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systemd: add support for reloading daemon configuration through systemd

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This adds support for reloading the docker daemon
(SIGHIUP) so that changes in '/etc/docker/daemon.json'
can be loaded at runtime by reloading the service
through systemd ('systemctl reload docker')

Before this change, systemd would output an error
that "reloading" is not supported for the docker
service;

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

After this change, the docker daemon can be reloaded
through 'systemctl reload docker', which reloads
the configuration;

  journalctl -f -u docker.service

  May 02 03:49:20 testing systemd[1]: Reloading Docker Application Container Engine.
  May 02 03:49:20 testing docker[28496]: time="2016-05-02T03:49:20.143964103-04:00" level=info msg="Got signal to reload configuration, reloading from: /etc/docker/daemon.json"
  May 02 03:49:20 testing systemd[1]: Reloaded Docker Application Container Engine.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2018-08-31 12:57:03 +02:00
parent f30757f439
commit e7ad8e2b28
1 changed files with 1 additions and 0 deletions
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1
contrib/init/systemd/docker.service
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@ -13,6 +13,7 @@ ExecStartPre=/usr/libexec/containerd-offline-installer /var/lib/containerd-offli
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd
ExecReload=/bin/kill -s HUP $MAINPID
ExecStopPost=/usr/bin/dockerd post-stop
TimeoutSec=0
RestartSec=2