Discuss September 2008

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264 participants
315 discussions

CentOS automount 99% CPU utilization -- NFSv3 vs NFSv4?
by Blond Beer 18 Sep '08

18 Sep '08

I have several CentOS 5.2 workstations in a Sun Solaris NIS domain and Solaris NFS servers (all Solaris 8). Frequently the auto mounter hangs with very high utilization -- I think it might be due to the Solaris 8 servers only using NFSv3 and the CentOS wanting to use NFSv4. How can I set the system to use NFSv3 globally, even for auto mount maps from my ancient Solaris NIS domain (which I wold like to upgrade, but that's another story...)

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Run a more recent kernel than 2.6.18 on CentOS?
by Niki Kovacs 18 Sep '08

18 Sep '08

Hi, Usually I'm not one to complain about "old" version of the CentOS kernel and/or software, since I appreciate CentOS' stability. So this might be the exception that confirms the rule. I've been jumping through several burning loops these past days to configure my little MSI Wind netbook, and I'm currently considering going for a more recent kernel. There's no way the Ralink driver for the wireless card will build on an older kernel than 2.6.22, apparently. I'm prepared to do some tinkering, but in the meanwhile, can you give some basic recommendations or caveats? This is not our production database server, so it's not a big deal if it's a little bit less stable. What i naively plan to do: get a kernel SRPM from Fedora 9, try to build from there, and see where it leads. I think I'm going to give it a shot in VirtualBox first. But then, maybe one of you has already gone that path and can tell me if I have to expect something trivial or an experience of the hair-pulling type. Cheers, Niki PS: with similar requests, folks usually suggest I run Fedora. So let me state: I like CentOS. I don't want to run Fedora.

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buying the right cpu fan
by Craig White 17 Sep '08

17 Sep '08

(I sent this yesterday but it never made it through) I've got a remote system where I think I need to replace the CPU fan. in the output of dmidecode, I get... Processor Information Socket Designation: CPU 1 Type: Central Processor Family: <OUT OF SPEC> Manufacturer: Intel ID: 47 0F 00 00 FF FB EB BF Version: Intel(R) Pentium(R) D CPU 2.66GHz Voltage: 1.4 V External Clock: 133 MHz Max Speed: 2666 MHz Current Speed: 2666 MHz is this enough to tell me what kind of fan I need to get? It's obvious it's a Pentium IV. What other command/what other command might I be able to run to parse in order to get information so I get the right CPU fan? Craig

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Setting VNC console port in virt-install
by David Dyer-Bennet 17 Sep '08

17 Sep '08

Using Centos 5.2 with Xen. I'm making a group of nodes behind an LVS load-director to perform computing services. Those nodes are only accessible from the LVS nodes (I'm using LVS NAT mode). Actually it's Xen virtual servers on the physical nodes behind the LVS boxes that I'm mostly concerned with. When you create a guest with virt-install, there's a vnc param and a vncport param, but setting vncport doesn't seem to cause the vnc console to actually appear on the specified port. The config file written by virt-install in /etc/xen doesn't contain the vnc port information. How do I control what port the VNC console is presented on? I need to make these appear at stable port numbers, because to make the systems manageable from outside the LVS, I'm going to create tunnels on the LVS that go to specific system consoles. To set that up obviously the destination ports need to be somehow known, and since they're on different systems, anything other than simply configuring them to be in stable places is going to get complicated and hence unreliable. (The people maintaining the software on the systems behind the LVS won't be the same people in charge of the LVS, and some of them won't even know anything about Linux or Xen, just Windows.) Yes, I also asked on the Xen list; not sure how much what I see as Xen is actually basic Xen and how much is Centos, and the documentation I'm using to do this is all the Centos stuff so I figured I should ask here. -- David Dyer-Bennet, dd-b(a)dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info

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please help LVM totally messed up
by Rudi Ahlers 17 Sep '08

17 Sep '08

Hi all I accidentally deleted a LVM volume directly (rm /dev/System/newcpanel) and now my LVM's are all messed up. I have a snapshot from one of the other LVM's, as follows lvcreate -s -n newcpanel /dev/System/wiseguy -L10G But, instead of running lvremove /dev/System/newcpanel I ran rm /dev/System/newcpanel ( I don't know why) So, now I have waisted space on my server, and I can't remove the original LVM either. root@saturn /]# lvremove /dev/System/wiseguy_rootimg /dev/System/wiseguy_rootimg: read failed after 0 of 4096 at 0: Input/output error /dev/mapper/wiseguy_rootimg1: read failed after 0 of 2048 at 0: Input/output error /dev/mapper/wiseguy_rootimg2: read failed after 0 of 2048 at 0: Input/output error /dev/mapper/wiseguy_rootimg3: read failed after 0 of 2048 at 0: Input/output error Can't remove logical volume "wiseguy_rootimg" under snapshot root@saturn /]# lvscan /dev/System/wiseguy_rootimg: read failed after 0 of 4096 at 0: Input/output error /dev/mapper/wiseguy_rootimg1: read failed after 0 of 2048 at 0: Input/output error /dev/mapper/wiseguy_rootimg2: read failed after 0 of 2048 at 0: Input/output error /dev/mapper/wiseguy_rootimg3: read failed after 0 of 2048 at 0: Input/output error ACTIVE '/dev/System/root' [10.00 GB] inherit ACTIVE '/dev/System/swap' [4.00 GB] inherit ACTIVE '/dev/System/pluto' [50.00 GB] inherit ACTIVE '/dev/System/home' [10.00 GB] inherit ACTIVE '/dev/System/data' [20.00 GB] inherit ACTIVE '/dev/System/andrew_vmswap' [1.00 GB] inherit ACTIVE '/dev/System/andrew_rootimg' [5.00 GB] inherit ACTIVE '/dev/System/keith_vmswap' [1.00 GB] inherit ACTIVE '/dev/System/keith_rootimg' [5.00 GB] inherit ACTIVE '/dev/System/12_vmswap' [1.00 GB] inherit ACTIVE '/dev/System/12_rootimg' [5.00 GB] inherit ACTIVE Original '/dev/System/wiseguy_rootimg' [10.00 GB] inherit ACTIVE Snapshot '/dev/System/oldcpanel' [10.00 GB] inherit -- Kind Regards Rudi Ahlers

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java yum problem
by Ric Moore 17 Sep '08

17 Sep '08

Error: Missing Dependency: /usr/bin/rebuild-security-providers is needed by package java-1.4.2-gcj-compat I'm digging all over the place for this one. Has anyone a clue?? When I use: yum whatprovides /usr/bin/rebuild-security-providers it returns: jpackage-utils.noarch : JPackage utilities I've installed this from several sources. Nothing seems to provide the rebuild thing. I've used mc to looking inside the rpms I've found and none have it. So, I would guess something else does. Thanks, Ric -- ---------------------------------------------------- My father, Victor Moore (Vic) used to say: "There are two Great Sins in the world... ..the Sin of Ignorance, and the Sin of Stupidity. Only the former may be overcome." R.I.P. Dad. Linux user# 44256 Sign up at: http://counter.li.org/ https://nuoar.dev.java.net/ Verizon Cell # 336-254-1339

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Installing & activating mysql in CentOS 5
by Andrew Allen 17 Sep '08

17 Sep '08

I want to set up a local mysql server + client (preferably graphical, ie mysqlgui) so have yum installed both perl-DBI and mysql.i386, both apparently successfully. However, I can't see what to do next to get mysqld running, as it doesn't appear in the list of services (in /etc/init.d/). Help appreciated please - is there any good specific documentation on this anywhere? Also, what's the current opinion/advice on a graphical user interface for mysql please? Andy

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Sierrawireless 597c
by Terry Polzin 17 Sep '08

17 Sep '08

Anyone on the list been able to get one of these to be seen by usb as a modem? lsusb lists it incorrectly, but I can manually load the sierra and usbserial modules. Me thinks they aren't quite up to support for this device yet, Thanks for any input, Terry

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Re: [CentOS] cron job not working
by Al Sparks 17 Sep '08

17 Sep '08

The crond itself is being run as root. I am running the cron job as another user that has permission to run cron jobs. Note that if I change the program to print output to STOUT and run through cron, I get an email in that account with that output. === Al ----- Original Message ---- From: bruce <bedouglas(a)earthlink.net> To: CentOS mailing list <centos(a)centos.org> Sent: Tuesday, September 16, 2008 4:25:23 PM Subject: RE: [CentOS] cron job not working hey al... what are the privs that the cron is being run as. the cron should be root. what are the acls for the dir that you're writing to?? it's probably a simple priv/acl issue.... -----Original Message----- From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org]On Behalf Of Al Sparks Sent: Tuesday, September 16, 2008 5:01 PM To: Centos List Subject: [CentOS] cron job not working Here's a perl script that works when I run it manually. But when I run it via cron, it won't create the directory. But worse than that, an email isn't sent to the account running the job. So I'm not getting an error, but it does work when I run it manually. If I put an obvious error in the script, cron does generate an email giving me the STDERR. What could it be? === Al #!/usr/bin/perl ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time); # Above functions, "time" and "localtime", return weird $year and $month # Need to be converted to become human readable $year = $year + 1900; $mon = $mon + 1; # Want $mday and $mon to be 2 digits, with leading zero if necessary $mday = "0" . $mday if $mday < 10; $mon = "0" . $mon if $mon < 10; # Second parameter is mask in octal chdir "/ora-local/db-test-backups"; mkdir "${year}_${mon}_${mday}", \00022; ####End perl script _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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OT: Unix/Linux Training Online
by Matt 17 Sep '08

17 Sep '08

This is a bit off topic but I was interested in taking some online classes. I currently have an associates degree in electronics tech from about 15 years back but was wanting to expand on that and learn more about linux. Oreillyschool.com has a somewhat affordable online certificate course in UNIX/linux admin. The downside is I do not know if there credits would ever transfer if I wanted to build on that. Has anyone taken there course or know anyone that did? Is it worth a hoot? Is there a better option? Is a simple certificate worth that much anyway? Matt

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Discuss September 2008