Discuss May 2008

discuss@lists.centos.org

268 participants
281 discussions

smp falls back to up mode on quad core
by Julian Echave 28 May '08

28 May '08

Hi, I'm running Centos 5.1 on an Intel Quad 2 Core with four Q6600 processors. Despite Centos 5 supporting multiple cores (SPM), it doesn't seem to work for me: 1) a dmesg shows that only one processor is seen: "SPM alternatives: switching to UP code", etc. 2) file /proc/cpuinfo shows only one processor 3) top with option 1 (to toggle between seeing all processors or an average) shows only 1 processor. I've googled this, and other people have found this kind of trouble, but I was not able to find any solutions. By the way: I've installed windows xp to see if it was a bios problem, but windows sees the 4 processors just fine. Any ideas? Thanks, Julian.

4 8

get widescreen 1280x800 for intel 965GM chipset
by Chen Xu 28 May '08

28 May '08

Dear All, I come from FreeBSD world. This is my first time setting up a CentOS on my laptop Dell Vostro 1400 with intel 965GM chipset. I am having problem here and need your help. I have 5.1 release installed. I have trouble to get 1280x800 resolution. The driver used is I810. I don't know if the chipset is too new for the xorg driver, and can anyone tell me if there is a fix, maybe with 915resolution? Any information is helpful. Thanks here in advance. -Chen

3 2

Secure iptables settings
by Joseph L. Casale 28 May '08

28 May '08

Is it feasible to write protect the /etc/sysconfig/iptables file so nothing can overwrite it, such that at least the config is persistent through a reboot? If not, is there a better way to accomplish this? Thanks! jlc

3 3

CPU temperature in an PowerEdge 860, LM85 chip
by Santi Saez 28 May '08

28 May '08

Dear Srs, I'm trying to monitor CPU temperatures in a PowerEdge 860 server, running CentOS 5.1 with 2.6.18-53.1.6.el5 kernel, using lm-sensors v2.10.0. Running "sensors-detect" I get: ====================================================================== (..) We can start with probing for (PCI) I2C or SMBus adapters. You do not need any special privileges for this. Do you want to probe now? (YES/no): Probing for PCI bus adapters... Use driver `i2c-i801' for device 00:1f.3: Intel ICH7 Probe succesfully concluded. We will now try to load each adapter module in turn. Load `i2c-i801' (say NO if built into your kernel)? (YES/no): Module loaded succesfully. (..) (..) Next adapter: SMBus I801 adapter at 08c0 Do you want to scan it? (YES/no/selectively): Client found at address 0x08 Client found at address 0x2e (..) (..) Probing for `National Semiconductor LM85 or LM96000'... Success! (confidence 7, driver `lm85') (..) (..) Client found at address 0x50 Probing for `SPD EEPROM'... Success! (confidence 8, driver `eeprom') Probing for `DDC monitor'... Failed! Probing for `Maxim MAX6900'... Failed! Client found at address 0x52 Probing for `SPD EEPROM'... Success! (confidence 8, driver `eeprom') Client found at address 0x60 Client found at address 0x69 (..) ====================================================================== This is the result of running "lm-sensors": ====================================================================== Driver `lm85' (should be inserted): Detects correctly: * Bus `SMBus I801 adapter at 08c0' Busdriver `i2c-i801', I2C address 0x2e Chip `National Semiconductor LM85 or LM96000' (confidence: 7) Driver `eeprom' (should be inserted): Detects correctly: * Bus `SMBus I801 adapter at 08c0' Busdriver `i2c-i801', I2C address 0x50 Chip `SPD EEPROM' (confidence: 8) * Bus `SMBus I801 adapter at 08c0' Busdriver `i2c-i801', I2C address 0x52 Chip `SPD EEPROM' (confidence: 8) ====================================================================== So, lm85 chip is correctly detected. Running "sensors" I get this output: ====================================================================== # sensors lm85-i2c-0-2e Adapter: SMBus I801 adapter at 08c0 V1.5: +0.00 V (min = +1.42 V, max = +1.58 V) VCore: +0.00 V (min = +1.03 V, max = +1.14 V) V3.3: +0.00 V (min = +3.13 V, max = +3.47 V) V5: +0.00 V (min = +4.74 V, max = +5.26 V) V12: +0.00 V (min = +11.38 V, max = +12.62 V) CPU_Fan: 0 RPM (min = 4000 RPM) ALARM fan2: 0 RPM (min = 0 RPM) ALARM fan3: 0 RPM (min = 0 RPM) ALARM fan4: 0 RPM (min = 0 RPM) ALARM CPU: +0Â°C (low = +10Â°C, high = +50Â°C) Board: +0Â°C (low = +10Â°C, high = +35Â°C) Remote: +0Â°C (low = +10Â°C, high = +35Â°C) CPU_PWM: 255 Fan2_PWM: 255 Fan3_PWM: 255 vid: +1.088 V (VRM Version 10.0) ====================================================================== Extraneous output, all temperature values returned are +0ºC, it's possible to monitor this motherboard sensors using lm-sensors? Also I have tried to monitor PowerEdge 860 using OpenIPMI, but I get: ====================================================================== # ipmitool sdr elist | grep -i temp Temp | 01h | ns | 3.1 | Disabled Planar Temp | 04h | ok | 7.1 | 28 degrees C Temp Interface | 53h | ns | 7.1 | Disabled ====================================================================== What means "Planar Temp"? And why "Temp" and "Temp Interface" params are disabled? Can I get CPU temperature with using IMPI? If I can't get temperatures using lm-sensors or OpenIPMI, what utility is available for Linux? thanks!! Regards, -- Santi Saez

1 0

Alberto Varesio is out of the office.
by A.Varesio＠spaziosystem.com 28 May '08

28 May '08

I will be out of the office starting 05/28/2008 and will not return until 05/29/2008. prova

1 0

simple load balancing/failover for OWA
by Ruslan Sivak 28 May '08

28 May '08

We are building an exchange cluster with two front end Outlook Web Access servers. We would like to at least have some sort of failover, and prefereably load balancing for them. The MS recommended way is to use NLB, but for various reasons that's not working with our set up. We are looking to set up a single linux server and use something like LVS to load balance/fail over the connections. Looking at LVS, it looks like it hasn't been updated in a while. Is it stable? Is it still the preferred solution? Since OWA has sessions, but no session replication, we would need something that can keep directing the same client to the same server (either by IP, or preferably by cookie). Can LVS handle this? I also saw that the latest version of Apache has some sort of load balancing support. Can it be used to set something like this up? We are looking for the simplest solution that won't require a lot of maintanence. We understand that having a single LVS box creates a single point of failure, and are willing to accept the risk for now to keep things simpler. Russ

4 5

memorial day kernel panic
by sbeam 28 May '08

28 May '08

I have a simple Tyan server with RAID1 on a 3ware 7002 that has been running updated Centos 5.1 for almost 3 weeks with no problem, it runs low-traffic Apache/PHP/mySQL and vsftpd sites exclusively - last night it crashed. The console showed something about a process named 'php' and gave a process id with the panic message, but that's all I can remember. Hard-rebooted and all was well... Then about 55 minutes later I was logged in with ssh and it froze. Another fun holiday trip back to the datacenter. This time I brought a camera, but found a message totally different - this seems more like a ext3/disk problem? http://www.flickr.com/photos/sbeam/2525251590/sizes/l/ the logs contain nothing unusual. I have set up a script to do a vmstat/ps dump every 10 minutes. Anything else advised by this kernel dump or places to look? Thanks much- Sam

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USB modem on centos
by Jerry Geis 28 May '08

28 May '08

I am playing with a USR (us robotics) USB modem model 5637. in the past I used internal modems and had no issues. One this unit I plugged it in, dmesg says its recogized. I did "ln -s /dev/ttyACM0 /dev/ttyS4" this works. I then did "cu -l /dev/ttyS4" type "AT" and I get OK... looking good. When I "ATDT my number" I get a connection at 1200 baud (which I should) and funny characters... I thought looks like a parity thing. I then did "cu -e -l /dev/ttyS4" type "AT" and I get OK... Now when I do "ATDT my number" I get a connection at 1200 baud and I get readable characters. In the past internal PCI modems I never had to do anything special, just the cu -l /dev/ttyS4. I thought modem to modem handled all that speed/parity stuff and computer to modem just always worked given the correct baud rate. Does anyone know what the issue might be here. The reason I am asking is my program that talks to the modems (computer to modem) has always been setup for 8 data no parity and has always worked. When I use my program on the USB modem it is not working and I assumed from the parity issue above using "cu" to demonstrate. When I change my program to be 7 data bits and even parity it still did not work. Was wondering if anyone had any USB modem experience on centos and might know what is going on? Thanks, Jerry

2 1

why there is no liblua5.1.so in /usr/lib?
by bqj123 28 May '08

28 May '08

hello all: I want to install ModSecurity v2.5.4 in my system. I do the following setup to install the lua tar -xzvf lua-5.1.3.tar.gz cd lua-5.1.3/src make linux cd .. make install The ModSecurity ask me to add "LoadFile /usr/lib/liblua5.1.so" to the http.conf,but there is no liblua5.1.so in /usr/lib. I have search it and i didn't find the solution. Can any one tell me why there is no liblua5.1.so in /usr/lib Thanks for any reply.

4 4

clustered mail server?
by Rudi Ahlers 28 May '08

28 May '08

Hi all I'm looking for a working HOWTO / Tutorial / sample setup of setting up a clustered email server. I know I can setup a CentOS cluster with Heartbeat & drbd, but I'm not 100% convinced it will work for the email as well. Ideally, I'd like to use an open source groupware server, like say open exchange, php groupware, Scalix (free / community version), etc. So, if anyone can please point me in the right direction? I've already setup a heartbeat cluster, and use rsync to sync files for Samba, Apache & NFS, and also setup a Master-Master MySQL replication, but don't yet know how to setup the email server, -- Kind Regards Rudi Ahlers CEO, SoftDux Web: http://www.SoftDux.com Check out my technical blog, http://blog.softdux.com for Linux or other technical stuff, or visit http://www.WebHostingTalk.co.za for Web Hosting stuff

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Discuss May 2008