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man: document the new Delegate= syntax

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Lennart Poettering 2017-11-09 15:31:37 +01:00
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31
man/systemd.resource-control.xml
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@ -711,13 +711,30 @@
<term><varname>Delegate=</varname></term>
<listitem>
<para>Turns on delegation of further resource control
partitioning to processes of the unit. For unprivileged
services (i.e. those using the <varname>User=</varname>
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.</para>
<para>Turns on delegation of further resource control partitioning to processes of the unit. Units where this
is enabled may create and manage their own private subhierarchy of control groups below the control group of
the unit itself. For unprivileged services (i.e. those using the <varname>User=</varname> setting) the unit's
control group will be made accessible to the relevant user. When enabled the service manager will refrain
from manipulating control groups or moving processes below the unit's control group, so that a clear concept
of ownership is established: the control group tree above the unit's control group (i.e. towards the root
control group) is owned and managed by the service manager of the host, while the control group tree below
the unit's control group is owned and managed by the unit itself. Takes either a boolean argument or a list
of control group controller names. If true, delegation is turned on, and all supported controllers are
enabled for the unit, making them available to the unit's processes for management. If false, delegation is
turned off entirely (and no additional controllers are enabled). If set to a list of controllers, delegation
is turned on, and the specified controllers are enabled for the unit. Note that assigning the empty string
will enable delegation, but not enable any additional controllers. Defaults to false.</para>
<para>Note that controller delegation to less privileged code is only safe on the unified control group
hierarchy. Accordingly, access to the specified controllers will not be granted to unprivileged services on
the legacy hierarchy, even when requested.</para>
<para>The following controller names may be specified: <option>cpu</option>, <option>cpuacct</option>,
<option>io</option>, <option>blkio</option>, <option>memory</option>, <option>devices</option>,
<option>pids</option>. Not all of these controllers are available on all kernels however, and some are
specific to the unified hierarchy while others are specific to the legacy hierarchy. Also note that the
kernel might support further controllers, which aren't covered here yet as delegation is either not supported
at all for them or not defined cleanly.</para>
</listitem>
</varlistentry>