of NFS server. Some peculiarities appear if you intend to run  {{Note|for information about NFS serverin client inside container, see [[VENFS]].}}

Binary RPMs that are provided Kernel-space NFS server is supported by OpenVZ community contain latest RHEL5 and RHEL6 based kernels compiledand since vzctl-3.0.24. without NFS server NB! Currently only NFSv3 is supported - no NFSv4 supportyet. Thus you have  === Prerequisites ===In order torun an NFS server inside a container, make sure:recompile the * '''nfsd kernel with CONFIG_NFSDmodule is loaded on host system before starting a container'''* '''nfsd feature for a container is turned on''' (<code>vzctl set $CTID --feature nfsd:on --save</code>) ==m. After booting = Setup ===* Make sure that rpcbind service is started before nfs service:: <code>chkconfig rpcbind on && service rpcbind start</code>* Disable NFSv4 and nfsd module loading warnings in this /etc/sysconfig/nfs by uncommenting the following lines: MOUNTD_NFS_V3="yes" RPCNFSDARGS="-N 4" NFSD_MODULE="noload"* Start NFS service:: <code>chkconfig nfs on && service nfs start</code> === Troubleshooting === Make sure that:# you have enabled nfsd feature for your container# nfsd kernel module is loaded before you'll be ablestarted the container ==== rpcbind ==== If you see this:<pre># service nfs start...to use Starting NFS server on services: [[HN] OK ]Starting NFS quotas: Cannot register service: RPC: Unable to receive; errno = Connection refusedrpc.rquotad: unable to register (RQUOTAPROG, RQUOTAVERS, udp).</pre> It means you haven't started rpcbind service. Solution:<pre>chkconfig rpcbind on && service rpcbind start</pre> ==== nfsd module ====If you see this:<pre># service nfs start....In-kernel Starting NFS server runs kernel threads daemon: rpc.nfsd: Unable to service requests of clientsaccess /proc/fs/nfsd errno 2 (No such file or directory).But for security reasons kernel threads are prohibited in Please try, as root, 'mount -t nfsd nfsd /proc/fs/nfsd' and then restart rpc.nfsd to correct the problem [[VEFAILED]]! So # mount -t nfsd nfsd /proc/fs/nfsdmount: unknown filesystem type 'nfsd'</pre> It means you wonhaven'tloaded nfsd kernel module on host before starting container. ==== warnings ==== If you see this:<pre># /etc/init.d/nfs startFATAL: Module nfsd not found.FATAL: Error running install command for nfsd...</pre> be able It is actually harmless, you don't need to do anything. In case you want this to run NFS server inside [[VE]] without patching go away, uncomment (or add) the kernelline   NFSD_MODULE="noload" in <code>/etc/sysconfig/nfs</code> file.

Advantage of user-space of NFS server is that it can be ran without any does not require kernel support in kernel.Also if it crashes - — there is no crash of a the system: just one process crashesdies, not the kernel!The disadvantage of user-space NFS server is its poductivityproductivity: noone no one can be faster then than in-kernel implementation.

Some Linux distributions contain this package: Debian Sarge (<code>nfs-user-server</code>), OpenSuse OpenSUSE 10.0 (<code>nfs-server</code>).For other distribution distributions you can download sources (for example from Debian repository) and compile it.There is a small trick you have to know about runing running <code>mountd </code> and <code>nfsd </code> (these two daemons and <code>portmap </code> constitutea user-space server). You should run them with the <code>-r </code> option:

The reason is that these daemons check the major number of the device there where the directory to export resides.If major equals 0 then daemons suppose assume that it is NFS and don't want to reexport re-export it. Symptoms arethat client clients will always get a "permission denied" error. Simfs (the file system on what VE which container is located)is assosiated associated with so called unnamed device, in which major equals 0. To So, to prevent daemons from checkingforreexporting re- exporting — just use this <code>-r </code> option. “The LINUX User-Space NFS Server” by Olaf Kirch implements NFSv2. It means that only files with sizes lessthan 2GB are processed. If you intend to use such big files then you should use another user-space NFS serverimplementation: [http://unfs3.sourceforge.net/ unfs3]. It implements v3 of NFS protocol standard. Please note that the user-space NFS server does not provide locking, or at least I couldn't get locking to work - [[User:Elronxenu|Elronxenu]] 19:49, 15 November 2007 (EST) === On Debian Lenny === The current stable debian version 5.0 (lenny) provides two packages for user space nfs support: <code>nfs-user-server</code> and <code>unfs3</code>. Here i describe my experiences with them --[[User:Strimo|Strimo]] 17:47, 16 February 2009 (UTC) It seems that also the unfs3 package has been removed from the debian repositories. --[[Special:Contributions/95.21.175.189|95.21.175.189]] 23:39, 30 July 2011 (UTC) ==== nfs-user-server ==== IMPORTANT : read http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=515957 , nfs-user-server was removed <pre>aptitude install nfs-user-server</pre> First i used nfs-user-server package since i didn't know unfs3. After installing i always got the '''permission denied''' error when i tried to mount any exported path until i found this article. So i patched the /etc/init.d/nfs-user-server file to include the <code>-r</code> parameter by adding <code>-- -r</code> to the <code>start-stop-daemon</code> line responsible for starting <code>rpc.mountd</code> and <code>rpc.nfsd</code>: <pre> start-stop-daemon --start --oknodo --quiet --exec /usr/sbin/rpc.nfsd -- -r start-stop-daemon --start --oknodo --quiet --exec /usr/sbin/rpc.mountd -- -r</pre> After the modification and a nfs server restart (<code>/etc/init.d/nfs-user-server restart</code>) i was able to mount a nfs share. At first the nfs server seems to work fine but anytime i want to edit any text file (using nano or mcedit) i got strange errors on writing to the file and i never solved the problem nor detected why this happens. So i switched to unfs3 ... <b>Note</b>: nfsmount from busybox not works with nfs-user-server in Debian Lenny, it write message "rpc failed: 2" when I try boot from nfs server. unfs3 works fine.Such problem into Ubuntu: https://bugs.launchpad.net/ubuntu/+source/nfs-user-server/+bug/189593 ==== unfs3 ==== <pre>aptitude install unfs3</pre> Works fine until now. Note that both unfs3 and nfs-user-server do not support file locking!NOTE: I tested on centos 5.6 using unfs3 and I had to run the /etc/init.d/nfs service and see it work before I could use unfs. also use exports -a before using sudo /usr/sbin/unfsd -T -e /etc/exports === On CentOS 5 ===

"The LINUX User-Space NFS Server" by Olaf Kirch implements NFSv2. It means that only files with sizes lessthan 2GB proceeded. If you intend to use such big files then are running RedHat/CentOS, you should use other user-space NFS serverimplementation: unfs3 (can [http://unfs3dag.sourceforgewieers.netcom/). It implenets v3 of NFS protocol standart.rpm/packages/unfs3/ get unfs3 from the DAG repository]