While real overlayfs is available only in Ubuntu and Debian kernels,
fuse-overlayfs is universally available for kernel >= 4.18.
For dockerized deployment, `--device /dev/fuse` needs to be added to
`docker run` flags.
Kubernetes deployment needs a custom device plugin that enables
`/dev/fuse`, e.g. https://github.com/honkiko/k8s-hostdev-plugin
Instead of a device plugin, the device can be also enabled by setting
`securityContext.privileged` to `true`.
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
Akihiro Suda
Sebastiaan van Stijn