[ovirt-users] Re: Q: Get Host Capabilities Failed after restart

Mon, 09 Aug 2021 05:23:12 -0700

Hi, Artur,

Small update with vdsm status, forgot to include in previous post.

I partially fixed problem with VDSM start.

Bug "Failed to create session: Start job for unit user-0.slice failed with ‘canceled’”
is being described here
and fix seem to be available here, so I have downgraded systemd with backport fix:
http://people.redhat.com/dtardon/systemd/bz1642460-backport-UserStopDelaySec=/

Now vdsmd service starts successfully, but node14 still cannot be activated because of same error. This is quite strange, before restart on Friday node just worked. There were no upgrades, nothing, just restart.

[root@node14 ~]# service vdsmd status
Redirecting to /bin/systemctl status vdsmd.service
● vdsmd.service - Virtual Desktop Server Manager
   Loaded: loaded (/usr/lib/systemd/system/vdsmd.service; enabled; vendor preset: disabled)
   Active: active (running) since Mon 2021-08-09 15:12:59 EEST; 4min 20s ago
  Process: 4066 ExecStartPre=/usr/libexec/vdsm/vdsmd_init_common.sh --pre-start (code=exited, status=0/SUCCESS)
 Main PID: 4130 (vdsmd)
    Tasks: 41 (limit: 615525)
   Memory: 59.5M
   CGroup: /system.slice/vdsmd.service
           └─4130 /usr/bin/python3 /usr/share/vdsm/vdsmd

Aug 09 15:12:55 node14.***.lv vdsmd_init_common.sh[4066]: vdsm: Running prepare_transient_repository
Aug 09 15:12:57 node14.***.lv vdsmd_init_common.sh[4066]: vdsm: Running syslog_available
Aug 09 15:12:57 node14.***.lv vdsmd_init_common.sh[4066]: vdsm: Running nwfilter
Aug 09 15:12:58 node14.***.lv vdsmd_init_common.sh[4066]: vdsm: Running dummybr
Aug 09 15:12:58 node14.***.lv vdsmd_init_common.sh[4066]: vdsm: Running tune_system
Aug 09 15:12:58 node14.***.lv vdsmd_init_common.sh[4066]: vdsm: Running test_space
Aug 09 15:12:59 node14.***.lv vdsmd_init_common.sh[4066]: vdsm: Running test_lo
Aug 09 15:12:59 node14.***.lv systemd[1]: Started Virtual Desktop Server Manager.
Aug 09 15:13:00 node14.***.lv vdsm[4130]: WARN MOM not available. Error: [Errno 111] Connection refused
Aug 09 15:13:00 node14.***.lv vdsm[4130]: WARN MOM not available, KSM stats will be missing. Error:


[root@node14]# firewall-cmd --list-all
public (active)
  target: default
  icmp-block-inversion: no
  interfaces: DMZ_node14 eno1 eno2 ovirtmgmt
  sources: 
  services: cockpit dhcpv6-client libvirt-tls mountd nfs ovirt-imageio ovirt-vmconsole rpc-bind snmp ssh vdsm
  ports: 2301/tcp 2381/tcp 22/tcp 6081/udp
  protocols: 
  forward: no
  masquerade: no
  forward-ports: 
  source-ports: 
  icmp-blocks: 
  rich rules: 
[root@node14 andrei]# 


vdsm-client Host getStats and vdsm-client Host getCapabilities attached.


Attachment: capabilities.log
Description: Binary data

Attachment: stats.log
Description: Binary data



On 9 Aug 2021, at 13:18, Artur Socha <[email protected]> wrote:

Thanks for the logs.  I am checking them at the moment. I have noticed so far that node14 is serving NFS share which had been marked as problematic (probably because of the downtime during the migration) but it has recovered.

In the meantime, is is possible to get some meaningful results when  calling:
$ vdsm-client Host getStats
and
$ vdsm-client Host getCapabilities
on node14?

What  is the state for vdsmd service when running systemctl status vdsmd? One other thing to rule out is the networking/firewall. Here the list of the ports to be open for the host (the documentation is for hosted engine, but it applies for standalone setup as well): 

btw. I have been hunting for the rare and hard to recreate bug for quite a long time (without success yet) so any reported connectivity issues between the manager and hosts are super interesting to me.

Artur

On Mon, Aug 9, 2021 at 11:44 AM Andrei Verovski <andreil1@***.lv> wrote:
Hi, Artur,


Thanks for assistance. Zipped engine starting from the day of upgrade attached.
Restart via SSH from oVirt Web GUI works.
oVirt engine runs on dedicated server, not hosted engine.




On 9 Aug 2021, at 11:24, Artur Socha <[email protected]> wrote:

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@***.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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--
Artur Socha
Senior Software Engineer, RHV
Red Hat



--
Artur Socha
Senior Software Engineer, RHV
Red Hat

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