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doc: document new idmap= option for lxc.rootfs.options #3829

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May 7, 2021
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doc: document new idmap= option for lxc.rootfs.options #3829

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17 changes: 16 additions & 1 deletion doc/lxc.container.conf.sgml.in
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Expand Up @@ -1497,7 +1497,21 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
</term>
<listitem>
<para>
extra mount options to use when mounting the rootfs.
Specify extra mount options to use when mounting the rootfs.
The format of the mount options corresponds to the
format used in fstab. In addition, LXC supports the custom
<option>idmap=</option> mount option. This option can be used
to tell LXC to create an idmapped mount for the container's
rootfs. This is useful when the user doesn't want to recursively
chown the rootfs of the container to match the idmapping of the
user namespace the container is going to use. Instead an
idmapped mount can be used to handle this.
The argument for
<option>idmap=</option>
can either be a path pointing to a user namespace file that
LXC will open and use to idmap the rootfs or the special value
"container" which will instruct LXC to use
the container's user namespace to idmap the rootfs.
</para>
</listitem>
</varlistentry>
Expand Down Expand Up @@ -3098,6 +3112,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
lxc.mount.fstab = /etc/fstab.complex
lxc.mount.entry = /lib /root/myrootfs/lib none ro,bind 0 0
lxc.rootfs.path = dir:/mnt/rootfs.complex
lxc.rootfs.options = idmap=container
lxc.cap.drop = sys_module mknod setuid net_raw
lxc.cap.drop = mac_override
</programlisting>
Expand Down