- Discuss - lists.centos.org

tools one could to use to troubleshoot for Apache
by Agnello George 23 Aug '10

23 Aug '10

Have a question , Suppose i had a client tell me that he can access the web page but it takes long time to view the pages the website is a static website ( suppose this website does not server dynamic data or does not connect to a database )... what would one check other than : the server load ( cat /proc/loadaverage ) , the Apache logs , the number of client connection ( netstat -tupln |grep :80 |wc -l ) -- how would i know if it a client side issue or a server side issue ........ -- Regards Agnello D'souza

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server is extremly slugish - unable to troubleshoot..
by Roland RoLaNd 23 Aug '10

23 Aug '10

Dear all, I have a virtual machine with the following specs: Core 2 DUO 3.2 GHZ 4 GB RAM hdd: IDE 320 GB 32 bit OS: centos 5.2 I'm using it for local development with a number of Virtual hosts, and a big mysql database. the prob: At times, with no specific reason. system becomes extremly slugish. http requests takes forever to be served. Even ssh connections takes time to connect, and a simple command such as "clear" takes anywhere between 3 to 10 seconds to execute. i've checked TOP, over and over again and it's always within the following: CPU load average is max 10 % , and at that specific time it's never above 30 % RAM: swap is never used, there's always around 1.5 GB of free memory so it's not a matter of CPU nor RAM. so my next thought were that HDD is maxing out on the hosting physical server. i checked on the physical server, and HDD I/O is within normal range. and other VMs workign on the same physical server are running smoothly.. so what can i do more to troubleshoot? this is happening more than it should without any scenario in common. any advice on how to troubleshoot would be greatly appreciated... PS: any command that may show I/O in KB/MB on the HDD ?

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how to install oracle 10 on the centos?
by ganu MailList 23 Aug '10

23 Aug '10

I do know how to set the kernel parameters on the /etc/sysctl.conf file.

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SDA and HDA
by Matt 22 Aug '10

22 Aug '10

With the default settings in my Supermicro motherboard CentOS calls my SATA drive /dev/hda. If in bios setup I change 'Native Mode Operation' from auto to 'Serial ATA' it boots up calling the drive /dev/sda. I keep thinking its likely better under /dev/sda not? Any problem switching it to that after install? Matt

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rexec error - where are you
by aurfalien＠gmail.com 22 Aug '10

22 Aug '10

Hi all, I've a particular host on my network that when I run; rexec -l username -p password remotehost command it just hangs. When I do; rexec -a -l username -p password remotehost command i get; Where are you? If I do; rexec -l username -p password localhostname (not just localhost but its actual name) command it works. Any ideas would be very appreciated. - aurf

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Guidance on Linux Kernel/OS Programming for Beginners
by linux-crazy 22 Aug '10

22 Aug '10

Hi List, I am working on LINUX for the past six years , and am a core linux guys since i started my career on linux . Working more on Redhat / centos / Fedora based distribution system administration . with some basic bash scripting knowledge. Now am looking to deep dive into programming to contribute or innovate some thing new on linux operating system or kernel space (More importantly on kvm virtualization front since am an expert on virtualization). So i need your guidance to start my new career on linux programming front . As of now am planned to start with below sequences . C C++ Linux kernel Programming python Java Kindly provide me some good web links or beginner to advanced docs for the above languages to start , also correct me if am wrong any where . Awaiting for your valuable input Regards, lingu

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Guidance on Linux Kernel/OS Programming for Beginners
by linux-crazy 22 Aug '10

22 Aug '10

Hi List, I am working on LINUX for the past six years , and am a core linux guys since i started my career on linux . Working more on Redhat / centos / Fedora based distribution system administration . with some basic bash scripting knowledge. Now am looking to deep dive into programming to contribute or innovate some thing new on linux operating system or kernel space (More importantly on kvm virtualization front since am an expert on virtualization). So i need your guidance to start my new career on linux programming front . As of now am planned to start with below sequences . C C++ Linux kernel Programming python Java Kindly provide me some good web links or beginner to advanced docs for the above languages to start , also correct me if am wrong any where . Awaiting for your valuable input Regards, lingu

1 0

securing a remotely hosted machine
by Karanbir Singh 22 Aug '10

22 Aug '10

Hi, I'm looking to put together a doc for the wiki.c.o on howto secure a remotely hosted machine. Its a situation that many of us find ourselves in, wherein we either lease or colo a server ( or many ) and there is always the issue of remote hands, other facility users etc being able to get physical access of the machines. So what are the usual steps that people take in order to secure their remote-hosted-servers. A short list of things that I tend to always do is : - disable all getty's - make grub boot imediately with no user interrupt possible - put sensitive data on a locally encrypted disk - plumb in a bios password - have all console redirected to a iLo / drac / ipmi2 device; if there is one of those - if not then redirect the output to a non-existing ttySX port ( isnt ideal! ) - disable all telnet and http/https access to the ilo / drac interfaces, ensure impi is secured. What other, reasonable, steps should one consider ? the end result, ofcourse, is to still have the option of handing passwords etc to the DC ops should there be a need to actually work on the machine remotely. so removing the keyb and display interfaces might not be desirable. - KB

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Re: [CentOS] how to check the number of thread on apache server
by Chuck Munro 22 Aug '10

22 Aug '10

> Subject: Re: [CentOS] how to check the number of thread on apache > server > To: CentOS mailing list<centos(a)centos.org> > Message-ID: > <AANLkTi=5hQOOw3t2qgD9-HLH6XNC+F8OZtHc5HPxNsLS(a)mail.gmail.com> > Content-Type: text/plain; charset=ISO-8859-1 > > On Fri, Aug 20, 2010 at 7:02 PM, Kwan Lowe<kwan.lowe(a)gmail.com> wrote: > >> On Fri, Aug 20, 2010 at 1:57 PM, Agnello George >> <agnello.dsouza(a)gmail.com> wrote: >> >>> how to check the number of thread? on my ? Apache server? ,? is there a >>> specific command , and how do i increase these threads .. >>> >>> > If you are talking about worker threads. Turn on server-status in the > httpd.conf (make sure security is set correctly), and check > http://serverip/server-status. > Slightly OT .... FWIW .... One quick-and-dirty way to check threads for any process is to use the ncurses-based 'htop' utility. I much prefer this to 'top' for several reasons, including its ability to hide/display kernel threads, hide/display user threads (in a different color if you like), display with vertical and horizontal scrolling, assign processor affinity on the fly, ptrace/strace processes, and a lot more. It's in Dag Wieers' rpmforge repository for CentOS. The suggestions offered in this discussion are all very useful with regard to tuning Apache. Chuck

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how to check the number of thread on apache server
by Agnello George 22 Aug '10

22 Aug '10

how to check the number of thread on my Apache server , is there a specific command , and how do i increase these threads .. -- Regards Agnello D'souza

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Install CentOS with degraded raid
by Daniel Bareiro 21 Aug '10

21 Aug '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all! I'm making a text mode installation of CentOS 5.5 on a single disk on which I intend to put a software RAID-1 degraded, thinking of adding another disk later on. But if I try to make the installation in a RAID-1 with a single disk, the system does not allow it. There is any way to do it? Thanks in advance for your replies. Regards, Daniel -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkxtmTAACgkQZpa/GxTmHTeoZACePFQ5FYVrQZkbqRUsVwXHJ073 rlYAn2UNupZ24wHd0AfsPwRoXsZbcQuM =cTyl -----END PGP SIGNATURE-----

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dual heads, Radeon
by m.roth＠5-cent.us 21 Aug '10

21 Aug '10

Dell OptiPlex 980, Radeon HD 4550 xorg figures it should use the r500 driver. I start with no /etc/X11/xorg.conf. It comes up, mirroring. I use the gnome applet - the same thing, btw, with system-config-display - tell it to use dual head, and spanning desktops. Exit X. Restart, and the second monitor goes into powersave mode. Try to exit X, either via logout, or <ctrl><alt><bkspace>, and it goes, and comes back with a bluish screen... and that's all she wrote. It's hung so hard I can't log in via ssh, and have to power cycle it. Any clues? mark

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The system is pseudo dead when hang-up system in the centos 5.3 .
by ganu MailList 21 Aug '10

21 Aug '10

When I hang-up the system, then the screem is black. But the power light is brightness. and the disk light is bright sometimes. When I press any key, the screem is still black. Only can do is to press down power button for several seconds to power off the notebook. Is there the bug of the Centos?

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Load at 5, no CPU I/O or swap in use
by Ed Donahue 20 Aug '10

20 Aug '10

We are currently running CentOS 5 update 4 on a Dell R910 server 16 cores/32 hyperthreaded with 64GB of memory. It is our main Oracle 11g DB server for one of our customers and is attached to an MD 3000 storage array. We are having a load averaging around 5 but see no swap in use, CPUs are pretty much idle and no I/O wait. We have Oracle dataguard turned on in transactional mode. I've checked everything that I can think of, there are no Oracle processes running which would cause a spike. Anyone have any ideas as to what to check next? I have another R910 configured the same way and do not see any issues with the 3 databases running on that server. The load is at .5.

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CentOS 4 Kernel Update
by Ramon Nieto 20 Aug '10

20 Aug '10

When this kernel update be released for CentOS 4? http://rhn.redhat.com/errata/RHSA-2010-0606.html Thank you.

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can i config/build/boot a new kernel on centos 5.5 with LVM?
by Robert P. J. Day 20 Aug '10

20 Aug '10

(disclaimer: i'll be a bit vague about some of this since i don't have a test system to try to reproduce it until later today or this weekend.) during a RHEL SA course i was teaching this week, i was using both centos 5.5 and RHEL 6.0 beta 2 and, as a fun exercise, i was showing how to "git" checkout the kernel source tree, configure it, build, install and boot to a new kernel. sadly, at no time did that exercise actually work, so i just want to ask a general question -- should i, with a standard install of centos 5.5 with all of the required development packages, be able to checkout the kernel source, and build and boot a new kernel? upon reflection, the issues might have to do with the fact that LVM was in use and perhaps the initrd didn't have LVM support built in but, again, i can't check that until later today at the earliest. so, here's the hypothetical scenario i'm going to test later: * gateway, 64-bit laptop, with 64-bit centos 5.5, fully updated * /boot is primary ext4 partition * / and /home are logical volumes in a single volume group * "git clone" latest kernel source * "make defconfig" * "make" * "make modules_install" * "make install" is there any reason why the above shouldn't work? (and instead of "make defconfig", i can copy the /boot/config file for the stock kernel and "make oldconfig". i'll almost certainly try both just to cover all the possibilities.) so ... should this theoretically work? is there a web page that actually walks through the process? because we were having all kinds of grief just installing the kernel or booting and failing to find the root device (which is why i suspect something LVM-related.) i'm open to suggestions. thanks. rday p.s. obviuosly, i'd love to hear that someone else has already done this and it worked just fine. -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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system shutdown - turning off quotas takes a long time
by Götz Reinicke - IT Koordinator 20 Aug '10

20 Aug '10

Hi, recently I had to instal a new raid storage system for our central fileserver. It is connected by iscsi (1Gbit) and the fielsystems mounted are 400GB and 1TB and ext3. curretly about 400 GB are used by 1.5 Mio files. I turned quota on and did a quota check. BUT on reboot the system crashes/hangs during 'turning off quotas' This message shows up about 30++ sec after the shutdown ... Any idea? Hint? Suggestion? The storage is an SUN 7110 with SAS drives. The Server Centos 5.5. fresh install, recent updates. Thanks and best regards. Götz -- Götz Reinicke IT-Koordinator Tel. +49 7141 969 420 Fax +49 7141 969 55 420 E-Mail goetz.reinicke(a)filmakademie.de Filmakademie Baden-Württemberg GmbH Akademiehof 10 71638 Ludwigsburg www.filmakademie.de Eintragung Amtsgericht Stuttgart HRB 205016 Vorsitzende des Aufsichtsrats: Prof. Dr. Claudia Hübner Geschäftsführer: Prof. Thomas Schadt

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Understanding FS ACLs
by Silviu Hutanu 20 Aug '10

20 Aug '10

I have problem understanding FS ACLs.Can someone explain me why the following behaviour occur? Let's suppose that we have a /shared directory we want to give rwx access to admins group. setfacl -m d:g:admins:rwx shared [root@rh1 /]# getfacl shared # file: shared # owner: root # group: root user::rwx group::r-x other::--- default:user::rwx default:group::r-x default:group:admins:rwx default:mask::rwx default:other::--- [root@rh1 /]# su - jack [jack@rh1 ~]$ id uid=500(jack) gid=507(admins) groups=507(admins) context=root:system_r:unconfined_t:SystemLow-SystemHigh [jack@rh1 ~]$ cd /shared/ -bash: cd: /shared/: Permission denied

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Which disk file format are you used in removable disk between xp and linux ?
by ganu MailList 20 Aug '10

20 Aug '10

The centos can not recognize the NTFS file format and my xp system can not format the removable disk to fat32. Which the disk format are you used if you want to share the data between xp and linux system?

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SCIM service does not start
by sync 20 Aug '10

20 Aug '10

Hi ,guys : I reboot my computer which is installed the CentOS 5.4 64 bits just now and find that SCIM service does not start And the error message is these: root@test <root@camlit> ~: tailf /var/log/message xxxx scim-bridge: Another agent is running .. xxx scim-bridge: Failed to allocate the agent . Exitting .... .... .... I also run this command "ps aux |grep scim " to pick up which process use the scim service and kill that , but that problem is as before . So what could I do ? thanks in advance .....

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Installing on Intel EFI system
by Mayhall, Anthony J. (MSFC-ES53)[Dynamic Concepts Inc.] 20 Aug '10

20 Aug '10

Can I install CentOS 5.4 on an Intel based system that is not an Itanium system? The system BIOS has support for EFI and can boot to an EDI shell. Thanks, Anthony Mayhall

2 2

Two display cards problem
by ganu MailList 20 Aug '10

20 Aug '10

My Thinkpad notebook has two the same display card. It is installed with Windows XP system and CentOS 5.3. When I reboot from CentOS to xp, the display card driver of windows xp is broken. I guess if the display card is switched in the CentOS? How to let these two system use the same display card?

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odd situation slightly off topic (sending file descriptors to another process)
by Jerry Geis 20 Aug '10

20 Aug '10

I have coded up the standard sendfd() and recvfd() for linux to send and recv file descriptors. seems to work (http://book.chinaunix.net/special/ebook/addisonWesley/APUE2/0201433079/ch17…) however when I recvfd() my number of open file descriptors bumps by 2 and not 1. (using lsof -p X | wc -l) I am not sure why the count jumps by 2 and not 1. The sendfd() is just sending a socket descriptor. If I close() the provided descriptor it only closes 1 handle (again using lsof above). So my recvfd() is giving me 2 but when I close() I only drop 1 and not 2. Something is not in alignment and just wondering if someone can shed some light on this. Thanks. Jerry

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dmesg- bnx2i: iSCSI not supported, dev=eth0
by David 19 Aug '10

19 Aug '10

Getting "bnx2i: iSCSI not supported, dev=eth0" for all the NIC adapters on all of my R710's running CentOS 5.5. Here is an sample of the error messages: bonding: Warning: either miimon or arp_interval and arp_ip_target module parameters must be specified, otherwise bonding will not detect link failures! see bonding.txt for details. bonding: bond0: setting mode to active-backup (1). bonding: bond0: Setting MII monitoring interval to 500. ADDRCONF(NETDEV_UP): bond0: link is not ready bonding: bond0: Adding slave eth0. bnx2: eth0: using MSIX bnx2i: iSCSI not supported, dev=eth0 bonding: bond0: enslaving eth0 as a backup interface with a down link. bnx2i: iSCSI not supported, dev=eth0 bonding: bond0: Adding slave eth2. bnx2: eth2: using MSIX bnx2i: iSCSI not supported, dev=eth2 bnx2: eth0 NIC Copper Link is Up, 1000 Mbps full duplex bonding: bond0: enslaving eth2 as a backup interface with a down link. bnx2i: iSCSI not supported, dev=eth2 bonding: bond0: link status definitely up for interface eth0. bonding: bond0: making interface eth0 the new active one. bonding: bond0: first active interface up! bonding: bond0: link status definitely up for interface eth2. ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready bonding: bond0: link status definitely down for interface eth2, disabling it bnx2: eth2 NIC Copper Link is Up, 1000 Mbps full duplex bonding: bond0: link status definitely up for interface eth2. bond0: no IPv6 routers present Understanding that bnx2i is used for hardware iscsi, why is this error occurring? David

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how to setup account which can 'su" to another account (NON-root)?
by mcclnx mcc 19 Aug '10

19 Aug '10

we have CENTOS 5.2 on DELL server. we need allow a user can "su" to another user without password. for example: account user1 can "su - user2" without password. (user2 is NOT root) I know this is big security risk but .... Anyone know how to do it? Thanks.

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too many open files
by Jerry Geis 19 Aug '10

19 Aug '10

I am getting an error about to many open files. I tried to "echo 500000 > /proc/sys/fs/file-max" The number is there now, but I continue to get the error. Is there something else to do? Jerry

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Power failure diagnosis?
by Mark 19 Aug '10

19 Aug '10

This morning between 07:10 or so and 08:10 I discovered that my PC had shut itself off. I thought it was due to a power failure becuase I never turn it off without a good reason, and it had been running (and playing sounds) until it wasn't. My roommate/landlord tells me that the only anomaly he observed was that our router had lost its internet connection (via a cable modem, which was still running fine), and his computer, a laptop, and clocks all seemed to be running normally. I checked all the logs in /var/log and there's nothing in there other than the restart - no temp warnings or anything. The machine has been up and running smoothly since the last time I shut it off (to move), a week ago last Friday (8/6). I don't have a UPS or BB, so is there any way that I can diagnose this further? Here's another weird thing - 'dmesg | grep Aug' shows this: Linux version 2.6.18-194.11.1.el5 (mockbuild(a)builder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Tue Aug 10 19:05:06 EDT 2010 EDAC MC: Ver: 2.0.1 Aug 10 2010 EDAC amd64_edac: Ver: 3.2.0 Aug 10 2010 That's probably when I last restarted after installing the new kernel. But: $ date Wed Aug 18 11:52:23 PDT 2010 And /var/log/messages shows this: : Aug 18 06:35:57 marichter dhclient: DHCPREQUEST on eth0 to 192.168.0.2 port 67 Aug 18 06:35:57 marichter dhclient: DHCPACK from 192.168.0.2 Aug 18 06:35:57 marichter dhclient: bound to 192.168.0.100 -- renewal in 5154 se conds. Aug 18 06:44:28 marichter smartd[3829]: Device: /dev/sdb, 4294967295 Currently u nreadable (pending) sectors Aug 18 06:44:28 marichter smartd[3829]: Device: /dev/sdb, 4294967295 Offline unc orrectable sectors Aug 18 08:10:45 marichter syslogd 1.4.1: restart. Aug 18 08:10:45 marichter kernel: klogd 1.4.1, log source = /proc/kmsg started. Aug 18 08:10:45 marichter kernel: Linux version 2.6.18-194.11.1.el5 (mockbuild@b uilder10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-48)) #1 SMP Tue Aug 10 19:05:06 EDT 2010 : What's up with that??? (Not the disk issue - that's a Seagate problem that, fortunately, means nothing, and yes, I've gone through that one before....) Why doesn't dmesg show the most recent boot? marichter 2.6.18-194.11.1.el5 #1 SMP Tue Aug 10 19:05:06 EDT 2010 x86_64 GNU/Linux centos-release-5-5.el5.centos.x86_64 Thanks. Mark

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What is the best strategy for updating CentOS from 4 to 5?
by Todd Cary 18 Aug '10

18 Aug '10

No doubt I have waited just a little too long, but I think it is time to upgrade before it is not supported. My server is not heavily used (mostly for viewing images) and my Admin skills are better than beginner but NOT guru. Todd -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

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Re: [CentOS] Wrong disk size problem.
by Semih Gokalp 18 Aug '10

18 Aug '10

Thanks all. I will check and read this option. > On 18 August 2010 10:37, Laurent Wandrebeck <l.wandrebeck(a)gmail.com> wrote: >> On Wed, 18 Aug 2010 10:18:39 +0300 >> Semih Gokalp <semihgokalp(a)gmail.com> wrote: >> >>> Hi,we have Centos 5.4 server and according to me we have strange problem. >>> >>> Disk size and other indormation like below.Normally,md2 partition >>> should have 46GB free disk size but available value is zero.Why it >>> show zero ? If you help me,I will be happy. >>> >> <snip> >> Answer is probably in reserved blocks for root. >> See tune2fs -m option. >> HTH, >> -- >> Laurent >> > > > > -- > Iyi calismalar.Basarilar... > Semih Gokalp > Istanbul/Turkiye > -- Iyi calismalar.Basarilar... Semih Gokalp Istanbul/Turkiye

1 0

Wrong disk size problem.
by Semih Gokalp 18 Aug '10

18 Aug '10

Hi,we have Centos 5.4 server and according to me we have strange problem. Disk size and other indormation like below.Normally,md2 partition should have 46GB free disk size but available value is zero.Why it show zero ? If you help me,I will be happy. df -h Filesystem Size Used Avail Use% Mounted on /dev/md1 19G 2.1G 16G 12% / /dev/md2 880G 834G 0 100% /data /dev/md0 243M 24M 208M 11% /boot tmpfs 2.0G 0 2.0G 0% /dev/shm df -k Filesystem 1K-blocks Used Available Use% Mounted on /dev/md1 19840804 2215556 16601112 12% / /dev/md2 922019416 874435436 0 100% /data /dev/md0 248783 23904 212035 11% /boot tmpfs 2057656 0 2057656 0% /dev/shm df -i Filesystem Inodes IUsed IFree IUse% Mounted on /dev/md1 5124480 44654 5079826 1% / /dev/md2 237961216 42010 237919201 1% /data /dev/md0 64256 45 64211 1% /boot tmpfs 514414 1 514413 1% /dev/shm mdadm --detail /dev/md2 /dev/md2: Version : 0.90 Creation Time : Mon Jun 8 18:14:31 2009 Raid Level : raid1 Array Size : 951827072 (907.73 GiB 974.67 GB) Used Dev Size : 951827072 (907.73 GiB 974.67 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 2 Persistence : Superblock is persistent Update Time : Wed Aug 18 10:01:27 2010 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0 UUID : a0bf9972:b46617a2:bf37d07b:5d34b930 Events : 0.51 Number Major Minor RaidDevice State 0 8 2 0 active sync /dev/sda2 1 8 18 1 active sync /dev/sdb2

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how to use dhcpd and bind with windows 2008 ad domain model?
by Eero Volotinen 18 Aug '10

18 Aug '10

This might be a bit offtopic, but: How to run bind and dhcpd as slave on windows 2008 ad domain. Is it possible? -- Eero, RHCE

4 4

Date drift and ntpd
by Jason Pyeron 17 Aug '10

17 Aug '10

We have a local time server and all of our machines are pointed at it for the time. How can the clock drift by a day and a half? [root@devserver21 ~]# date Fri Aug 13 14:43:29 EDT 2010 [root@devserver21 ~]# rdate -s 192.168.1.67 [root@devserver21 ~]# date Thu Aug 12 07:02:39 EDT 2010 [root@devserver21 ~]# cat /etc/ntp.conf | grep -v ^# | grep -v ^$ restrict default nomodify notrap noquery restrict 127.0.0.1 server 192.168.1.67 server 192.168.1.66 server 192.168.1.65 server 127.127.1.0 # local clock fudge 127.127.1.0 stratum 10 driftfile /var/lib/ntp/drift broadcastdelay 0.008 keys /etc/ntp/keys -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.

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apache rewrite
by Craig White 17 Aug '10

17 Aug '10

Is there some easy way to rewrite just the base URL to another URL but leave all other URL's unmolested? i.e. http://www.example.com = rewrite to another URL http://www.example.com/files = deliver from the assigned subdirectory obviously this... Redirect / http://www.other_url.com redirects everything and I don't want /files to be redirected Craig -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

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kernel: bnx2i: iSCSI not supported, dev=ethX
by David 17 Aug '10

17 Aug '10

Running CentOS 5.5 x86_64 on Dell R710 boxes. I have the server(s) configured for bonding/vlan and will be using iscsi to a SAN. I am in the pre-deployment stage so I am just setting up the basic cookie cutter configurations so I haven't initiated the iscsi connection to a SAN yet. While going through the error messages I noticed this error: kernel: bnx2i: iSCSI not supported, dev=ethX. First time I have seen this error while configuring previous Dell servers, though I noticed most of my older boxes are using the tg3 module for the onboard NIC's. Has anyone run into this error message and if so does it means what it says....iSCSI not supported for the target device? Thanks, David

3 2

When does %POST kick in in Kickstart?
by Jacob Brown 17 Aug '10

17 Aug '10

Okay, this is really simple but because Google has deteriorated in quality over time, it's getting really hard to find straight forward answers. Very simple; when does the %POST section of the Kickstart file kick in during the install process? Before or after the first reboot? Hopefully this gets picked up easy by the spiders...

3 2

Mark facility in CentOS
by Daniel Bareiro 16 Aug '10

16 Aug '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all! This is my first message to the list. Some time ago I'm user of Debian GNU/Linux and recently I also started to use CentOS GNU/Linux. Does anyone know how to enable the mark facility on CentOS? According to what I was seeing, unlike Debian GNU/Linux, which uses rsyslog, CentOS still uses the traditional syslog where the parameters to be passed to the daemon are taken from /etc/sysconfig/syslog and the default configuration is: SYSLOGD_OPTIONS="-m 0" So, no time stamps are added. As I watched in the man pages for syslog, I tried removing the zero assuming it would take the default of 20 minutes, but I get a error message suggesting to put a numerical value following the "-m". I tried also with "-m 20" and nothing happens. Same result if, besides that, I put in the /etc/syslog.conf: *.info;mail.none;authpriv.none;cron.none,mark.* /var/log/messages ^^^^^^ aggregate Any idea what might be missing? Thanks in advance for your reply. Regards, Daniel -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (GNU/Linux) iEYEARECAAYFAkxomwUACgkQZpa/GxTmHTfQvQCgi2LlLgwDbBlHBrx7NEakqkwk 2SsAniEylf0DvoWCKVvZf9xpdc2m2R9j =eOlp -----END PGP SIGNATURE-----

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how many folks are *seriously* using ACLs?
by Robert P. J. Day 16 Aug '10

16 Aug '10

i'm just curious -- how many people here are using ACLs as a regular and significant part of their sys admin? rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

7 8

best ways to do mysql backup
by Agnello George 16 Aug '10

16 Aug '10

we have multiple servers approx 10 and each has about 100 GB of data in the /var/lib/mysql dir , excluding tar , mysqldump and replication how do we take backup for these databases on to a remote machine and store them datewise , ( the remote machine is a 2TB HDD ) currently tar is not feasible as the data is too huge and the same goes with mysqldump suggestion will be of great help -- Regards Agnello D'souza

10 11

Ethernet Quad
by Daniel Bruno 16 Aug '10

16 Aug '10

Hello, Someone can indicate some Ethernet device Quad 10/100 to use with CentOS 5.x? Thanks, -- Daniel Bruno http://danielbruno.eti.br

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Yum broken after x86_64 upgrade
by listmail 16 Aug '10

16 Aug '10

Hi All, I just upgraded a machine from CentOS 5.3 32-bit to CentOS 5.5 x86_64 using the updater on the release disk. Now that the machine is running 64-bit, I notice that Yum is broken, failing with the following error: ~~~ There was a problem importing one of the Python modules required to run yum. The error leading to this problem was: /usr/lib/python2.4/site-packages/rpm/_rpmmodule.so: wrong ELF class: ELFCLASS32 ~~~ OK, so I thought I could fix this by installing the dependency. After digging through a bunch of cascading dependencies using rpm, I got to the elfutils, which didn't want to install until I used the --ignorearch switch on rpm. However, when I try to install the 64-bit version of rpm-libs on top of that, I still get the complaint about the failed dependency on elfutils. My first question is: Would I be better off just wiping the machine and installing from scratch at this point, or is there some sane way to get yum reconstructed? And the second question: did I make a mistake by assuming that the upgrade system would work as it should, or is this just a bug in the upgrade system? And to my first question, does anyone know what else the updater is likely to have broken? Thanks, --Bill

3 6

uuid problem while compiling glue
by Tang Jianwei 14 Aug '10

14 Aug '10

Hi guys I got the errors like this while compiling cluster glue: ./.libs/libplumb.so: undefined reference to `uuid_parse' ./.libs/libplumb.so: undefined reference to `uuid_generate' ./.libs/libplumb.so: undefined reference to `uuid_copy' ./.libs/libplumb.so: undefined reference to `uuid_is_null' ./.libs/libplumb.so: undefined reference to `uuid_unparse' ./.libs/libplumb.so: undefined reference to `uuid_clear' ./.libs/libplumb.so: undefined reference to `uuid_compare' collect2: ld returned 1 exit status gmake[2]: *** [ipctest] Error 1 gmake[2]: Leaving directory `/root/Reusable-Cluster-Components-glue-1.0.5/lib/clplumbing' gmake[1]: *** [all-recursive] Error 1 gmake[1]: Leaving directory `/root/Reusable-Cluster-Components-glue-1.0.5/lib' make: *** [all-recursive] Error 1 and here is the output when I run ./configure: configure: creating ./config.status config.status: creating Makefile config.status: creating config.h config.status: config.h is unchanged config.status: executing depfiles commands cluster-glue configuration: Version = 1.0.6 (Build: 1c87a0c58c59fc384b93ec11476cefdbb6ddc1e1) Features = Prefix = /usr Executables = /usr/sbin Man pages = /usr/man Libraries = /usr/lib Header files = /usr/include Arch-independent files = /usr/share Documentation = /usr/share/doc State information = /usr/var System configuration = /usr/etc Use system LTDL = no HA group name = haclient HA user name = hacluster CFLAGS = -g -O2 -ggdb3 -O0 -fgnu89-inline -fstack-protector-all -Wall -Waggregate-return -Wbad-function-cast -Wcast-qual -Wcast-align -Wdeclaration-after-statement -Wendif-labels -Wfloat-equal -Wformat=2 -Wformat-security -Wformat-nonliteral -Winline -Wmissing-prototypes -Wmissing-declarations -Wmissing-format-attribute -Wnested-externs -Wno-long-long -Wno-strict-aliasing -Wpointer-arith -Wstrict-prototypes -Wwrite-strings -ansi -D_GNU_SOURCE -DANSI_ONLY -Werror Libraries = -lbz2 -lxml2 -lc -lrt -ldl -L/lib -lglib-2.0 Stack Libraries = I found that some one said that maybe I need libuuid-devel. but when I tried to install libuuid-2.17.2-4.el6.i686.rpm and libuuid-devel-2.17.2-4.el6.i686.rpm I still got this: # rpm -ihv libuuid-2.17.2-4.el6.i686.rpm libuuid-devel-2.17.2-4.el6.i686.rpm warning: libuuid-2.17.2-4.el6.i686.rpm: Header V3 RSA/SHA256 signature: NOKEY, key ID f21541eb error: Failed dependencies: rpmlib(FileDigests) <= 4.6.0-1 is needed by libuuid-2.17.2-4.el6.i686 rpmlib(PayloadIsXz) <= 5.2-1 is needed by libuuid-2.17.2-4.el6.i686 rpmlib(FileDigests) <= 4.6.0-1 is needed by libuuid-devel-2.17.2-4.el6.i686 rpmlib(PayloadIsXz) <= 5.2-1 is needed by libuuid-devel-2.17.2-4.el6.i686 what should I do to fix those problems? you will be very appreciated for any suggestion. thank you -- Tang Jianwei

2 4

ATI mobility Radeon HD 5470
by sync 14 Aug '10

14 Aug '10

Hi , guys: I have a new Acer laptop and I have installed CentOS 5.5 x86_64 bit. The problem is that there is no driver for the ATI mobility radeon HD5470 and the graphic is so bad! On amd-ati website I have found the catalyst driver version 10.2 butit seems not to be the correct solution. The current screen resolution is 1024x768, but my laptop is widescreen and the best screen resolution is 1366x768. Do you have any suggestion? Thanks in advance .... [image: Reply With Quote]<http://ubuntuforums.org/newreply.php?do=newreply&p=8970366>

5 9

upgrading storage on hardware RAID 10 possible?
by Rudi Ahlers 13 Aug '10

13 Aug '10

Hi all, Can anyone please tell me, from experience, if it's possible to upgrade the hard drives in a RAID 10 system from 250GB HDD's to 500GB / 750GB HDD's, while the server is running? The server runs CentOS 5.5 x64. Our hardware vendors simply always say no, so we never actually tried doing this, and when a client needed an upgrade like this we had to build a new server with the same spec and larger hard drives and then migrate the data across, which can sometimes take a few days to complete (due to DNS & MAC address caches). So, I'm wondering, is it possible (and safe) to upgrade the existing drives to larger drives in a running server? I know we're done this with Linux's software RAID many times with great success. But I don't want to take a risk if it's not possible. The amount of effort and upfront costs for a new server makes hardware RAID far more expensive than it's reliability, which Linux's software RAID offers equally so I'm beginning to think we should just move all the servers to software RAID in the future as well. -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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CentOS 5.5 latest revisions seem really slow
by Mark 13 Aug '10

13 Aug '10

I recently updated to OpenOffice 3.2 and I noticed that it, and the latest Evolution, seem to be incredibly slow for some operations. E.g., in OO, about half the time when I'm editing something, it takes anywhere from 10-30 seconds for OO to respond to a click on one of the icons or menu items, and Evo is taking forever to format messages. During these times the gnome-system-monitor icon on my panel is showing almost no activity, and if I expand it to the full window, it shows the same. Is anyone else seeing this? I'm running the x86_64 release on an Athlon II X4, 2.6GHz with 4GB of memory and lots of available space in memory and on disk. Thanks in advance. Mark

5 21

preupgrade
by Charles Campbell 13 Aug '10

13 Aug '10

Hello! Just thought I'd present this problem for comment/help/hints: * want to upgrade from Fedora Core 11 to 13 * I have a 64-bit system with Vista as a host o/s, running VMWare, and FC11 as a client o/s * cloned my FC11 as a backup * ran preupgrade, got expected problem with 200MB /boot, but preupgrade said that it could continue downloading (presumably to the larger partition) so I did * preupgrade told me to reboot, so I did * began upgrade process; ran Test. First oddity: Test said it was testing media for FC10 , but test passed. * Problem#1: after test finished, upgrade wanted me to install a disk. There is no such disk -- preupgrade put the upgrade information mostly into /boot, I presume. * had to shutdown the upgrade process * rebooted (I figured I'd try skipping the test this time) * Problem#2: not running upgrade, instead just does a normal boot into FC11 In inspecting /boot, I see a fair amount of upgrade info there. The help for this indicates that I should be using grub to select the upgrade; there is no grub since FC is running as a virtual machine client. At this point I'm considering downloading FC13, writing DVDs, and doing a new virtual client. I was hoping to avoid all that, especially as my FC11 has never recognized the DVD writer drive, so I'll end up having to do it from another machine. Regards, Chip Campbell

4 3

Retrieving POP mail from server to server
by Jussi Hirvi 13 Aug '10

13 Aug '10

I need to transfer a client's email inbox from another mail server to our mail server (Centos 5). This is needed once only (or maybe a couple of times). What is the best command-line tool? Fetchmail? I did this once before, with another tool, but have forgotten. - Jussi -- Jussi Hirvi * Green Spot Topeliuksenkatu 15 C * 00250 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

6 5

DHCP problem with virtual interfaces
by Simone Caldana 13 Aug '10

13 Aug '10

Hello, After asking around in #centos and other linux related IRC channels, here I am, bugging all of you. brace for the long post. (tldr: dhclient loses virtual interface ips) I set up a system to deploy statically assigned IPs to physical and virtual interfaces to a number of (virtual) machines. I have a DHCPD with an entry for each virtual ip in the form of host eth0-1.virt1.test.it { option dhcp-client-identifier "00:50:56:00:84:00-eth0:1"; fixed-address 10.192.52.132; } where 00:50:56:00:84:00 is the physical mac address, but that's irrelevant. on the client machine I got inside sysconfig's system and wrote a custom ifup-local-eth0 that launches one dhclient per virtual interface, like: /sbin/dhclient -1 -q -lf /var/lib/dhclient/dhclient-eth0:1.leases -pf /var/run/dhclient-eth0:1.pid eth0:1 always on the client in dhclient.conf I have entries like: interface "eth0:1" { send dhcp-client-identifier "00:50:56:00:84:00-eth0:1" ; } at service network start everyone is happy, virtual interfaces gets configured and everything works. after a while (hours, days) suddenly _some_ (not alway all of them, sometimes 1 out of 10, sometimes 9 out of 10) of the virtual IPs disappear. in the DHCPD log files I see things like (not the same machine, because on that I didn't have the issue recently): Aug 11 16:39:52 cp1 dhcpd: DHCPREQUEST for 10.192.52.103 from 00:50:56:00:37:00 via eth1 Aug 11 16:39:52 cp1 dhcpd: DHCPACK on 10.192.52.103 to 00:50:56:00:37:00 via eth1 Aug 11 16:39:52 cp1 dhcpd: DHCPREQUEST for 10.192.52.103 from 00:50:56:00:37:00 via eth1: lease 10.192.52.103 unavailable. Aug 11 16:39:52 cp1 dhcpd: DHCPNAK on 10.192.52.103 to 00:50:56:00:37:00 via eth1 Aug 11 16:39:52 cp1 dhcpd: DHCPDISCOVER from 00:50:56:00:37:00 via eth1 Aug 11 16:39:52 cp1 dhcpd: DHCPOFFER on 10.192.52.102 to 00:50:56:00:37:00 via eth1 Aug 11 16:39:52 cp1 dhcpd: DHCPREQUEST for 10.192.52.102 (10.192.50.21) from 00:50:56:00:37:00 via eth1 Aug 11 16:39:52 cp1 dhcpd: DHCPACK on 10.192.52.102 to 00:50:56:00:37:00 via eth1 Aug 11 16:39:52 cp1 dhcpd: DHCPDISCOVER from 00:50:56:00:37:00 via eth1 Aug 11 16:39:52 cp1 dhcpd: DHCPOFFER on 10.192.52.103 to 00:50:56:00:37:00 via eth1 Aug 11 16:39:52 cp1 dhcpd: DHCPREQUEST for 10.192.52.102 (10.192.50.21) from 00:50:56:00:37:00 via eth1: lease 10.192.52.102 unavailable. Aug 11 16:39:52 cp1 dhcpd: DHCPNAK on 10.192.52.102 to 00:50:56:00:37:00 via eth1 Also, in the clients' leases file I find leases for ips that should go to othe dhclients on the same machine. My guesses are either: a) dhclient doesn't always send dhcp-client-identifier and thus the server can't verify the IP they claim is theirs. why this doesn't happens at every renew I don't know (I tried using very short lease times, and wasn't able to reproduce the issue). b) dhclients steals DHCPOFFER replies from each other, leading the stealing DHCP take charge of the stolen from IP and having its original one fade into oblivion. to work around b) I tried to point the N dhclients to the same lease file, but this still lead to NAKs (albeit not lost IPs) _and_ a strangely looking leases file, with empty lines but apparently no significant corruption. software versions: # dhcpd -V Internet Systems Consortium DHCP Server V3.0.5-RedHat # dhclient -V Internet Systems Consortium DHCP Client V3.0.5-RedHat the problem happened also using DHCP Server 3.0.1 on an older CentOS 4.5 I'm looking for ideas to better pinpoint the problem, alternatives, anything. possible FAQs: Q) do you have dynamic ip pools on the DHCP server? A) yes, but not on this subnet. This subnet only has statically assigned ips, both physical (mapped with MAC addresses) and virtual (mapped with dhcp-client-id Q) do you see IPs assigned on the wrong machine? A) never happened. Q) do service network restart fix the issue? A) yes, always, and yes, temporarily. This makes me think the system is basically right and this may be a bug. Q) do you have network issues? A) no, and this doesn't seem to happen in moments where a network related problem may be likely Q) why don't you use sysconfig virtual interfaces configuration files? A) they doesn't support DHCP, only static IPs Q) did you try building a newer dhclient/dhcpd? A) I built 4.2's dhclient from ISC sources but the pair dhclient/dhclient-script isn't a drop in replacement for CentOS. Q) why don't you use static IPs, if they are static in DHCP? A) I want to be able to reconfigure the networks without editing tons of files on tons of machines. I currently have tens of these VMs deployed and the number is likely to increase alot in the future. The deployment and configuration is automatic using a central configuration. Attached a txt with the tcpdump of the above log extraction. Thanks. -- Simone Caldana Senior Consultant Critical Path via Cuniberti 58, 10100 Torino, Italia +39 011 4513811 (Direct) +39 011 4513825 (Fax) simone.caldana(a)criticalpath.net http://www.cp.net/ Critical Path A global leader in digital communications

2 4

tar - ssh - standard out
by Tom Brown 13 Aug '10

13 Aug '10

Hi I have a process that creates 'some data' and outputs this to standard out and i want to shift this data over ssh to a remote box without ever writing anything locally. I have been experimenting with tar to create the archive as the i dont know what the contents of 'some data' might be so i just need to capture it and output it on the other side. I have been trying with $ tar czf - . | ssh -q 192.168.122.2 "tar xzf -" and this works fine to create an archive of this '.' directory and pipe that over to the other side but i want to take standard out so.... $ tar czf - `the thing that generates standard out here` | ssh -q 192.168.122.2 "tar xzf -" Would that work or is there a better way to get this over to the other side? It needs to be a data stream though so things like scp and rsync are no good and i need to know what the command is on the remote side being run so that i can restrict this in the ssh public key on the remote side. thanks

8 11

Problem resizing partition of nfs volume
by Dan Yamins 13 Aug '10

13 Aug '10

Hi: I have an NFS volume that I'm trying to resize a partition on. Something about the fdisk process is corrupting something on the drive Before running fdisk, I can mount the volume find: $ mount /dev/sdo1 /home ... and the volume is mounted fine. And, $ e2fsck -f /dev/sdo1 /dev/sdo1: clean, ... But then I run fdisk to rewrite the partition table of this drive, to expand the /dev/sdo1 partition w/o losing data: $ fdisk /dev/sdo # Type 'd' to delete the primary partition # Type 'n' for new partition # Type 'p' for primary # Type '1' for 1st # Type Enter for 1st cylinder # Type Enter for last cylinder (full disk) # Type 'w' to finish Calling ioctl() ... Syncing disks ... But then something has gone wrong. $ e2fsck -f /dev/sdo1 e2fsck 1.39 (29-May-2006) Couldn't find ext2 superblock, trying backup blocks... e2fsck: Bad magic number in super-block while trying to open /dev/sdm1 ... And I can't mount the volume any more: $ mount /dev/sdo1 /home mount: you must specify the filesystem type What am I doing wrong? Am I missing a step of the process? Thanks! Dan

4 7

Ext3 undelete
by Jason Pyeron 12 Aug '10

12 Aug '10

I was fooled by a hard link trying to clean up disk space. How can I undelete many files? (time is of the essence as I cannot unmount the partition) -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.

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