Discuss December 2013

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176 participants
156 discussions

Story of an email
by Timothy Murphy 03 Dec '13

03 Dec '13

I'm running postfix + dovecot on my CentOS server, together with amavisd, clamd and spamassassin, following the instructions in <http://wiki.centos.org/HowTos/postfix>. As far as I can see it is all working, but I must admit I'm not clear exactly what path an incoming email travels along. I asked this question before, and someone suggested a document I should read, but unfortunately I've mislaid the note I made at the time. So if someone could enlighten me - or point to a source of enlightenment - I should be most grateful. -- Timothy Murphy e-mail: gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin 2, Ireland

10 14

kvm: vm root fs becomes ro
by Paul Heinlein 03 Dec '13

03 Dec '13

I've a the following happen a couple times now, and my internet searches are failing to locate an answer to the problem. We've got a few servers that primarily house VMs using KVM. They've got E-3 cpus and 32 GB RAM, and they run stock CentOS 6.4, fully patched (not yet migrated to 6.5). The VM disk images are housed on an NFS server. None of the VMs is particularly resource-hungry. They run a variety of Linux distros: CentOS 5/6, Debian 6/7. I'll start to see the VMs fail to write files to their local filesytems. No machine in the chain has rebooted or been updated in any significant way, but the root filesystem is off-limits. (This will happen on just one of our servers; the other VM platforms run without issue.) In /var/log/messages, I'll see the following entry for each impacted VM: <date> <host> kernel: kvm: <pid>: cpu0 disabled perfctr wrmsr: 0xc1 data 0xabcd In /var/log/libvirt/qemu/<vm-name>.log, I'll see block I/O error in device 'drive-virtio-disk0': Stale file handle (116) Oddly, the underlying host might be running, say, five VMs, but only four of them will get the log messages, and show the read-only symptoms, while the fifth just keeps chugging along. Googling suggests that the "disabled perfctr wrmsr" message is harmless, but my experience suggests otherwise. Any hints, workarounds, or relevent information is very welcome. Thanks! -- Paul Heinlein heinlein(a)madboa.com 45°38' N, 122°6' W

4 3

Thanks on 6.5
by m.roth＠5-cent.us 03 Dec '13

03 Dec '13

Hey, Johnny et al, Thanks for the hard work, and quick followup to upstream. What's especially nice for us, and for other folks using CentOS at US federal gov't agencies, is that finally, the stock ssh-agent works seamlessly with pkcs11 and PIV/CAC cards, which is being required across the board. We'd been building our own openssh pieces... (and it was my manager that pushed that enhancement through a RH request <g>) mark

2 1

Where to put the kernel driver for a Fibre Channel HBA card.
by Arun Khan 02 Dec '13

02 Dec '13

CentOS 6.4 (amd64) stock kernel. HBA FC Accusys ACS 63200NT I built the driver from source, insmod activates the device and I can see the 24 TB storage volume via 'parted --list' I have created a XFS files system and mounted it under /srv/ Where do I need to install the driver in /lib/modules/ ... directory tree so that it is loaded automatically when the system boots? TIA, -- Arun Khan Sent from my non-iphone/non-android device

2 3

Problem upgrading from CentOS 6.4 to 6.5
by Gilbert Sebenste 02 Dec '13

02 Dec '13

Hello everyone, I had an issue with one of three servers upgrading from 6.4 to 6.5. It did not have the CR repo enabled. It failed dueing install, but I didn't catch the error (bad, bad, I know). OK, so it told me to run yum-complete transaction. After going through and figuring out what it had to do, it stops with this error: (etc, etc...) --> Processing Dependency: pkgconfig(ORBit-2.0) for package: libbonobo-devel-2.24.2-5.el6.i686 --> Processing Dependency: ORBit2-devel >= 2.7.5 for package: libbonobo-devel-2.24.2-5.el6.i686 ---> Package libgnomecanvas-devel.i686 0:2.26.0-4.el6 will be erased ---> Package polkit-docs.i686 0:0.96-5.el6_4 will be erased --> Processing Dependency: polkit-docs = 0.96-5.el6_4 for package: polkit-devel-0.96-5.el6_4.i686 --> Running transaction check ---> Package libbonobo-devel.i686 0:2.24.2-5.el6 will be erased ---> Package polkit-devel.i686 0:0.96-5.el6_4 will be erased --> Finished Dependency Resolution Error: Trying to remove "yum", which is protected You could try using --skip-broken to work around the problem ** Found 216 pre-existing rpmdb problem(s), 'yum check' output follows: ModemManager-0.4.0-5.git20100628.el6.i686 is a duplicate with ModemManager-0.4.0-3.git20100628.el6.i686 1:NetworkManager-0.8.1-66.el6.i686 is a duplicate with 1:NetworkManager-0.8.1-61.el6_4.i686 1:NetworkManager-glib-0.8.1-66.el6.i686 is a duplicate with 1:NetworkManager-glib-0.8.1-61.el6_4.i68 (etc) Any ideas on how to fix this? A "yum update" tells me to run yum-complete-transaction. For those who respond, I thank you for your time, I appreciate it! Gilbert ******************************************************************************* Gilbert Sebenste ******** (My opinions only!) ****** *******************************************************************************

3 7

NetFilter Detection
by Robert Clove 02 Dec '13

02 Dec '13

Hi All, I was searching around but was not able to find out. We all know that packet traverses through the Net Filter hooks but how to practically realize that. Please guide Regards Clove

2 1

CentOS Hardware clock time setting.
by Anand Singh 02 Dec '13

02 Dec '13

Hi, I would like to sync my CentOS 6.3 hardware clock time to my NTP server's time. Can I do that without reboot the hosts? If yes, it would be great if anyone of you can provide me steps to do that. I am newbie in CentOS. Thanks, Anand Singh

5 5

Thank You To The CentOS Team
by Mark LaPierre 02 Dec '13

02 Dec '13

Hey all you dedicated folks out there who support the CentOS project. Thank you all for your dedicated effort and the great deal of work to get the 6.5 release up and running. Thank you all! -- _ °v° /(_)\ ^ ^ Mark LaPierre Registered Linux user No #267004 https://linuxcounter.net/ ****

10 9

Kernel panic with VMware Workstation 8.0.6 and 6.5 kernel
by B.J. McClure 02 Dec '13

02 Dec '13

There is apparently a kernel bug that creates a kernel panic when starting a windows guest in vmware workstation. I have experienced this bug on two machines, both with workstation 8.0.6 but it has been reported with other versions as well: https://communities.vmware.com/message/2318686 . Booting kernel 2.6.32-358.23.2.el6.x86_64 instead of 2.6.32-431.el6.x86_64 resolves the issue. Just a heads up for those who may encounter it. Cheers, B.J.

1 0

too many groups for a user?
by Dirk Olmes 02 Dec '13

02 Dec '13

Hi, we're exporting a number of directories via samba shares. To manage access for individual users, the files are put into different groups, users who get access to the files will be put into the respective groups. It seems there's a limited number of groups that a user can be member of - googling around comes up with wildly different numbers from 16 up to 64k. The limit for CentOS seems to be around 32 ... can anyone confirm? Thanks, -dirk

1 1

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Discuss December 2013