Difference between revisions of "NFSv3"

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[[Category:File systems]]
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#REDIRECT [[NFS]]
[[Category:Networking]]
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[[cs:NFS]]
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[[es:NFS]]
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[[fr:NFS]]
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[[it:NFS]]
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[[ru:NFS]]
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[[zh-CN:NFSv3]]
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{{Merge|NFS|There's only one {{Pkg|nfs-utils}}, all problems regarding compatibility with version 3 should probably be better mentioned in [[NFS]] or [[NFS Troubleshooting]].|section=systemd/systemv}}
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{{Out of date|Still heavily refers to initscripts|section=systemd/systemv}}
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{{Note|This article covers NFSv3, for the current version 4 see [[NFS]]}}
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The goal of this article is to assist in setting up an nfs-server for sharing files over a network.
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* nfs-utils has been upgraded since 2009-06-23, and NFS4 support is now implemented. Refer to the [https://www.archlinux.org/news/452/ news bulletin].
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* portmap has been replaced by rpcbind.
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== Required packages ==
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Required packages for both the server and the client are minimal. You will only need to [[pacman|install]] the {{Pkg|nfs-utils}} package from the [[official repositories]]. Optionally, install the {{Pkg|keyutils}} package to use the keyring based idmapper on the NFS client.
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== Setting up the server ==
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You can now edit your configuration and then start the daemons.
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{{Note|It is '''highly''' recommended to use a time sync daemon on '''all''' nodes of your network to keep client/server clocks in sync. Without accurate clocks on all nodes, NFS can introduce unwanted delays! Seemingly random "Device or Resource busy" messages when operating on shares might be caused by clocks that are out of sync.}}
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=== Files ===
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==== /etc/exports ====
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This file defines the various shares on the nfs server and their permissions. A few examples:
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/files *(ro,sync) # Read-only access to anyone
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/files 192.168.0.100(rw,sync) # Read-write access to a client on 192.168.0.100
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/files 192.168.1.1/24(rw,sync) #  Read-write access to all clients from 192.168.1.1 to 192.168.1.255
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/bsd  *(ro,sync,insecure) #  BSD clients require insecure as otherwise connections will be rejected by the client
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If you make changes to {{ic|/etc/exports}} after starting the daemons, you can make them effective by issuing the following command:
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# exportfs -r
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If you decide to make your NFS share public and writable, you can use the all_squash option in combination with anonuid and the anongid option.
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For example, to set the privileges for the user {{ic|nobody}} in the group {{ic|nobody}}, you can do the following:
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; Read-write access to a client on 192.168.0.100, with rw access for the user 99 with gid 99
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/files 192.168.0.100(rw,sync,all_squash,anonuid=99,anongid=99))
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This also means, that if you want write access to this directory, {{ic|nobody.nobody}} must be the owner of the share directory:
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# chown -R nobody.nobody /files
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Full details on the exports file are provided by the exports man page.
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==== /etc/conf.d/nfs-common.conf ====
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{{Note|This used to be in {{ic|/etc/conf.d/nfs}} which is replaced by {{ic|/etc/conf.d/nfs-common.conf}} and {{ic|/etc/conf.d/nfs-server.conf}}.}}
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Edit this file to pass appropriate run-time options to nfsd, mountd, statd, and sm-notify. The default Arch NFS init scripts require the --no-notify option for statd, as follows:
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STATD_OPTS="--no-notify"
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Others may be left at the provided defaults, or changed according to your requirements. Please refer to the relevant man pages for full details.
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=== Daemons ===
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You can now start the server with the following commands:
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# rc.d start rpcbind (or: rc.d start portmap)
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# rc.d start nfs-common (or: rc.d start nfslock)
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# rc.d start nfs-server (or: rc.d start nfsd)
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Please note that they must be started in that order. To start the server at boot time, add these daemons to the DAEMONS array in {{ic|/etc/rc.conf}}. It may be necessary to start the daemons as root / using sudo when you start them from the terminal.
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{{Note|One or more of the daemons may not start if they are backgrounded in your {{ic|/etc/rc.conf}}.}}
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=== systemd services ===
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# systemctl enable rpc-mountd.service rpc-statd.service
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If you have trouble getting NFS working, you may want to consider forcing the NFS daemon module to load:
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# echo nfsd > /etc/modules-load.d/nfsd.conf
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== Setting up the client ==
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=== Files===
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==== /etc/conf.d/nfs-common.conf ====
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Edit this file to pass appropriate run-time options to statd - the remaining options are for server use only. Do ''not'' use the --no-notify option on the client side, unless you are fully aware of the consequences of doing so.
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Please refer to the statd man page for full details.
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==== /etc/request-key.conf ====
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Kernels after 2.6.37 support using request-key to find and cache idmapper entries.  Using request-key allows multiple idmap requests to be placed at a single time, making it significantly more scalable than the legacy code.
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Please refer to the nfsidmap page for full details.
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=== Daemons ===
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Start the rpcbind and nfs-common daemons:
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rc.d start rpcbind (or: rc.d start portmap)
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rc.d start nfs-common (or: rc.d start nfslock)
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Please note that they must be started in that order.
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To start the daemons at boot time, add them to the DAEMONS array in /etc/rc.conf.
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=== systemd services ===
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# systemctl enable rpc-statd.service
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=== Mounting ===
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Show the server's exported filesystems:
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showmount -e server
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Then just mount as normal:
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mount server:/files /files
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Unlike CIFS shares or [[rsync]], NFS exports must be called by the full path on the server; example, if /home/fred/music is defined in /etc/exports on server ELROND, you must call:
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mount ELROND:/home/fred/music /mnt/point
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instead of just using:
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mount ELROND:music /mnt/point
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or you will get ''mount.nfs: access denied by server while mounting''
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{{Note|If you see the following message then you probably did not start the daemons from the [[#Daemons|previous section]] or something went wrong while starting them.
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{{bc|<nowiki>
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mount: wrong fs type, bad option, bad superblock on 192.168.1.99:/media/raid5-4tb,
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      missing codepage or helper program, or other error
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      (for several filesystems (e.g. nfs, cifs) you might
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      need a /sbin/mount.<type> helper program)
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      In some cases useful info is found in syslog - try
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      dmesg | tail  or so
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</nowiki>}}
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}}
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=== Auto-mount on boot ===
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If you want to mount on boot, make sure network, rpcbind (portmap), nfs-common (nfslock) and netfs are in the DAEMONS array in /etc/rc.conf. Make sure the order is this one. It is better not to put any '@' in front of them (although you could safely use @netfs); for instance:
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DAEMONS=(... network rpcbind nfs-common @netfs ...)
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or
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DAEMONS=(... network portmap nfslock @netfs ...)
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Add an appropriate  line in /etc/fstab, for example:
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server:/files /files nfs defaults 0 0
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If you wish to specify a packet size for read and write packets, specify them in your fstab entry. The values listed below are the defaults if none are specified:
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server:/files /files nfs rsize=32768,wsize=32768 0 0
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Read the nfs man page for further information, including all available mount options.
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== Troubleshooting ==
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{{Note|See dedicated article: [[NFS Troubleshooting]].}}
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=== mount.nfs: Operation not permitted ===
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After updating to nfs-utils 1.2.1-2, mounting NFS shares stopped working. Henceforth, nfs-utils uses NFSv4 per default instead of NFSv3. The problem can be solved by using either mount option {{ic|1='vers=3'}} or {{ic|1='nfsvers=3'}} on the command line:
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# mount.nfs <remote target> <directory> -o ...,vers=3,...
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# mount.nfs <remote target> <directory> -o ...,nfsvers=3,...
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or in {{ic|/etc/fstab}}:
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<remote target> <directory> nfs ...,vers=3,... 0 0
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<remote target> <directory> nfs ...,nfsvers=3,... 0 0
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== Tips and tricks ==
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=== Configure NFS fixed ports ===
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If you have a port-based firewall, you might want to set up a fixed ports. For rpc.statd and rpc.mountd you should set following settings in {{ic|/etc/conf.d/nfs-common}} and {{ic|/etc/conf.d/nfs-server}} (ports can be different):
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{{hc|/etc/conf.d/nfs-common|2=STATD_OPTS="-p 4000 -o 4003"}}
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{{hc|/etc/conf.d/nfs-server|2=MOUNTD_OPTS="--no-nfs-version 2 -p 4002"}}
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{{hc|/etc/modprobe.d/lockd.conf|2=# Static ports for NFS lockd
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options lockd nlm_udpport=4001 nlm_tcpport=4001}}
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Then you need restart nfs daemons and reload lockd module:
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{{bc|<nowiki># modprobe -r lockd
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# modprobe lockd
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# rc.d restart nfs-common nfs-server</nowiki>}}
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After restart nfs daemons and reload modules you can check used ports with following command:
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{{hc|$ rpcinfo -p|rpcinfo -p
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  program vers proto  port  service
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    100000    4  tcp    111  portmapper
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    100000    3  tcp    111  portmapper
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    100000    2  tcp    111  portmapper
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    100000    4  udp    111  portmapper
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    100000    3  udp    111  portmapper
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    100000    2  udp    111  portmapper
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    100024    1  udp  4000  status
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    100024    1  tcp  4000  status
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    100021    1  udp  4001  nlockmgr
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    100021    3  udp  4001  nlockmgr
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    100021    4  udp  4001  nlockmgr
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    100021    1  tcp  4001  nlockmgr
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    100021    3  tcp  4001  nlockmgr
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    100021    4  tcp  4001  nlockmgr
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    100003    2  tcp  2049  nfs
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    100003    3  tcp  2049  nfs
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    100003    4  tcp  2049  nfs
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    100003    2  udp  2049  nfs
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    100003    3  udp  2049  nfs
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    100003    4  udp  2049  nfs
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    100005    3  udp  4002  mountd
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    100005    3  tcp  4002  mountd}}
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Then, you need to open the ports 111-2049-4000-4001-4002-4003 tcp and udp.
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== See also ==
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* See also [[Avahi]], a Zeroconf implementation which allows automatic discovery of NFS shares.
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* HOWTO: [[Diskless network boot NFS root]]
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* [http://publib.boulder.ibm.com/infocenter/pseries/v5r3/index.jsp?topic=/com.ibm.aix.prftungd/doc/prftungd/nfs_perf.htm Very helpful]
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* If you are setting up the Arch Linux NFS server for use by Windows clients through Microsoft's SFU, you will save a lot of time and hair-scratching by looking at [https://bbs.archlinux.org/viewtopic.php?pid=523934#p523934 this forum post] first !
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* [http://blogs.msdn.com/sfu/archive/2008/04/14/all-well-almost-about-client-for-nfs-configuration-and-performance.aspx Microsoft Services for Unix NFS Client info]
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* [http://blogs.msdn.com/sfu/archive/2007/05/01/unix-interoperability-and-windows-vista.aspx Unix interoperability and Windows Vista] Prerequisites to connect to NFS with Vista
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Latest revision as of 09:32, 14 September 2013

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