[Koha] Searching capability dies every few days - Zebra problem?

[mpw]

I'm running Koha version 17.05.01 on Debian 8.8. 

I set up Koha a few months ago and we're still learning the system. One
thing we've noticed that presumably is not normal is that every few days the
searching capability dies for some reason or other. My guess is that it has
something to do with Zebra.

I occasionally get a message from my logrotate cronjob:

   Zebra already stopped for instance xxx.

When I check, there are no koha or zebra processes running. I can restore
the search capability by restarting Koha with "invoke-rc.d  koha-common
restart".

Presumably some daemon or other dies but I haven't been able to figure out
which one. Maybe it happens during the regular cronjobs?

Does anybody have any idea how I can figure out what's happening? 

One workaround I'm considering is setting up a regular cronjob to restart
koha-common regularly, but that doesn't strike me as being a very elegant
solution.




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