please add syslog support to snappy config ubuntu-core

[Jamie Strandboge]

You cannot currently customize logging on snappy systems. /etc/systemd/journald.conf is not writable and neither is /etc/rsyslog.d.

In my case, I wanted to do remote logging to a syslog server. systemd does allow remote logging, but not in the syslog format and Ubuntu currently doesn't include journal-remote.

I'm not sure which logging options should be exposed via snappy config, but it seems that remote logging would be a great first step. Eg, perhaps something along the lines of:

$ snappy config ubuntu-core
...
config:
  ubuntu-core:
    logging:
      remote-syslog: 10.0.0.1

This could then create /etc/rsyslog.d/snappy-logging.conf with:
*.*;auth,authpriv.none @10.0.0.1

This will forward all logs (excluding auth and authpriv) to 10.0.0.1 udp port 514.

[Oliver Grawert (ogra)]

the dir is now writable, we still need support for writing to the dir in the core-control interface and some scripting in the config hook of the core snap

[Jamie Strandboge (jdstrand)]

@Oliver, https://github.com/snapcore/snapd/pull/2770 for core-support interface changes.

Thanks for taking care of this! :)

[Oliver Grawert (ogra)]

https://github.com/snapcore/core/pull/21 waits for landing now (after the fix was removed during a merge)