author	title	summary	tags
Stephan Lichtenauer	Rsnapshot Server (Nomad)	This is a Rsnapshot jail that can be used as backup server and be deployed via nomad.	rsnapshot rsync backup nomad

Overview

This is a rsnapshot jail that can be started with pot but it can also be deployed via nomad.

For more details about nomad images, see about potluck.

The jail exposes these parameters that can either be set via the environment or by setting the cookparameters (the latter either via nomad, see example below, or by editing the downloaded jails pot.conf file):

Environment	cook parameter	Content
ALPHA	-a	/etc/crontab frequency for alpha backup plan
BETA	-b	Optional: /etc/crontab frequency for beta backup plan
DELTA	-d	Optional: /etc/crontab frequency for delta backup plan
GAMMA	-g	Optional: /etc/crontab frequency for gamma backup plan

The frequency is given in the standard cron entry format, e.g. "0 */4 * * *" or "40 23 * * 6".

Nomad Job Description Example

It is suggested to mount the jail directory /.snapshots from outside as it contains the backups (or any other backup directory that you define in your configuration below).

Also, you should copy in the rsnapshot.conf file to /usr/local/etc with your configuration settings.

Last not least, since you probably will use ssh to access clients, you also want to copy your private/public key pair to /root/.ssh so the BackupPC server can access your clients.

Assuming that you don't copy in a known_hosts file, ssh would prompt on the first connection attempt to your clients that are to be backed up for your confirmation to add the unknown ssh host keys to your known_hosts file within the jail, a prompt that you won't see of course as the job is run inside the jail via cron. Therefore, it is suggested that you add ssh_args -o "StrictHostKeyChecking=no" to your rsnapshot.conf to suppress the prompt and make sure the backup runs correctly in batch mode.

Example with passing parameters to the cook script:

job "rsnapshot" {
  datacenters = ["mydc"]
  type        = "service"

  group "group1" {
    count = 1 

    task "backupmx1" {
      driver = "pot"

      config {
        image = "https://potluck.honeyguide.net/rsnapshot-nomad"
        pot = "rsnapshot-nomad-amd64-12_1"
        tag = "1.0"
        command = "/usr/local/bin/cook"
        args = ["-a","\"40 23 * * 6\""]
        mount = [
          "/mnt/backups:/.snapshots"
        ]
        copy = [
          "/mnt/rsnapshot.conf:/usr/local/etc/rsnapshot.conf"
          "/mnt/id_rsa:/root/.ssh/id_rsa",
          "/mnt/id_rsa.pub:/root/.ssh/id_rsa.pub"
        ]
      }

      resources {
        cpu = 500
        memory = 1024
      }
    }
  }
}