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does having a centos wiki acct grant edit access?
by Robert P. J. Day 25 Sep '10

25 Sep '10

i just registered for a centos wiki account, and was wondering if this gives me edit capability. i'm prepping for the first of a number of RHEL/centos basic admin courses and currently working my way thru the wiki, collecting neat tricks and ideas and, occasionally, i'll stumble over typoes -- some minor, some not so much. for instance, here: http://wiki.centos.org/TipsAndTricks/YumAndRPM#head-61731905d2e34ac343baeef… the command is listed as: yum --disable "*" --enable "rpmforge" list available i'm guessing that should actually be: yum --disablerepo "*" --enablerepo "rpmforge" list available no? but even if i got edit access, i'd still be happier if someone eventually checked out any changes i made to validate them. whatever works best. rday -- ======================================================================== Robert P. J. Day Waterloo, Ontario, CANADA Top-notch, inexpensive online Linux/OSS/kernel courses http://crashcourse.ca Twitter: http://twitter.com/rpjday LinkedIn: http://ca.linkedin.com/in/rpjday ========================================================================

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In the press, once again
by Timo Schoeler 24 Sep '10

24 Sep '10

May be a little bit off topic, but this gave me hard laugh: http://www.theregister.co.uk/2010/09/24/sysadmin_file_tools/ Windows admins use a virtualized CentOS machine to copy files because their own tools are not able to handle copying a bigger amount of data. :) Cheers, Timo

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grep contents of file on remote server
by Tim Dunphy 24 Sep '10

24 Sep '10

Hello, I am attempting to grep the contents of a key file I have SCP'd to a remote server. I am able to cat it: [code] [bluethundr@LBSD2:~]$:ssh root@sum1 cat /root/id_rsa.pub root(a)lcent01.summitnjhome.com's password: ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEApnUSYyrM96qIBZKjwSNYycgeSv/FAKE-KEY-DATA--KEY-DATA-PWReyVuOn9Fb/uH/FAKE-KEY-DATA-+ttLzUELGrfn/n+FAKE-KEY-DATA-/FAKE-KEY-DATA-/FAKE-KEY-DATA-/FAKE-KEY-DATA-== bluethundr(a)lbsd8-2.summitnjhome.com [/code] But I cannot cat / grep it in order to determine if this key is already in the authorized_hosts file of the remote host. [code] [bluethundr@LBSD2:~]$:ssh root@sum1 grep `cat /root/id_rsa.pub` /root/.ssh/id_rsa.pub root(a)lcent01.summitnjhome.com's password: /root/.ssh/id_rsa.pub:ssh-rsa ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEApnUSYyrM96qIBZKjwSNYycgeSv/FAKE-KEY-DATA--KEY-DATA-PWReyVuOn9Fb/uH/FAKE-KEY-DATA-+ttLzUELGrfn/n+FAKE-KEY-DATA-/FAKE-KEY-DATA-/FAKE-KEY-DATA-/FAKE-KEY-DATA-== bluethundr(a)lbsd8-2.summitnjhome.com==: No such file or directory grep: root@bt-laptop: No such file or directory [/code] Ultimately, what I would like to do is script this in order to automate this process: [code] #!/bin/sh HOSTS="sum1 sum2 virt1 virt2 virt3 virt4 virt5 virt6 virt7" SSHDIR=~/.ssh RSYNC=/usr/local/bin/rsync KEYFILE=/home/bluethundr/.ssh/id_rsa.pub CAT='/bin/cat' GREP='/bin/grep' for h in $HOSTS ; do scp $KEYFILE root@$h:~/ if [ $? = 0 ]; then echo ; echo ; echo echo "KEY TRANSFERRED TO $h" else echo "KEY Transfer To $h has FAILED" exit 1 fi ssh root@$h $CAT /root/id_rsa.pub | $GREP -i /root/.ssh/authorized_keys if [ $? = 1 ]; then ssh root@$h $CAT /root/id_rsa.pub >> /root/.ssh/authorized_keys if [ $? = 0 ]; then echo ; echo ; echo echo "KEY APPENDED TO $h Authorized Hosts" else echo "KEY APPEND FAILED" fi exit 1 fi done [/code] This is what results from the above script: [code] [bluethundr@LBSD2:~/bin]$:./key-export.sh root(a)lcent01.summitnjhome.com's password: id_rsa.pub 100% 417 0.4KB/s 00:00 KEY TRANSFERRED TO sum1 ./key-export.sh: /bin/grep: not found root(a)lcent01.summitnjhome.com's password: [/code] And I'm pretty sure I have those variables set correctly in order to execute those commands: [code] [bluethundr@LBSD2:~/bin]$:ssh root@sum1 root(a)lcent01.summitnjhome.com's password: Last login: Fri Sep 24 07:34:02 2010 from 192.168.1.44 ######################################################### # SUMMITNJHOME.COM # # TITLE: LCENT01 BOX # # LOCATION: SUMMIT BASEMENT # # # ######################################################### [root@LCENT01:~]#which grep /bin/grep [root@LCENT01:~]#which cat /bin/cat [/code]

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mcelog
by m.roth＠5-cent.us 24 Sep '10

24 Sep '10

Ok, we've got a new machine that's throwing ECC errors. I've gotten new memory overnighted to me from the manufacturer, and replaced it, oops, not that end of the bank, as their support told me, this end of the bank, as the mobo manual I found online shows (Supermicro). Still throwing errors. Ok, try to get more info.... Last week, I moved /var/log/mcelog to /var/log/mcelog.1, and touched /var/log/mcelog. This week, I tried running mcelog manually, and via /etc/cron.hourly/mcelog, and get *nothing* at all. /var/log/message only screams that there are ECC errors, so I need more data. I've even tried reinstalling mcelog, but no joy. Anyone got any ideas here, how to get it to say something? mark

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performance and interrupts
by Mag Gam 24 Sep '10

24 Sep '10

I am playing around with irqbalance to tune my 8 core system so I came across this page, http://kb.fusionio.com/KB/a65/irqbalance-avoid-overloading-cpu-0-with-inter… Now, lets say I disable irqbalance which will stop my autobalance and I pin all of my interrupts to core 0 and pin eth0 and eth1 to core 1. My application is network and CPU hungry. I am planning to dedicate cpu 3 to 8 for the application using taskset. Is there any draw back to this?

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Re: [CentOS] In the press, once again
by Gabriel Ogunleye 24 Sep '10

24 Sep '10

Thank you *SO* much! I needed some real world evidence to prove that syncing large amounts of data across windows is a PITA! I'm currently doing something so similar! And I use linux to do it, and no one can understand why. That link has been printed, and strategically left on someones desk, with a post-it note sayin - This is why I use linux :) -----Original Message----- From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On Behalf Of Timo Schoeler Sent: 24 September 2010 14:23 To: CentOS mailing list Subject: [CentOS] In the press, once again May be a little bit off topic, but this gave me hard laugh: http://www.theregister.co.uk/2010/09/24/sysadmin_file_tools/ Windows admins use a virtualized CentOS machine to copy files because their own tools are not able to handle copying a bigger amount of data. :) Cheers, Timo _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

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Disabling IPv6 Auto Configuration
by Ryan Wagoner 24 Sep '10

24 Sep '10

I am using stateless auto configuration for most of my clients. For the servers I prefer to manually assign the address. I have defined the IPv6 address in the ifcfg-eth0 file and set IPV6_AUTOCONF=no. However ifconfig shows both the auto configured and manually assigned address. Looking around I found that net.ipv6.conf.default.accept_ra is set to 1 by default. The ifup-ipv6 is setting net.ipv6.conf.eth0.accept_ra to 0 like it should. From what I can tell the auto configuration is happening right before net.ipv6.conf.eth0.accept_ra is set to 0. If I define net.ipv6.conf.default.accept_ra = 0 in sysctl.conf IPV6_AUTOCONF works as expected for both yes and no settings. Has anybody else noticed this behavior? Ryan

1 0

CentOS, Firefox, and Java Plugin
by Glenn Eychaner 23 Sep '10

23 Sep '10

The latest updates to CentOS 5.5 seem to have broken the Java plugin, and have defeated any and all attempts to get it working again. I'm running CentOS 5.5 (32-bit) and Firefox 3.6.9 (installed from the CentOS repository); I've tried BOTH the openJDK plugin available through the Argeo repositories, and installing Java 1.6.0 directly from Sun/Oracle and creating the plugin soft link in /usr/lib/mozilla/plugins. Neither works at all. This was working a while ago, but it broke and I didn't notice. Thanks for any help you can provide, -G. -- Glenn Eychaner (geychaner(a)lco.cl) Telescope Systems Programmer, Las Campanas Observatory

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CentOS-announce Digest, Vol 67, Issue 8
by centos-announce-request＠centos.org 22 Sep '10

22 Sep '10

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CESA-2010:0704 Important CentOS 5 i386 kernel Update (Karanbir Singh) 2. CESA-2010:0704 Important CentOS 5 x86_64 kernel Update (Karanbir Singh) ---------------------------------------------------------------------- Message: 1 Date: Tue, 21 Sep 2010 16:08:22 +0000 From: Karanbir Singh <kbsingh(a)centos.org> Subject: [CentOS-announce] CESA-2010:0704 Important CentOS 5 i386 kernel Update To: centos-announce(a)centos.org Message-ID: <20100921160822.GA18613(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2010:0704 Important Upstream details at : https://rhn.redhat.com/errata/RHSA-2010-0704.html The following updated files have been uploaded and are currently syncing to the mirrors: ( md5sum Filename ) i386: 490b04b04599481c9e0f29cce0db01ca kernel-2.6.18-194.11.4.el5.i686.rpm 870c8452311fec18d1378f526084598f kernel-debug-2.6.18-194.11.4.el5.i686.rpm 6478426b909d19ad36bef2611e124a26 kernel-debug-devel-2.6.18-194.11.4.el5.i686.rpm 4814108deabc9733d227b3957ddeab1f kernel-devel-2.6.18-194.11.4.el5.i686.rpm c23e73b0e05e5ae47eb3c64d332c91cd kernel-doc-2.6.18-194.11.4.el5.noarch.rpm 2ae622d78585b9d5e7adfb8e08d12a89 kernel-headers-2.6.18-194.11.4.el5.i386.rpm 6ac3187ea72473c60398dbd10077f06b kernel-PAE-2.6.18-194.11.4.el5.i686.rpm eaaf7db165c98414c51d0ddb8d907c52 kernel-PAE-devel-2.6.18-194.11.4.el5.i686.rpm 97a34d0ec1fc0ae52528b453a62d233d kernel-xen-2.6.18-194.11.4.el5.i686.rpm 7fb74796e148bf53d27400745c2be20b kernel-xen-devel-2.6.18-194.11.4.el5.i686.rpm Source: 2c07b2738414284dd0478981ad920fcd kernel-2.6.18-194.11.4.el5.src.rpm -- Karanbir Singh CentOS Project { http://www.centos.org/ } irc: z00dax, #centos(a)irc.freenode.net ------------------------------ Message: 2 Date: Tue, 21 Sep 2010 16:08:22 +0000 From: Karanbir Singh <kbsingh(a)centos.org> Subject: [CentOS-announce] CESA-2010:0704 Important CentOS 5 x86_64 kernel Update To: centos-announce(a)centos.org Message-ID: <20100921160822.GA18628(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2010:0704 Important Upstream details at : https://rhn.redhat.com/errata/RHSA-2010-0704.html The following updated files have been uploaded and are currently syncing to the mirrors: ( md5sum Filename ) x86_64: 15b624c3a2dee7d47cd6218cc8f5ef83 kernel-2.6.18-194.11.4.el5.x86_64.rpm f7f94cc91e490d5a70e226d13da59330 kernel-debug-2.6.18-194.11.4.el5.x86_64.rpm b2deb1565bf5abd2f504903f3a976365 kernel-debug-devel-2.6.18-194.11.4.el5.x86_64.rpm fa30323d128c9de7739d02020b0299c0 kernel-devel-2.6.18-194.11.4.el5.x86_64.rpm 24dde92bc2cb56d771d9ef9127158257 kernel-doc-2.6.18-194.11.4.el5.noarch.rpm 8ddf28a4293810b243ddfd03d758cedd kernel-headers-2.6.18-194.11.4.el5.x86_64.rpm 91e811dd2bc5f34773b2697b3b0385af kernel-xen-2.6.18-194.11.4.el5.x86_64.rpm 04333358cc23134fa762c3534744cf93 kernel-xen-devel-2.6.18-194.11.4.el5.x86_64.rpm Source: 2c07b2738414284dd0478981ad920fcd kernel-2.6.18-194.11.4.el5.src.rpm -- Karanbir Singh CentOS Project { http://www.centos.org/ } irc: z00dax, #centos(a)irc.freenode.net ------------------------------ _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org http://lists.centos.org/mailman/listinfo/centos-announce End of CentOS-announce Digest, Vol 67, Issue 8 **********************************************

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exclude mirror
by cornel panceac 22 Sep '10

22 Sep '10

how can i exclude certain mirrors from yum in centos 5? -- Among the maxims on Lord Naoshige's wall, there was this one: "Matters of great concern should be treated lightly." Master Ittei commented, "Matters of small concern should be treated seriously." (Ghost Dog : The Way of The Samurai)

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