[lxc-users] Using shiftfs with NFS mounted filesystem

[Narcis Garcia]

This issue seems more apropriate here:
https://github.com/containers/fuse-overlayfs



Narcis Garcia

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El 18/7/20 a les 20:16, Michael Eager ha escrit:
> I'm running LXD on a Centos 8 host, kernel-4.18.0.  I built and
> installed the shiftfs module.
> 
> I added a device to a container which mounts a local file system in the
> container:
> $ lxc config device add devel devel disk path=/<container-path>
> source=/<host-path> shift=true
> (Both container and mounted fs are named "devel".)
> 
> This appears to work with a local FS.  Files which were owned by "root"
> on the host system show up as owned by "root" in the container, not by
> "nobody".  I can create and delete files normally.
> 
> When the host filesystem is NFS mounted, it initially appears correct in
> the container, but there are several odd behaviors:
> 
> Creating a file:
> [eager at devel devel]$ cd tmp
> [eager at devel tmp]$ ls
> [eager at devel tmp]$ touch x
> touch: cannot touch 'x': Permission denied
> [eager at devel tmp]$ ls -l
> total 512
> -rw-rw-r-- 1 eager eager 0 Jul 18 17:56 x
> 
> Deleting a file:
> [eager at devel tmp]$ rm x
> rm: remove write-protected regular empty file 'x'? y
> rm: cannot remove 'x': Permission denied
> [eager at devel tmp]$ ls -l
> total 512
> -rw-rw-r-- 1 eager eager 0 Jul 18 17:56 x
> 
> When I remove the file 'x' on the host, it's gone in the container, but
> trying to create 'x' again fails with a different error:
> [eager at devel tmp]$ ls -l
> total 0
> [eager at devel tmp]$ touch x
> touch: cannot touch 'x': Stale file handle
> [eager at devel tmp]$ ls -l
> total 0
> 
> But I can create a different file 'y', albeit with the permission error:
> [eager at devel tmp]$ touch y
> touch: cannot touch 'y': Permission denied
> [eager at devel tmp]$ ls -l
> total 1.0K
> -rw-rw-r-- 1 eager eager 0 Jul 18 18:07 y
> 
> 
> Something seems to be broken.  Is there a way to fix this?
>