capistrano-nomad

gem "capistrano-nomad"

require "capistrano/nomad"
install_plugin Capistrano::Nomad

set :nomad_jobs_path, "nomad/jobs"
set :nomad_var_files_path, "nomad/vars"

# Determines base URL to use when opening job in web UI 
set :nomad_ui_url, "http://localhost:4646"

# Make variables available to all template .erb files
set :nomad_template_vars, (lambda do
  {
    env_name: fetch(:stage).to_sym,
    domain: fetch(:domain),
    foo: "bar,"
  }
end)

# Change docker build command
set :nomad_docker_build_command, (lambda do
  "docker buildx build"
end)

# Pass additional options into `docker build`
set :nomad_docker_build_command_options, (lambda do
  [
    "--cache-to type=gha",
    "--cache-from type=gha",
  ]
end)

# Make helpers available to all template .erb files
nomad_template_helpers do
  def restart_stanza(interval = "1m")
    <<-EOF
      restart {
        interval = "#{interval}"
        attempts = 3
        mode = "delay"
      }
    EOF
  end
end

# Use hosted Docker image
nomad_docker_image_type :postgres,
  alias: "postgres:5.0.0"

# Use Docker image that will be built locally relative to project and push
nomad_docker_image_type :backend,
  path: "local/path/backend",
  alias: ->(image_type:) { "gcr.io/axsuul/#{image_type}" },
  target: "release",
  build_args: { foo: "bar" }

# Use Docker image that will be built locally from an absolute path and push
nomad_docker_image_type :redis,
  path: "/absolute/path/redis",
  alias: "gcr.io/axsuul/redis"

# Use Docker image that will be built remotely on server
nomad_docker_image_type :restic,
  path: "containers/restic",
  alias: "my-project/restic:local",
  strategy: :remote_build

# Jobs
nomad_job :backend, docker_image_types: [:backend], var_files: [:rails]
nomad_job :frontend
nomad_job :postgres, docker_image_types: [:postgres]
nomad_job :redis, docker_image_types: [:redis], tags: [:redis]
nomad_job :"traefik-default", template: :admin,
  erb_vars: { role: :default },
  tags: [:traefik]
nomad_job :"traefik-secondary", template: :admin,
  erb_vars: { role: :secondary },
  tags: [:traefik]

nomad_namespace :analytics, tags: [:admin] do
  nomad_job :grafana
end

nomad_namespace :maintenance, path: "maintenance-stuff" do
  nomad_job :garbage_collection
end