4

I have two directories (a and b), which are NFS shares with files foo.txt and bar.txt:

I want merge this two directories to directory merge (does not have to be writable)

this is possible by command:

sudo mount -t overlay -olowerdir=a:b overlay merge

At first sight everything is ok:

.
├── a
│   └── foo.txt
├── b
│   └── bar.txt
└── merge
    ├── bar.txt
    └── foo.txt

But i can not read content of files: $ cat merge/foo.txt cat: merge/foo.txt: No such device or address

This occurs only on NFS share, on plain FS no problem.


According to documentation https://www.kernel.org/doc/Documentation/filesystems/overlayfs.txt:

An overlay filesystem combines two filesystems - an 'upper' filesystem and a 'lower' filesystem.

A read-only overlay of two read-only filesystems may use any filesystem type.

So I guess NFS is not a problem.

1

What kernel are you using? it seems that a bug was introduced in kernel 4.2:

https://github.com/coreos/rkt/issues/1537

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.