Adding and removing workers

You can add a new worker to a functioning cluster at any time. When the worker is added the FortiController starts load balancing sessions to it. The new worker must be running the same firmware build as the workers already in the cluster. However, its configuration does not have to match because when its set to forticontroller mode its configuration will be reset to factory defaults. Then when the worker joins the cluster its configuration will be synchronized with the cluster configuration.

You can also remove a worker from a cluster at any time simply by powering down and removing the worker from the chassis. The cluster detects that the worker is removed and will stop sending sessions to it. If a worker fails or is removed the sessions that the worker is processing are lost. However, the cluster load balances new sessions to the remaining workers in the cluster.

If you re-install the missing worker the cluster will detect it and start load balancing sessions to it.

If nat-source-port is set to running-slots sessions maybe lost or interrupted when you remove or add workers. The full command syntax is: config load-balance settings set nat-source-port running-slots end