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xen vs kvm for virtualization on centos/rhel?
by Robert P. J. Day 12 Aug '10

12 Aug '10

as i'm reviewing the courseware for the rhel (centos) course i'm teaching next week, i'm going to ask the occasional question, possibly technical, possibly more policy. first one involves the choice for virtualization. the course has a short section involving virt using xen but everything i've read suggests that red hat is concentrating on kvm for virt. thoughts on that? i have the freedom to replace the xen section with one covering kvm instead. 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 ========================================================================

10 16

NTFS is more resilient than ext3? Or is it hardware issue?
by Fajar Priyanto 12 Aug '10

12 Aug '10

Hi guys, I don't mean to incite debate or something, just want to share experience and a little curiosity. Back long time ago, we have an old file MS W2K (NTFS) server where due no admin was available to manage it, the server would get power off when the office closed, and auto power on again in the morning. That thing happened for years and it was fine ^^ Recently, I setup a Centos 5.5 file server with ext3 and got power blackout twice and I notice the filesystem got corrupted and also bad sectors. Is it just pure random luck, software or hardware issue? What's your experience? Thank you.

8 7

problems with yum_priorities on CentOS5/RHEL5
by Nick 12 Aug '10

12 Aug '10

Hello, Many of you will have read this page, with its (somewhat ambiguous) endorsement of yum_priorities: http://wiki.centos.org/AdditionalResources/Repositories/RPMForge As I gather has been stated before on the centos list [1], that quote stops short of outlining what exactly is wrong with yum_priorities (YP) and why it's the best solution. In fact it goes on to say: > as of yet, no real world problems have been reported with regard to the > 'yum-priorities' plugin Some (I hope, constructive) comments which might help users of yum/YP to avoid surprises: - The above statement should be altered, since it obviously isn't true (Judging both from comments in [1] and my own experience in [2]) - Perhaps it could explain how YP works and when it doesn't with an example? (I have one you are welcome to copy in [2].) - Could the above page incorporate, or at least link to the useful information at the bottom of the page here: http://wiki.centos.org/PackageManagement/Yum/Priorities - Could it also mention somewhere quite visible that yum_priorities is not available on RHEL5 so any solutions using YP it will just not work there? I'd also like to know more about why YP cannot be made available on RHEL, but I guess this is not the place to ask. Plus I've noticed a couple of features of yum + YP which aggravate the shortcomings - again this is probably not the place, but I'll mention them anyway, as a heads-up to other users. 1. yum check-updates and yum update do *not* warn you of an impending unresolved dependency caused by YP hiding the required package. It seems the only way to find out is if you go ahead and try and perform the update, which potentially leaves you with one or more broken packages. This seems a serious flaw that should be fixed. 2. Not only do higher priority packages totally eclipse lower priorities, whatever version, but yum_priorities also makes it seem like they aren't even present. When a dependency is eclipsed, yum queries with --showduplicates will tell you there *is* no package which satisfies the missing requirement, making it look like the repository is broken. You have to disable all plugins to get the correct answer: $ yum --showduplicates --noplugins list perl-Archive-Tar Finally, I'd like to ask if there have been any developments, or new advice anyone can offer on the topic, since November 2009? Thanks, Nick 1. http://thread.gmane.org/gmane.linux.centos.general/86563 2. An example of when yum_priorities bites included here: http://www.noodlefactory.co.uk/~nick/wu-lee/Notes/YumPrioritiesPitfalls Comments welcomed.

2 3

OpenOffice.org 3.1.1 Calc autofill does not work
by Nicholas 12 Aug '10

12 Aug '10

Hi all, Has anyone upgraded OpenOffice.org 3.1.1 on Centos 5.3? Everything seemed fine but I have found 1 problem on Calc. The autofill does not work. Example, when I type "Jan" in cell A5 and drag the handle to cell D5, the Fill Settings dialog box pops up instead of the Feb, Mar, Apr filling in the cell automatically. When OpenOffice.org 3.1.1 from Sun is installed, it works. Is there some setting in CentOS that needs to be done? -- Nicholas AS -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

2 1

manage (iscsi storage) LVM
by Götz Reinicke - IT-Koordinator 11 Aug '10

11 Aug '10

Hi, it is possible to create and setup/format volumes on a iscsi storage on one server and than disconnect and attache the storage to an other server. AFAIK on the 'new' server I do have to launch an LVM-scan command ... after login to the iscsi target. But which LVM-command and syntax was it? Thanks for any hint! :) /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

2 2

need help about top command and this deb ug message
by adrian kok 11 Aug '10

11 Aug '10

Hi all When I run top command, it suddenly shows one message and few second shows another one debug2: channel 0: window 31129 sent adjust 34407 What is this? Thank you

3 4

Latest BackupPC release in CentOS testing repo
by Max Hetrick 11 Aug '10

11 Aug '10

BackupPC released 3.2.0 as a stable version a few weeks ago. The most current release is 3.1.0 in the testing repository. Are there any plans that this will be updated to 3.2.0 in the repo some time down the road? Also, will the BackupPC package be moved out of testing and into extras ever? Or are there reasons behind this that are more complicated, making it not "stable" to be in extras? I've been running the 3.1.0 RPM for a long time with no issues. Just curious. Thanks! Max

2 2

Scripting for Centos security advisory database
by Fajar Priyanto 11 Aug '10

11 Aug '10

Hi all, Where can I find Centos Security Advisory database? The one that I believe similar with RHSA? 2ndly, is there any script available to check if there's any CESA against my installed Centos? Thank you very much.

4 6

Automated Reply from Dieter Thiel <centos-announce@centos.org>
by Dieter Thiel 11 Aug '10

11 Aug '10

Abwesenheitsnotiz: Vielen Dank für Ihre Nachricht. Ich bin ab dem 16.08. wieder im Büro erreichbar. In dringenden Fällen wenden Sie sich bitte an Herrn Ostermann, Email <ostermann(a)dimast.de>. Vielen Dank!

1 0

sshd bug?
by Matt Keating 11 Aug '10

11 Aug '10

Hi, I've found a bug/problem with my centos 5.5 server. Any users who have a password of 9 characters or more, only the first 9 characters are used by the OS... eg. i set my password to "123456789" and i try logon via ssh with password "123456789ofgjdfuh" - it lets me in. and if i set my password to "qwertasdfGHJB" and i enter "qwertasdfSDWQWSDS" - it lets me in... The 'passwd' command only recognises the first 9 characters too... Has anyone seen this before, or know how to fix it? I feel its a major security risk and would like it fixed ASAP. Thanks, Matt

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