developing monitors to start services

You can build a simple shell script and apply it as an external monitor to kick off a server-side script on node failure.

 

 

Sample monitor may be found on the LTM filesystem @ /usr/bin/monitors/sample_monitor

 

 

If you build it to accept the IP address of the other server in as a variable, you can use the same monitor for both nodes.

 

 

I'd recommend using a status file written to /var/run to maintain awareness between script instances of the last known status, so we are only kicking off the startup/shutdown scripts on status change.

 

 

You'll probably also want to have only the Active unit kick off the startup/shutdown scripts. (Or you could have only the Active unit run the whole script by inserting a conditional exit near the beginning of the script.)

 

 

HTH

 

/deb