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fsck.ext4 Failed to optimize directory
by Joakim Ziegler 24 Aug '13

24 Aug '13

I had a rather large ext4 partition on an Areca RAID shut down uncleanly while it was writing. When I mount it again, it recommends fsck, which I do, and I get the following error: Failed to optimize directory ... EXT2 directory corrupted This error shows up every time I run fsck.ext4 on this partition. How can I fix this? The file system seems to work ok otherwise, I can mount it and it doesn't complain, using it looks like it's ok, etc. -- Joakim Ziegler - Supervisor de postproducción - Terminal joakim(a)terminalmx.com - 044 55 2971 8514 - 5264 0864

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LVM RAID0 and SSD discards/TRIM
by Joakim Ziegler 24 Aug '13

24 Aug '13

I'm trying to work out the kinks of a proprietary, old, and clunky application that runs on CentOS. One of its main problems is that it writes image sequences extremely non-linearly and in several passes, using many CPUs, so the sequences get very fragmented. The obvious solution to this seems to be to use SSDs for its output, and some scripts that will pick up and copy our the sequences in proper order once it's done. I have two 512GB SSDs, and I've used LVM to set up a RAID0 between them. I've got that part running, but since I'm on CentOS 5.8 (which is what this application officially supports), I don't have a kernel with SSD discard support, and after a few days (I told you, this application is write intensive), things get very slow. Using hdparm to secure erase the drives and recreating the LVM RAID0 gets things back to speed again, but that's obviously not ideal. So, from what I understand, if I can get this thing running on CentOS 6.4, I'll get kernel discard support, and discard support in LVM when running a RAID0. I'm using ext4. Is that correct? Will this solve my problem? I want to confirm that discard support works on a RAID0 of SSDs using LVM and ext4 before I start working on getting this legacy application to run on a newer CentOS. -- Joakim Ziegler - Supervisor de postproducción - Terminal joakim(a)terminalmx.com - 044 55 2971 8514 - 5264 0864

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Setting Up LVS to Load Balance DNS
by Trevor Kates 24 Aug '13

24 Aug '13

Greetings, all: OS: CentOS 6.4 x86_64 Kernel: 2.6.32-358.14.1 I could use some assistance with setting up pulse to load balance my dns servers. I've configured tcp and udp port 53 with the piranha gui, set up arptable rules on the real servers and added the virtual ip to the bond0 interface on the real servers, but I'm still having no luck in getting things going. A dig against the virtual ip address simply times out and ipvsadm shows no servers under the UDP connection for the virtual IP I defined in lvs.cf. Nanny also complains in /var/log/messages like so: READ to x.x.x.x timed out I've attached my lvs.cf and sysctl.conf files for the lvs server and real dns servers. Any help or nudges in the right direction would be greatly appreciated! Thanks. --

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JOB | (Amsterdam, the Netherlands) | Linux Systems Administrator (take ownership of hardware procurement and supplier relationships)
by james tobin 23 Aug '13

23 Aug '13

Hello, I am working with an employer that is looking to hire a Linux systems administrator (with an automation and scripting approach) to take ownership of hardware procurement and supplier relationships. This is a permanent job based in Amsterdam, the Netherlands (relocation assistance is available). Consequently should any members of this list like to discuss with me further; they may reach me off-list using "JamesTobin (at) Linuxmail (dot) org". All the best, James

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Make server reboot by itself instead of dropping to kernel debugger
by Alexander Farber 23 Aug '13

23 Aug '13

Hello, on OpenBSD if you put ddb.panic=0 into /etc/sysctl.conf, the server won't drop into debugger on kernel panic. Is there please a similar setting for CentOS 6.4 / 64 bit? The background is that I have a new dedicated server with Haswell CPU and once a month it is stuck, displaying kernel trace (the other users at my hoster have similar problems). So the users of my web site complain. I'd prefer my web server to just reboot Thank you Alex

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RHEL Subscriptions
by Anthony K 23 Aug '13

23 Aug '13

Hello List Members. I was recently approached by Dell stating that I HAVE TO renew my Red Hat Subscriptions. I challenged this statement and was informed that this has always been the case and that all servers I have bought off of Dell over the years need to have current subscription! I've been searching the Red Hat website to find where this is stated but can't seem to locate this info. So, is Dell having me on? Cheers, ak.

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Re: [CentOS] k3b -> cddb doesn't work
by Lamar Owen 23 Aug '13

23 Aug '13

Whee. Here we go again. There are properly built and packaged RPMs for Jorg's (sorry, android keyboard I'm using doesn't have the proper marking for the o there) cdrtools, for EL6. I'm using them on a few installs where wodim just simply does the wrong thing and cdrtools does the right thing. Those packages properly obsolete the wodim ones and install in the correct places with the correct dependencies; I want to say they're from the city-fan.org repo. (I'm not on my EL6 laptop, but on my phone right now,so I can't easily check). In my case, I rebuilt from the source RPM, and that worked well. Once I'm back where I can check I'll verify the repo and provide a pointer (again; it is in the archives of this list.....).

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yum update after update from 6.3 to 6.4 - problems with epel repository.
by Rafał Radecki 23 Aug '13

23 Aug '13

Hi All. I've updated my system from 6.3 to 6.4. In my /etc/yum.repos.depel.repo I have: [epel] name=Extra Packages for Enterprise Linux - $basearch #baseurl=http://download.fedoraproject.org/pub/epel/6/$basearch mirrorlist= http://mirrors.fedoraproject.org/mirrorlist?repo=epel-6&arch=$basearch failovermethod=priority gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-5 #gpgkey=http://download.fedora.redhat.com/pub/epel/RPM-GPG-KEY-EPEL-5 exclude=mongodb* enabled=1 gpgcheck=0 Yum variables are ok: # python -c 'import yum, pprint; yb = yum.YumBase(); pprint.pprint(yb.conf.yumvar, width=1)' Loaded plugins: fastestmirror {'arch': 'ia32e', 'basearch': 'x86_64', 'releasever': '6', 'uuid': 'd42ce92e-d28b-4637-8365-2cf02892ee58'} But yum exits with error: # yum --disablerepo='*' --enablerepo='epel' search iotop Loaded plugins: fastestmirror, security Loading mirror speeds from cached hostfile Error: Cannot find a valid baseurl for repo: epel I've tried to open http://mirrors.fedoraproject.org/mirrorlist?repo=epel-6&arch=x86_64 but got # Bad Request 2960 # {'repo': u'epel-6', 'IP': IP('195.8.99.234'), 'client_ip': u'195.8.99.234', 'metalink': False, 'arch': u'x86_64'} Am I doing something wrong? Any clues? Best regards, Rafal.

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pam oddity
by m.roth＠5-cent.us 23 Aug '13

23 Aug '13

CentOS 6.4, 64-bit. Aug 23 08:32:33 <workstation> kdm: :0[11133]: PAM unable to dlopen(/lib64/security/pam_gnome_keyring.so): /lib64/security/pam_gnome_keyring.so: cannot open shared object file: No such file or directory Aug 23 08:32:33 <workstation> kdm: :0[11133]: PAM adding faulty module: /lib64/security/pam_gnome_keyring.so So I do yum provides /lib64/security/pam_gnome_keyring.so, and I get gnome-keyring-pam-2.28.2-8.el6_3.x86_64 : Pam module for unlocking keyrings Repo : base Matched from: Filename : /lib64/security/pam_gnome_keyring.so 6.3? Is this missing from 6.4, or has it been dropped, or what? mark

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USB Audio sound card
by Glenn Eychaner 23 Aug '13

23 Aug '13

All- Ah, the saga of the 1U workstation continues. So, in all my work configuring the thing, I completely forgot about AUDIO; I only realized my mistake when I went on a cable-measuring expedition this morning. Unfortunately, none of the 1U servers I've been looking at come with audio outputs (there aren't even audio headers on the motherboard), and I've used the only availabnle slot for my fancy graphics card! Now, a lesser (or maybe smarter) individual would give up at this point, and go back to MiniITX or a 2U rackmount (if I could find a short-depth one). "Nay!" I say. What about USB Audio? I don't need 5.1 or 7.1 audio here; I'm plugging in a Dell monitor soundbar. A quick search of the web says that yes, these devices will work under CentOS and show up as /dev/dspX devices. So, do devices like these: SYBA SD-CM-UAUD USB Stereo Audio Adapter http://www.newegg.com/Product/Product.aspx?Item=N82E16812186035 Turtle Beach Audio Advantage Amigo II USB Interface Sound Card & Headset Adapter http://www.newegg.com/Product/Product.aspx?Item=N82E16829118008 StarTech ICUSBAUDIO USB to Stereo Audio Adapter Converter http://www.newegg.com/Product/Product.aspx?Item=N82E16829128002 work under CentOS 6? Is there one that anyone can recommend? -G. -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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