Re: Problems with eCryptfs using a Gluster backend.

Lance Reed <reed.r.lance@xxxxxxxxx> · Wed, 26 Feb 2014 10:11:38 -0500

I forgot to include the versions of the code I am using:
fuse-2.8.3-4.el6.x86_64
glusterfs-libs-3.4.2-1.el6.x86_64
glusterfs-server-3.4.2-1.el6.x86_64
glusterfs-3.4.2-1.el6.x86_64
glusterfs-fuse-3.4.2-1.el6.x86_64

fuse-libs-2.8.3-4.el6.x86_64
glusterfs-cli-3.4.2-1.el6.x86_64

Thanks in advance for any ideas on the subject.

On Tue, Feb 25, 2014 at 6:15 PM, Lance Reed <reed.r.lance@xxxxxxxxx> wrote:

I am attempting to setup encrypted user home directories via eCryptfs using gluster as a backend.

Very
 simple setup currently has a small two node gluster cluster mounted by a
 separate client.  Normal gluster client and NFS mount / file options 
are working fine. 

e.g. https://wiki.archlinux.org/index.php/ECryptfs#Encrypting_a_home_directory

In my attempts lay ecryptfs
 on top of the mounted native gluster setup, I am unable to edit a file,
 write etc.  I either get zero length or fixed sizes.

Only log messages I get are:

"Either
 the lower file is not in a valid eCryptfs format, or the key could not 
be retrieved. Plaintext passthrough mode is not enabled; returning -EIO"

I am posting in this forum to see if anyone knows of any reason why this may be failing from the Glusterfs side.

I am trying Centos / RHEL. 

See these bugs:

Bug 762976 - (GLUSTER-1244) ecryptfs does not work when the directory to be encrypted is on gluster mount
https://bugzilla.redhat.com/show_bug.cgi?id=762976

A non-empty file created on glusterfs with ecryptfs reports as a file of size zero
https://bugzilla.redhat.com/show_bug.cgi?id=989702#c1

These look to be issues with O_DIRECT usage in fuse.

I was hoping someone might have an idea or remember some of 
this to help me figure out if using glusterfs for a backend with  
eCryptfs is even an option.

Is it possible that this bug is still the core problem?

"ecryptfs does not work properly over nfs, cifs, samba, WebDAV, or aufs"
https://bugs.launchpad.net/ecryptfs/+bug/277578

It is old but still seems to be open..

Thanks very much in advance for any ideas on the problem.

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