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Configuration Management Tools
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Juanje Ojeda
March 05, 2014
Programming
0
120
Configuration Management Tools
Very basic introduction to the Configuration Management Tools for the group Las Palmas DevOps.
Juanje Ojeda
March 05, 2014
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Transcript
SCM Software Configuration Management
Captain Obvious alert!
This is why... Let’s talk about the basics
what are Software Configurations ?
The system behavior Hardware configurations System configurations Applications settings Organization
policies
Configurations ≈ Policies The port 80 must be open The
user X must have access MySQL database must be running Ping must be blocked
what does Software Configurations look like?
Configurations
Configurations
Configurations
Configurations
Configurations
Configurations
Configurations
Configurations
what is a SCM system?
SCM Systems Provisioning Change management
SCM on Modern Systems
From 1 machine to many
Working on the wrong server
From 1 sysadmin to many
Who did what?
What do we need? All changes documented All changes must
be repeatable All changes in one place Accesibles for anyone All changes must be traceable
What does traceable mean? What have been changed? When have
been changed? Who made the change?
What do we do? Configuration by hand Wiki One or
few scripts Better scripts + Wiki Better scripts + Git/Svn Custom SCM (script+git+ssh loop)
How is a modern SCM? Declarative Abstract Idempotent Convergent
How is a modern SCM? Declarative Abstract Idempotent Convergent What
NOT How
How is a modern SCM? Declarative Abstract Idempotent Convergent How
it should behave Rely on the tool for the implementation
How is a modern SCM? Declarative Abstract Idempotent Convergent Only
take action if it’s needed
How is a modern SCM? Declarative Abstract Idempotent Convergent Each
resource takes care of itself
Key concepts Modern SCM
Modern SCM’s concepts Resources Nodes/Minions Recipes/Manifests/Playbooks Inventory Roles/Profiles
Some extras do we have time?
Avoid manual processes They are error prone
None
But be careful ;-)
Make Apps SCM friendly Separate data from code Allow to
use ENV variables Set default options But allow overwrite them with conffiles
Do NOT hardcode settings!!! Ever!
Make Apps SCM friendly Use the dependency managers Composer Bundler
Pip npm Maven
Make Apps SCM friendly Use flags to activate features Use
standard formats Think about settings per environment
Recomendations Start small Think in policies not in manual changes
Use Vagrant for developing policies
Recomendations
Popular SCMs CFEngine Puppet Chef Ansible
SCM vs Deploy Tools Debate