1. https://flic.kr/p/Lj3bW
Software Configuration Management

2. What SCM technologies have you learned?
Software Configuration Management (SCM) “Configuration management … is the discipline of identifying the configuration of a system at distinct points in time for the purpose of systematically controlling changes to the configuration and maintaining the integrity and traceability of the configuration throughout the system life cycle.” (SWEBOK)
What SCM technologies have you learned?

3. What configuration does each manage?
Git
Vagrant
RVM
Bundler

4. What configuration does each manage?
Git
Versions of your code
Vagrant
Development OS; various installed software
RVM
Ruby version; organizes gemsets
Bundler
Gem versions

5. Git for Your Code RVM & Bundler for External Dependencies
ruby
v1, v2, v3, …
RVM,
Bundler
Git
jquery
v1, v2, v3, …
Your code
v1, v2, v3, …
sqlite
v1, v2, v3, …

6. How do you choose versions with…
Vagrant
RVM
Bundler

7. How do you choose versions with…
Vagrant
Vagrantfile, provisioning script
RVM
Command line, Gemfile comments
Bundler
Gemfile

8. How does Git work with RVM and Bundler to achieve?
Recall SCM Definition… “Configuration management … is the discipline of identifying the configuration of a system at distinct points in time for the purpose of systematically controlling changes to the configuration and maintaining the integrity and traceability of the configuration throughout the system life cycle.” (SWEBOK)
How does Git work with RVM and Bundler to achieve?

9. Recall SCM Definition… “Configuration management … is the discipline of identifying the configuration of a system at distinct points in time for the purpose of systematically controlling changes to the configuration and maintaining the integrity and traceability of the configuration throughout the system life cycle.” (SWEBOK)
How does Git work with RVM and Bundler to achieve?
Gemfile versions are managed with code versions

10. Development Principles
Building project should be automatable & repeatable
Treat build scripts like code
Version control them!
Use tags to track milestones
Iterations, releases, bug fixes, etc.
Always know how to get code for, to build, and to run each past milestone
Hard without tools!