There is a snap available to run a LittleBrother slave process. Note that you still need an active master process which is currently not available as snap but only as Debian package. See here.

Follow these steps to install and configure the slave process snap:

• Install the snap daemon.

• Install the LittleBrother snap:

  sudo snap install little-brother-slave
  

• Configure the snap

  sudo snap little-brother-slave set master.host.url=MASTER_HOST_URL access.token=ACCESS_TOKEN
  

  where MASTER_HOST_URL points to your master installation and ACCESS_TOKEN is the configured credential of the master.

• There are more options which have a reasonable default:

  • port: Port address to reach the health check of the slave. Defaults to 5555.
  • log.level: Verbosity of the logging. Valid values are: ERROR, WARNING, INFO (default), DEBUG
  • app.secret: A random secret that will be used to secure the web access. This is automatically initialized as a random UUID.
  • host.name: The name that will be used as label for the slave on the master. This value is automatically derived from the variable ${HOSTNAME} using the suffix .snap.

• Manually connect the required plugs:

  sudo snap connect little-brother-slave:process-control :process-control
  sudo snap connect little-brother-slave:system-observe :system-observe
  

• Restart the snap

  sudo snap little-brother-slave restart
  

and you are all set!

The version number of the snap consists of two parts:

N.N.N.M

The N.N.N part refers to the semantic versioning of the LittleBrother. See here for a full descriptions of all changes. The M part refers to the snap itself. Each release of LittleBrother should trigger a new version of the snap using M=0. If there is trouble with the snap itself the M will denote subsequent fixes to the snap.

See here

In order for LittleBrother to be able to observe and kill processes, the snap has to be allowed to use the following plugs:

• system-observe: Obtain permission to monitor the running processes.
• process-control: Obtain permission to kill the required processes. Note that the snap will only kill processes that belong to monitored users.
• network-bind: Obtain permission to bind to the port PORT to provide a health check.

These plugs are pre-configured for the snap. However, only the network-bind plug is automatically connected. The other two plugs have to be connected manually. See Above.