On 26.07.19 23:40, David Mehler wrote:
Hello,
I've got multiple service jails all on a single vps. One is a webserver
running apache 2.4 with php 7.3, the other is a mail server, a
complete virtual mail hosting
setup with Postfix, Dovecot, Rspamd, the other is a database server
running mysql, and I'm wanting to get shared
calendars in it in another setup running davical. I appear to be
having a problem where ocationally a
jail service shuts down, for example the database, which shuts
everything else down because no service can access it, or the rspamd
in the mail jail shuts down. These are all
on a single vps, a dual core I think, 4GB of ram, I'm wondering if i'm
hitting a resource bottleneck and if so how to determine it and to
limit the specific jail factor that is causing the issue?
Any suggestions appreciated.
By default jails die with their last process. If you are running
lightweight jails with just a single service inside them an the service
dies for any reason the jail is destroyed as well. You can mark the
jails as persistent to keep them around, but it wouldn't solve your real
problem. Do you still have the /var/log/messages from around the time of
the failure? As Allan Jude already mentions waking the OOM killer would
be one possible explanation for the demise of your jails and I can
attest from painful experience that the OOM killer has an uncanny knack
for finding important processes e.g. the PostgreSQL or Postfix master
processes.
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