Re: reliable monitor restarts

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On Fri, Oct 21, 2016 at 9:31 PM, Steffen Weißgerber
<weissgerbers@xxxxxxx> wrote:
> Hello,
>
> we're running a 6 node ceph cluster with 3 mons on Ubuntu (14.04.4).
>
> Sometimes it happen's that the mon services die and have to restarted
> manually.
>
> To have reliable service restarts I normally use D.J. Bernsteins deamontools
> on other Linux distributions. Until now I never did this on Ubuntu.
>
> Is there a comparable way to configure such a watcher on services on Ubuntu
> (i.e. under systemd)?

Systemd handles this for you.
The ceph-mon unit file has:

Restart=on-failure
StartLimitInterval=30min
StartLimitBurst=3

Note that systemd only restarts it 3 times in 30 minutes. If it fails
more often, you'll have to reset the unit.

You can finetune this with drop-ins, see systemd.service(5) for details.

>
> Regards and have a nice weekend.
>
> Steffen

Kind regards,

Ruben Kerkhof
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