netplan-try - try a configuration, optionally rolling it back
netplan [--debug] try -h | --help
netplan [--debug] try [--config-file CONFIG_FILE] [--timeout TIMEOUT]
netplan try takes a netplan(5) configuration, applies it, and automatically rolls it back if the user does not confirm the configuration within a time limit.
A configuration can be confirmed or rejected interactively or by sending the SIGUSR1 or SIGINT signals.
This may be especially useful on remote systems, to prevent an administrator being permanently locked out of systems in the case of a network configuration error.
-h, --help : Print basic help.
--debug : Print debugging output during the process.
--config-file CONFIG_FILE : In addition to the usual configuration, apply CONFIG_FILE. It must be a YAML file in the netplan(5) format.
--timeout TIMEOUT : Wait for TIMEOUT seconds before reverting. Defaults to 120 seconds. Note that some network configurations (such as STP) may take over a minute to settle.
netplan try uses similar procedures to netplan apply, so some of the same caveats apply around virtual devices.
There are also some known bugs: if netplan try times out or is cancelled, make sure to verify if the network configuration has in fact been reverted.
As with netplan apply, a reboot should fix any issues. However, be sure to verify that the config on disk is in the state you expect before rebooting!
netplan(5), netplan-generate(8), netplan-apply(8)