Forum Discussion
Jakk127
Nimbostratus
NimbostratusHealth monitor to mark pool member up when a ping FAILS (inverse ping health check)
Hello, I am attempting to figure out the best way to create a health monitor that is an inverse of the ICMP monitor-when ping to an IP fails, I want the pool member to be marked UP. When ping t...
Jakk127Nimbostratus
NimbostratusThanks for the response.
Are you saying that I should create the above script in a separate file as /usr/bin/monitors/custom_monitor.bash instead of uploading it as a custom monitor in the file section? If so, how do I call it then, and is the argument that I specify in the external monitor the IP address to ping? I want to ping a totally external address to see if it responds-NOT ping the actual pool member itself.
The reason for this is that I only want the pool/VS to be active if the external IP stops responding to ping, because that IP is tied to a remote site, and this VS needs to become active for that site if the IP stops responding.
I'm still a bit confused-when I run my script manually, I get no script output unless the IP does not to ping-that to me means what you said-that the monitor should be marked as down as long as the IP responds as there is no output.
Hello.
Normally external monitors are configured with final evaluation:
if [ $? -eq 0 ]
...Which means, if last execution was good, mark the node as UP. In your case you need exactly the opposite, for this reason you need to switch it to "1".
BTW, the process to create that external monitor is
- upload the script to F5
- create the monitor and reference that script.
First arguments are automatically updated ($1 : IP, $2 : Port), the rest of them depend on your monitor configuration.
Here some doc about external monitors
REF - https://devcentral.f5.com/s/articles/ltm-external-monitors-the-basics
KR,
Dario.