AutoCanary24
AutoCanary24 is a ruby utility to do blue/green and canary deployments with AWS CloudFormation stacks.
This library use the Swap AutoScaling Groups approach and expects two stacks. A "base" stack which includes at least the ELB
and another which includes the AutoScaling Group
.
Installation
Add this line to your application's Gemfile:
gem 'autocanary24'
And then execute:
$ bundle install
Or install it yourself as:
$ gem install autocanary24
Usage
Prerequisite: Deploy the base stack before
Initialize the client, e.g. in your Rakefile
and deploy your stack:
# Configure the AutoCanary24 Client
ac = AutoCanary24::Client.new({
keep_inactive_stack: false,
keep_instances_balanced: false,
scaling_instance_percent: 50
})
The available configuration:
keep_inactive_stack
: Iftrue
the inactive stack gets not deleted. Default isfalse
keep_instances_balanced
: Iftrue
a instance from current stack gets removed whenever a new instance from the new stack is added. Iffalse
first all new instances are created and afterwards the old instances gets removed. Default isfalse
scaling_instance_percent
: Percent of instances which are added at once (depends on the actual number of instances, read from desired). Default is100
wait_timeout
: Timeout in seconds to wait for checking AWS operations are done before do a rollback. Default is300
# Execute the deployment
ac.deploy_stack(parent_stack_name, template, parameters, tags, deployment_check)
The available parameters:
parent_stack_name
: the name of the 'base' stack. In additionAutoStacker24
will read the output parameters of an existing stack and merge them to the given parameters.template
: is either the template json data itself or the name of a file containing the template bodyparameters
: specify the input parameter as a simple ruby hash. It gets converted to the cumbersome AWS format automatically. The template body will be validated and optionally preprocessed.tags
: Optional. Key-value pairs to associate with this stack.deployment_check
: Optional. Alambda
which is executed whenever new instances are added to the ELB. Iftrue
AutoCanary continues, iffalse
it will rollback to the current stack.
For more information about stacked CloudFormation stacks visit AutoStacker24.
Examples
Have a look into the examples subfolder
Development
After checking out the repo, run bin/setup
to install dependencies. Then, run rake spec
to run the tests. You can also run bin/console
for an interactive prompt that will allow you to experiment.
To install this gem onto your local machine, run bundle exec rake install
. To release a new version, update the version number in version.rb
, and then run bundle exec rake release
, which will create a git tag for the version, push git commits and tags, and push the .gem
file to rubygems.org.
Contributing
Bug reports and pull requests are welcome on GitHub at https://github.com/autoscout24/autocanary24.
License
The gem is available as open source under the terms of the MIT License.