F5 Big-IP Advanced Troubleshooting

I work with F5 since many years and I always need some advanced troubleshooting tools which I documented here a little bit.

CLI Commands

Show pool members monitoring status

tmsh show ltm pool all members field-fmt | grep -P "(ltm\ pool|active-member-cnt|addr|monitor-status)"

Count pool members with monitoring status "monitor-status\ checking"

tmsh show ltm pool all members field-fmt | grep "monitor-status\ checking" | wc -l

Show Health Monitor status

Example with ICMP health monitor:

tmsh show ltm monitor icmp icmp

Answer:
Destination:   1.7.3.55:0
      State time:     up for 527hrs:54mins:45sec
    |     Last error:     N/A @2019.11.12 10:58:51

    Destination:   1.7.3.56:0
      State time:     up for 527hrs:54mins:45sec
    |     Last error:     N/A @2019.11.12 10:58:51

    Destination:   1.7.3.131:0
      State time:     down for 527hrs:54mins:45sec
    |     Last error:     No successful responses received before deadline. @2019.11.12 10:58:51

    Destination:   1.7.3.139:0
      State time:     down for 527hrs:54mins:45sec
    |     Last error:     No successful responses received before deadline. @2019.11.12 10:58:51