homelab-nomad/service.nomad

# Vars
# name = string*
# image = string*
# service_port = int
# ingress = bool
# sticky_disk = bool
# args = json(list[str])
# resources = dict(cpu = int, mem = int)
# templates = json(list(dict(
#   data = str,
#   dest = str,
#   change_mode = str,
#   change_signal = str,
#   left_delimiter = str,
#   right_delimiter = str,
# )))
# healthcheck = "/"
# mysql = bool
# redis = bool
job "[[.name]]" {
  region = "global"
  datacenters = ["dc1"]

  type = "service"

  group "[[.name]]" {
    [[ with .count ]]count = [[ . ]][[end]]
    network {
      mode = "bridge"
      [[ if not (empty .service_port) ]]
      port "main" {
        [[ if default false .ingress ]]
        host_network = "loopback"
        [[ end ]]
        to = [[.service_port]]
      }
      [[ end ]]
    }

    [[ if default false .sticky_disk ]]
    ephemeral_disk {
      migrate = true
      sticky = true
    }
    [[ end ]]

    [[ if not (empty .service_port) ]]
    service {
      name = "[[.name | replace "_" "-"]]"
      port = "main"

      [[ if default false .ingress ]]
      connect {
        sidecar_service {
          proxy {
            local_service_port = [[.service_port]]
            [[ if default false .mysql ]]
            upstreams {
              destination_name = "mysql-server"
              local_bind_port = 4040
            }
            [[ end -]]
            [[ if default false .redis ]]
            upstreams {
              destination_name = "redis"
              local_bind_port = 6379
            }
            [[ end ]]
          }
        }

        sidecar_task {
          resources {
            cpu    = 50
            memory = 50
          }
        }
      }
      [[ end ]]

      check {
        type = "http"
        path = "[[ or .healthcheck "/" ]]"
        port = "main"
        interval = "10s"
        timeout = "10s"
      }

      tags = [
        [[ if default false .ingress -]]
        "traefik.enable=true",
        "traefik.http.routers.[[.name]].entryPoints=websecure",
        [[ end -]]
      ]
    }
    [[ end ]]

    task "[[.name]]" {
      driver = "docker"

      config {
        image = "[[.image]]"
        [[ if not (empty .service_port) -]]
        ports = ["main"]
        [[- end ]]
        [[ if not (empty .args) -]]
        args = ["[[ .args | parseJSON | join `", "` ]]"]
        [[- end ]]

        [[ with .templates]]
        [[ range $t := . | parseJSON ]]
        mount {
          type = "bind"
          target = "[[ $t.dest ]]"
          source = "local/[[ $t.dest ]]"
        }
        [[ end ]]
        [[ end ]]
      }

      [[ with .env -]]
      env = {
        [[- range $k, $v := . ]]
        "[[$k]]" = "[[$v]]"
        [[- end ]]
      }
      [[ end ]]

      [[ with .templates ]]
      [[ range $t :=  . | parseJSON ]]
      template {
        data = <<EOF
[[ $t.data ]]
EOF
        destination = "local/[[ $t.dest ]]"
        [[ with $t.left_delimiter ]]left_delimiter = "[[ . ]]"[[ end -]]
        [[ with $t.right_delimiter ]]right_delimiter = "[[ . ]]"[[ end -]]
        [[ with $t.change_mode ]]change_mode = "[[ . ]]"[[ end -]]
        [[ with $t.change_signal ]]change_signal = "[[ . ]]"[[ end -]]
        [[ with $t.env ]]env = [[ . ]][[ end ]]
      }
      [[ end ]]
      [[ end ]]

      [[ with .resources ]]
      resources {
        cpu = [[ .cpu ]]
        memory = [[ .memory ]]
      }
      [[ end ]]
    }
  }
}