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Software Collections on CentOSSoftware Collections on CentOS

Joe BrockmeierJoe Brockmeierjzb@redhat.comjzb@redhat.comTwitter: @jzbTwitter: @jzbhttp://dissociatedpress.net/http://dissociatedpress.net/Principal Cloud & Storage AnalystPrincipal Cloud & Storage Analyst

Open Source and Standards (OSAS) at Red HatOpen Source and Standards (OSAS) at Red Hat

http://community.redhat.com/http://community.redhat.com/

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Who's this guy?Who's this guy?

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The Whats, Whys, and Hows of SCLsThe Whats, Whys, and Hows of SCLs

● The Packaging Problem We FaceThe Packaging Problem We Face

● What are Software Collections?What are Software Collections?

● Why, and when, to choose SCLs over other Why, and when, to choose SCLs over other solutions?solutions?

● How do I use SCLs?How do I use SCLs?

● Coming Soon... Coming Soon...

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In the Beginning...In the Beginning...

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Distributions as the Distributions as the Center of the UniverseCenter of the Universe

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Developers do not want to be Developers do not want to be limited to system versions of limited to system versions of

softwaresoftware

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Containers, PaaS, and Software Containers, PaaS, and Software Collections... Oh MyCollections... Oh My

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Let's talk about Software CollectionsLet's talk about Software Collections

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Do not require changes to RPMDo not require changes to RPM

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Software Collections areSoftware Collections are not not just a just a different version packaged for your OSdifferent version packaged for your OS

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Do not overwrite system filesDo not overwrite system files

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Example: PHP 5.4

On CentOS 6.xOn CentOS 6.x

PHP 5.4 package isPHP 5.4 package is php54

This pulls in:This pulls in:

php54­php­cli.x86_64

php54­php­common.x86_64

php54­php­pear.noarch

php54­php­process.x86_64

php54­php­xml.x86_64

php54­runtime.x86_64

Lives in:Lives in: /opt/rh/php54/root

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Avoid conflicts with system filesAvoid conflicts with system files

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Require Require minorminor changes to your changes to your existing spec filesexisting spec files

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Do not conflict with updates on your Do not conflict with updates on your systemsystem

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Nifty: Nifty: CanCan depend on other SCLs depend on other SCLs

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Let's talk about using SCLsLet's talk about using SCLs

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Software Collections CurrentlySoftware Collections Currently

● Red Hat Software Collections went GA on 12 Sept 2013

● CentOS announced SCLs 19 February 2014

● Fedora has SCLs on Fedora Hosted since 2013:

https://fedorahosted.org/SoftwareCollections/

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What's Packaged for Software CollectionsWhat's Packaged for Software Collections

● Ruby 1.9.3

● Python 2.7

● Python 3.3

● PHP 5.4

● Perl 5.16.3

● Tech preview Node.js 0.10

● MariaDB 5.5

● MySQL 5.5

● PostgreSQL 9.2

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Getting StartedGetting Started

● Assuming using a SLC with CentOS● yum install centos­release­SCL

● yum install php54 (or whatever...)

● scl enable php54 “application ­­option”

● Your application now uses PHP 5.4 ... the rest of the system ignores it.

● Python & Django with SCL (by Langdon White):● http://red.ht/scldjango

● Find packages for CentOS here: http://mirror.metrocast.net/centos/6.5/SCL/x86_64/

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Packaging SCLs

● Grab the necessary packages (CentOS or Grab the necessary packages (CentOS or Fedora or RHEL 6.5):Fedora or RHEL 6.5): yum install scl­utils scl­utils­build

● Instructions on converting an existing Instructions on converting an existing package:package: http://bit.ly/scl­spec­file

● For Conversion: For Conversion: spec2sclspec2scl

● General instructions on packaging SCLs:General instructions on packaging SCLs: http://bit.ly/pkging­scls

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Coming SoonComing Soon

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What will SoftwareCollections.org be?

● Upstream community for development of SCLs.

● Build and hosting services for collections.

● Resources (documentation, forums, mailing lists) for developers/packagers.

● An index of packaged software for users of CentOS, Fedora, RHEL, and other RPM-based distributions.

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The Lifecycle of Collections

● SCLs can be used to provide newer software support on older releases, or (going forward) to provide legacy support on newer releases:

● Example: Application using Ruby on Rails N deployed on CentOS 6, via SCL. Same application deployed on CentOS 7 (when released) using SCL.

● OpenShift leverages SCLs for its cartridges using RHEL supported and non-supported components.

● SCLs can be used inside Docker containers to simplify container deployment.

Thanks!Thanks!

Joe BrockmeierJoe Brockmeierjzb@redhat.comjzb@redhat.comTwitter: @jzbTwitter: @jzb