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Help with NFSV4 server
by Clint Dilks 27 Apr '10

27 Apr '10

Hi Everyone, I have been trying to setup an NFS v4 File Server but have come across an odd issue. Mounting the /nfs4exports/share appears to be successful and the information displayed about partition size and free space seem correct but if I try to do anything inside the mounted directory the client will just hang. Does anyone have any idea what I am missing?? I have try disabling all firewalls and selinux but it doesn't seem to make any difference I have taken a look at http://www.brennan.id.au/19-Network_File_System.html#nfs <http://www.brennan.id.au/19-Network_File_System.html#nfs4>4 <http://www.brennan.id.au/19-Network_File_System.html#nfs4> and http://blog.laimbock.com/2009/05/21/nfsv4-on-centos-53-and-fedora-11/ and still can't see what i'm doing wrong {The Server} CentOS 5.4 64 Bit [root@inf1 /]# cat /etc/exports /nfs4exports *.scms.waikato.ac.nz(rw,insecure,sync,wdelay,no_subtree_check,no_root_squash,fsid=0,nohide) /nfs4exports/share *.scms.waikato.ac.nz(rw,insecure,sync,wdelay,no_subtree_check,no_root_squash,nohide) [root@inf1 /]# cat /etc/sysconfig/nfs # # Define which protocol versions mountd # will advertise. The values are "no" or "yes" # with yes being the default #MOUNTD_NFS_V1="no" MOUNTD_NFS_V2="no" MOUNTD_NFS_V3="no" # # # Path to remote quota server. See rquotad(8) #RQUOTAD="/usr/sbin/rpc.rquotad" # Port rquotad should listen on. #RQUOTAD_PORT=875 # Optinal options passed to rquotad #RPCRQUOTADOPTS="" # # Optional arguments passed to in-kernel lockd #LOCKDARG= # TCP port rpc.lockd should listen on. #LOCKD_TCPPORT=32803 # UDP port rpc.lockd should listen on. #LOCKD_UDPPORT=32769 # # # Optional arguments passed to rpc.nfsd. See rpc.nfsd(8) # Turn off v2 and v3 protocol support #RPCNFSDARGS="-N 2 -N 3" # Turn off v4 protocol support #RPCNFSDARGS="-N 4" # Number of nfs server processes to be started. # The default is 8. #RPCNFSDCOUNT=8 # Stop the nfsd module from being pre-loaded #NFSD_MODULE="noload" # # # Optional arguments passed to rpc.mountd. See rpc.mountd(8) #RPCMOUNTDOPTS="" # Port rpc.mountd should listen on. #MOUNTD_PORT=892 # # # Optional arguments passed to rpc.statd. See rpc.statd(8) #STATDARG="" # Port rpc.statd should listen on. #STATD_PORT=662 # Outgoing port statd should used. The default is port # is random #STATD_OUTGOING_PORT=2020 # Specify callout program #STATD_HA_CALLOUT="/usr/local/bin/foo" # # # Optional arguments passed to rpc.idmapd. See rpc.idmapd(8) #RPCIDMAPDARGS="" # # Set to turn on Secure NFS mounts. #SECURE_NFS="yes" # Optional arguments passed to rpc.gssd. See rpc.gssd(8) #RPCGSSDARGS="-vvv" # Optional arguments passed to rpc.svcgssd. See rpc.svcgssd(8) #RPCSVCGSSDARGS="-vvv" # Don't load security modules in to the kernel #SECURE_NFS_MODS="noload" # # Don't load sunrpc module. #RPCMTAB="noload" # [root@inf1 /]# cat /etc/idmapd.conf [General] Verbosity = 9 Pipefs-Directory = /var/lib/nfs/rpc_pipefs Domain = scms.waikato.ac.nz [Mapping] Nobody-User = nfsnobody Nobody-Group = nfsnobody [Translation] Method = nsswitch [root@inf1 /]# mount -l | grep bind /export on /nfs4exports/share type none (rw,bind) And an ls of /nfs4exports/share on NFS Server works from /etc/fstab /export /nfs4exports/share none bind 0 0 {The Client} [root@silver ~]# cat /etc/idmapd.conf [General] Verbosity = 0 Pipefs-Directory = /var/lib/nfs/rpc_pipefs Domain = scms.waikato.ac.nz [Mapping] Nobody-User = nfsnobody Nobody-Group = nfsnobody [Translation] Method = nsswitch From /etc/fstab inf1:/ /test nfs4 auto,rw,nodev,sync,_netdev,proto=tcp,retry=10,rsize=32768,wsize=32768,hard,intr 0 0

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FW: System Resources Graphing
by Simon Billis 26 Apr '10

26 Apr '10

Matt sent a missive on 2010-04-26: > Is there a package I can get that will graph system resources such as > CPU and disk I/O to an html file or something? You could use any of these hyperic, cricket depending on your needs and wants... I use/used cacti, ganglia, mrtg and hyperic... ganglia we currently use to gather performance data and replaced hyperic (better fit for us) and we also use cacti for collecting snmp data from switches and routers. I'm considering switching to cricket in place of cacti for performance reasons (only generates graphs when needed).

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URGENT
by cahit Eyigünlü 26 Apr '10

26 Apr '10

I had a geub loader error 2 on starting centos and i am able to connect rescue system this is the result how could i get system work root@rescuecd64 ~ # grub Probing devices to guess BIOS drives. This may take a long time. Unknown partition table signature GNU GRUB version 0.97 (640K lower / 3072K upper memory) [ Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists the possible completions of a device/filename. ] grub> find /boot/grub/stage1 find /boot/grub/stage1 Error 15: File not found grub>

5 5

USB keys
by m.roth＠5-cent.us 26 Apr '10

26 Apr '10

Well, we wanted to put an install on a USB key. Neither I nor the other admin was amused by the singing and dancing that the wiki offers - and just *why* is it that syslinux is broken? At any rate, I did some googling, and found <http://www.pendrivelinux.com/>, and I ran this installer. Ok, it has some bugs: a) I had several .isos, and it *insisted* on grabbing the first one, alphabetically, no matter that I put in the full name. It also takes for-bloody-ever - 4.5 *hours* for the 4G DVD. However, it finished, I stuck it into a laptop, told it to boot from the USB, and there was the begin install screen. *shrug* Looks good to me. I just do not understand why it's such a song and dance, rather than, say, syslinux /dev/sdb1 mount /dev/sdb1 /tmp/mnt mount -o loop CentOS....iso /mnt cp -pr /mnt/ /tmp/mnt mark

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Sendmail problem
by sync 26 Apr '10

26 Apr '10

Hi, guys:

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Raymonde Haghebaert
by wahyu.darmawan 26 Apr '10

26 Apr '10

http://rahulcoach.com/default/index.php

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creating a local repo
by john maclean 25 Apr '10

25 Apr '10

rsync'ing ain't working for me. Is this the right syntax? rsync -avrt rsync://mirror.ovh.net/centos/5.4/updates/i386 --exclude=debug/ updates/ rsync: getaddrinfo: mirror.ovh.net 873: Temporary failure in name resolution rsync error: error in socket IO (code 10) at clientserver.c(107) [receiver=2.6.8] -- John Maclean 07739 171 531 MSc (DIC) Enterprise Linux Systems Engineer

3 3

IPV6 and DNS...
by John Doe 25 Apr '10

25 Apr '10

Hi, I keep getting entries like these in my logs: network unreachable resolving '0.centos.pool.ntp.org/AAAA/IN': 2001:500:40::1#53: 1 Time(s) network unreachable resolving '0.centos.pool.ntp.org/AAAA/IN': 2001:500:e::1#53: 1 Time(s) network unreachable resolving '0.centos.pool.ntp.org/AAAA/IN': 2001:dc3::35#53: 1 Time(s) I don't see any IPV6 parameters to disable in named.conf, apart from the 'listen-on-v6' which I commented, and the 'query-source-v6' which is commented by default... I disabled IPV6 in the sysconfig files; but not in the modprobe.conf though... Can I just ignore these "errors"? Thx, JD

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OT: Caching synchronous writes
by Ray Van Dolson 24 Apr '10

24 Apr '10

[ Wish there was a generic, active Linux "storage" mailing list out there -- something other than the kernel lists I mean ] To frame the discussion, we use VMware ESX (vSphere) quite a bit with NFS datastores. Often times with NetApp, but lately, more often with Solaris 10 + ZFS + SSD's for ZIL (intent log or write cache). The ZIL lets us use synchronous writes (safer) without the normal delay. Were we to try and get the same level of performance with Linux, we'd need to use async mode for our NFS shares -- and we'd lose some reliability. However, given the latest rumblings and ruminations about Oracle potentially no longer selling entitlements for Solaris 10 on non-Sun hardware -- and then turning around and no longer allowing you to run Solaris 10 "freely", we're left with either OpenSolaris or looking at Linux again (we run Solaris 10 on Silicon Mechanics hardware). My question is, what are the various options for getting NFS in "sync" mode to run fast on Linux? Obviously we can buy a really nice disk controller with lots of cache, but I'm thinking more at the filesystem, volume manager or block driver layer. Is there a way to shunt write requests to a quicker medium like an SLC-based SSD (or NVRAM)? I don't see a way to do this with LVM, ext3/ext4 or even xfs... maybe btrfs will have some options along this line down the road, but that's tomorrow and not today. So is a beefy disk controller our best option? Even using our 3Ware 9650's w/ BBU so we can enable write-back doesn't seem to give us as good of write performance via NFS as ZFS+ZIL-on-SSD does... Ray

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Problem shuting down server.
by Enrique Verdes 24 Apr '10

24 Apr '10

Have Centos 5.3 installed in a HP ML110 server. After cloning disk using Clonezilla, if I issue a shutdown -h now, or any other command to shut down the server (i.e. init 0 or poweroff), instead of shutting down the server reboots. I googled but could't find any answer. ¿Does anybody has a clue about why this is happening? -- Enrique Verdes <EVerdes(a)conatel.com.uy> Depto. de Ingeniería - CONATEL S.A. Este mensaje es privado y confidencial y tiene como único destinatario la persona a la que va dirigida. La responsabilidad de su contenido es del remitente y no de CONATEL. Si usted ha recibido este mensaje por error, tenga presente que le está prohibido revelarlo, copiarlo o distribuirlo, debiendo avisar de inmediato al remitente y borrarlo de su sistema. El error de transmisión no implica renuncia a la privacidad y confidencialidad. This email is private and confidential and intended solely for the use of the individual to whom it is addressed. The responsibility of its content is the sender's and not CONATEL'S. If you have received this email by mistake please notify the sender immediately and delete it from your system. Its disclosure, copy or distribution is absolutely forbidden. The transmission error does not imply a waiver of privacy and confidentiality.

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