Open Stack

On 2017-02-10 16:08:51 +0800 (+0800), Tom Fifield wrote:
[...]
> Down again, this time with "Network is unreachable".
[...]

I'm not finding any obvious errors on the server nor relevant
maintenance notices/trouble tickets from the service provider to
explain this. I do see conspicuous gaps in network traffic volume
and system load from ~06:45 to ~08:10 UTC according to cacti:

    http://cacti.openstack.org/?tree_id=1&leaf_id=156

Skipping back through previous days I find some similar gaps
starting anywhere from 06:30 to 07:00 and ending between 07:00 and
08:00 but they don't seem to occur every day and I'm not having much
luck finding a pattern. It _is_ conspicuously close to when
/etc/cron.daily scripts get fired from the crontab so might coincide
with log rotation/service restarts? The graphs don't show these gaps
correlating with any spikes in CPU, memory or disk activity so it
doesn't seem to be resource starvation (at least not for any common
resources we're tracking).
-- 
Jeremy Stanley