NFS in a Centos 6 LXC Proxmox 4.1
Posted on January 28, 2016 • 2 minutes • 365 words • Suggest Changes
Getting NFS to work seems a bit of a grey area for LXC … I only recently switched part of our infrastructure over to LXC. But no NFS would be definitely a no-go.
We only work in a virtualized environment because its easy for backups and to efficiently use the computational resources on each of our server. That’s the reason, security of what a container can do, is only a second to functionality. On top of that, most of these containers are not giving out a service to the outside world, the only reason they have a connection to the web is for LAN and updates. So before you use this “guide”, know that I did not look into it.
I started by updating & installing nfs common’s.
# updates yum update -y # install nfs yum install nfs-utils nfs-utils-lib
Next I tried to start & keep them online after reboot.
# mark them as start-during-boot chkconfig rpcbind on chkconfig nfs on # start the services service rpcbind start service nfs start
I received this error :
Starting NFS daemon: rpc.nfsd: Unable to access /proc/fs/nfsd errno 2 (No such file or directory). Please try, as root, 'mount -t nfsd nfsd /proc/fs/nfsd' and then restart rpc.nfsd to correct the problem
Which I believe means, that some of the nfs kernel modules was not loaded when the container was started. This was solved by installing nfs-kernel-server on the proxmox head.
apt-get install nfs-kernel-server
I also needed to add an exception to apparmor, I don’t know exactly how apparmor works, but it can be overruled in the lxc configuration (
/etc/pve/lxc/101.conf) with : (add)
After that I restarted the container in proxmox webgui. (cause I don’t know the console commands 🙂 ) I retried and the services started. Although I found that NFS was not reporting as working :
service nfs status rpc.svcgssd is stopped rpc.mountd (pid 1061) is running... nfsd dead but subsys locked
However a mount from an external machine worked.
/etc/exports from lxc container
and a soft mount from the client (non lxc in this test)
mount -o soft,rw lxc_ip:/data /mnt/tmp
So not 100% its save, but its working 🙂