How to know if native overlayfs is in use?

[the-sun-will-rise-tomorrow]

Hi,

I'm a little confused about the new native overlayfs support.

Specifically, how can someone find if it's being used or not?

As I understand, podman info --debug will print graphDriverName: overlay in both cases.

Is there a way to know if the FUSE or native version is used?

Also, what is Native Overlay Diff? Is that the indicator for whether the native variant is used?

Thanks!

[Luap99]

podman info will include the mount_program = /path/to/fuse-overlayfs in the output under graphOptions if I remember correctly

[eriksjolund]

If you run these commands and get the same result, then native overlayfs is used:

$ podman info -f {{.Store.GraphDriverName}}
overlay
$ podman info -f '{{index .Store.GraphStatus "Native Overlay Diff"}}'
true

Storage driver	Result of podman info -f {{.Store.GraphDriverName}}	Result of podman info -f '{{index .Store.GraphStatus "Native Overlay Diff"}}
native overlayfs	overlay	true
fuse-overlayfs	overlay	false
VFS	vfs	false

For more information, see https://github.com/containers/podman/blob/main/docs/tutorials/performance.md

[the-sun-will-rise-tomorrow]

Excellent, thank you!