Sidekiq Redeploy

The sidekiq-redeploy gem is a sidekiq launcher that allows you to redeploy a new version of your Ruby application in a container without a full container deploy.

Key Points:

• Encourages the separation of the build process from deployment
• Deploys in seconds
• Pluggable handlers to detect redeploy (File, S3, Artifactory, etc..)

Example application can be found here See related puma-redeploy gem

Installation

Add this line to your application's Gemfile:

gem 'sidekiq-redeploy'

And then execute:

$ bundle install

Or install it yourself as:

$ gem install sidekiq-redeploy

Usage

The sidekiq-loader is a cli used to start Sidekiq in a child process and monitor for application updates.

Usage: sidekiq-loader [options]
    -a, --app-dir=DIR                [Required] Location of application directory.
    -w, --watch=WATCH                [Required] Location of watch file (file or s3 location).
    -y, --watch-delay INTEGER        [Optional] Specify the number of seconds between checking watch file. Defaults to 30.
    -d, --[no-]deploy  [FLAG]        [Optional] Deploy archive on app startup. Defaults to true.
    -s, --sidekiq-app [PATH|DIR]     [Optional] Location of application to pass to sidekiq.
    -n, --num-procs INTEGER          [Optional] Specify the number of sidekiq processes to create. Defaults to 1.

The watch file can contain an optional list of commands to run and the required archive_location. The archive_location can be a file path or S3 URL For example when using a file:

---
commands:
  - bundle 
archive_location: /app/pkg/test_app_0.0.3.zip

For example when using S3:

---
commands:
  - bundle 
archive_location: s3://puma-test-app-archives/test_app_0.0.3.zip

For example this will start the launcher using a S3 yaml watch file.

bundle exec sidekiq-loader -a /app -w s3://puma-test-app-archives/watch.yml

For example this will start the launcher using a local yaml watch file.

bundle exec sidekiq-loader -a ./ -s ./lib/sidekiq_server.rb -w build/pkg/watch.yml

In the example above the watch.me contents would look like the following. In this case the test_app_0.0.3.zip must exist in the puma-test-app-archives S3 bucket.

s3://puma-test-app-archives/test_app_0.0.3.zip

You can optionally use the -s option to specify the application file for sidekiq to run. This is useful when running a Sinatra app.

bundle exec sidekiq-loader -a /app -w s3://puma-test-app-archives/watch.me -s ./app.rb

Signals

Signals can be used to send commands to the sidekiq-loader. The following signals are supported. Also see https://github.com/sidekiq/sidekiq/wiki/Signals.

For example you can shell into your container and issue a signal using the kill command.

kill -USR2 pid

• USR2 - This signal will trigger a restart of the Sidekiq process. The Sidekiq process will be first issues a TSTP quiet signal, and then a TERM signal. This is useful in a non-production environment if you want to shell into the container, modify code, and the restart Sidekiq.
• TERM,INT - This signal will first issue a TERM signal to Sidekiq (giving it time to shutdown), and then shutdown sidekiq-loader.
• TTIN - This signal will be sent to Sidekiq which will print backtraces for all threads to STDOUT.

Development

After checking out the repo, run bundle to install dependencies. Then, run rake spec to run the tests and rake rubocop to check for rubocop offences.

To install this gem onto your local machine, run the following. Note - You must add any new files to git first.

bundle exec rake install
sidekiq-redeploy 0.1.0 built to pkg/sidekiq-redeploy-0.1.0.gem.
sidekiq-redeploy (0.1.0) installed.

To release a new version, update the version number in version.rb, and then run the Release GitHub action.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/tbeauvais/sidekiq-redeploy. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Sidekiq::Redeploy project's codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.