Execute script when failover happens?

[bmaster]

Is it somehow possible to execute a script when a slave node "promotes" to master? This would be great because right now if one machine fails, there's the possibility nobody notices it.

[jimp]

Sure, this is possible on 1.2.3 and 2.0

2.0 already has the code in /etc/devd.conf to do this, but you can edit it into the end of /etc/devd.conf (and either restart devd or reboot, rebooting is probably easier):

# CARP notify hooks. This will call carpup/carpdown with the
# interface (carp0, carp1) as the first parameter.
notify 100 {
    match "system"          "IFNET";
    match "type"            "LINK_UP";
    match "subsystem"           "carp";
    action "/etc/rc.carpmaster $subsystem";
};

notify 100 {
    match "system"          "IFNET";
    match "type"            "LINK_DOWN";
    match "subsystem"           "carp";
    action "/etc/rc.carpbackup $subsystem";
};

And then it will exec /etc/rc.carpmaster when it becomes a master, and /etc/rc.carpbackup when it becomes a backup. You can change the script names if you want.

2.0 can notify by e-mail or growl when such a switch happens.

[bmaster]

Thank you, that seems to do the trick!