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Software Collections Quickstart

August 8, 2013
Scott McCarty (fatherlinux)
Related topics:
Linux
Related products:
Red Hat Enterprise Linux

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    As I discussed in an article entitled Red Enterprise Linux Release Speed, developers sometimes have a problem with how slow Red Hat's Enterprise Linux releases new versions of software. Well, the good news is, Software Collections are here. Software Collections provide Red Hat Enterprise Linux users with newer versions of programming languages and server daemons like python, perl, ruby, php, mysql, mariadb, etc.

    This is a quick start guide to help you get comfortable with both programming languages and server daemons provided as software collections.

    Installation

    First, add the right channel to your system

    rhn-channel -u fatherlinux --add --channel=rhel-x86_64-server-6-rhscl-1-beta

    To discover what packages are available, do a quick list, and grep for rhscl.

    yum list available | grep rhscl
    mariadb55.x86_64                      1-6.el6               rhel-x86_64-server-6-rhscl-1-beta
    mariadb55-mariadb.x86_64              5.5.30-9.el6          rhel-x86_64-server-6-rhscl-1-beta
    mariadb55-mariadb-bench.x86_64        5.5.30-9.el6          rhel-x86_64-server-6-rhscl-1-beta
    mariadb55-mariadb-devel.x86_64        5.5.30-9.el6          rhel-x86_64-server-6-rhscl-1-beta
    mariadb55-mariadb-libs.x86_64         5.5.30-9.el6          rhel-x86_64-server-6-rhscl-1-beta
    mariadb55-mariadb-server.x86_64       5.5.30-9.el6          rhel-x86_64-server-6-rhscl-1-beta
    mariadb55-mariadb-test.x86_64         5.5.30-9.el6          rhel-x86_64-server-6-rhscl-1-beta
    ....

    Now, let's install a few interesting packages

    yum install python33-*
    yum install python27-*
    yum install mariadb55-mariadb-server

    Basic Usage & Testing

    To test python 3.3, let's fire up Idle, the built in editor

    scl enable python33 idle

    It's also easy to enable a software collection, for the duration of a shell session

    scl enable python27 bash

    Enabling Servers

    Servers provided by Software Collections are configured and used similar to normal system daemons. One important thing to note, is that with Software Collections, multiple servers that require the same port may be installed side by side, so care must be taken to determine which one is started by default. Historically, this is something that systems administrators did not have to frequently worry about.

    Before starting MariaDB, make sure that the system version of MySQL 5.1 is not installed or has been disabled.

    chkconfig --list mysqld
    mysqld         	0:off	1:off	2:off	3:off	4:off	5:off	6:off

    Now, start MariaDB. As things start, you will notice that everything happens in /opt. All of the MariaDB system tables are created in /opt and do not interfere with the system version of mysqld.

    chkconfig mariadb55-mysqld on
    /etc/init.d/mariadb55-mysqld start

    A few other important thing to note are; the logs and socket are placed in the system directories, so a standard MySQL client can and will connect by default.

    /var/lib/mysql/mysql.sock
    /var/log/mariadb55-mysqld.log

    Also, notice that the normal MySQL port is used and looks like a standard MySQL server daemon.

    netstat -anp | grep 3306
    tcp        0      0 0.0.0.0:3306                0.0.0.0:*                   LISTEN      21104/mysqld

    Integration

    Now, we are going to put Python 2.7 and MariaDb in action using SQLAlchemy. Enable both at the same time.

    scl enable python33 mariadb55 bash

    Notice that the binary is in /opt/rh. Also, notice that the version is correct.

    which mysql
    /opt/rh/mariadb55/root/usr/bin/mysql
    mysql --version
    mysql  Ver 15.1 Distrib 5.5.30-MariaDB, for Linux (x86_64) using readline 5.1

    A little bit of SQL Alchemy, and you can create a new database.

    >>> import sqlalchemy
    >>> print(sqlalchemy.__version__)
    0.7.9
    >>> engine = sqlalchemy.create_engine('mysql://root@localhost')
    >>> engine.execute("CREATE DATABASE test5")

    Finally, check that the database was created.

    mysql
    Welcome to the MariaDB monitor.  Commands end with ; or g.
    Your MariaDB connection id is 11
    Server version: 5.5.30-MariaDB MariaDB Server
    
    Copyright (c) 2000, 2013, Oracle, Monty Program Ab and others.
    
    Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
    
    MariaDB [(none)]> show databases;
    +--------------------+
    | Database           |
    +--------------------+
    | information_schema |
    | mysql              |
    | performance_schema |
    | test               |
    | test5              |
    +--------------------+
    5 rows in set (0.00 sec)
    Last updated: November 2, 2023

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