Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)
Hi All,
It appears I had a network glitch last night. Now all hosts except the ones in the same subnet as the CheckMK server are showing as DOWN in WATO. I have run the “connection tests” for several of the hosts, and both ping and agent tests are successful (green). I have even restarted CheckMK (on the server and a few of the monitored hosts) but nothing has made a difference. Note that the services on all the hosts are fine/OK. The monitored hosts are in about 5 different subnets. Strangely enough a couple of hosts in each of the other subnets appear to have either survived the issue or recovered and are showing UP as expected.
I found this, but it wasn’t really helpful: Server showing as down in Host groups but the Check_mk service is green
If you use smartping you need to check if processes icmpsender and icmpreceiver are running. I recently had the situation that membership in group omd vanished for site user
OMD[beta]:~$ id
uid=982(beta) gid=1005(beta) groups=1005(beta),979(omd)
Hi Mike,
My site user is still a member of the omd group. I am not clear on how to check for the two processes you mentioned. If I run a “ps -ef | grep icmp” on the server, I can see nagios check_icmp commands running against different IPs.
I noticed today that the number of hosts reported as down has gone up from 50 (yesterday) to 101, yet the services on all the systems are still OK.
Also I don’t have files icmpsender and icmpreceiver anywhere on my system, so I suspect they only apply to checkmk core and not the free RAW edition.
But I am encountering exactly the same issue by the OP at the forum post below where I can ping the target host(s), but check_icmp is returning critical for the same host(s) (when I execute it from the shell).
So what I have done is to change the “Host Monitoring Rules/Host Check Command” to “TCP Connect” (port 6556) so now all the hosts are back UP. But would definitely like to fix the check_ping issue.
I’m running 2.0.0p6 raw on RHEL 8 and all my hosts are reporting “DOWN” though all service checks are checking Ok.
Solution: Click on setup and search in setup “Host Check Command” and create a rule and change “Host Check Command” to “TCP Connect” and apply to folder/host.
it worked for me, thank you! @mike1098
But i am still confuse why this issue is only when i was trying to add new host but not with the existing hosts.
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