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• Handling packet impersonating in client-server model online game

  - by TheDespite

  I am designing a server-client model game library/engine. How do I, and should I even bother to handle frequent update packet possible impersonating? In my current design anyone could copy a packet from someone else and modify it to execute any non-critical action for another client. I am currently compressing all datagrams so that adds just a tad of security. Edit: One way I thought about was to send a unique "key" to the verified client every x_time and then the client has to add that to all of it's update packets until a new key is sent. Edit2: I should have mentioned that I am not concerned about whether the actions described in the packet are available to the client at the time, this is all checked by the server which I thought was obvious. I am only concerned about someone sending packets for another client.

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• NFS and KVM. Slow Speed

  - by Javier Martinez

  I have a KVM virtualization in Debian with 2 guests (Debian and Windows 2008). I want to have a 'mount point' shared that can be accessed by the 3 system (host and 2 guests) at the same time. So the only thing that I found was a NFS/SMB network storage. I picked NFS Due to my Ethernet network (10/100), the speed average that I get between accessing/transfering files between the 3 system is always 8~10MB/s. The point is if is there any chance of get a boost system for sharing files between 3 system (at the same time) without wasting the speed of my SATA disks. I mean, without the Ethernet limitation of 10 MB/s

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• Slow NFS transfer performance of small files

  - by Arie K

  I'm using Openfiler 2.3 on an HP ML370 G5, Smart Array P400, SAS disks combined using RAID 1+0. I set up an NFS share from ext3 partition using Openfiler's web based configuration, and I succeeded to mount the share from another host. Both host are connected using dedicated gigabit link. Simple benchmark using dd: $ dd if=/dev/zero of=outfile bs=1000 count=2000000 2000000+0 records in 2000000+0 records out 2000000000 bytes (2.0 GB) copied, 34.4737 s, 58.0 MB/s I see it can achieve moderate transfer speed (58.0 MB/s). But if I copy a directory containing many small files (.php and .jpg, around 1-4 kB per file) of total size ~300 MB, the cp process ends in about 10 minutes. Is NFS not suitable for small file transfer like above case? Or is there some parameters that must be adjusted?

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• Getting ZFS per dataset IO statistics (or NFS per export IO statistics)

  - by jkj

  Where do I find statistics about how IO is divided between zfs datasets? (zpool iostat only tells me how much IO a pool is experiencing.) All the relevant datasets are used through NFS, so I'd be happy with per export NFS IO statistics also. We're currently running OpenIndiana [edit] It seems that operation and byte counter are available in kstat kstat -p unix:*:vopstats_??????? ... unix:0:vopstats_2d90002:nputpage 50 unix:0:vopstats_2d90002:nread 12390785 ... unix:0:vopstats_2d90002:read_bytes 22272845340 unix:0:vopstats_2d90002:readdir_bytes 477996168 ... ...but the strange hexadecimal ID numbers have to be resolved from /etc/mnttab (better ideas?) rpool/export/home/jkj /export/home/jkj zfs rw,...,dev=2d90002 1308471917 Now writing a munin plugin to use the data...

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• suddenly cannot mount nfs share from Windows 7

  - by bing

  I recently reinstalled my file server (moved from fedora to Ubuntu server). Now I cannot mount my nfs share from Windows 7, mounting from Mac OSX works fine. In Windows I either keep getting "the semaphore timeout period has expired" or "an unexpected error has occured". Does Ubuntu need some special magic to allow Windows 7 to mount an nfs share? This is my exports file /home/Bing/ 192.168.1.*(rw,async,insecure,no_subtree_check) /home/Bing/mnt/EXTRN2 192.168.1.*(rw,async,insecure,no_subtree_check) /home/Bing/mnt/EXTRN3 192.168.1.*(rw,async,insecure,no_subtree_check)

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• NFS Client reports Permission Denied, Server reports Permission Granted

  - by VxJasonxV

  I have two RedHat 4 Servers. The client is 4.6, the server is 4.5. I'm attempting to mount a share from the server, onto the client via NFS. The /etc/exports configuration is as follows: /opt/data/config bkup(rw,no_root_squash,async) /opt/data/db bkup(rw,no_root_squash,async) exportfs returns these (among other) shares, nfs is running according to ps output. I've been attempting to use autofs on the client, but have opted to just mount the share manually considering the issues I'm having. So, I issue the mount request: mount dist:/opt/data/config /mnt/config mount: dist:/opt/data/config failed, reason given by server: Permission denied Ok, so let's see what the server has to say for itself. May 6 23:17:55 dist mountd[3782]: authenticated mount request from bkup:662 for /opt/data/config (/opt/data/config) It says it allowed the mount to take place. How can I diagnose why the client and server are disagreeing on the result?

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• Disabling file permissions on NFS share

  - by user41377

  I am trying to set up a nfs share for use by non-technical users, and really don't want file permissions messing things up. Everyone should be able to read/write anything on this share without even knowing what file permissions are, much less adjusting them. Is there a way I can just make the nfs server write everything as 770 or something? It seems like this should be easy, but the best I can come up with is a cronjob to periodically set them to that, which is far from ideal. The server is a Netgear ReadyNAS. Ideally I would like to stick to doing stuff from within the web interface on it, but I can just root it if needed.

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• NFS share access - Permission denied

  - by rgngl

  I'm trying to share a directory on my NAS device(WD Mybook WE) with NFS to another machine on my local network. The directory on the NAS device looks like this: drwxr-x--- 15 git git 4096 Nov 17 01:05 git/ And id's of the user git on the NAS device is like this: [root@myhost DataVolume]# id git uid=505(git) gid=505(git) I played with many different parameters in the /etc/exports file and this is what I got there currently: /DataVolume/git 192.168.0.20(async,rw,no_root_squash,no_subtree_check) On the client side I have the user git and group git with the same id's to match the ones on the server. user@myclient:~$ id git uid=505(git) gid=505(git) groups=505(git) I mount the directory with: sudo mount myhost:/DataVolume/git -t nfs git/ and the mounted directory looks like: drwxr-x--- 15 git git 4096 Nov 17 01:05 git After these steps I can't seem to cd to that directory with any user, including git and root. I am getting a Permission denied error. Thanks in advance for any help.

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• www-data is unable to write to an NFS share

  - by Bastian

  On Debian Squeeze, I created an NFS share with these options rw,sync,no_root_squash,no_subtree_check,insecure and on the other Debian Squeeze I can successfully mount it and read write with root, but this share is intended to be used by Apache. I changed the permission to 777 just to make sure. And still, the www-data user can read, create files but not write to them! It does not sound to me like the typical permissions problem, maybe something related to NFS, a lock problem that I am not aware of. Any idea is welcome.

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• SMTP Client implementation [on hold]

  - by orif

  I'm implementing SMTP client. What should the client do once it already sent the "." at the end of the mail, but didn't receive "250 Ok"? This is how the conversation between the client and server look like: Server Response: 220 www.sample.com ESMTP Postfix Client Sending : HELO domain.com Server Response: 250 Hello domain.com Client Sending : MAIL FROM: <[email protected]> Server Response: 250 Ok Client Sending : RCPT TO: <[email protected]> Server Response: 250 Ok Client Sending : DATA Server Response: 354 End data with <CR><LF>.<CR><LF> Client Sending : Subject: Example Message Client Sending : From: [email protected] Client Sending : To: [email protected] Client Sending : Client Sending : TEST MAIL Client Sending : Client Sending : . Server Response: 250 Ok: queued as 23411 Client Sending : QUIT I'm not sure what should I do if the client sends "." and doesn't receive the 250 Ok - because of possible network error. Was the "." sent or not? Should the client resend the mail - and - maybe - duplicate the item, or not - and risk in losing an important mail item? Thank you.

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• NFS Issues in Gnome

  - by Alex

  I mount NFSv4 export via /etc/fstab and mount and use the shared folder in nautilus. There are two issues: When I copy a large file (around 4 GB) to the NFS server, the progress bar rapidly goes to 2 GB and then basically stops moving. But the copy s still in progress - it is just not displayed well When I disconnect from the network without unmounting the nfs share, nautilus freezes. How can I work around that? /etc/export on the server /export/share 192.168.0.0/24(rw,sync,insecure,no_subtree_check,anonuid=1000,anongid=1000) /etc/fstab on the client: server:/share /mnt nfs4 soft,tcp

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• suddenly cannot mount nfs share from windows 7

  - by bing

  I recently reinstalled my file server (moved from fedora to ubuntu server). Now I cannot mount my nfs share from windows 7, mounting from mac osx works fine. In windows I either keep getting "the semaphore timeout period has expired" or "an unexpected error has occured". Does ubuntu need some special magic to allow windows 7 to mount an nfs share? This is my exports file /home/bing/ 192.168.1.*(rw,async,insecure,no_subtree_check) /home/bing/mnt/EXTRN2 192.168.1.*(rw,async,insecure,no_subtree_check) /home/bing/mnt/EXTRN3 192.168.1.*(rw,async,insecure,no_subtree_check)

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• NFS of NAS server blocks in cluster environment

  - by Zardoz

  In our department we have an Iomega NAS (px4-300d) connected to a Supermicro cluster with 5 nodes (12 cores per node). Each node mounts a share on that NAS by using NFS. Unfortunately after some time (several minutes) of permanent read/write operations (from all nodes) the NAS starts to block and a bit later freezes completely. We tried several options of the mount command, but nothing helped (async, intr, wsize, rsize). The NAS itself doesn't allow many options (better to say none). Do you have any recommendation how to integrate a NAS using NFS in a cluster environment?

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• Fastest security check of file tree on NFS

  - by fungs

  I am currently experiencing very bad performance using the following on an NFS network folder: time find . | while read f; do test -L "$f" && f=$(readlink -m $f); grp="$(stat -c %G $f)"; perm="$(stat -c %A $f)"; done Question 1) Within the loop permissions are checked using the variables grp and perm. Is there a way to lower the amount of disc I/O for these kind of checks over the network (e.g. read all meta data at once using find)? Question 2) It seems like the NFS isn't tuned very well, the same operation on a similar network link via SSHFS take only one third of the time. All parameters are auto-negotiated. Any suggestions?

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• KVM guest storage difference with NBD and NFS

  - by WojonsTech

  I am setting up my own little private cloud for my own use maybe for a project or to. I am using linux kvm on debian 6. I have 3 servers 2 of them for compute nodes and 1 storage node. I would I have already installed kvm made a few test machines got my networking setup. I have 2 nics on each server 1 nic is for web traffic other nic is for network traffic. My first Idea was to use NFS for storing the guest machines which can range in size, maybe 8gb maybe 100gb, it just depends. I was doing have heard of nbd before seems like it could work but I dont know what the performance differences are and if it will effect my enviroment, nfs looks like it will be easier to use.

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• Export NFS path containing "-" (dash)

  - by qdot

  I'm in a bit of a pinch with NFS exports file. Specifically, I can't find a way to export a directory containing "-" in the path name. Manual (exports(5)) states: Also, each line may have one or more specifications for default options after the path name, in the form of a dash ("-") followed by an option list. The option list is used for all subsequent exports on that line only. It then states: If an export name contains spaces it should be quoted using double quotes. You can also specify spaces or other unusual character in the export name using a backslash followed by the character code as three octal digits. Unfortunately, that is not the case. Specifically, if the pathname contains "-", either verbatim, or with \055 or is enclosed in double quotes, it still refers to the name without "-" Any ideas? I have a large number of directories, all of the form /vol/buildsystem-s3c2440 /vol/buildsystem-tao3530 and I'd prefer to have them all available as nfs exports. Short of replacing the "-" with "_" everywhere in the scripts, can it be done with "-" ?

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• NFS high CPU usage

  - by user269836

  Hello, I have a very strange issue. I have next server: Intel(R) Xeon(TM) MP CPU 3.16GHz cat /proc/cpuinfo | grep proce | wc -l 8 free -m total used free shared buffers cached Mem: 28203 27606 596 0 10789 9714 -/+ buffers/cache: 7103 21100 Swap: 24695 0 24695 RAID card *-storage description: RAID bus controller product: MegaRAID vendor: LSI Logic / Symbios Logic physical id: 7 bus info: pci@0000:13:07.0 logical name: scsi2 version: 01 width: 32 bits clock: 66MHz capabilities: storage pm bus_master cap_list rom configuration: driver=megaraid latency=32 resources: irq:134 memory:d8ff0000-d8ffffff(prefetchable) memory:df600000-df60ffff(prefetchable) HDD: 10x148Gb SCSI U320 15k - RAID5 /dev/sdb1 807G 674G 93G 88% /storage /dev/sdb1 /storage ext4 defaults,usrjquota=aquota.user,grpjquota=aquota.group,jqfmt=vfsv0,noatime,nodiratime,noacl,errors=remount-ro 0 1 network cards ethtool -i eth0 driver: tg3 version: 3.116 firmware-version: 5704-v3.36, ASFIPMIc v2.36 bus-info: 0000:10:02.0 ethtool -i eth1 driver: tg3 version: 3.116 firmware-version: 5704-v3.36, ASFIPMIc v2.36 bus-info: 0000:10:02.0 ifconfig bond0 Link encap:Ethernet HWaddr 00:0f:1f:ff:d6:4d inet addr:192.168.15.71 Bcast:192.168.15.255 Mask:255.255.255.0 inet6 addr: fe80::20f:1fff:feff:d64d/64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU:1500 Metric:1 RX packets:1062818202 errors:0 dropped:3918 overruns:0 frame:0 TX packets:1041317321 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:10000 RX bytes:258867684559 (241.0 GiB) TX bytes:396569192650 (369.3 GiB) this server running only nfs-kernel-server uname -a Linux nas2-backup 2.6.32-5-amd64 #1 SMP Sun Sep 23 10:07:46 UTC 2012 x86_64 GNU/Linux Debian 6. What do I have, once per day or two, LA goes up, it can be reached around LA: 40 but if I do: nfs-kernel-server restart. Every thing is OK. But on the next day or a little bit later, LA goes up again. Servers are connected to d-link dgs 1016d with 24 GBits ports. I have tried everything to find out what the problem is. Why it's happening, but still I can not resolve this issue. Any ideas on what is happening here?

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• mount nfs subdirectory and still apply parent directory permissions

  - by Christophe Drevet

  A NFS server exports : /export/home computers /export/cont1 computers On the filesystem, there are these permissions : $ ls -al /export/cont1 drwxr-x--- 6 root group1 4096 2010-05-04 10:57 . drwxrwxrwx 5 root root 4096 2010-05-07 14:52 .. drwxrwxrwx 2 root root 4096 2010-05-06 20:33 .snapshot drwxr-xr-x 2 user1 group1 4096 2010-05-04 10:57 user1 drwxr-xr-x 2 user2 group1 4096 2010-05-04 10:57 user2 drwxr-xr-x 2 user3 group1 4096 2010-05-04 10:57 user3 So that user4, which is in not in the group1 can't access this directory and its subdirectories. Now, on its client machine, this user can do : $ sudo mount server:/export/cont1/user3 /mnt/temp and then access the directory without permissions on /export/cont1 : $ id uid=7943(user4) gid=7943(user4) groupes=1189(group4) $ ls -al /mnt/temp/ drwxr-xr-x 3 user3 group1 4096 2010-05-04 10:57 . drwxr-xr-x 7 root root 4096 2010-05-04 11:02 .. -rw-r--r-- 1 user3 group1 6 2010-05-04 10:56 README Is there a way to apply /export/cont1 permissions even if it is not mounted ? The goal is to enable users to mount /home/user3 and only access it if they can access /export/cont1 on the nfs server. Said in another way : how can I allow a machine to mount /export/cont1/user3 and still don't allow user4 to access it. Maybe NFSv4 and Kerberos can help ?

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• thought about shared storage (NFS, Lustre) [closed]

  - by user134880

  Possible Duplicate: Can you help me with my capacity planning? Now I habe small cluster with total of 8 nodes. 6 of them are computing nodes (apache and vmware) and 2 nodes are for storage. 2 storage nodes are identical. Each storage server is linux box with 8 x 1Tb WD RE4 in soft raid 10. 1st box is master and 2nd is slave. Data is mirrored with DRDB. We export NFSv4 shares to Apache (for document root) and iSCSI to Vmware. Now all is working pretty good and stable. But it will be soon time to upgrade our system. I have been thinking of Lustre. Does some one has any real experience with Lustre or NFS medium clusters? Will it be good idea just to upgrade server and change hdd's to 3Tb ? With NFS we will always have only 2 servers to maintain (one primary and one slave). Thanks. QUESTIONS: 1) Does some one used Lustre? In production? I have seen a lot of info about how it is hard to setup Lustre because you need to compile own kernel and patches. It's answers from newbies. Is there some one who has used Lustre for some period of time? 2) About disk upgrades - it's only description of strategy. I'm not asking if it is enough 3Tb or not. I just ask if it is right just to replace hdds instead of adding new server (like with Lustre) Thanks again.

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• Networking Client Server Packet logic (How they communicate)

  - by Trixmix

  I want to know what is the logic behind server client communication through packets for a real time game. for example the server sends x packets then the client receives x packets and processes them.. Basically what is the process to keep the client and server in sync and able to receive and send packets. more in depth example of what I want to know: client step 1 wait for a packet step 2 read x packets step 3 process x packets step 4 send x packets and so on... I need to know the very basic outline of the communication. Big questions are: 1) do I send and read packets all at one time? i.e for loop though the incoming packets array list and read them all or one every server loop or what... 2) what order should I do things i.e first receive then read then process then send etc.. 3) what I asked above a step by step of what the server / client should do.. Thanks!

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• Is NFS capable of preserving order of operations?

  - by JustJeff

  I have a diskless host 'A', that has a directory NFS mounted on server 'B'. A process on A writes to two files F1 and F2 in that directory, and a process on B monitors these files for changes. Assume that B polls for changes faster than A is expected to make them. Process A seeks the head of the files, writes data, and flushes. Process B seeks the head of the files and does reads. Are there any guarantees about how the order of the changes performed by A will be detected at B? Specifically, if A alternately writes to one file, and then the other, is it reasonable to expect that B will notice alternating changes to F1 and F2? Or could B conceivably detect a series of changes on F1 and then a series on F2? I know there are a lot of assumptions embedded in the question. For instance, I am virtually certain that, even operating on just one file, if A performs 100 operations on the file, B may see a smaller number of changes that give the same result, due to NFS caching some of the actions on A before they are communicated to B. And of course there would be issues with concurrent file access even if NFS weren't involved and both the reading and the writing process were running on the same real file system. The reason I'm even putting the question up here is that it seems like most of the time, the setup described above does detect the changes at B in the same order they are made at A, but that occasionally some events come through in transposed order. So, is it worth trying to make this work? Is there some way to tune NFS to make it work, perhaps cache settings or something? Or is fine-grained behavior like this just too much expect from NFS?

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• Check if NFS share is mounted in python script

  - by Fabian

  I wrote a python script that depends on a certain NFS share to be available. If the NFS share is not mounted it will happily copy the files to the local path where it should be mounted, but fail later when it tries to copy some files back that were created on the NFS server. I'd like to catch this error specifically so I can print a useful error message that will tell the users of this script what they have to do. My first idea would be to execute mount using subprocess and then check the output for this nfs share. But I'm wondering if there isn't a nicer and more robust method of doing it.

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• NFS mount share from Linux AD authentication to Linux with NIS authentication

  - by user137862

  I have two machines: Linux with AD authentication and running NFS server Linux with NIS authentication Problem: When I try to mount any share from first machine (AD authentication) to second (NIS authentication) I always get somehing like this drwxrws---+ 13 16777260 16777222 4096 Sep 21 09:42 software In fact I can't access to this folder because on NIS machine I don't have the user with such UID/GID Question: May somebody know how resolve this problem?

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• NFS automounts hang

  - by Yang

  Hi, I have been mounting NFS shares on my x86 Ubuntu with NIS/am-utils fine for a long time, but today my system got into a state where it could no longer access automounted directories and instead frequently got hung up trying to access them, returning either "Input/output error" or "Permission denied" (almost randomly), as well as "stale file handle." I can, however, manually mount that share fine. Restarting am-utils doesn't help get my system out of its funk; is there any other way of getting my system un-stuck?

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• (Amazon AWS) EBS mount error: Stale NFS file handle

  - by May

  I have an EC2 instance that just went offline (cannot even be pinged) but is still reflected as operational. In an effort to retrieve data stored on an attached EBS, I did a forced detach of the mounted volume, launched a new instance, and tried attaching the EBS volume. However, I keep getting an error - mount: Stale NFS file handle whenever I do so. Did I just lose all my files?

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