homelab-nomad/traefik/traefik.nomad

variable "consul_address" {
  type = string
  description = "Full address of Consul instance to get catalog from"
  default = "http://127.0.0.1:5400"
}

variable "base_hostname" {
  type = string
  description = "Base hostname to serve content from"
  default = "dev.homelab"
}

job "traefik" {
  datacenters = ["dc1"]
  type = "system"
  priority = 100

  constraint {
    attribute = "${node.class}"
    value = "ingress"
  }

  update {
    max_parallel = 1
    auto_revert = true
  }

  group "traefik" {

    network  {
      port "web" {
        static = 80
      }
      port "websecure" {
        static = 443
      }
    }

    service {
      name = "traefik"
      port = "web"

      check {
        type = "http"
        path = "/ping"
        port = "web"
        interval = "10s"
        timeout = "2s"
      }

      connect {
        native = true
      }

      tags = [
        "traefik.enable=true",
        "traefik.http.routers.traefik_dashboard.entryPoints=websecure",
        "traefik.http.routers.traefik_dashboard.rule=Host(`traefik.${var.base_hostname}`)",
        "traefik.http.routers.traefik_dashboard.service=api@internal",
        "traefik.http.routers.traefik_dashboard.tls=true",
      ]
    }

    task "traefik" {
      driver = "docker"

      config {
        image = "traefik:2.6"

        ports = ["web", "websecure"]
        network_mode = "host"

        mount {
          type = "bind"
          target = "/etc/traefik"
          source = "config"
        }
      }

      template {
        # Avoid conflict with TOML lists [[ ]] and Go templates {{ }}
        left_delimiter = "<<"
        right_delimiter = ">>"
        data = <<EOH
[log]
  level = "DEBUG"

[entryPoints]
  [entryPoints.web]
    address = ":80"
    [entryPoints.web.http]
      [entryPoints.web.http.redirections]
        [entryPoints.web.http.redirections.entrypoint]
          to = "websecure"
          scheme = "https"

  [entryPoints.websecure]
    address = ":443"
    [entryPoints.websecure.http.tls]
      # certResolver = "letsEncrypt"

  [entryPoints.metrics]
    address = ":8989"

[api]
  dashboard = true

[ping]
  entrypoint = "web"

[metrics]
  [metrics.prometheus]
    entrypoint = "metrics"
    # manualRouting = true

[providers.file]
  directory = "/etc/traefik/conf"
  watch = true

[providers.consulCatalog]
  connectAware = true
  connectByDefault = true
  exposedByDefault = false
  defaultRule = "Host(`{{normalize .Name}}.${var.base_hostname}`)"
  [providers.consulCatalog.endpoint]
    address = "http://<< env "CONSUL_HTTP_ADDR" >>"
        EOH
        destination = "/config/traefik.toml"
      }

      template {
        # Avoid conflict with TOML lists [[ ]] and Go templates {{ }}
        left_delimiter = "<<"
        right_delimiter = ">>"
        data = <<EOH
[http]
  [http.routers]
    [http.routers.nomad]
      entryPoints = ["websecure"]
      # middlewares = []
      service = "nomad"
      rule = "Host(`nomad.${var.base_hostname}`)"
    [http.routers.consul]
      entryPoints = ["websecure"]
      # middlewares = []
      service = "consul"
      rule = "Host(`consul.${var.base_hostname}`)"
    [http.routers.vault]
      entryPoints = ["websecure"]
      # middlewares = []
      service = "vault"
      rule = "Host(`vault.${var.base_hostname}`)"

  [http.services]
    << with service "nomad-client" ->>
    [http.services.nomad]
      [http.services.nomad.loadBalancer]
        << range . ->>
        [[http.services.nomad.loadBalancer.servers]]
          url = "http://<< .Address >>:<< .Port >>"
        << end >>
    <<- end >>
    << with service "consul" ->>
    [http.services.consul]
      [http.services.consul.loadBalancer]
        << range . ->>
        [[http.services.consul.loadBalancer.servers]]
          # Not using .Port because that's an RPC port
          url = "http://<< .Address >>:8500"
        << end >>
    <<- end >>
    << with service "vault" ->>
    [http.services.vault]
      [http.services.vault.loadBalancer]
        << range . ->>
        [[http.services.vault.loadBalancer.servers]]
          url = "http://<< .Address >>:<< .Port >>"
        << end >>
    <<- end >>
        EOH
        destination = "/config/conf/route-hashi.toml"
        change_mode = "noop"
      }

      resources {
        cpu = 100
        memory = 100
        memory_max = 200
      }
    }
  }
}