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Simple Capistrano deploy for a Docker-managed app
# be sure to comment out the require 'capistrano/deploy' line in your Capfile!
# config valid only for Capistrano 3.1
lock '3.2.1'
set :application, 'my-cool-application'
# the base docker repo reference
set :name, "johns-stuff/#{fetch(:application)}"
# i have a docker registry running on a remote machine.
set :remote_repo, "registry.from.dev.machine:5000/#{fetch(:name)}"
set :local_repo, "registry.from.install.machine:5000/#{fetch(:name)}"
desc 'Build Docker images'
task :build do
# do you app pre-deploy stuff here. i use gulp, so...
system "gulp build"
# build the actual docker image, tagging the push for the remote repo
system "docker build -t #{fetch(:remote_repo)} ."
end
desc 'Push Docker images'
task :push do
system "docker push #{fetch(:remote_repo)}"
end
desc 'go'
task :go => ['build', 'push', 'deploy']
desc 'deploy'
task :deploy do
on roles(:app) do
execute "docker pull #{fetch(:local_repo)}"
Rake::Task['deploy:restart'].invoke
end
end
namespace :deploy do
task :restart do
on roles(:app) do
# in case the app isn't running on the other end
execute "docker stop #{fetch(:application)} ; true"
# have to remove it otherwise --restart=always will run it again on reboot!
execute "docker rm #{fetch(:application)} ; true"
# modify this to suit how you want to run your app
execute "docker run -d -p 3000:3000 --restart=always --name=#{fetch(:application)} #{fetch(:local_repo)}"
end
end
end
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