snappy services - auto restart

[Myles Caley]

Ok, I jumped the gun on the hack, looks like the .service files for the
snaps are auto-generated at startup. Is there a template I can modify
somewhere for now?

From:  Myles Caley <myles at firstbuild.com>
Date:  Thursday, April 30, 2015 at 10:36 AM
To:  Sergio Schvezov <sergio.schvezov at canonical.com>, Dustin Kirkland
<kirkland at canonical.com>
Cc:  Steve Langasek <steve.langasek at canonical.com>, Snappy Dev List
<snappy-app-devel at lists.ubuntu.com>
Subject:  Re: snappy services - auto restart

Thanks Sergio. Confirmed that restart is not enabled by default. I modified
the .service file which is definitely a hack. For our needs, just having
auto-restart by default when installing the snap package is fine. Having
additional controls exposed through the snappy utils is not necessary for us
if this is enabled.


From:  Sergio Schvezov <sergio.schvezov at canonical.com>
Date:  Saturday, April 25, 2015 at 11:56 AM
To:  Dustin Kirkland <kirkland at canonical.com>
Cc:  Myles Caley <myles at firstbuild.com>, Steve Langasek
<steve.langasek at canonical.com>, Snappy Dev List
<snappy-app-devel at lists.ubuntu.com>
Subject:  Re: snappy services - auto restart

On Thu, Apr 23, 2015 at 12:20 PM, Dustin Kirkland <kirkland at canonical.com>
wrote:
> On Mon, Apr 20, 2015 at 11:05 AM, Myles Caley <myles at firstbuild.com> wrote:
>> > Is there a way to configure services in snapps to auto-restart if the
>> > process dies? Along the same lines, is there a way via snappy CLI to
>> > manually restart a service if it does die?
> 
> Hmm, that should be a systemd thing, I suspect.
> 
> Sergio, et al, any ideas?

>From my point of view we should be autorestarting services, if that's not
the case, I guess we want to fix that.

For the latter, we don't have a snappy interface to restart services (we
could expose one, not sure about the granularity though), for now here's a
cheatsheet:

Manage and check state:
sudo systemctl [start|stop|restart|status]
[package_name]_[service_name]_[package_version].service

eg; webdm 0.6 has a service called avahi, so I would

sudo systemctl start webdm_avahi_0.6.service

Check logs
sudo journalctl -u [package_name]_[service_name]_[package_version].service

e.g.; to check the aforementioned service's logs:

sudo journalctl -u  webdm_avahi_0.6.service



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