On 2017-03-29 22:47, Marat Khalili wrote:
Just don't use NFS clients using NFS server on the same machine (same
kernel), as this will break (hangs).
Huh? Works for me between LXC containers. Only had to tune
startup/shutdown sequence in systemd. In what exactly situation does
it hang? /worried/
Kernel deadlocks.
Note that you can have NFS client on machineA and NFS server on machineB
- this is fine, it's two different kernels.
NFS client on machineA, and KVM guest with NFS server also on machineA
is fine, too - two different kernels.
NFS client on machineA and NFS server on machineA, same kernel (as is
the case with LXD) - will eventually deadlock.
The whole machine will not freeze out of the sudden, but you will notice
you have more and more processes in D state, which you're not able to
kill.
See for example:
https://lwn.net/Articles/595652/
It could be something improved in newer kernels, but I'm not aware of
that.
If you need to export NFS-like mounts on the same server, you can use
gluster mount, which is userspace - and which has poor performance, not
really suitable for containers, but should be OK for i.e. large files
accessed directly (no recursive find etc.).
Tomasz Chmielewski
https://lxadm.com
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