Discuss July 2010

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242 participants
194 discussions

Disks for virtualization
by David Dyer-Bennet 16 Jul '10

16 Jul '10

I'm not looking to move virtual machines between physical platforms; just want some protection between applications sharing a physical server. They'll all be using local disk in one form or another. Much the easiest to manage is just having the virtual machine use a file in dom0 as its disk. Without pre-allocating, this lets me over-commit somewhat to cover unknown future needs, for example. The alternative seems to be LVM partitions. Those are easy to throw around too, but after enough creation / destruction you can end up with your free-space fragmented so you can't use it, right? But I imagine there's a performance benefit to LVM partitions over dom0 files. For things like foswiki for internal use by a development team, and Nagios monitoring for about a dozen systems, do i need that extra performance? Does anybody have a rule-of-thumb for the difference? -- David Dyer-Bennet, dd-b(a)dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info

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Problems getting my wireles connection to work
by Mark 16 Jul '10

16 Jul '10

I have an Everex laptop (ick, but it was super cheap) that has an Atheros wireless NIC in it, but I can't seem to get it to connect to my wireless in-home LAN. Here's what I've done so far (that isn't working) - any suggestions? [root@marktop mark]# lspci | grep Ether 00:12.0 Ethernet controller: VIA Technologies, Inc. VT6102 [Rhine-II] (rev 7c) 05:01.0 Ethernet controller: Atheros Communications Inc. AR2413 802.11bg NIC (rev 01) [root@marktop mark]# iwconfig wlan0 wlan0 IEEE 802.11bg ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm RTS thr:off Fragment thr:off Encryption key:off Power Management:off [root@marktop mark]# iwconfig wlan0 essid hrfamnet-101 [root@marktop mark]# iwconfig wlan0 enc XXXXXXXXXX [not really...] [root@marktop mark]# iwconfig wlan0 wlan0 IEEE 802.11bg ESSID:"hrfamnet-101" Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm RTS thr:off Fragment thr:off Encryption key:XXXXXXXXXX Power Management:off [root@marktop mark]# ifup wlan0 Determining IP information for wlan0... failed. [root@marktop mark]# iwlist wlan0 scan wlan0 Scan completed : Cell 01 - Address: 00:1C:F0:58:9A:31 Channel:6 Frequency:2.437 GHz (Channel 6) Quality=47/70 Signal level=-63 dBm Encryption key:on ESSID:"hrfamnet-101" Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s 12 Mb/s; 24 Mb/s; 36 Mb/s Bit Rates:9 Mb/s; 18 Mb/s; 48 Mb/s; 54 Mb/s Mode:Master Extra:tsf=00000073d81085b2 Extra: Last beacon: 468ms ago IE: Unknown: 000C687266616D6E65742D313031 IE: Unknown: 010882848B960C183048 IE: Unknown: 030106 IE: Unknown: 2A0102 IE: Unknown: 32041224606C IE: WPA Version 1 Group Cipher : TKIP Pairwise Ciphers (2) : TKIP CCMP Authentication Suites (1) : PSK IE: Unknown: DD0900037F0101001FFF7F IE: WPA Version 257 Group Cipher : Proprietary Pairwise Ciphers (64) : IE: WPA Version 1 Group Cipher : Proprietary Pairwise Ciphers (22768) : Cell 02 - Address: 00:D0:9E:F6:B3:19 Channel:6 Frequency:2.437 GHz (Channel 6) Quality=39/70 Signal level=-71 dBm Encryption key:on ESSID:"2WIRE067" Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 22 Mb/s Mode:Master Extra:tsf=00000002b79d1987 Extra: Last beacon: 554ms ago IE: Unknown: 00083257495245303637 IE: Unknown: 010582840B162C IE: Unknown: 030106 [root@marktop mark]# What step am I missing that will connect me to the listed access point? I've looked this up in Google, but frankly the mass of information there is either off point (ubuntu, SuSE, etc.) or Windoze or doesn't apply to my NIC or something else. I've spent a whole day on this one and I'm no closer to a/the solution - well, I did get as far as the above. Thanks. Mark

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DomU install failure for Centos 5.5 using the "RHEL 5.4 and greater" OS option
by David Dyer-Bennet 15 Jul '10

15 Jul '10

Had some trouble getting Centos x64 installed as a guest in my new Centos 5.5 x64 server using Xen (thanks again for all the help getting the hardware virtualization turned on and confirmed yesterday!). When I chose OS Linux, and whatever they called the detailed OS subtype I chose the Red Hat Enterprise 5.4 and greater, and then tried to install Centos 5.5, the install started and I got into the graphics installer, but when it was supposed to start installing individual packages the whole virt-manager and console window hung. Three times, at that same point. (I was monitoring web traffic to the install files it was working from, and it wasn't fetching files, either). When I selected just "RHEL 5", it installed (and I'm now running the package updater, and it may have hung there; we'll see). I would have expected the rhel 5.4 and greater option to be the right one for Centos 5.5. Anybody have similar experiences? Or, even more interesting, contrary experiences? -- David Dyer-Bennet, dd-b(a)dd-b.net; http://dd-b.net/ Snapshots: http://dd-b.net/dd-b/SnapshotAlbum/data/ Photos: http://dd-b.net/photography/gallery/ Dragaera: http://dragaera.info

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Redhat Exams.
by Ru-Benz Cáceres 15 Jul '10

15 Jul '10

I want to take the exams of redhat.. I´m starting now.. What advices I can get from you list? _________________________________________________________________ Explore the seven wonders of the world http://search.msn.com/results.aspx?q=7+wonders+world&mkt=en-US&form=QBRE

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Follow Up - Centos / Red Hat EL Broken 5.4 + 5.5, ** Alternative solution **
by Seth Bardash 15 Jul '10

15 Jul '10

To the list: 1) Someone off the list (thanks!) offered to send me an RT kernel based on 2.6.23.X. So I thought why not try to build a standard / server type based on the standard 2.6.23 version. 2) Red Hat 6 Beta 2 is based on a similar starting point 3) I was not going to fix something Red Hat broke. They responded to me that they only support the configuration of the generic binary they ship. This is the answer I received from them for bug # 558367 "Jarod Wilson 2010-07-14 13:40:06 EDT Officially, Red Hat does not support rebuilds of its kernel with configurations other than the one Red Hat ships. You're welcome to submit a patch to fix the build, which will be considered for inclusion, and/or wait for someone here to have the time to work on this, but there are only so many hours in the day. Most of Red Hat engineering is busy working on problems related to configurations that Red Hat *does* support. If this is a particularly serious issue for you though, you're welcome to try to escalate it through customer support. " /Flame proof on This answer brings to light some very serious limitations. First, if you want to turn on a standard kernel feature and its broken (like what I tried), it is not officially supported by Red Hat nor Centos. Therefore, xfs, ntfs, and many other features quite a few of us use may be broken at any time when the upstream provider "fixes or updates" a kernel. /Flame proof off/ I am just stating a warning based on an official answer. NO OPINION OFFERED OR IMPLIED Now for the fix.... No, it was not me that fixed this. I just thought maybe we should try a kernel that has been thoroughly tested by the "kernel people". I used the kernel.org, 2.6.23.17 kernel I used the old .config from the latest Centos 5.5 src.rpm Ran make oldconfig I answered most new questions with the default I enabled AMD Opteron, Disabled optimize for size and changed the default CPU frequency governor to performance. I turned off isdn, infiniband, ATM and a few others (we don't use them) I turned on NTFS and with writes (it was broken in 5.2), xfs and jfs then make; make install_modules mkinitrd ; edit grub; reboot This seems to work fine on a standard Centos 5.5 x86_64 install. I am going to run this on a test server for a few weeks and see how well it works. If I see any issues I will report them but so far it works just fine -- Seth Bardash Integrated Solutions and Systems LLC A Metso IT Consultant 719-495-5866 Shop Phone 719-386-0218 Metso Phone 719-337-4779 Cell seth(a)integratedsolutions.org Failure cannot survive knowledge and perseverance!

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error: _IceTransSocketUNIXConnect: Cannot connect to non-local host [hostname]
by ken 15 Jul '10

15 Jul '10

When launching oowriter and other apps, I get this error: _IceTransSocketUNIXConnect: Cannot connect to non-local host myh.dom.tld The app -- oowriter or whatever I happen to be invoking-- starts okay. But this error message tells me something's not right. Curiously, the "hostname" command yields "myhost", but "hostname -f" yields "localhost.localdomain". Doing "ifconfig eth0" specifies the correct IP address for this system. And the listing in /etc/hosts for that IP address does specify myh.dom.tld. -- Find research and analysis on US healthcare, health insurance, and health policy at: <http://healthpolicydaily.blogspot.com/>

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Linux Kernel Physical Interface Limit
by William Warren 15 Jul '10

15 Jul '10

I think it's baloney mainly because i can't find a mention of it anywhere. Is there REALLY a limit on the number of physical network interfaces in the Kernel?

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GPT Partitions >2.2T with Centos 5.5
by Jens Neu 15 Jul '10

15 Jul '10

Dear all, unfortunately I observe drastic drops in read- performance when I connect LUNs >2.2T to our Centos 5.5 Servers. I suspect issues with the GUID Partition Table, since it happens reproducibly only on the LUNs >2.2T and goes back to normal performance when using a LUN <2T with "normal", Legacy MBR partitions. All machines are CentOS 5.5 (and RHEL 5.5) on IBM Blades LS21/LS41, all LUNs via Brocade 4G FC Switches from a SUN 7310 Unified Storage, EXT3 filesystems with standard settings. Any hints? regards Jens

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Unloking gnome keyring on login
by Giulio Troccoli 15 Jul '10

15 Jul '10

I hope someone can help me because I have spent a week on this and still I can't make it to work. I have a CentOS 5.5 server and I am trying to set it up so that upon login the gnome default keyring is unlocked. I don't have a desktop as users will login using ssh only. I have search the forum and google it, and I did find some help. All the articles though said to change /etc/pam.d/gdm (which I think is for the Gnome Desktop Manager). I did it anyway but no joy. I tried changin /etc/pam.d/login, and no joy. I'm becoming a bit desperate. The changes I have done are to add auth optional pam_keyring.so (sometimes with try_first_pass) and session optional pam_keyring.so auto_start (sometimes without auto_start) All the time the gnome-keyring-daemon is not started. But even if I start it at login, with a new /etc/prodile.d/gnome-keyring-daemon.sh script which runs export `/usr/bin/gnome-keyring-daemon`, the keyring is not unlocked at login. Just to let you know, I use the keyring to store passwords for a Subversion repository. The first time, after logging in, I use Subversion I am asked for the password to unlock the keyring. Then everything goes fine, i.e. I'm not ask for the Subversion password. After I sorted this out I need to set the server so that the keyring password is changed automatically when the user changes his login password (I tried alread, changing /etc/pam.d/passwd similarly as I've done above but it's not working) So, please can anyone help me? Thanks Giulio Linedata Limited Registered Office: 85 Gracechurch St., London, EC3V 0AA Registered in England and Wales No 3475006 VAT Reg No 710 3140 03

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free
by Jason Pyeron 14 Jul '10

14 Jul '10

The man page does not say much, but does this mean I have only 396668 used by programs (used-cached)? Or shoul I be reading the 2nd line? [root@ten-212 ~]# free total used free shared buffers cached Mem: 7918844 5478820 2440024 0 111684 5082152 -/+ buffers/cache: 284984 7633860 Swap: 9961464 204 9961260 -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Principal Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is copyright PD Inc, subject to license 20080407P00.

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Discuss July 2010