Hi folks, So Gluster jenkins disk was full today (cause outages do not respect public holiday in India (Independance day) and France(Assumption)), here is the post mortem for your reading pleasure
Date: 15/08/2018
Service affected:
Jenkins for Gluster (jenkins-el7.rht.gluster.org)
Impact:
No jenkins job could be triggered.
Root cause:
A disk full mainly because we got new jobs and more patches, so
regular growth.
Resolution:
Increased the disk by 30G, and investigating if cleanup could be
improved. This did require a reboot.
Involved people:
- misc
- nigel
Lessons learned
- What went well:
- we had a documented process for that, and good enough to be used by
a tired admin.
- What went bad:
- we weren't proactive enough to see that before it caused a outage
- 15 of August is a holiday for both France and India. Technically,
none of the infra team should have been up.
- When we were lucky
- It was a day off in India, so few people were affected, except
folks who continue to work on days off
- Misc decided to go to work while being in Brno to take days off
later
Timeline (in UTC)
- 05:58 Amar post a mail to say "smoke job fail" on gluster-infra:
https://lists.gluster.org/pipermail/gluster-infra/2018-August/004795.ht
ml
- 06:23 Nigel ping Misc on Telegram to deal with it, since Nigel is
away from laptop for Independence day celebration.
- 06:24 Misc do not hear the ding since he is asleep
- 06:55 Sankarshan open a bug on it, https://bugzilla.redhat.com/show_b
ug.cgi?id=1616160
- 06:56 Misc do not see the email since he is still asleep
- 07:13 Misc wake up, see a blinking light on the phone and ponder
about closing his eyes again. He look at it, and start to swear.
- 07:14 Investigation reveal that Jenkins partition is full (100%). A
quick investigation do not yield any particular issues. The Jenkins
jobs are taking space and that's it.
- 07:19 After discussion with Nigel, it is decided to increase the size
of the partition. Misc take a look at it, try to increase without any
luck. The server is rebooted in case that's what was needed. Still not
enough.
- 07:25 Misc go quickly shower to wake him up. The warm embrace of
water make him remember that a documentation on that process do exist:
https://gluster-infra-docs.readthedocs.io/procedures/resize_vm_partitio
n.html
- 07:30 Following the documentation, we discover that the hypervisor
is now out of space for future increase. Looking at that will be done
after the post mortem.
- 07:37 Jenkins is being restarted, with more space, and seems to work
ok.
- 07:38 Misc rush to his hotel breakfast who close at 10.
- 09:09 Post mortem is finished and being sent
Action items:
- (misc) see what can be done for myrmicinae (the hypervisor where
jenkins is running) since there is no more space.
Potential improvement to make:
- we still need to have monitoring in place
- we need to move munin in the internal lan for looking at the graph
for jenkins
- documentation regarding resizing could be clearer, notably on volume
resizing part
--
Michael Scherer
Sysadmin, Community Infrastructure and Platform, OSAS
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