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>
Change the kill mode to process so that systemd does not kill container
processes when the daemon is shutdown but only the docker daemon
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
We need to add delegate yes to docker's service file so that it can
manage the cgroups of the processes that it launches without systemd
interfering with them and moving the processes after it is reloaded.
Delegate=
Turns on delegation of further resource control partitioning to
processes of the unit. For unprivileged services (i.e. those
using the User= setting), this allows processes to create a
subhierarchy beneath its control group path. For privileged
services and scopes, this ensures the processes will have all
control group controllers enabled.
This is the proper fix for issue moby/moby#20152
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Systemd sets a default of 512 tasks, which is far
too low to run many containers.
Note that TasksMax is only supported on systemd 226
and above.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
There is a not-insignificant performance overhead for all containers (if
containerd is a child of Docker, which is the current setup) if systemd
sets rlimits on the main Docker daemon process (because the limits
propogate to all children).
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
set LimitCORE=infinity to ensure complete core creation,
allows extraction of as much information as possible.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>
(cherry picked from commit 51879873897afe298cbb736acef34b5a0b500424)
Signed-off-by: Andrew Hsu <andrewhsu@docker.com>
Old versions of things on CentOS 7 strike again!
infinity is not a thing for TimeoutSec on systemd < 229
Signed-off-by: Eli Uriegas <eli.uriegas@docker.com>
