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couple questions about initrd.img
by Robert P. J. Day 27 Sep '10

27 Sep '10

here's hoping this is on topic. as part of the extra goodies i'm going to give my RHEL/centos basic admin class this week, i'm going to get them to open up the standard initrd.img file and see what's inside. i just did that myself and have a couple simple questions. first, while the cpio archive physically contains a number of basic /dev special files, the top-level "init" script runs "mknod" to create them all, anyway. not a big deal, but is it fair to say that populating the initrd.img with those initial /dev files is redundant since init creates them all, anyway? also, i note that that "init" script appears to call a couple scripts/commands that don't exist in the initrd, such as hotplug and mkblkdevs. again, not a big deal but if i show the students what's in that initrd, chances are someone's going to notice the above and ask about it, so i might as well have an answer. thanks. 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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Re: [CentOS] dev.centos.org backuppc package
by Jason Pyeron 27 Sep '10

27 Sep '10

> -----Original Message----- > From: Jason Pyeron > Sent: Sunday, September 26, 2010 1:02 > To: CentOS mailing list > Subject: dev.centos.org backuppc package > > I have a few updates to fix some bugs. > Do attachments get striped? -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - 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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Configuring BIND to answer to two domain names (four IP addresses)
by Dotan Cohen 26 Sep '10

26 Sep '10

On a CentOS 5 server, I am having a hard time configuring BIND to answer to 4 IP addresses for 2 domain names. Currently, I have four IP addresses, for sake of discussion they are: 1.1.1.1 1.1.1.2 1.1.1.3 1.1.1.4 Additionally, I have two domain names. For sake of discussion: exampleA.com exampleB.com My goal is to have 1.1.1.1 & 1.1.1.2 as the nameservers for exampleA.com, and 1.1.1.3 & 1.1.1.4 as the nameservers for exampleB.com. Apache is running on this machine, and should of course serve pages for the sites. I think that I've got the apache configuration down, but the BIND configuration is eluding me. I've read the following fine manual, but I am still stuck: http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-bind.html Additionally, I have googled for "how to configure bind for multiple domain names" and the like, but I see no mention of the IP addresses configuration. Can I simply configure any IP address that the server answers to as the nameservers? What am I missing? Thank you in advance! -- Dotan Cohen http://gibberish.co.il http://what-is-what.com

8 42

Mock on 5.5 x86_64 failing with Could not find useradd in chroot, maybe the install failed?
by Jason Pyeron 25 Sep '10

25 Sep '10

I am atempting to work with some rpms in the c5-testing repo. When I add: [c5-testing] name=CentOS-5 Testing baseurl=http://dev.centos.org/centos/5/testing/x86_64/ gpgcheck=1 gpgkey=http://dev.centos.org/centos/RPM-GPG-KEY-CentOS-testing to centos-5-x86_64.cfg, saving as centos-5-x86_64-testdev.cfg I get the aformentioned error. Example [mockbuild@localhost ~]$ mock -r centos-5-x86_64-testdev.cfg init init clean prep This may take a while Could not find useradd in chroot, maybe the install failed? ending done -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - 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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ca-bundle.crt expired
by Timothy Murphy 25 Sep '10

25 Sep '10

I notice that the certificate /etc/pki/tls/certs/ca-bundle.crt on my CentOS-5.5 system expired on 7 Jan 2010, although the openssl-0.9.8e-12.el5_4.6 package was updated in March. What is the point of this certificate? -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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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

12 16

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]

3 2

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

1 0

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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