Discuss December 2009

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295 participants
271 discussions

restoring using rysnc
by robert mena 31 Dec '09

31 Dec '09

Hi, My backup server (B) has a /backup/home and I'd like to restore /backup/home/userX to /home/userX in my server A I am trying to do with in the server where I want to restore. rsync -e ssh -avzp -R --exclude "*.journal" backup_server:/backup/home/userX/ /home/userX But it is creating a /home/userX/backup/home/userX What am I doing wrong?

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DRBD error : Invalid module format
by robert mena 31 Dec '09

31 Dec '09

Hi, I am trying to use drbd in my centos 5.4 but I keep getting errors. When I try modprobe -v drbd I receive insmod /lib/modules/2.6.18-164.el5PAE/extra/drbd/drbd.ko FATAL: Error inserting drbd (/lib/modules/2.6.18-164.el5PAE/extra/drbd/drbd.ko): Invalid module format. The current (running) kernel is 2.6.18-164.el5PAE kmod-drbd-8.0.16-5.el5_3 drbd-8.0.16-5.el5.centos Any tips?

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[OT] CAT5 IP-capable rackmount KVM units?
by Thomas Harold 31 Dec '09

31 Dec '09

Rather off-topic, but I'm looking for IP-based KVMs (~16 ports) that can handle both PS/2 and USB hookups on the server side. All of the answers over at Slashdot are a few years out of date and it looks like prices on KVM head units have dropped a bit over the years. Some of the older units only worked with Windows, Internet Explorer and ActiveX. Others like the ATEN KH1516i supposedly use Java and are far better from a cross-platform point of view. I'm on the fence about the CAT5 cables over the more traditional style, it seems like the CAT5 cable system would give a lot more flexibility in dealing with USB vs PS/2 servers (or even serial only?). The bigger advantage with the CAT5 stuff seems to be fewer length limitations and less space used in the rack for the head unit. I'm guessing that the CAT5 adapters are going to be proprietary?

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Find reason for heavy load
by Noob Centos Admin 31 Dec '09

31 Dec '09

My Centos 5 server has seen the average load jumped through the roof recently despite having no major additional clients placed on it. Previously, I was looking at an average of less than 0.6 load, I had a monitoring script that sends an email warning me if the current load stayed above 0.6 for more than 2 minutes. This script used to trigger perhaps once an hour during peak periods. Even so, I seldom see numbers higher than 1.x On 4th Dec, somebody from an Indian IP range started hammering my SMTP service, attempting to use it as an open relay. Naturally that didn't work and only end up budging my typical 400KB daily log report into 2MB~4MB affairs. After observing a few days to determine the IP range, I started blocking the Indian subnet with apf. Initially I had problems with getting apf to wok properly but after a couple of days managed to get the block working and my daily log went back down to expected size when all those connection attempts disappear from exim's log. Now this is when my server load started to shoot through the roof with figures like 8.64 5.90 3.62 being reported by my monitoring script, triggering so often. I had to raise my threshold to 1.6 to keep my own script from spamming myself. I've tried changing several things on the server, since initially it seems like the high load may be due to I/O wait. So I turning off non-essential services like OpenNMS to see if that had any effect. I also turned off apf and inserted rules manually into iptables to reduce the number of iptable rules the system has to process. All that doesn't seem to help much, I'm still getting consistent server loads in the 2.x to 3.x range almost all the time. The problem is using top, none of my processes are showing abnormal CPU%, most are well under 5%, manually adding them up doesn't equate the 200% to 300% the load figures of 2.x and 3.x are indicating. Even top's own summary says CPU % is in the 20~30% range, what's worrying is the System% is also in the same range. I have no idea what is "system" doing since it appears that anything running inside the kernel is lumped under "system". Or why even totalling both % up, I would expect 50~60% to translate to the expected load of 0.5~0.6 yet system load stats is 5x what's expected. I've installed utilities like dstat to try to see if I can figure out which process is making the system calls that is clogging up the server but either I don't understand it or it's not the right tool. So I'll appreciate some advice on how/what should I do next to identify the cause. Thanks in advance!

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Aide questions
by Steve Campbell 31 Dec '09

31 Dec '09

I've got aide aide-0.13.1-4.el5 running on a server, and aide aide-0.13.1-2.0.4.el5 running on a similar server. There appears to have been a change in the way base directories are being monitored in the two versions. Both servers are running logical volumes, but it seems to not matter as I'm running aide on a server without logical volumes and the problem still shows up. Now the problem.... On the server with the newer aide, it reports MTime and CTime changes in some of the base directories such as: Directory: /root Mtime : 2009-12-18 09:14:02 , 2009-12-24 12:20:53 Ctime : 2009-12-18 09:14:02 , 2009-12-24 12:20:53 Directory: /usr/bin Mtime : 2009-12-18 00:04:20 , 2009-12-31 00:05:08 Ctime : 2009-12-18 00:04:20 , 2009-12-31 00:05:08 The older version of aide doesn't do this. Both aide.conf files are identical. I've tried entries in the conf file like the following to avoid this, but it seems I shouldn't have to do this: /usr/bin$ DIR where I've redefined DIR to not include "m" and "c". I still get reports of files below /usr/bin, but this avoids the changes to the directory itself everyday. Does anyone have a clue how to avoid this any other way, and maybe if aide is doing this differently now (and why)? It's not a big deal, but I'm kinda believing I'm not doing it the right way. Thanks steve campbell

1 0

VirtualBox and CentOS
by Lars Hecking 31 Dec '09

31 Dec '09

I recently doownloaded and installed the latest RHEL5 rpm from the VirtualBox web site. While it generally works very well, I have been unable to get USB access to work on the guest. This seems to be a very common problem. Many references to it turn up in a web search, but I have not found a solution that works on CentOS 5. I got no response on the vbox-users mailing list either. Can anyone here help? Among the things I tried were various /sys and /proc/bus/usb related fstab and rc.sysinit changes. Drew a total blank on this one ...

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upgrade adivce
by William Warren 31 Dec '09

31 Dec '09

I have a new client that is running a fedora 4 system. Can i upgrade that box to centos 5 with a reasonable expectation of success or should i just back it up and do it from scratch? Also will the samba version in centos 5 natively support windows 7 clients? Links to tips and tricks are appreciated..:) Sincerely, William Warren

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Community in each Country
by Fitrah Elly Firdaus 31 Dec '09

31 Dec '09

Dear All, whether there are members here who are active in the community board CentOS in your respective countries? I want to make Centos community in my country,Indonesia. I expect support from all friends Regards Firdaus

2 1

autofs problems
by Mag Gam 30 Dec '09

30 Dec '09

We have about 800 CentOS 5.2 servers and our university. We use NFS being served from over 10 NetApp frames. We use autofs for to mount up our partitions. There have been times where we can't cd into the directory. It says the directory does not exist. On some servers it works but on others it does not. Typically we restart amd and autofs to resolve this issue. But sometimes it does not even work. A reboot fixes the problem. I am wondering if anyone knows any tricks to check if autofs is working properly on the system and also what I should do in a situation like this. TIA

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OT: What are the 2 openssl commands I need to use?
by Lanny Marcus 30 Dec '09

30 Dec '09

I looked on the openssl man page but am too dense with commands to understand what I need to do..... Ran into problems generating a key and CSR for SSL, because the web site is on a server with an old Ensim Control Panel. Please someone knowledgeable, give me the openssl commands I need to use, after I ssh into the web site, to generate a 2048 bit key and csr. TIA and Happy New Year! "I believe the issue you are having is due to the size of the encryption key. The ensim control panel generates a 1024 bit key, where the certificate you got was 2048 bits. What you need to do is generate a 2048 bit key and csr on your domain. You would need to login in to your domain through ssh and generate the files from the command line." Lanny -------------------------------------- Magazine subscriptions Largest discount Credit/Debit Card Check Pay Pal http://lowcostmagazines.com/

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Discuss December 2009