homelab-nomad/backups/backup.nomad

job "backup%{ if batch_node != null }-oneoff-${batch_node}%{ endif }" {
  datacenters = ["dc1"]
  priority = 90
  %{ if batch_node == null ~}
  type = "system"
  %{ else ~}
  type = "batch"

  parameterized {
    meta_required = ["job_name"]
    meta_optional = ["task", "snapshot"]

  }

  meta {
    task = "backup"
    snapshot = "latest"
  }
  %{ endif ~}

  %{ if batch_node != null ~}
  constraint {
    attribute = "$${node.unique.name}"
    value = "${batch_node}"
  }
  %{ endif ~}

  group "backup" {

    network {
      mode = "bridge"

      port "metrics" {
        host_network = "wesher"
        to = 8080
      }
    }

    volume "all-volumes" {
      type = "host"
      read_only = false
      source = "all-volumes"
    }

    service {
      name = "backup"
      provider = "nomad"
      port = "metrics"

      tags = [
        "prometheus.scrape"
      ]
    }

    task "backup" {
      driver = "docker"

      volume_mount {
        volume = "all-volumes"
        destination = "/data"
        read_only = false
      }

      config {
        image = "iamthefij/resticscheduler:0.2.0"
        ports = ["metrics"]
        args = [
          %{ if batch_node != null ~}
          "-once",
          "-$${NOMAD_META_task}",
          "$${NOMAD_META_job_name}",
          "--snapshot",
          "$${NOMAD_META_snapshot}",
          "--push-gateway",
          "http://pushgateway.nomad:9091",
          %{ endif ~}
          "$${NOMAD_TASK_DIR}/node-jobs.hcl",
        ]
      }

      env = {
        "RCLONE_CHECKERS" = "2"
        "RCLONE_TRANSFERS" = "2"
        "RCLONE_FTP_CONCURRENCY" = "5"
      }

      template {
        data = <<EOF
MYSQL_HOST=127.0.0.1
MYSQL_PORT=3306
# TODO: Move this to new mysql root pass path
{{ with nomadVar "nomad/jobs" }}
MYSQL_USER=root
MYSQL_PASSWORD={{ .mysql_root_password }}
{{ end -}}
{{ with nomadVar (print "nomad/jobs/" (env "NOMAD_JOB_ID")) -}}
BACKUP_PASSPHRASE={{ .backup_passphrase }}
RCLONE_FTP_HOST={{ .nas_ftp_host }}
RCLONE_FTP_USER={{ .nas_ftp_user }}
RCLONE_FTP_PASS={{ .nas_ftp_pass.Value | toJSON }}
RCLONE_FTP_EXPLICIT_TLS=true
RCLONE_FTP_NO_CHECK_CERTIFICATE=true
{{ end -}}
        EOF
        destination = "secrets/db.env"
        env = true
      }


      template {
        # Build jobs based on node
        data = <<EOF
# Current node is {{ env "node.unique.name" }} {{ env "node.unique.id" }}

%{ for job_file in fileset(module_path, "jobs/*.hcl") ~}
{{ range nomadService 1 "backups" "${trimsuffix(basename(job_file), ".hcl")}" -}}
# ${trimsuffix(basename(job_file), ".hcl")} .Node {{ .Node }}
{{ if eq .Node (env "node.unique.id") -}}
${file("${module_path}/${job_file}")}

{{ end -}}
{{ end -}}
%{ endfor ~}
        EOF
        destination = "local/node-jobs.hcl"
      }

      resources {
        cpu = 50
        memory = 256
      }
    }

    task "stunnel" {
      driver = "docker"

      lifecycle {
        hook = "prestart"
        sidecar = true
      }

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

      resources {
        cpu = 100
        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
        EOF
        destination = "$${NOMAD_TASK_DIR}/stunnel.conf"
      }

      # TODO: Get psk for backup jobs despite multiple job declarations
      # Probably should use variable ACLs to grant each node job to this path
      template {
        data = <<EOF
{{- with nomadVar (print "nomad/jobs/" (env "NOMAD_JOB_ID")) }}{{ .mysql_stunnel_psk }}{{ end -}}
EOF
        destination = "$${NOMAD_SECRETS_DIR}/mysql_stunnel_psk.txt"
      }
    }
  }
}