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NFS exports network mask
by Carlos S 23 Jun '10

23 Jun '10

Hi, I need to export NFS shares to all clients in a subnetwork, except that one client will have different NFS options. I am not sure how to write subnest mask for this in exports file. For all clients it was easy as all I had to do was 10.0.0.0/16 or 10.0.0.0/255.255.0.0. How do I modify exports file to have special rule/entry for this particular IP? Any pointers on how to do this? -- Thanks, CS

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New kernel causes hardware error?
by Eric Deis 22 Jun '10

22 Jun '10

I have recently upgraded to 2.6.18-194.3.1.el5 and within several days the machine crashed with the following error (repeating in mcelog): MCE 0 HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor CPU 2 BANK 8 MISC 41 MCG status: MCi status: Error overflow Uncorrected error MCi_MISC register valid Processor context corrupt MCA: MEMORY CONTROLLER AC_CHANNEL0_ERR Transaction: Address/Command error Memory address parity error Memory corrected error count (CORE_ERR_CNT): 911 Memory transaction Tracker ID (RTId): 41 Memory DIMM ID of error: 0 Memory channel ID of error: 0 Memory ECC syndrome: 0 STATUS ea10e3c0008000b0 MCGSTATUS 0 MCE 0 HARDWARE ERROR. This is *NOT* a software problem! Please contact your hardware vendor CPU 2 BANK 8 MISC 41 MCG status: MCi status: Error overflow Uncorrected error MCi_MISC register valid Processor context corrupt MCA: MEMORY CONTROLLER AC_CHANNEL0_ERR Transaction: Address/Command error Memory address parity error Memory corrected error count (CORE_ERR_CNT): 7970 Memory transaction Tracker ID (RTId): 41 Memory DIMM ID of error: 0 Memory channel ID of error: 0 Memory ECC syndrome: 0 STATUS ea17c880008000b0 MCGSTATUS 0 Everytime the error occurs, the only variables that change are CORE_ERR_CNT and STATUS. Since this appears to be a memory error, I have run memtest86+ many times. However it does not report any errors. Reverting back other Kernels (below) and testing, this above error would be generated only once (after boot) and then not be reported again and definitely wasn't causing kernel panic and crashing the machine. CentOS-5.4 (2.6.18-164.15.1.el5) CentOS (2.6.18-164.9.1.el5) CentOS (2.6.18-164.el5) Would this error indicate a motherboard or CPU problem? How can I diagnose? or is there something funny with the Kernel? Hardware: Supermicro X8DTL-iF motherboard. Intel Server Xeon E5502 1.86GHz Nehalem 8GB Ram Kingston DDR3-1333 w/ Parity w/ Thermal Sensor I have read on bugzilla note about mcelog and not supporting nehalem processor during error decoding. I think this is fixed in Centos 5.5, but maybe there is still a bug? https://bugzilla.redhat.com/show_bug.cgi?id=473392

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XFS on CentOS
by Boris Epstein 22 Jun '10

22 Jun '10

Hi all, Does anybody know why unlike so many Linux distros (Fedora, Ubuntu, OpenSUSE) CentOS does not come with XFS support by default but rather requires custom modifications after the install in order for you to be able to support XFS on your CentOS machine? Just seems a little odd given how much CentOS is oriented to be used as a server OS. Thanks. Boris.

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OT: Recommendation for a good Internationalized terminal software
by Digimer 22 Jun '10

22 Jun '10

Hi all, We've got server-based application that runs on CentOS. Until now, most of our customer's end-users have accessed the application using either PuTTY or Teraterm. I was asked yesterday to try and find internationalized add ons or alternatives for our new Asian customers (Japan, Korea and China atm). I figured if anyone would be able to recommend terminal emulation programs, it'd be you guys. So, would anyone be able to recommend any windows-based, Asian character set telnet/ssh terminal apps? Thanks! Sorry for being a bit off topic, too. :) -- Digimer E-Mail: linux(a)alteeve.com AN!Whitepapers: http://alteeve.com Node Assassin: http://nodeassassin.org

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Migrating away from Nagios
by Jane Curry 22 Jun '10

22 Jun '10

I'd try Zenoss. I wrote a big paper comparing Nagios, OpenNMS and Zenoss ( http://www.skills-1st.co.uk/papers/jane/open_source_mgmt_options.html ) - it's nearly 2 years back now but many of the basics are the same. At that time, I plumped for Zenoss but, to be fair, my main negative on OpenNMS was that it is written in Java - it did pretty-well everything I needed. On the Zenoss front, my main winges were the quality and reliability of the documentation and the code. Zenoss has done a HUGE amount of work on code reliability since then and the documentation is coming along. It runs Nagios plugins if you need that, and will use SNMP, WMI and ssh as protocols to talk to a device. The community is very active and, although Zenoss also have a commercial offering (Enterprise) as well as the free Core, we still seem to get very good air-time from the developers to help resolve issues and to take input from the community. If you want further help, please ask! Cheers, Jane -- Zenoss Master, Tivoli Certified Consultant & Instructor Skills 1st Limited, 2 Cedar Chase, Taplow, Bucks, SL6 0EU, UK. Registered in England & Wales, Company No. 3458854. Tel: +44 (0)1628 782565 Skype: jane_curry_uk Email: jane.curry(a)skills-1st.co.uk Web: http://www.skills-1st.co.uk Copyright (c) 2010 Jane Curry < jane.curry(a)skills-1st.co.uk >. All rights reserved.

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Re: [CentOS] Migrating away from Nagios
by Phil Manuel 22 Jun '10

22 Jun '10

----- Original Message ----- > >> Did you consider opennms - and if so was there a reason for not using >> it? It has some integration for provisioning, but I'm not exactly sure >> how it works and the latest release made some changes. > > its on the list of things I want to get to one day, not quite there yet. > Although, higher on the list at the moment is the whole flapjack stack > and how it integrates with cucumber! I didn't know about that, but the first googled hit says you are supposed to be able to write reusable tests in a human-readable language which sounds way too unrealistic to ever work. And I want a tool that understands network equipment natively, not just it's own clients on only the hardware/OS's where you are able to run them. I can understand putting off testing OpenNMS back in the day when you had to get your own Sun JVM which was particularly painful on CentOS, but it has been bundled in the yum repo for a while now. And maybe someday enough bugs will be shaken out of the version of openjdk in Centos that it won't be needed... ----- Original Message ----- Hi, Has anyone looked at using icinga ? I know it replaces the front end of nagios, and uses the same (slightly modified ?) backend, using the same plugins. http://www.youtube.com/watch?v=jLqhXvGTazI Phil.

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Migrating away from Nagios
by Joseph L. Casale 22 Jun '10

22 Jun '10

I have to rebuild a new Nagios box and thought this might be a good time to migrate away. I use snmp mostly for everything but with the fork Nagios endured I wonder about putting any more effort into the project. I probably should look at OpenNMS again, but the other options I think might work are Icinga (Should be trivial to migrate) or Zenoss or maybe even Zabbix? Anyone have experience in Nagios and care to share comparisons with similar projects with strong community involvement? Also, anyone currently running OpenNMS that can comment on the learning curve and level of flexibility coming from a Nagios user? Thanks! jlc

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Samba3x daily logged errors with Win7 clients
by Steve Snyder 22 Jun '10

22 Jun '10

In the course of upgrading from CentOS 5.4 to CentOS 5.5 I changed from using the samba (v3.0.x) packages to the samba3x (v3.3.8) packages, mostly because the newer version was said to better support Win7. The Samba server services Linux, WinXP, and Win7 clients. Now I get many, many errors logged to the Samba logs shortly after 3:00 AM, but only from the Win7 clients. I get roughly 430 sets of these messages in a twenty-second (!) period: [2010/05/25 03:17:36, 1] smbd/service.c:make_connection_snum(748) create_connection_server_info failed: NT_STATUS_ACCESS_DENIED These errors are never seen in the Samba logs that track the Linux and WinXP clients, only the Win7 clients. I don't run virus scans or anything else (that I know of) on the Win7 machines in the middle of the night, but I do have the usual cron jobs running on the CentOS server around that time. Could be related to log rotation or something like that? I haven't seen a loss of connectivity, but then I don't use the client machines at 3:15AM. If there is a brief connection failure I wouldn't know it. I used my old (Samba 3.0.x) config file, user definitions and password database when I made the switch to the new (Samba 3.3.8) server and the newer code didn't seem to have any complaints with them. The client shares seem to work without any problems. Any thoughts on what could be generating all these errors? Thanks.

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Kernel independent OCFS2 packages for RHEL, Scientific Linux and CentOS
by Dag Wieers 22 Jun '10

22 Jun '10

Hi, I would like to announce a set of OCFS2 kABI-tracking kernel module packages for RHEL5, Scientific Linux 5 and CentOS-5 and kernels. These packages have been introduced into the ELRepo testing repository (http://elrepo.org/) You can find these packages at: http://elrepo.org/linux/testing/el5/ The ELRepo project is a community project providing various additional kernel modules for Red Hat Enterprise Linux and derivative kernels that aim to be kernel independent. Next to this set of OCFS 1.4.7 kernel modules the project provides dozens of kmod RPM packages and hundreds of kernel modules for a variety of hardware and kernel functionality. In this case we are looking for OCFS2 users willing to test these packages and provide feedback and support in our support channels for future users. We welcome your feedback on our mailinglist and bug-tracker, respectively at: http: //lists.elrepo.org/mailman/listinfo/elrepo http: //elrepo.org/bugs/main_page.php Kind regards, -- -- dag wieers, dag(a)wieers.com, http://dag.wieers.com/ -- [Any errors in spelling, tact or fact are transmission errors]

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Re: [CentOS] [DRBD-user] Kernel independent DRBD packages for RHEL, CentOS and Scientific Linux
by Joseph L. Casale 22 Jun '10

22 Jun '10

>This seems like duplication of effort with the CentOS people, since they >already package DRBD for CentOS 5.x (and it works very well). No its not, the CentOS packages are no longer maintained...

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