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→How to teach CRIU to dump them
which will mean, that the mountpoint /bar has inaccessible root.
which will mean, that the mountpoint /bar has inaccessible root.
To dump and restore them there's the <code>--ext-mount-map KEY:VAL</code> option that sets up external mounts root mapping.
On dump, KEY is a mountpoint inside container and correspoding VAL is a string that will be written into the image as mountpoint's root value.
On restore KEY is the value from the image (VAL from dump) and the VAL is the path on host that will be bind-mounted into container (to the mountpoint path from image).
For example, if we want to dump the task above we should call
criu dump ... --ext-mount-map /bar:barmount
The word <code>barmount</code> is an arbitrary identifier, that will be put in the image file instead of the original root path
criu show -f mountpoints.img -F mnt_id,root,mountpoint
mnt_id: 0x22 root: barmount mountpoint: /bar
On restore we should tell CRIU where to bind mount the <code>barmount</code> from like this
criu restore ... --ext-mount-map barmount:/foo
With this CRIU will bind mount the /foo into proper mountpoint.