Real-world-use case: running ephemeral, containerized instances of an
app:
There may be multiple instances of the app, each running
in a separate ephemeral container with a unique uid_map.
The app's configuration directory is permanently stored on the host,
and is mounted in each container using overlayfs.
Permission for each container to access the configuration directory is granted
via
either 'chmod a+rwX' or 'setfacl -m -u:container_uid:rwX'.
In certain situations it is desirable for the upper layer of overlayfs to be
tmpfs:
-read-only host filesystem
-the host's disk is writeable but very slow (eg thumb-drives, nfs)
-the host filesystem is btrfs
(cannot be used as the upper layer with the 4.4 kernel. fixed in 4.7)
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https://bugs.launchpad.net/bugs/1617388
Title:
When using overlayfs with kernel 4.4, some files cannot be deleted.
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