[Bug 1331891] Re: [systemd] /etc/logrotate.d/rsyslog fails to reload rsyslog

[Michael Biebl]

2014-07-08 14:01 GMT+02:00 Dimitri John Ledkov <launchpad at surgut.co.uk>:
> systemd unit for which "reload" similarly sends SIGHUP. In debian
> unstable a native systemd unit is added for rsyslog, for which reload
> similarly just sends SIGHUP.

That is not true. The rsyslog.service file in Debian's rsyslog package
does *not* have ExecReload set, at least not anymore.
The ExecReload setting was removed upstream because a "reload" means
that a daemon rereads its configuration, which it no longer does for
rsyslog.

Which means, you can't run "systemctl reload rsyslog.service".

# systemctl reload rsyslog.service
Failed to reload rsyslog.service: Job type reload is not applicable
for unit rsyslog.service.

The logrotate file for rsyslog in Debian currently uses
invoke-rc.d rsyslog rotate

This is an action only implemented by the SysV init script. That means
it currently actually relies on the SysV init script even when booted
with systemd.

In Debian, SysV init scripts are still mandatory, so this is sort-of
ok, even though I don't particularly like this situation.

A solution that would work with all init systems would be something like

kill -SIGHUP $(cat /var/run/rsyslogd.pid).

A systemd-only solution would look like this:

systemctl kill -s HUP rsyslog.service




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https://bugs.launchpad.net/bugs/1331891

Title:
  [systemd] /etc/logrotate.d/rsyslog fails to instruct rsyslog to close
  & reopen fds

Status in “rsyslog” package in Ubuntu:
  New

Bug description:
  /etc/logrotate.d/rsyslog contains

          postrotate
                  reload rsyslog >/dev/null 2>&1 || true
          endscript

  which works on Upstart but not on systemd. Therefore, after logs are
  rotated, rsyslog continues to write to the old files, leaving the new
  files empty. It should be changed to ‘service rsyslog reload’ or
  ‘invoke-rc.d rsyslog reload’ or something.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: rsyslog 7.4.4-1ubuntu3
  ProcVersionSignature: Ubuntu 3.15.0-6.11-generic 3.15.0
  Uname: Linux 3.15.0-6-generic x86_64
  NonfreeKernelModules: openafs
  ApportVersion: 2.14.3-0ubuntu2
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Wed Jun 18 22:20:53 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2010-12-05 (1291 days ago)
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha amd64 (20101202)
  SourcePackage: rsyslog
  UpgradeStatus: Upgraded to utopic on 2013-10-31 (230 days ago)

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