Hi Andrei,

Could you also post a relevant piece of engine.log? I don't have high expectations to find the answer there but I just want to be sure of it.

VDSM.log does not show any trace of error from the vdsm point of view. For example it looks like it started correctly and subscribed to receiving commands from the engine (yet that does not mean I connected to it - only in listening mode).

Can you confirm that 'SSH restart' from UI works - by 'works' I mean the host is actually restarted after a few minutes and there are no ssh related (public key etc) errors in engine.log?

Artur

On Mon, Aug 9, 2021 at 9:55 AM Andrei Verovski <andreil1@starlett.lv> wrote:

Hi,

I have oVirt 4.4.7.6-1.el8 and one problematic node (HP ProLiant with CentOS 8 stream).
After replacing server rack router switch and restart got this error I can’t recover from:

VDSM node14 command Get Host Capabilities failed: Message timeout which can be caused by communication issues

vdsm-network running fine, but vdsmd can’t start on node14 for whatever reason. All other nodes running fine.

Aug 09 10:24:12 node14.mydomain.lv vdsmd_init_common.sh[4825]: vdsm: Running dummybr
Aug 09 10:24:13 node14.mydomain.lv vdsmd_init_common.sh[4825]: vdsm: Running tune_system
Aug 09 10:24:13 node14.mydomain.lv vdsmd_init_common.sh[4825]: vdsm: Running test_space
Aug 09 10:24:13 node14.mydomain.lv vdsmd_init_common.sh[4825]: vdsm: Running test_lo
Aug 09 10:24:13 node14.mydomain.lv systemd[1]: Started Virtual Desktop Server Manager.
Aug 09 10:24:16 node14.mydomain.lv sudo[7721]: pam_systemd(sudo:session): Failed to create session: Start job for unit user-0.slice failed with 'canceled'
Aug 09 10:24:16 node14.mydomain.lv sudo[7721]: pam_unix(sudo:session): session opened for user root by (uid=0)
Aug 09 10:24:16 node14.mydomain.lv sudo[7721]: pam_unix(sudo:session): session closed for user root
Aug 09 10:24:17 node14.mydomain.lv vdsm[6754]: WARN MOM not available. Error: [Errno 2] No such file or directory
Aug 09 10:24:17 node14.mydomain.lv vdsm[6754]: WARN MOM not available, KSM stats will be missing. Error:

In web gui -> Management I can’t do anything with the host except restart. Stop aborts with error, all other commands are gray-ed out.
Status is “Unassigned”. Host is answering to pings as usual.
vdsm.log (from node14) attached.

Thanks in advance for any help.

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