Re: All OSDs on one host down

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A reboot of the host has fixed the problem but I still want to find the root cause. 

Looking at the logs I can see the original mon went down because the docker engine shutdown in response to a network event. That network event seems to appears to be systemd wait-on-network timeout related and an daily apt updates check happening at the same time. 

When the mon was rebooted, and came back up, this seemed to trigger the OSDs on a separate server to shutdown.  Only OSD containers shutdown, not mon/mgr or mds containers. Again, this seems to be a requested shutdown rather than a crash….

Need to some more digging…..

Any thoughts would be appreciated. 

A

Sent from my iPhone

On 6 Aug 2021, at 09:20, David Caro <dcaro@xxxxxxxxxxxxx> wrote:

On 08/06 07:59, Andrew Walker-Brown wrote:
> Hi Marc,
> 
> Yes i’m probably doing just that.
> 
> The ceph admin guides aren’t exactly helpful on this.  The cluster was deployed using cephadm and it’s been running perfectly until now.
> 
> Wouldn’t running “journalctl -u ceph-osd@5” on host ceph-004 show me the logs for osd.5 on that host?

On my containerized setup, the services that cephadm created are:

dcaro@node1:~ $ sudo systemctl list-units | grep ceph
 ceph-d49b287a-b680-11eb-95d4-e45f010c03a8@crash.node1.service                                                                                 loaded active running   Ceph crash.node1 for d49b287a-b680-11eb-95d4-e45f010c03a8
 ceph-d49b287a-b680-11eb-95d4-e45f010c03a8@mgr.node1.mhqltg.service                                                                            loaded active running   Ceph mgr.node1.mhqltg for d49b287a-b680-11eb-95d4-e45f010c03a8
 ceph-d49b287a-b680-11eb-95d4-e45f010c03a8@mon.node1.service                                                                                   loaded active running   Ceph mon.node1 for d49b287a-b680-11eb-95d4-e45f010c03a8
 ceph-d49b287a-b680-11eb-95d4-e45f010c03a8@osd.3.service                                                                                       loaded active running   Ceph osd.3 for d49b287a-b680-11eb-95d4-e45f010c03a8
 ceph-d49b287a-b680-11eb-95d4-e45f010c03a8@osd.7.service                                                                                       loaded active running   Ceph osd.7 for d49b287a-b680-11eb-95d4-e45f010c03a8
 system-ceph\x2dd49b287a\x2db680\x2d11eb\x2d95d4\x2de45f010c03a8.slice                                                                         loaded active active    system-ceph\x2dd49b287a\x2db680\x2d11eb\x2d95d4\x2de45f010c03a8.slice
 ceph-d49b287a-b680-11eb-95d4-e45f010c03a8.target                                                                                              loaded active active    Ceph cluster d49b287a-b680-11eb-95d4-e45f010c03a8
 ceph.target                                                                                                                                   loaded active active    All Ceph clusters and services

where the string after 'ceph-' is the fsid of the cluster.
Hope that helps (you can use the systemctl list-units also to search the specific ones on yours).


> 
> Cheers,
> A
> 
> 
> 
> 
> 
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
> 
> From: Marc<mailto:Marc@xxxxxxxxxxxxxxxxx>
> Sent: 06 August 2021 08:54
> To: Andrew Walker-Brown<mailto:andrew_jbrown@xxxxxxxxxxx>; ceph-users@xxxxxxx<mailto:ceph-users@xxxxxxx>
> Subject: RE: All OSDs on one host down
> 
>> 
>> I’ve tried restarting on of the osds but that fails, journalctl shows
>> osd not found.....not convinced I’ve got the systemctl command right.
>> 
> 
> You are not mixing 'not container commands' with 'container commands'. As in, if you execute this journalctl outside of the container it will not find anything of course.
> 
> 
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-- 
David Caro
SRE - Cloud Services
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