man/system-or-user-ns.xml

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   5   SPDX-License-Identifier: LGPL-2.1-or-later
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   8 <refsect1>
   9   <title/>
  10
  11   <para id="singular">This option is only available for system services, or for services running in per-user
  12   instances of the service manager in which case <varname>PrivateUsers=</varname> is implicitly enabled
  13   (requires unprivileged user namespaces support to be enabled in the kernel via the
  14   <literal>kernel.unprivileged_userns_clone=</literal> sysctl).</para>
  15
  16   <para id="plural">These options are only available for system services, or for services running in per-user
  17   instances of the service manager in which case <varname>PrivateUsers=</varname> is implicitly enabled
  18   (requires unprivileged user namespaces support to be enabled in the kernel via the
  19   <literal>kernel.unprivileged_userns_clone=</literal> sysctl).</para>
  20
  21 </refsect1>