Capistrano::Dockerbuild

Capistrano tasks for docker build on remote server.

These tasks depends on Git. And so remote server must have git command.

Installation

Add this line to your application's Gemfile:

gem 'capistrano-dockerbuild'

And then execute:

$ bundle

Or install it yourself as:

$ gem install capistrano-dockerbuild

Usage

Add require and install_plugin to Capfile.

require 'capistrano/dockerbuild'
install_plugin Capistrano::Dockerbuild

Variables

Common Variables

Use common variables

• repo_url
• branch

name	required	default	desc
docker_build_server_host	yes	nil	Build server hostname or SSH::Host object
docker_build_base_dir	yes	nil	Repository clone to here, and execute build command here
docker_registry	no	nil	Docker registry hostname. if use DockerHub, keep nil
docker_build_cmd	no	-> { [:docker, "build", "-t", fetch(:docker_tag_full), "."] }	Execute command for image building
docker_repository_name	no	-> { fetch(:application) }	Use by docker tag {{docker_repository_name}}:tag
docker_tag	no	-> { fetch(:branch) }	Use by docker tag repository:{{docker_tag}}
docker_tag_full	no	-> { #{fetch(:docker_repository_name)}:#{fetch(:docker_tag)}" }	Use by docker tag {{docker_tag_full}}
docker_remote_repository_name	no	-> { fetch(:docker_repository_name) }	Use by docker push docker_registry/{{docker_remote_repository_name}}:docker_remote_tag
docker_remote_tag	no	-> { fetch(:docker_tag) }	Use by docker push docker_registry/docker_remote_repository_name:{{docker_remote_tag}}
docker_remote_tag_full	no	-> { "#{fetch(:docker_registry) &.+ "/"}#{fetch(:docker_remote_repository_name)}:#{fetch(:docker_remote_tag)}" }	Use by docker push {{docker_remote_tag_full}}
keep_docker_image_count	no	10

Tasks

docker:check

• Ensure #{docker_build_base_dir}
• Ensure git reachable

docker:clone

• Clone repo to #{docker_build_base_dir} as mirror

docker:update_mirror

• git remote update #{docker_build_base_dir}

docker:build

• Create #{branch} worktree to #{docker_tag}-#{timestamp}
• With in worktree dir, execute #{docker_build_cmd}
• Clear worktree

docker:push

• docker tag #{docker_tag_full} #{docker_remote_tag_full}
• docker push #{docker_remote_tag_full}

docker:cleanup_local_images

• Remove docker images
• Leave keep_docker_image_count images
• Remove from the oldest image

Task Dependency

docker:push => docker:build => docker:update_mirror => docker:clone => docker:check

Development

After checking out the repo, run bin/setup to install dependencies. 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/reproio/capistrano-dockerbuild.

License

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