homelab-nomad/core/blocky/blocky.nomad

variable "config_data" {
  type = string
  description = "Plain text config file for blocky"
}

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

  update {
    max_parallel = 1
    # TODO: maybe switch to service job from system so we can use canary and autorollback
    # auto_revert = true
  }

  group "blocky" {

    network {
      mode = "bridge"

      port "dns" {
        static = "53"
      }

      port "api" {
        host_network = "wesher"
        to = "4000"
      }

      dns {
        # Set expclicit DNS servers because tasks, by default, use this task
        servers = ["1.1.1.1", "1.0.0.1"]
      }
    }

    service {
      name = "blocky-dns"
      provider = "nomad"
      port = "dns"
    }

    service {
      name = "blocky-api"
      provider = "nomad"
      port = "api"

      tags = [
        "prometheus.scrape",
        "traefik.enable=true",
        "traefik.http.routers.blocky-api.entryPoints=websecure",
      ]

      check {
        name     = "api-health"
        port     = "api"
        type     = "http"
        path     = "/"
        interval = "10s"
        timeout  = "3s"
      }
    }

    task "blocky" {
      driver = "docker"

      config {
        image = "ghcr.io/0xerr0r/blocky"
        args = ["-c", "${NOMAD_TASK_DIR}/config.yml"]
        ports = ["dns", "api"]
      }

      resources {
        cpu = 50
        memory = 50
        memory_max = 100
      }

      template {
        data = var.config_data
        destination = "${NOMAD_TASK_DIR}/config.yml"
        splay = "1m"

        wait {
          min = "10s"
          max = "20s"
        }
      }

      template {
        data = <<EOF
{{ range nomadServices }}
{{ range nomadService 1 (env "NOMAD_ALLOC_ID") .Name -}}
{{ .Address }} {{ .Name }}.nomad
{{- end }}
{{- end }}
        EOF
        destination = "${NOMAD_TASK_DIR}/nomad.hosts"
        change_mode = "noop"

        wait {
          min = "10s"
          max = "20s"
        }
      }
    }

    task "stunnel" {
      driver = "docker"

      lifecycle {
        hook = "prestart"
        sidecar = true
      }

      config {
        image = "alpine:3.17"
        ports = ["tls"]
        args = ["/bin/sh", "${NOMAD_TASK_DIR}/start.sh"]
      }

      resources {
        cpu = 20
        memory = 100
      }

      template {
        data = <<EOF
set -e
apk add stunnel
exec stunnel {{ env "NOMAD_TASK_DIR" }}/stunnel.conf
        EOF
        destination = "${NOMAD_TASK_DIR}/start.sh"
      }

      template {
        data = <<EOF
syslog = no
foreground = yes
delay = yes

[mysql_client]
client = yes
accept = 127.0.0.1:3306
{{ range nomadService 1 (env "NOMAD_ALLOC_ID") "mysql-tls" -}}
connect = {{ .Address }}:{{ .Port }}
{{- end }}
PSKsecrets = {{ env "NOMAD_SECRETS_DIR" }}/mysql_stunnel_psk.txt

[redis_client]
client = yes
accept = 127.0.0.1:6379
{{ range nomadService 1 (env "NOMAD_ALLOC_ID") "redis-blocky" -}}
connect = {{ .Address }}:{{ .Port }}
{{- end }}
PSKsecrets = {{ env "NOMAD_SECRETS_DIR" }}/stunnel_psk.txt
        EOF
        destination = "${NOMAD_TASK_DIR}/stunnel.conf"
      }

      template {
        data = <<EOF
{{- with nomadVar "nomad/jobs/blocky/blocky/stunnel" }}{{ .mysql_stunnel_psk }}{{ end -}}
EOF
        destination = "$${NOMAD_SECRETS_DIR}/mysql_stunnel_psk.txt"
      }

      template {
        data = <<EOF
{{- with nomadVar "nomad/jobs/blocky/blocky/stunnel" -}}{{ .redis_stunnel_psk }}{{ end -}}
        EOF
        destination = "${NOMAD_SECRETS_DIR}/stunnel_psk.txt"
      }
    }

    task "blocky-bootstrap" {
      driver = "docker"

      lifecycle {
        hook = "prestart"
        sidecar = false
      }

      config {
        image = "mariadb:10"
        args = [
          "/usr/bin/timeout",
          "2m",
          "/bin/bash",
          "-c",
          "until /usr/bin/mysql --defaults-extra-file=$${NOMAD_SECRETS_DIR}/my.cnf < $${NOMAD_SECRETS_DIR}/bootstrap.sql; do sleep 10; done",
        ]
      }

      template {
        data = <<EOF
[client]
host=127.0.0.1
port=3306
user=root
{{ with nomadVar "nomad/jobs" }}
password={{ .mysql_root_password }}
{{ end }}
        EOF
        destination = "$${NOMAD_SECRETS_DIR}/my.cnf"
      }

      template {
        data = <<EOF
{{ with nomadVar "nomad/jobs/blocky" }}{{ if .db_name -}}
{{ $db_name := .db_name }}
CREATE DATABASE IF NOT EXISTS `{{ $db_name }}`;
CREATE USER IF NOT EXISTS '{{ .db_user }}'@'%' IDENTIFIED BY '{{ .db_pass }}';
GRANT ALL ON `{{ $db_name }}`.* to '{{ .db_user }}'@'%';

{{ with nomadService "grafana" }}{{ with nomadVar "nomad/jobs" -}}
-- Grant grafana read_only user access to db
GRANT SELECT ON `{{ $db_name }}`.* to '{{ .db_user_ro }}'@'%';
{{ end }}{{ end -}}

{{ else -}}
SELECT 'NOOP';
{{ end -}}{{ end -}}
        EOF
        destination = "$${NOMAD_SECRETS_DIR}/bootstrap.sql"
      }

      resources {
        cpu = 50
        memory = 50
      }
    }
  }
}