Nomad Jobspec Canary Release Manager

// The waypoint.hcl file
release {
  use "nomad-jobspec-canary" {
    groups = [
      "app"
    ]
  }
}

// The app.nomad.tpl file
job "web" {
  datacenters = ["dc1"]

  group "app" {
    network {
      mode = "bridge"
      port "http" {
        to = 80
      }
    }

    // Setting a canary in the update stanza indicates a canary deployment
    update {
      max_parallel = 1
      canary       = 1
      auto_revert  = true
      auto_promote = false
      health_check = "task_states"
    }

    service {
      name = "app"
      port = 80
      connect {
        sidecar_service {}
      }
    }

    task "app" {
      driver = "docker"
      config {
        image = "${artifact.image}:${artifact.tag}"
        ports  = ["http"]
      }

      env {
        %{ for k,v in entrypoint.env ~}
        ${k} = "${v}"
        %{ endfor ~}

        // Ensure we set PORT for the URL service. This is only necessary
        // if we want the URL service to function.
        PORT = 80
      }
    }
  }

  group "app-gateway" {
    network {
      mode = "bridge"
      port "inbound" {
        static = 8080
        to     = 8080
      }
    }

    service {
      name = "gateway"
      port = "8080"

      connect {
        gateway {
          proxy {}

          ingress {
            listener {
              port = 8080
              protocol = "http"
              service {
                name  = "app"
                hosts = [ "*" ]
              }
            }
          }
        }
      }
    }
  }
  meta = {
    // Ensure we set meta for Waypoint to detect the release URL
    "waypoint.hashicorp.com/release_url" = "http://app.ingress.dc1.consul:8080"
  }
}