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system hangs
by m.roth＠5-cent.us 26 Feb '14

26 Feb '14

Every so often, one of our servers will go into what I can only describe as an undefined state: it pings, but there's zero access - you can't ssh in, and if I go plug a keyboard and monitor into the server itself, you can see the monitor's live, it's not the "monitor turned off" color, but there is zero response to the keyboard. The upshot is that I wind up having to power cycle it. Well, it just happened again on one of our servers Friday evening, as I found this morning. Looking at the logs this morning, I see that sar last shows 10:20:01 PM all 34.38 0.00 8.29 0.00 0.00 57.33 On of my users dropped me an email at 22:45 that it was "off", and the last things I see in /var/log/messages are one of those annoying Feb 21 22:26:23 <server> kernel: INFO: task perl:20596 blocked for more than 120 seconds. Feb 21 22:26:23 <server> kernel: "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. I also see Feb 21 22:26:23 <server> kernel: perl D ffffffff80158250 0 20596 20557 which, as I just found by googling perl NOTLD, means that this is in a kernel uninterruptable state In addition, in the stack trace, some nfs messages Feb 21 22:26:23 <server> kernel: [<ffffffff886b58d1>] :nfs:nfs_wait_bit_uninterruptible+0x0/0xd So, it *appears* to be either an NFS issue, or a NIC issue. The user's home directory server is CentOS running 6.5, and the server that hung is 5.10. Mount on the formerly hung server, su-d to his account shows merely nfs, so I'm guessing it's NFS3. Looking at lsmod and /var/log/dmesg, I see it's running the tg3 NIC driver. Anyone else seeing this, and if so, any thoughts on the matter? Note that I've had this on Penguins, which are all Supermicro, and they're using the igb NIC driver, but the one this past weekend is a Dell, so it's not just one system. mark

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Cannot install rhev-agentd on CentoOS CentOS release 6.5 (Final)
by iida 26 Feb '14

26 Feb '14

Hi All, I am trying to install rhev-agentd but i cannot able to install it. I havefollowed this documentation:http://wiki.centos.org/HowTos/oVirt I'm Trying Command: wget -q http://dev.centos.org/centos/6/ovirt/ovirt.repo File Not Found. Please guide me!

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Migration from 32 to 64 bits
by Fabrizio Di Carlo 25 Feb '14

25 Feb '14

Hello to all, currently I have CentOS 6.4 32 bit, very simple setup on my notebook, I want to migrate it from 32 to 64 bits cause I want to play with some VMs etc etc. Do you have some suggestions on how to do backup of folders (mainly I have 1 user) or just copy the user folder and stop? Fabrizio -- "The intuitive mind is a sacred gift and the rational mind is a faithful servant. We have created a society that honors the servant and has forgotten the gift." (A. Einstein) "La mente intuitiva è un dono sacro e la mente razionale è un fedele servo. Noi abbiamo creato una società che onora il servo e ha dimenticato il dono." (A. Einstein) Fabrizio Di Carlo

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Re: [CentOS] Upgrading to CentOS 6
by Mike Burger 25 Feb '14

25 Feb '14

> I recently built a CentOS 6 system as my main machine at home. > With a bit of help from members of this list, it is now working > better than the machine it replaced (RIP). > The new machine works so well, that I would like to convert some > CentOS 5 machines to CentOS6. > > I did some research on the web and the new install is still considered > the proper way to upgrade CentOS. Same as Fedora and RHEL. > The question becomes, "What makes the Ubuntu developers so > clever that they can do major upgrades through their apt based > update system?" > > There must be some sort of gotcha or tradeoff involved in allowing this. > > Does anyone have any insights on why they can get away with this > while CentOS cannot? To add to Les' points, Fedora has offered in place upgrade, going at least as far back as FC1 -> FC2. I seem to recall that I used to be able to upgrade my free RHL (non-enterprise) versions in place, as well, but I won't swear to it. -- Mike Burger http://www.bubbanfriends.org "It's always suicide-mission this, save-the-planet that. No one ever just stops by to say 'hi' anymore." --Colonel Jack O'Neill, SG1

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Re: [CentOS] KVM and Win7-64 Sound
by david 25 Feb '14

25 Feb '14

At 11:35 PM 2/24/2014, Arun Khan wrote: >On Tue, Feb 25, 2014 at 6:40 AM, david <david(a)daku.org> wrote: > > > > Sound does not work in the Windows 7 (64-bit) PRO installation as a > > Virtual Machine, and I have tried specifying the emulated hardware as > > AC97, and ICH6. > >The few times I have tried desktop VM with LKVM, the user experience >within the VM, has been spotty. Whereas with VB it has been >acceptable (same no. of CPUs, RAM etc in LKVM v/s VB). > >For desktop VM, I would suggest Virtual Box. Thanks for that pointer, Arun. I was about to try VB to see how it behaved, and am encouraged by your implication of success. David Kurn

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Need help resolving yum update issues on mixed architecture system
by Alfred von Campe 25 Feb '14

25 Feb '14

I have been using 32-bit CentOS since the 4.X days without a real need for 64-bit, but in preparation for CentOS 7, I have installed 64-bit CentOS 6 on a test system to qualify all our builds. However, in order to build some of our current 32-bit applications, I had to install some i686 packages, including glib. Now when I try to do a "yum update" on this test system, I get the dreaded "Error: Multilib version problems found." issue. I have tried following the instructions from yum (--exclude=glib.i686, yum check, etc.) to resolve this to no avail. What is the best way to proceed with the "yum update" so that all (64-bit and 32-bit) packages are updated? Thanks, Alfred

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FYI: CentOS legalese
by jb 25 Feb '14

25 Feb '14

Putting the Genie Back in the Bottle: More RedHat Legal Shenanigans with CentOS http://nerdvittles.com/?p=8721 Closing the Book on CentOS: [...] http://nerdvittles.com/ Thanks to the author of the above articles. jb

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Multicast packages dropped
by Uwe.Poliak＠amann.com 25 Feb '14

25 Feb '14

Hi, I have recently updated one of my systems from CentOs 6.4 to CentOS 6.5. This systems is used as a RIPv2 routing server with quagga which is the termination point of some GRE tunnels. While running CentOS 6.4 I see the multicast packages arriving at the eth0 and the GRE tunnel interface. While running under CentOs 6.5 I can see the multicast packages arriving at the eth0 but not on the GRE tunnel interface. I am receiving and sending routes at the eth0 interface, but I am only able to send updates through the GRE tunnel not receive them. All interfaces are multicast enabled: eth0 Link encap:Ethernet Hardware Adresse 00:50:56:B8:27:52 inet Adresse:10.139.10.2 Bcast:10.139.10.255 Maske:255.255.255.0 inet6 Adresse: fe80::250:56ff:feb8:2752/64 Gültigkeitsbereich:Verbindung UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:7190594 errors:0 dropped:0 overruns:0 frame:0 TX packets:6209862 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:1000 RX bytes:2425775260 (2.2 GiB) TX bytes:2357002233 (2.1 GiB) net2bdo Link encap:UNSPEC Hardware Adresse 0A-8B-0A-02-FF-FF-E0-A4-00-00-00-00-00-00-00-00 inet Adresse:192.168.250.21 P-z-P:192.168.250.22 Maske:255.255.255.252 UP PUNKTZUPUNKT RUNNING NOARP MULTICAST MTU:1400 Metric:1 RX packets:118143 errors:7913 dropped:0 overruns:0 frame:7913 TX packets:115334 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:0 RX bytes:21714417 (20.7 MiB) TX bytes:32111515 (30.6 MiB) net2bdp Link encap:UNSPEC Hardware Adresse 0A-8B-0A-02-00-00-E0-18-00-00-00-00-00-00-00-00 inet Adresse:192.168.250.25 P-z-P:192.168.250.26 Maske:255.255.255.252 UP PUNKTZUPUNKT RUNNING NOARP MULTICAST MTU:1400 Metric:1 RX packets:78025 errors:7001 dropped:0 overruns:0 frame:7001 TX packets:85049 errors:0 dropped:0 overruns:0 carrier:0 Kollisionen:0 Sendewarteschlangenlänge:0 RX bytes:18388666 (17.5 MiB) TX bytes:38376786 (36.5 MiB) While doing a tcpdump (tcpdump –ni eth0 proto 47 | grep 224.0.0.9), I can see the multicast packages arriving inside the GRE tunnel (see last package): 10:40:34.366661 IP 10.139.10.2 > 192.168.252.26: GREv0, length 536: IP 192.168.250.25.router > 224.0.0.9.router: RIPv2, Response, length: 504 10:40:34.366680 IP 10.139.10.2 > 192.168.252.26: GREv0, length 536: IP 192.168.250.25.router > 224.0.0.9.router: RIPv2, Response, length: 504 10:40:34.366702 IP 10.139.10.2 > 192.168.252.26: GREv0, length 536: IP 192.168.250.25.router > 224.0.0.9.router: RIPv2, Response, length: 504 10:40:34.366721 IP 10.139.10.2 > 192.168.252.26: GREv0, length 356: IP 192.168.250.25.router > 224.0.0.9.router: RIPv2, Response, length: 324 10:40:39.830508 IP 192.168.252.26 > 10.139.10.2: GREv0, length 136: IP 192.168.250.26.router > 224.0.0.9.router: RIPv2, Response, length: 104 While doing the same on the Tunnel interface (tcpdump –ni net2bdp host 224.0.0.9), I do not see the incoming multicast packages any more: 10:42:32.391849 IP 192.168.250.25.router > 224.0.0.9.router: RIPv2, Response, length: 504 10:42:32.391887 IP 192.168.250.25.router > 224.0.0.9.router: RIPv2, Response, length: 504 10:42:32.391945 IP 192.168.250.25.router > 224.0.0.9.router: RIPv2, Response, length: 504 10:42:32.391975 IP 192.168.250.25.router > 224.0.0.9.router: RIPv2, Response, length: 324 I am using quagga 0.99.15 as the RIPv2 daemon. The configuration is as follows: Zebra.conf: interface eth0 multicast ipv6 nd suppress-ra ! interface net2xxx multicast ipv6 nd suppress-ra ! interface net2yyy multicast ipv6 nd suppress-ra ! ! ip forwarding ! Ripd.conf: ! key chain cis-xxx-yyyy key 1 key-string xxxxxx ! key chain cis-aaa-bbb key 1 key-string xxxxxx ! interface eth0 ip rip send version 2 ip rip receive version 2 ! interface net2xxx ip rip receive version 2 ip rip authentication mode md5 auth-length old-ripd ip rip authentication key-chain cis-xxx-yyy ! interface net2yyy ip rip receive version 2 ip rip authentication mode md5 auth-length old-ripd ip rip authentication key-chain cis-aaa-bbb ! router rip version 2 redistribute connected redistribute static network network-address-of -eth0/24 network network-address-of-net2xxx/30 network network-address-of-net2yyy/30 distribute-list incoming in distribute-list out-to-fw out eth0 distribute-list out-to-tunnel out net2xxx distribute-list out-to-tunnel out net2yyy ! access-list incoming permit 10.0.0.0/8 access-list incoming permit 172.16.0.0/12 access-list incoming permit 192.168.0.0/16 access-list incoming deny any access-list out-to-fw permit x.x.x.0/23 access-list out-to-fw permit x.x.0.0/16 access-list out-to-fw permit x.x.x.0/23 access-list out-to-fw permit x.x.x.0/24 access-list out-to-fw permit x.x.x.0/23 access-list out-to-tunnel deny y.y.0.0/16 access-list out-to-tunnel permit 10.0.0.0/8 access-list out-to-tunnel permit 172.16.0.0/12 access-list out-to-tunnel permit 192.168.0.0/16 access-list out-to-tunnel deny any ! line vty rip authentication is working as the routes are transmitted to the remote router but not from the remote router to the local server. The RIP or ZEBRA configuration were the same before the update (working) and after the update (no longer working). Has there be anything changed in multicast handling in combination with GRE tunnels with CentOS 6.5? Do you need any additional information? Mit freundlichen Grüßen / Kind regards Uwe Poliak AMANN GROUP IS – Information Systems, Technical Services Phone +49 7143 277-420, Fax +49 7143 277-901 420 E-Mail Uwe.Poliak(a)amann.com<mailto:Uwe.Poliak@amann.com> Amann & Soehne GmbH & Co. KG Hauptstrasse 1, 74357 Boennigheim – Germany www.amann.com<http://www.amann.com/> Kommanditgesellschaft Sitz Boennigheim; USt-IdNr. DE 144 960 031 Registergericht Stuttgart HRA 300309 Pers. Haftende Gesellschafterin: Amann Beteiligungen GmbH Sitz Boennigheim Registergericht Stuttgart HRB 301997 Geschaeftsfuehrer: Bodo Th. Boelzle (Vorsitzender), Wolfgang Findeis, Peter Morgalla

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Problem with cron
by Joseph Hesse 25 Feb '14

25 Feb '14

I have a root cron job that powers down my server every day at 1am and 6pm. The output of '# crontab -l' is shown below. * 1,18 * * * poweroff Last night, after the server powered down at 6pm, I decided I wanted to use the server so I started it with the power button. The server, after a minute or so, powered itself down. This behaviour happened repeatedly until I waited past 7pm. Then the server did not poweroff. Apparently a cron job that executed correctly at 6pm was executing minutes past 6pm when the server was restarted. This is totally unexpected behavior. Here is the output of the cron log file. The name of the server has been redacted. # grep -i 'Feb 22' cron-20140223 | grep -i poweroff Feb 22 18:00:01 xxxxxxxxxx CROND[2875]: (root) CMD (poweroff) Feb 22 18:12:01 xxxxxxxxxx CROND[1894]: (root) CMD (poweroff) Feb 22 18:16:01 xxxxxxxxxx CROND[1893]: (root) CMD (poweroff) Feb 22 18:18:01 xxxxxxxxxx CROND[1896]: (root) CMD (poweroff) Feb 22 18:22:01 xxxxxxxxxx CROND[1915]: (root) CMD (poweroff) Feb 22 18:25:01 xxxxxxxxxx CROND[1919]: (root) CMD (poweroff) Feb 22 18:34:01 xxxxxxxxxx CROND[1890]: (root) CMD (poweroff) Is there a fix for this behavior? Thank you, Joe

3 3

Re: [CentOS] Monitor Wireless Networks OT
by Tom Bishop 25 Feb '14

25 Feb '14

On Thu, Feb 20, 2014 at 9:39 AM, Joseph Hesse <joehesse(a)gmail.com> wrote: > Hi, > I am having interference with my neighbouring wireless networks. > Is there a linux tool that enables me to monitor the ESSID, channel, > power output and other information for neighbouring wireless networks? > I am especially interested in the channel so I can choose a different one. > Thank you, > Joe > _______________________________________________ > CentOS mailing list > CentOS(a)centos.org > http://lists.centos.org/mailman/listinfo/centos > There is a really good Android app, WIFI analyzer https://play.google.com/store/apps/details?id=com.farproc.wifi.analyzer if you have access to a phone or better yet a tablet. Very nice and allows you to look at all kinds of things, I also know of another one called Wifi Radar for linux but not nears as good.

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