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Lost root access
by James Bensley 04 Feb '11

04 Feb '11

So on a virtual server the root password was no longer working (as in I couldn't ssh in anymore). Only I and one other know it and neither of us have changed it. No other account had the correct privileges to correct this so I'm wondering, if I had mounted that vdi as a secondary device on another VM, browsed the file system and delete /etc/shadow would this have wiped all users passwords meaning I could regain access again? (This is past tense because its sorted now but I'm curious if this would have worked? And if not, what could I have done?). -- Regards, James. http://www.jamesbensley.co.cc/ There are 10 kinds of people in the world; Those who understand Vigesimal, and J others...?

10 17

CentOS 4.8
by Y. K. Liu 03 Feb '11

03 Feb '11

Hi, I installed CentOS 4.8 (not CentOS 5) on VMware Fusion using an ISO file I downloaded. During the installation, it asked me to enter a user name and its password. I tried to enter root for the user name, but it would not let me do that. So I had to enter a non-root user name. So I did not have the root user name and password when the installation completed. I only had a non-privileged user name, and could not do any sudo work. How can I solve this problem? I noticed that CentOS 5 (not the 4.8 I needed to install) asking to enter the password for root during the installation. But I need to install CentOS 4.8, not 5. Thank you. Jerry

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centos 5.5 check memoray usage too high???
by mcclnx mcc 03 Feb '11

03 Feb '11

We have DELL R900 server with 128GB RAM (CENTOS 5.5)in it. This server only have one application running and few people use it. Every week I ata least get one or two messages from monitor tool mail to me say: Message=Memory Utilization is 92.02%, crossed warning (80) or critical (90) threshold. Since server have 128 GB RAM and only 1 application. I really don't belive that. Does there has some way can check memory utilitation ? Thanks.

11 13

How to set GNOME-panel to several columns if needed?
by kellyremo 03 Feb '11

03 Feb '11

http://i.imgur.com/rUKeu.png how could i configure the GNOME-panel to have several columns [if there are many applications]? ~~like this: http://i.imgur.com/ElgAA.jpg Thank you!

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Re: [CentOS] CentOS Digest, Vol 73, Issue 3
by Chuck Munro 03 Feb '11

03 Feb '11

On 02/03/2011 09:00 AM, Lamar Owen wrote: > ------------------------------ > > On Wednesday, February 02, 2011 08:04:43 pm Les Mikesell wrote: >> > I think there are ways that drives can fail that would make them not be detected >> > at all - and for an autodetected raid member in a system that has been rebooted, >> > not leave much evidence of where it was when it worked. If your slots are all >> > full you may still be able to figure it out but it might be a good idea to save >> > a copy of the listing when you know everything is working. > I'll echo this advice. > > I guess I'm spoiled to my EMC arrays, which light a yellow LED on the DAE and on the individual drive, as well as telling you which backend bus, which enclosure, and which drive in that enclosure. And the EMC-custom firmware is paranoid about errors. > > But my personal box is a used SuperMicro dual Xeon I got at the depth of the recession in December 2009, and paid a song and half a dance for it. It had the six bay hotswap SCSI, and I replaced it with the six bay hotswap SATA, put in a used (and cheap) 3Ware 9500S controller, and have a RAID5 of four 250GB drives for the boot and root volumes, and an MD RAID1 pair of 750GB drives for /home. The Supermicro motherboard didn't have SATA ports, but I got a 64-bit PCI-X dual internal SATA/dual eSATA low-profile board with the low-profile bracket to fit the 2U case. Total cost<$500. > Less than $500 for a Supermicro box? Holy crap, Batman! I'm using one of their motherboards (X8DAL-3) in a home-brew configuration, which has turned out to be somewhat less expensive than a factory-built Supermicro, but still not cheap. I'll say one thing for them ... they do make really nice stuff, with little extras the commodity makers like Asus or Gigabit don't include. Well worth the extra dollars. This box just screams, so it should handle KVM very nicely if I organize the arrays properly ... anyone with RAID-60 advice please chime in. I took Les' advice and built a connection map of the 15 drives. The Disk Utility GUI turned out to be useful once I determined the SATA breakout cable order and labelled each with its PHY number. Knowing that lets me use the GUI to clearly identify a failed drive, which shows up as a PHY#. I'm normally a command-line kinda guy but this utility is something I really like on RHEL-6. I hope it's the same on CentOS-6. I'll organize the disk arrays with this trial version of RHEL, on the assumption that CentOS-6 simply picks them up as-built. Chuck

6 7

No kernel-debuginfo for actual kernel?
by Gerhard Schneider 03 Feb '11

03 Feb '11

After a crash I tried wget http://debuginfo.centos.org/5/x86_64/kernel-debuginfo-2.6.18-194.32.1.el5.x… as usual. But for 32.1 there is no kernel-debuginfo. Is there any reason for that? Thank you in advance! Gerhard Schneider -- Gerhard Schneider e-Mail:gs@ilsb.tuwien.ac.at Institute of Lightweight Design and Tel.: +43 664 60 588 3171 Structural Biomechanics (E317) Fax.: +43 1 58801 31799 Vienna University of Technology / Austria DVR: 0005886 A-1040 Wien, Gusshausstrasse 27-29 http://www.ilsb.tuwien.ac.at/

2 2

hp laptop
by Jerry Geis 03 Feb '11

03 Feb '11

I have a new hp laptop, I installed centos 5.5 on x86_64. I was only seeing one core in /proc/cpuinfo. The CPU is core i5 M450 which should be dual core. So I put a more recent kernel on the machine, 2.6.34.7 did the compile and all - rebooted and I still only see one core in /proc/cpuinfo. the i5 M450 is a dual core cpu. Is there something else I am missing? Thanks, Jerry

2 1

OT: looking for system Rescue CD with LSI MegaRAID 8708EM2 drivers pre-installed
by Rudi Ahlers 03 Feb '11

03 Feb '11

Hi all, Does anyone know of a Linux rescue CD with driver for a SLI MegaRAID 8708? -- 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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Re: [CentOS] RHEL-6 vs. CentOS-5.5 (was: Static assignment of SCSI device names?)
by Chuck Munro 03 Feb '11

03 Feb '11

On 02/02/2011 09:00 AM, Lamar Owen wrote: > > On Wednesday, February 02, 2011 02:06:15 am Chuck Munro wrote: >> > The real key is to carefully label each SATA cable and its associated >> > drive. Then the little mapping script can be used to identify the >> > faulty drive which mdadm reports by its device name. It just occurred >> > to me that whenever mdadm sends an email report, it can also run a >> > script which groks out the path info and puts it in the email message. >> > Problem solved:-) > Ok, perhaps I'm dense, but, if this is not a hot-swap bay you're talking about, wouldn't it be easier to have the drive's serial number (or other identifier found on the label) pulled into the e-mail, and compare with the label physically found on the drive, since you're going to have to open the case anyway? Using something like: > > hdparm -I $DEVICE | grep Serial.Number > > works here (the regexp Serial.Number matches the string "Serial Number" without requiring the double quotes....). Use whatever $DEVICE you need to use, as long as it's on a controller compatible with hdparm usage. > > I have seen cases with a different Linux distribution where the actual module load order was nondeterministic (modules loaded in parallel); while upstream and the CentOS rebuild try to make things more deterministic, wouldn't it be safer to get a really unique, externally visible identifier from the drive? If the drive has failed to the degree that it won't respond to the query, then query all the good drives in the array for their serial numbers, and use a process of elimination. This, IMO, is more robust than relying on the drive detect order to remain deterministic. > > If in a hotswap or coldswap bay, do some data access to the array, and see which LED's don't blink; that should correspond to the failed drive. If the bay has secondary LED's, you might be able to blink those, too. > > Well no, you're not being dense. It's a case of making the best of what the physical hardware can do for me. In my case, the drives are segregated into several 3-drive bays which are bolted into the case individually, so removing each one to compare serial numbers would be a major pain, since I'd have to unbolt a bay and remove each drive one at a time to read the label. The use of the new RHEL-6/CentOS-6 'udevadm' command nicely maps out the hardware path no matter the order the drives are detected/named, and since hardware paths are fixed, I just have to attach a little tag to each SATA cable with that path number on it. One thing I did was reboot the machine *many* times to make sure the controller cards were always enumerated by Linux in the same slot order. I also notice that the RHEL-6 DriveInfo GUI application shows which drive is giving trouble, but it only maps the controllers in a vague way with respect to the hardware path. (At least that's what I remember seeing a couple of days ago, I could be mistaken.) On this particular machine I don't have the luxury of per-drive LED activity indicators, so whacking each drive with a big read won't point the way (but I have used that technique on other machines). I didn't have the funds to buy the hot-swap bays I would have preferred. I may retrofit later. Your suggestions are well taken, but the hardware I have doesn't readily allow my use of them. Thanks for the ideas. Chuck

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[OT] Best way to get dhcpd messages piped to a web service.
by Jason Pyeron 03 Feb '11

03 Feb '11

Starting off, it is important not to loose any dhcp messages, especially during log rotation. My first thought on this would be to add a fifo to syslog.conf and slup from it, like: # perl -ne 'm/.../ && WWW::Curl ...' < /var/log/messages.fifo Does anyone see a more proper way? tail -F / -f could both miss messages during log rotation (please correct me if I am wrong) What are some of the problems that could be manifested in syslog if the fifo consumer stops consuming or has other issues? -Jason -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - 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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