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• How to I set up nfs using the Drobo Unfsd app?

  - by Jan Aagaard

  How do I set up my nfs on my Drobo FS so that I can connect to it from my Mac using the NFS protocol? I have downloaded and installed Unfsd program from the DroboApps page. My exports file looks like this: /mnt/DroboFS/Shares 192.168.1.0/255.255.255.0(rw,no_root_squash) I try to connect to the share by hitting Ctrl+K in Finder and the using nfs://drobo-fs.local/Shares as server address. But when I click Connect all that happens is that the Connect to Server window flashes shortly, and well, that's all. I have tried removing the /Shares part, using /Public and casing drobo-fs.local as Drobo-FS.local, but it's all with the same result. I have also tried using /mnt/DroboFS/Shares *(rw,no_root_squash) in the exports file. I restart the service using the command ./service.sh restart.

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• Easy way to update apache on a server cluster with shared NFS conf?

  - by Simon

  we have a server setup where a server cluster connected with a db/files/conf server shared by nfs serve our sites, behind an Elastic Load Balancer at Amazon EC2. The setup works correctly, but keeping it up to date is becoming like hell, because the apache/php conf that webservers use is shared through NFS. So, if we try to run an apt-get upgrade on a server on the cluster, it will abort it due to the webserver is not able to write back the configuration to the nfs server. Every time we want to update the machines, or install a package like php-curl, we need to create a new ami, so the changes will reflect on the new launched amis. Could it be another way of doing the things simpler? Thanks in advance!

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• What is the "real" difference between a NAS and NFS?

  - by warren

  From an end-user perspective, what is the difference between a NAS device and using NFS exports from a file server? They seem to accomplish the same end result. The difference between a SAN and other file storage is related (in my experience) to how they are connected to the server infrastructure. However, the difference between a NAS, connecting over standard ethernet, and NFS (sharing storage off specific servers, also over the network), seems more nebulous. Is there a good reason to pick a NAS filer over NFS on servers?

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• I try to access a NFS mount via FTP. It works but the FTP Dir listing is very slow

  - by W0bble

  I mount an NFS using this command: mount -o rsize=8192,wsize=8192,timeo=14,intr serverip:/directory /mnt/directory However the mount appears on the client as expected a cmd like "ls -a" work pretty fast on the nfs mount. But when I try to list the mounted directory via FTP it gets very very slow ( 1.250 bytes in 160,39s (0,01KB/s) ). But surprisingly downloading files via FTP from nfs work with normal speeds. I tested several values for rsize and wsize parameter with no success. Both client and server are running Debian squeeze and NFSv4

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• Merge home directory after fresh installation with existing (Gentoo) home

  - by jhwist

  I reinstalled my desktop machine with Ubuntu 10.10., coming from Gentoo where I used XFCE. My home is usually NFS-mounted from a server. During the install I let the installer set up my user, but of course my NFS-home wasn't mounted then; I have a regular /home/user now. If I mv /home /home.old and mount my NFS-home to /home instead, I cannot login because Gnome complains about some config-files (sorry, no exact error message as there is no way to copy&paste this). Which of my /home.old/user directories do I have to copy over to my NFS-home so that Gnome is happy again?

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• How to create a shared folder using command line on a server

  - by sadmicrowave

  After following the tutorial here I ran into a problem. Here is what I did. On my server I installed nfs-kernel-server and edited the /etc/exports file to include the folder I want to share: /var *(rw,sync) On my client machine I edited my fstab file to include share: //128.251.xxx.xxx/var/ ~/uslonsweb003 nfs #username=[username],password=[password], 0 0 Entered command: sudo mount -a which gives this error: mount.nfs: remote share not in 'host:dir' format Where did I go wrong with this setup? Also if there is a better way (using command line) to setup a folder share on an Ubuntu 10.10 server that will be accessed by other linux and windows machines please let me know. UPDATE: The mapped drive is now not letting me create,edit,delete files or folders (readonly access) my configuration is as follows: client fstab file: 128.251.xxx.xxx:/var /home/coreyf/uslonsweb003 nfs rw,hard,intr, 0 0 server exports file: /var *(rw,no_root_squash,sync,no_subtree_check) UPDATE 2: Using Allans solution my drive mounted correctly however after putting rw,intr as my additional parameters I cannot create, edit and delete folders/files.

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• When specifying an NFS mountpoint in /etc/fstab, What is the "addr" option for?

  - by lorin

  When specifying an NFS mountpoint in /etc/fstab, what's the purpose of the addr option? For example: 192.168.1.5:/home /home nfs rw,addr=192.168.1.5 0 0

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• How to restart (or stop or heck even start) the nfs client service on ubuntu 9.10?

  - by Denali

  The /etc/init.d/nfs-common file has been removed. There is no nfs service utility. Any help greatly appreciated.

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• Is there a way to do something like LVM over NFS?

  - by warren

  I realize that since NFS is not block-level, LVM can't be used directly. However: is there a way to combine multiple NFS exports (from, say, 3 servers) into one mount point on a different server? Specifically, I'd like to be able to do this on RHEL 4 (or 5, and re-export the combined mount to my RHEL 4 server). expansion The reason I pegged lvm is that I want a bunch of exported mounts (servera:/mnt/export, serverb:/mnt/export, serverc:/mnt/export, etc) to all mount at /mnt/space so that my /mnt/space on this server (serverx) as one large filesystem. Yes, I know that re-exporting is generally a Bad Thing™ but thought it might work, if there was a way to accomplish this on a newer release as opposed to an older one From reading the unionfs docs, it appears that I can't use it over a remote connection - have I misread it? More accurately, since Union FS merges the contents of multiple branches, but makes them appear as one, it doesn't seem to go in reverse: I'm trying to mount a bunch of NFS points in a merged fashion, then write to them - not caring where data goes, a la LVM .

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• How do I speed up and cache mmap file access over NFS on Linux?

  - by Zan Lynx

  The server and client are both 64-bit Ubuntu 10.04 LTS. The application in question is a custom app that uses mmap() for fast random file access. Its ideal state is when the entire file is cached in RAM. The network connections are really fast 10Gb Ethernet. It is a virtual server blade setup. It isn't the network connections slowing things down because everything performs superbly when using a virtual disk (iSCSI to the SAN). But when we run the application on a NFS home directory mount, performance goes to the dogs. It appears that the Linux kernel isn't caching anything. So it is reading every single disk block needed by mmap() accesses over and over and over again. The NFS mount is done through autofs, which has only default settings. /proc/mounts shows the NFS mount is done with the following options: rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.11.52,mountvers=3,mountproto=tcp,addr=192.168.11.52 How can I make Ubuntu 10.04 cache the file instead of reloading it all the time?

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• Setup for mounting kerberized nfs home directory - gssd not finding valid kerberos ticket

  - by janm

  Our home directories are exported via kerberized nfs, so the user needs a valid kerberos ticket to be able to mount its home. This setup works fine with our existing clients & server. Now we want to add some 11.10 client and thus set up ldap & kerberos together with pam_mount. The ldap authentication works and users can login via ssh, however their homes can not be mounted. When pam_mount is configured to mount as root, gssd does not find a valid kerberos ticket and the mount fails. Nov 22 17:34:26 zelda rpc.gssd[929]: handle_gssd_upcall: 'mech=krb5 uid=0 enctypes=18,17,16,23,3,1,2 ' Nov 22 17:34:26 zelda rpc.gssd[929]: handling krb5 upcall (/var/lib/nfs/rpc_pipefs/nfs/clnt2) Nov 22 17:34:26 zelda rpc.gssd[929]: process_krb5_upcall: service is '<null>' Nov 22 17:34:26 zelda rpc.gssd[929]: getting credentials for client with uid 0 for server purple.physcip.uni-stuttgart.de Nov 22 17:34:26 zelda rpc.gssd[929]: CC file '/tmp/krb5cc_65678_Ku2226' being considered, with preferred realm 'PURPLE.PHYSCIP.UNI-STUTTGART.DE' Nov 22 17:34:26 zelda rpc.gssd[929]: CC file '/tmp/krb5cc_65678_Ku2226' owned by 65678, not 0 Nov 22 17:34:26 zelda rpc.gssd[929]: WARNING: Failed to create krb5 context for user with uid 0 for server purple.physcip.uni-stuttgart.de Nov 22 17:34:26 zelda rpc.gssd[929]: doing error downfall When pam_mount is on the other hand configured with the noroot=1 option, then it cannot mount the volume at all. Nov 22 17:33:58 zelda sshd[2226]: pam_krb5(sshd:auth): user phy65678 authenticated as [email protected] Nov 22 17:33:58 zelda sshd[2226]: Accepted password for phy65678 from 129.69.74.20 port 51875 ssh2 Nov 22 17:33:58 zelda sshd[2226]: pam_unix(sshd:session): session opened for user phy65678 by (uid=0) Nov 22 17:33:58 zelda sshd[2226]: pam_mount(mount.c:69): Messages from underlying mount program: Nov 22 17:33:58 zelda sshd[2226]: pam_mount(mount.c:73): mount: only root can do that Nov 22 17:33:58 zelda sshd[2226]: pam_mount(pam_mount.c:521): mount of /Volumes/home/phy65678 failed So how can we allow users of a specific group to perform nfs mounts? If this does not work, can we make pam_mount use root but pass the correct uid?

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• How to get more NFS packet details from Wireshark?

  - by Joe Swanson

  How can I get Wireshark to give me details about NFS packets at this level of granularity? (as exemplified here here) Specifically, I am interesting in looking at the the "Stable" option toward the bottom. When I analyze captured packets (whether by capturing directly via Wireshark, importing from a tshark dump, or importing from a tcpdump dump), I do not see a "Network File System" section in the packet details. I only get general TCP information. It recognizes that a packet is destined for a NFS port, but I am not able to see these details. Any ideas?

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• What's the best way to mitigate NFS and sudo?

  - by user225874

  Quick background: We have 40 workstations running Linux. NFS is used extensively for bulk data storage and home directories. This allows users to roam freely will relatively transparent file systems. This is an educational environment where postdocs and students have successfully pulled off a coup of sorts. All have gained root on their individual workstations by grooming a technophobic PI who thinks IT people are evil. If I so much as suggest chroot or sudo restrictions, I'll find myself working out of a broom closet. With that in mind, what's the best way to mitigate something like this below? $ hostname workstation1 $ whoami john $ sudo su jane $ whoami jane $ cp -R /home/nfs/jane /mnt/thumbdrive/

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• Rsync over NFS with QoS: How to view real transfer speed?

  - by Ian Mackinnon

  We have a bandwidth limit between a Linux server and a NAS, created using 'tc' with an IP filter. When writing to an NFS mount of the NAS, rsync claims a very high transfer speed for each file and then waits a long time before acknowledging that everything has finished. The total time taken is consistent with the QoS limit and the time taken by the same transfer over FTP. Why does the write to the NFS mount report higher transfer speeds than are actually happening over the network? How can I monitor the actual bandwidth of the transfer?

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• Can't `mount -o loop` an ISO from an NFS share (RHEL)

  - by warren

  I have a large NFS share with a variety of software ISOs on it. I've only tried this on Red Hat Enterprise Linux, but when trying to do the following, the mount comes back with an error indicating no permissions to mount. Why would this be happening? NFS is mounted thusly: mediaserver:path/to/isos /media/nfs This is the mount call that fails mount -o loop /media/nfs/product.iso /tmp/product If I copy the ISO, there is no issue. The NFS share is mounted rw. How can I loop mount the ISO from the NFS share without copying it first?

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• Weird nfs performance: 1 thread better than 8, 8 better than 2!

  - by Joe

  I'm trying to determine the cause of poor nfs performance between two Xen Virtual Machines (client & server) running on the same host. Specifically, the speed at which I can sequentially read a 1GB file on the client is much lower than what would be expected based on the measured network connection speed between the two VMs and the measured speed of reading the file directly on the server. The VMs are running Ubuntu 9.04 and the server is using the nfs-kernel-server package. According to various NFS tuning resources, changing the number of nfsd threads (in my case kernel threads) can affect performance. Usually this advice is framed in terms of increasing the number from the default of 8 on heavily-used servers. What I find in my current configuration: RPCNFSDCOUNT=8: (default): 13.5-30 seconds to cat a 1GB file on the client so 35-80MB/sec RPCNFSDCOUNT=16: 18s to cat the file 60MB/s RPCNFSDCOUNT=1: 8-9 seconds to cat the file (!!?!) 125MB/s RPCNFSDCOUNT=2: 87s to cat the file 12MB/s I should mention that the file I'm exporting is on a RevoDrive SSD mounted on the server using Xen's PCI-passthrough; on the server I can cat the file in under seconds ( 250MB/s). I am dropping caches on the client before each test. I don't really want to leave the server configured with just one thread as I'm guessing that won't work so well when there are multiple clients, but I might be misunderstanding how that works. I have repeated the tests a few times (changing the server config in between) and the results are fairly consistent. So my question is: why is the best performance with 1 thread? A few other things I have tried changing, to little or no effect: increasing the values of /proc/sys/net/ipv4/ipfrag_low_thresh and /proc/sys/net/ipv4/ipfrag_high_thresh to 512K, 1M from the default 192K,256K increasing the value of /proc/sys/net/core/rmem_default and /proc/sys/net/core/rmem_max to 1M from the default of 128K mounting with client options rsize=32768, wsize=32768 From the output of sar -d I understand that the actual read sizes going to the underlying device are rather small (<100 bytes) but this doesn't cause a problem when reading the file locally on the client. The RevoDrive actually exposes two "SATA" devices /dev/sda and /dev/sdb, then dmraid picks up a fakeRAID-0 striped across them which I have mounted to /mnt/ssd and then bind-mounted to /export/ssd. I've done local tests on my file using both locations and see the good performance mentioned above. If answers/comments ask for more details I will add them.

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• nfs mountpoint named ``share'' breaks ls and man

  - by freddyb

  I mounted a nfs server to ~/share. This works fine as long as I'm at home, where the nfs share is in reach. Whenver I'm not, this seems to break access to all manpages. Using man (or ls in my homedir) waits forever. Checking with strace reveals that they try to access the folder called share. Unmounting fails too. Even with -l (lazy) and -f (force). I am asking for three things here: Is ``share'' a magic name? Does something like MANPATH exist, which I should avoid? How do I unmount without rebooting? (I already commented the share out in fstab) What would you suggest me to do, to have network/position based mounting of NFS shares?

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• How to synchronize a whole Ubuntu?

  - by Avio

  I think that the time is ripe to have my whole Ubuntu synchronized just as my Dropbox folder is. Given that we are always talking about files and directories, what's the difference between my Documents folder and my /usr system directory? Almost none, except for their location. In fact, I think that there is just one big issue that prevents people to have their beloved installations mirrored wherever they go: symlinks. Dropbox, Google Drive, Ubuntu One, Sugarsync, Skydrive, none of these services support symlinking. This means that if I push a symlink in one of the synced folders, locally the symlink is kept as is, but remotely (in the cloud or on the other synced machines) the symlink is resolved to the actual file that was originally pointed to. This completely disrupts Linux installations, thus these services can't be used for this purpose. So the question is. Does anybody knows a way to achieve this? A whole Ubuntu, always synchronized with a remote running copy, but still locally stored on both disks? My best guess is that I could use NFS. But the main difference between Dropbox and NFS is that NFS is a remote filesystem that always forces to remotely access the files, while Dropbox pushes modifcations to local filesystems (and thus would perform better). I've also heard about NFS caching. Does anybody knows if this solution could approximate Dropbox in this sense? P.s. I know that /boot, /dev, /proc, /run, /tmp and device-specific mountpoints in /mnt and /media will have to be left out the sync mechanism. What I'm interested in is the principle. Can this be done with reasonable performance, having reasonable resources (e.g. ~ 1Mbps upload bandwidth and a public IP address)?

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• [tcp] :/: RPCPROG_NFS: RPC: Program not registered

  - by frankcheong

  I tried to share the root / from a fedora 9 to a freeBSD while when I tried to mount the / folder it complained with "[tcp] nfs_server:/: RPCPROG_NFS: RPC: Program not registered". I followed the below steps to setup on the fedora nfs server:- Add the below line inside the /etc/exports / nfs_client(rw,no_root_squash,sync) restart the nfs related service service portmapper restart service nfslock restart service nfs restart export the filesystem using the below command:- exportfs -arv On the nfs client, I have troubleshoot using the below command:- rpcinfo -p nfs_server program vers proto port service 100000 2 tcp 111 rpcbind 100000 2 udp 111 rpcbind 100024 1 udp 32816 status 100024 1 tcp 34173 status 100011 1 udp 817 rquotad 100011 2 udp 817 rquotad 100011 1 tcp 820 rquotad 100011 2 tcp 820 rquotad 100003 2 udp 2049 nfs 100003 3 udp 2049 nfs 100021 1 udp 32818 nlockmgr 100021 3 udp 32818 nlockmgr 100021 4 udp 32818 nlockmgr 100005 1 udp 32819 mountd 100005 1 tcp 34174 mountd 100005 2 udp 32819 mountd 100005 2 tcp 34174 mountd 100005 3 udp 32819 mountd 100005 3 tcp 34174 mountd showmount -e nfs_client Exports list on nfs_server: / nfs_client What else did I missed?

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• Server load high, CPU idle. NFS the cause?

  - by Mech Software

  I am running into a scenario where I'm seeing a high server load (sometimes upwards of 20 or 30) and a very low CPU usage (98% idle). I'm wondering if these wait states are coming as part of an NFS filesystem connection. Here is what I see in VMStat procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------ r b swpd free buff cache si so bi bo in cs us sy id wa st 2 1 0 1298784 0 0 0 0 16 5 0 9 1 1 97 2 0 0 1 0 1308016 0 0 0 0 0 0 0 3882 4 3 80 13 0 0 1 0 1307960 0 0 0 0 120 0 0 2960 0 0 88 12 0 0 1 0 1295868 0 0 0 0 4 0 0 4235 1 2 84 13 0 6 0 0 1292740 0 0 0 0 0 0 0 5003 1 1 98 0 0 4 0 0 1300860 0 0 0 0 0 120 0 11194 4 3 93 0 0 4 1 0 1304576 0 0 0 0 240 0 0 11259 4 3 88 6 0 3 1 0 1298952 0 0 0 0 0 0 0 9268 7 5 70 19 0 3 1 0 1303740 0 0 0 0 88 8 0 8088 4 3 81 13 0 5 0 0 1304052 0 0 0 0 0 0 0 6348 4 4 93 0 0 0 0 0 1307952 0 0 0 0 0 0 0 7366 5 4 91 0 0 0 0 0 1307744 0 0 0 0 0 0 0 3201 0 0 100 0 0 4 0 0 1294644 0 0 0 0 0 0 0 5514 1 2 97 0 0 3 0 0 1301272 0 0 0 0 0 0 0 11508 4 3 93 0 0 3 0 0 1307788 0 0 0 0 0 0 0 11822 5 3 92 0 0 From what I can tell when the IO goes up the waits go up. Could NFS be the cause here or should I be worried about something else? This is a VPS box on a fiber channel SAN. I'd think the bottleneck wouldn't be the SAN. Comments?

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• What does a connection timeout indicate when performing an NFS mount?

  - by DeeDee

  We have a shiny new QNAP NAS (TS-879U-RP), and I'm trying to mount it to our big ol' RHEL server in the same manner as our other two QNAP NAS devices. The IT department won't give me the root privileges to the NAS, so I can't SSH in (I know, I know). The first thing I did was to, via the QNAP web admin interface, create a network share named "Runs." I then added the IP of the RHEL server to the permissions list: On the RHEL server, I then added the following line to /etc/fstab: [IP of NAS]:/Runs /mnt/gsrnas3 nfs defaults 0 0 Aside from the IP and the specific mount directory name, this is how I mounted the other two NAS devices. I then created the gsrnas3 directory under /mnt/, and then ran `mount /mnt/gsrnas3' I got the following error: mount.nfs: Connection timed out My first thought is that it's a ports issue, but I don't have enough specific experience with this issue to know for sure. I have two other NAS devices by the same manufacturer already mounted to this RHEL server, so that leads me to believe the configuration issue is on the NAS side of things. I can ping the NAS device successfully from the RHEL server. Not being able to SSH into said NAS is a huge hassle, though. Any ideas?

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• File permissions issue with an NFSv4 share, uploaded from a Mac Lion

  - by POP.sicle

  I have an NFSv4 share that was working fine, with Macs using Snow Leopard, to share files across the network. The NFS share has one cloned user/group that all clients autoconnect as. However, when I use a Lion Mac to copy a file from their user directory to the NFS, no other computer (mac SL/mac Lion/Win7) can edit/delete/write to the file that was uploaded - despite having the correct read/write/ex permissions visible on the NFS and through terminal. Attempting to edit the file permissions through Finder completely locks the file. I suspect this has something to do with Lion's ACLs (or maybe its version control) conflicting with NFSv4. Is there a way to disable or ignore extended ACLs or extended file permissions on the NFSv4 side, that would allow users to not run into this conflict? The work around currently is to use NFS Manager and set automounts to ignore ownership but installing NFS manager and configuring automounts for all of the computers seems more troubling than attempting to reconfigure the NFS settings. Advice?

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• NFSv4 with idmap

  - by HTF

  The following errors appear on the NFS server, could you please advise how I can fix this? Details: System: CentOS release 6.4, NFS: nfs-utils-1.2.3-36 # cat /etc/idmapd.conf [General] Domain = domain.com [Mapping] Nobody-User = nobody Nobody-Group = nobody [Translation] Method = nsswitch Sep 3 08:25:28 snode1 rpc.idmapd[1382]: nss_getpwnam: name '0' does not map into domain 'domain.com' Sep 3 08:25:29 snode1 rpc.idmapd[1382]: nss_getpwnam: name '500' does not map into domain 'domain.com' EDIT: 03 Sep 2013 10:41 Please note that I'm using NFSv4 and these errors appear on NFS server only (not NFS clients). Server: # cat /etc/sysconfig/nfs MOUNTD_NFS_V2="no" MOUNTD_NFS_V3="no" ... RPCNFSDARGS="-N 2 -N 3" Clients: # cat /etc/fstab server:/ /data nfs4 defaults,hard,intr,timeo=15,_netdev,noatime,nodiratime,nosuid 0 0

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• How can I mount a Synology DS212?

  - by Vigo

  I Have installed Ubuntu 11.10 and want to mount a synology ds212. I can see the diskstation in de filebrowser (before mounting with nfs) but can not open it. I've tried to mount it with nfs but no succes. Everything should be right at the Synology (nfs is on and maps are selected), and I've added a line in fstab. If I type sudo mount -a I dont't get an error. If I go to the mounted map I can't see anything in it..... What is going wrong? maybe router? Hope someone can help..!

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• Ubuntu 11.10 mounting Synology DS212 problems

  - by Vigo

  I Have installed Ubuntu 11.10 and want to mount a synology ds212. I can see the diskstation in de filebrowser (before mounting with nfs) but can not open it. I've tried to mount it with nfs but no succes. Everything should be right at the Synology (nfs is on and maps are selected), and I've added a line in fstab. If I type sudo mount -a I dont't get an error. If I go to the mounted map I can't see anything in it..... What is going wrong? maybe router? Hope someone can help..!

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