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choregraphie (13) Versions 0.7.2

Allow to coordinate changes induced by chef

Berkshelf/Librarian
Policyfile
Knife
cookbook 'choregraphie', '= 0.7.2'
cookbook 'choregraphie', '= 0.7.2', :supermarket
knife cookbook site install choregraphie
knife cookbook site download choregraphie
README
Dependencies
Quality

choregraphie

choregraphie is French for choreography.

Build Status

Concepts

A protected resource is a resource whose convergence can induce downtime on the service. For instance, service[mydatabase] is usually a resource to protect.

A choregraphie describes actions which operate on some chef events. It allows, for instance, to run an action before and after the convergence of a resource (currently: after means at the end of a sucessful run).

A primitive is a helper for common idioms in choregraphies. Examples: grabbing a lock, silencing the monitoring, executing a shell command.

Example

choregraphie 'my elasticsearch' do
  # protect against service and network restart
  on 'service[mydatase]'
  on 'service[network]'

  # protect against all reboot resources
  on /^reboot\[/

  on :weighted_resources # compatiblity with resource-weight cookbook

  # built-in primitive
  consul_lock(path: 'choregraphie/locks/myes', concurrency: 2)

  before do
    # roll your own code
    downtime_in_monitoring
  end
end

Support

Only chef >= 12.6 is supported (due to a dependency on :before notifications).

Usage of compat_resource cookbook is highly discouraged as it modifies chef behavior and has silently broken :before notification in the past which are the foundation of choregraphie. Branch 'criteo' in criteo-forks organization is a safely patched version of this cookbook to avoid any chef monkeypatching.

Choregraphies can be applied only on resources that support whyrun (currently chef default resources and resource/provider style). Custom resources (the whole resource defined in the resources/ directory) are not supported at the moment (see https://github.com/chef/chef/issues/4537 for a discussion).

Available Primitives

See the code for up-to-date information.

Two very basic primitives:

  • Before: before { ... } will execute code before protected resources are converged. The block will receive the converged resource as argument.
  • Cleanup: cleanup { ... } will execute code at the end of a successful chef-client run. The cleanup block will be executed at each chef-client run. This code should thus be efficient and safe to run at the end of all chef-client runs (for instance cleaning a file only if it exists).

Slightly more advanced primitives: * CheckFile: check_file '/tmp/do_it' will wait until the given file exists on the filesystem. This file is cleaned after. * WaitUntil: wait_until "ping -c 1 google.com" will wait until the command exit with a 0 status. This primitives supports string, mixlib/shellout instance and blocks. One can specify to run the wait_until in "before" or "cleanup" stages using the options (see code for details) * ConsulLock: consul_lock {path: '/lock/my_app', id: 'my_node', concurrency: 5} will grab a lock from consul and release it afterwards. This primitive is based on optimistic concurrency rather than consul sessions. * ConsulMaintenance: consul_maintenance reason: 'My reason' will enable maintenance mode on the consul agent before the choregraphie starts.

Missing Primitives

Write your own, it is easy.

How to write a primitive

You should have a look at the example primitives such as check_file.

Primitives can implement two callbacks: before and cleanup. See primitives section above for more details.

Dependent cookbooks

resource-weight >= 0.0.0

Contingent cookbooks

There are no cookbooks that are contingent upon this one.

Collaborator Number Metric
            

0.7.2 failed this metric

Failure: Cookbook has 1 collaborators. A cookbook must have at least 2 collaborators to pass this metric.

Foodcritic Metric
            

0.7.2 passed this metric

License Metric
            

0.7.2 failed this metric

choregraphie does not have a valid open source license.
Acceptable licenses include Apache 2.0, apachev2, MIT, mit, GNU Public License 2.0, gplv2, GNU Public License 3.0, gplv3.

Publish Metric
            

0.7.2 passed this metric