Which is the best way to run a script upon server restart and when server is up again?
e.g. When services will be unavailable:
irc_notify "Server is going down"
when all services are available:
irc_notify "Server is up again"
Server shutdown may be triggered by various scripts, so I don't want to use shutdown command with parameters.
Create the following script /etc/init.d/irc_notify
### BEGIN INIT INFO
# Provides: irc_notifications
# Required-Start: $network
# Required-Stop:
# Default-Start: 3 5
# Default-Stop: 0 1 2 6
# Short-Description: IRC Notifications
# Description: Simple script to send notifications to IRC
### END INIT INFO
#!/bin/bash
case "$1" in
start)
irc_notify "Server is up again"
stop)
irc_notify "Server is going down"
esac
Once that is done run (for CentOS/RHEL) chkconfig add irc_notify && chkconfig irc_notify on or (for debian/ubuntu) update-rc.d irc_notify start 3 5 stop 0 1 2 6
Create a script in /etc/init.d, make it executable, then check how to execute it on the different runlevels
update-rc.d
You probably are interested in runlevel 0 (shutdown) and 3 or 5 (normal runlevel after the startup)
