , ruby , and ror components, BZ# 1072319 When uninstalling the httpd24 , rh-mariadb* , rh-mongodb* , rh-mysql* , rh-nodejs* , rh-perl* , rh-php* , python27 , rh-python* , rh-ruby* , or rh-ror* 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 , mongodb components Red Hat Software Collections contains the MySQL 5.7 , MySQL 8.0 , MariaDB 10.2 , MariaDB 10.3 , PostgreSQL 9.6 , PostgreSQL 10 , PostgreSQL 12 , 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/ . 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: 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: Installing packages from PHP Extension and Application Repository (PEAR) on a read-only NFS using the pear command fails with the error message: 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 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: instead of 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 ). 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 .

Commands:
superclass mismatch for class Mark (TypeError)
gem 'psych' require 'psych' Gem.load_yaml
[mysqld] character-set-server=utf8
ERROR: While executing gem ... (Errno::EROFS) Read-only file system @ dir_s_mkdir - /opt/rh/rh-ruby22/root/usr/local/share/gems
Read-only file system: '/opt/rh/rh-python34/root/usr/lib/python3.4/site-packages/ipython-3.1.0.dist-info'
Cannot install, php_dir for channel "pear.php.net" is not writeable by the current user
su -l postgres -c "scl enable rh-postgresql94 psql"
scl enable rh-postgresql94 bash su -l postgres -c psql