Discuss March 2011

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Centos v3.3 CD 2
by Luis-Miguel Astudillo 15 Nov '11

15 Nov '11

Sorry, I have been away for a while. has anyone fixed CD2 fotr CentOS v3.3 ? -- Luis

6 7

Scientific Linux 6.0 released (based on RHEL 6.0)
by Arun Khan 02 Sep '11

02 Sep '11

I know this is the CentOS list. However, as there has been some interest in CentOS 6.0 (RHEL 6), I thought I'd share the news here. Scientific Linux 6 is based on RHEL 6 with add-ons for scientific computing. FWIW, the Admin tools etc. are pretty much the same as in RHEL, so are the base packages. Read more at <http://www.scientificlinux.org/distributions/6x/60/> -- Arun Khan

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Redirecting PHP error messages into a log file
by Alexander Farber 30 Jun '11

30 Jun '11

Hello, I'm using CentOS release 5.5 x86_64 with the stock php-5.1.6-27.el5 and would like to redirect PHP messages into /var/log/httpd/php_log First I tried adding that file name to /etc/php.ini: error_log = "/var/log/httpd/php_log" and restarted httpd, but the file didn't appear. I've touched it and changed owner to apache.apache, but that didn't help. Then I've changed that line to error_log = syslog and now I get the messages in /var/log/messages: Jul 29 21:29:24 hXXX httpd: PHP Notice: Undefined index: REMOTE_ADDR in /var/www/html/odnoklassniki/index.php on line 44 Jul 29 21:29:45 hXXX httpd: PHP Parse error: syntax error, unexpected '[' in /var/www/html/odnoklassniki/index.php on line 44 I still would like to move those message to a separate file though, so I've added the following line to /etc/syslog.conf and reloaded syslogd service: httpd.* /var/log/httpd/php_log but the file is still empty. Any hints please? Thank you Alex -- http://preferans.de

6 6

Lingering dhclient issue
by Alfred von Campe 23 Jun '11

23 Jun '11

I recently reconfigured some CentOS 4.3 systems that were using DHCP to use static IP addresses. At the same time, the systems were moved to a new VLAN. Here is the approximate sequence of events that took place: 1. ifdown eth0 2. edit /etc/sysconfig/network-scripts/ifcfg-eth0 with static IP address 3. wait for network folks to reconfigure switch 4. ifup eth0 I may have reversed steps 1 and 2 on some of the systems. The problem was that the dhclient process didn't go away, and kept renewing the old lease. Our DHCP server is configured to contact the DNS server and update the entry for each host it serves. So the DNS entries for these systems were pointing to the old address in the old VLAN. The eth0 interface itself just kept the static IP address for which it was configured. It took me a while to figure out what was going on. My question is, what could I have done to avoid this (other than killing the dhclient process)? Is there a better way to reconfigure an interface to use a static address? I am not interested in solutions that involve using a GUI (i.e., only command line solutions). Thanks, Alfred

9 17

Re: [CentOS] Issue with Perl and rpmforge - advice? - SOLVED
by Mark 13 Jun '11

13 Jun '11

On Wed, Sep 1, 2010 at 6:51 PM, Mark <mhullrich(a)gmail.com> wrote: > I have an old version of rkhunter installed on my CentOS 5 machine, > one I got from rpmforge. > > In my most recent attempts to update this, I get the following errors in yum: > : > --> Finished Dependency Resolution > perl-AnyEvent-5.240-1.el5.rf.noarch from rpmforge has depsolving problems > --> Missing Dependency: perl(Net::SSLeay) >= 1.33 is needed by > package perl-AnyEvent-5.240-1.el5.rf.noarch (rpmforge) > Error: Missing Dependency: perl(Net::SSLeay) >= 1.33 is needed by > package perl-AnyEvent-5.240-1.el5.rf.noarch (rpmforge) The solution (from the rpmforge users list) was to exclude perl-AnyEvent. Just thought you should know.... Mark

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Migrating standalone systems to KVM
by Jussi Hirvi 24 Apr '11

24 Apr '11

A while ago I got great instructions from Pasi for migrating standalone systems to *xen*. However, now I have decided to use KVM instead, which raises a new question: How to migrate a standalone system to *KVM*? I know a two-step way to do it: standalone system -> xen pv guest xen pv guest -> KVM pv guest I read that xen -> KVM migration is trivially easy. But is there an easier (one-step) way to do this? - 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

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Cant find out MCE reason (CPU 35 BANK 8)
by Vladimir Budnev 20 Apr '11

20 Apr '11

Hello community. We are running, Centos 4.8 on SuperMicro SYS-6026T-3RF with 2xIntel Xeon E5630 and 8xKingston KVR1333D3D4R9S/4G For some time we have lots of MCE in mcelog and we cant find out the reason. "Ordinary" mce message looks like: CPU 51 BANK 8 TSC 8511e3ca77dc MISC 274d587f00006141 ADDR 807044840 STATUS cc0055000001009f MCGSTATUS 0 decode with mcelog --ascii --cpu p4(cause there is no xeon56xx in list): HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor CPU 53 BANK 8 TSC 1982d8f72b1f MISC e1742eac00006242 ADDR 7ffd78a80 MCG status: MCi status: Error overflow MCi_MISC register valid MCi_ADDR register valid MCA: MEMORY CONTROLLER RD_CHANNELunspecified_ERR Transaction: Memory read error STATUS cc0002000001009f MCGSTATUS 0 The global question is it possible to find out the exact hw which causes those messages? First we thought that according to /* A machine check record */ struct mce { __u64 status; /* bank status register */ __u64 misc; /* misc register (always 0 right now) */ __u64 addr; /* address or 0 */ __u64 mcgstatus; /* global MC status register */ __u64 rip; /* Program counter or 0 for silent error */ __u64 tsc; /* cpu time stamp counter */ __u64 res1; /* for future extension */ __u64 res2; /* dito. */ __u8 cs; /* code segment */ __u8 bank; /* machine check bank */ __u8 cpu; /* cpu that raised the error */ __u8 finished; /* entry is valid */ __u32 pad; }; cpu is the cpu rised the exception, but we have 2 quadro cpus with HT so maximum cpu number should be 16 and in logs we see 53 etc. So no we r not sure about what cpu value is :)Does anyone know what the CPU number means exactly? One more interesting thins is the following output: [root@zuno]# cat /var/log/mcelog |grep CPU|sort|awk '{print $2}'|uniq 32 33 34 35 50 51 52 53 Those numbers are always the same. Ok.Supposed we have problem in RAM, since i dont really know what those cpu numbers mean we suppose that cpu+bank can point the problem hw.Is it possible? According to our "broken ram theory" we suppose that those numbers 32,33,34,45 and 50,51,52,53 indicate some simetric problem with ram/or slots or smth else.Is it correct? Thanks in advance.

5 19

Intel DH67BL + CentOS 5.5 IRQ #177 nobody cared
by Drew Weaver 19 Apr '11

19 Apr '11

Hello, We have built a couple of CentOS 5.5 systems on the Intel DH67BL (Sandy Bridge) motherboard and overall they work pretty well. I'm having one problem which keeps cropping up and that is an error message that says: IRQ 177 nobody cared (try booting with the irqpoll option) report bad irq, references CPU idle then it references usb_hcd_irq and e1000_intr then it disables the add-on PCI E1000 card and disconnects itself from the network. I'm assuming what is happening here is the USB controller and the add-on E1000 controller we put in are having an old school IRQ conflict, the question is why and how can I avoid it? I have tried disabling all of the extra stuff in the BIOS that I could, and this still happens fairly frequently. Any advice would be great. thanks, -Drew

9 24

ksplice within CentOS
by Marian Marinov 17 Apr '11

17 Apr '11

Hello guys, I saw that a few days back there was a talk about encorporating the ksplice toolchain into CentOS and creating rebootless upgrades to the CentOS kernel. I'm really interested in helping for that. Where/how we can start work ? Best regards, Marian Marinov

3 2

To PAE or not to PAE...
by John Doe 16 Apr '11

16 Apr '11

Hi, I was wondering if anyone would know the cons of running a PAE kernel...? I have a 4GB pc and was wondering if it was worth going the PAE way to gain those exta 700MB... In the past, I heard that these 700MB were normally reserved for bios or chipset stuff... And that running in PAE would slow down some processes. By the way, I know 64 bits would solve this dilemn but right now I am 32bits... Thx, JD

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Discuss March 2011