Akom's Tech Ruminations

Various tech outbursts - code and solutions to practical problems

Linux Puppet recipe for setting up autossh via systemd

Posted by Admin • Thursday, November 19. 2020 • Category: DevOps, Linux

I've always set up autossh in /etc/rc.local, but with CentOS 8 that doesn't work well (things start too early, etc). Luckily, there is a nicer way using systemd templates. Essentially, all you have to do is create one symlink and one config file per instance of autossh.

Example:

Make a config file


/etc/autossh/mything.conf:

OPTIONS=-N  -M 20000 -R8888:1.2.3.4:8888 5.6.7.8


Make a symlink

ln -s /usr/lib/systemd/system/autossh@.service /etc/systemd/system/autossh@mything.service


Test

systemctl start autossh@mything.service
journalctl -xe


But it's better to automate:

Puppet Recipe



define autossh(
    $service=$name,
    $args,
  ) {

    file {"/etc/systemd/system/autossh@${service}.service":
      ensure => link,
      target => '/usr/lib/systemd/system/autossh@.service'
    } ->
    file {"/etc/autossh/${service}.conf":
      content => "OPTIONS=${args}"
    } ->
    service {"autossh@${service}":
      ensure => running,
      enable => true,
    }

}

# and example usage - random port forwarding
autossh{'mything': args => '-N  -M 20000 -R8888:1.2.3.4:8888 host1'}
autossh{'mything2': args => '-N  -M 20000 -R8888:1.2.3.4:8888 host2'}