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Deploy with Capistrano

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Henrique Gubert edited this page Nov 22, 2016 · 2 revisions

capistrano-rails will automatically migrate your database for you, but it will not create/migrate shards for you.

If you want to deploy a sharded application you can add the following task to your deploy recipe:

namespace :deploy do
  namespace :shards do
    desc 'Ensures all shards are created and migrated'
    task :ensure_created_and_migrated => [:set_rails_env] do
      on primary fetch(:migration_role) do
        within release_path do
          with rails_env: fetch(:rails_env) do
            info '[deploy:shards:ensure_created_and_migrated] Run `rake shards:create`'
            execute :rake, 'shards:create'
            info '[deploy:shards:ensure_created_and_migrated] Run `rake shards:migrate`'
            execute :rake, 'shards:migrate'
          end
        end
      end
    end
  end
  after 'deploy:updated', 'deploy:shards:ensure_created_and_migrated'
end

This task will create the non-existing shards for you, and migrate all shards of all groups on deploy.

You will also need to add your config/shards.yml to the list of linked files on you recipe, and remember to create the config file on your production server before the deploy.

set :linked_files, fetch(:linked_files, []).push('config/database.yml', 'config/secrets.yml', 'config/shards.yml')
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