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excessive DNS slows httpd
by Mike -- EMAIL IGNORED 04 Aug '09

04 Aug '09

My web server is a CentOS box thus: [root ~]# uname -a Linux mbrc21 2.6.18-92.1.22.el5 #1 SMP Tue Dec 16 12:03:43 EST 2008 i686 athlon i386 GNU/Linux root ~]# rpm -q httpd httpd-2.2.3-22.el5.centos.2 My development and standby is on a Fedora box thus: [root ~]# uname -a Linux mbrc32 2.6.23.17-88.fc7 #1 SMP Thu May 15 00:35:10 EDT 2008 i686 athlon i386 GNU/Linux [root@ ~]# rpm -q httpd httpd-2.2.8-1.fc7 They are close neighbors on my LAN. Now I recently revised my httpd.conf making it somewhat more complex and adding ssl for part of it. Running the same configuration on both boxes, I find that the Fedora box runs rapidly, while the CentOS box is very slow. Examining the situation with WireShark on both boxes I find that in responding to a simple GET, the CentOS box does a sequence of DNS queries to resolve the details of the location of the client IP address, whereas the Fedora box does no such thing. It ts these DNS queries that are causing the slow response. Now if I revert to the old configuration, there is no such problem and WireShark shows that there are no DNS queries. Advice on how to proceed would be much appreciated. Thanks, Mike.

4 5

Split dns issues
by Jason Pyeron 03 Aug '09

03 Aug '09

We have internal DNS servers that will override the A record for selected hosts. Example mail.pdinc.us will have a different internal ip than external. This has always been a fine way to handle it as the zone files are for that specific host, and there have never been subdomains before. Now we want to just override the MX records for pdinc.us without having to merge or manage all the records for every entry/subdoamin in the zone file for pdinc.us. Any ideas/questions? -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - 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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Perl Module Question
by Joseph L. Casale 03 Aug '09

03 Aug '09

To safely make Perl modules from CPAN in Solaris, I used this procedure: mkdir /opt/cpan chmod 777 /opt/cpan chown joe:101 /opt/cpan PERL5LIB=$PERL5LIB:/opt/cpan export PERL5LIB /usr/perl5/bin/perlgcc -MCPAN -e shell Also, ~/.cpan/CPAN/MyConfig.pm specifically had 'makepl_arg' => q[LIB=/opt/cpan PREFIX=/opt/cpan INSTALLMAN3DIR=/opt/cpan/man/man3], Does this make sense in CentOS as well when the modules just aren't available and using cpan2rpm has me chasing my tail endlessly on deps? Thanks! jlc

2 3

Grub fallback problem
by Matthias Blankenhaus 03 Aug '09

03 Aug '09

Hi ! I am posting this again, since I still have the problem and have not been able to resolve this. Please, take a look and comment if you can. Thank you ! I am running CentOS 5 (core pkgs) / x86_64 using grub 0.97 and I am trying to configure a fallback between two partitions on my local disk, each installed with a CentOS image. The idea is to be able to install a new test OS image and fall back in case of a problem to the default image. This is a great grub feature ! Except it does not work for me :( grub.conf: #----------------------------------------------- default saved timeout=5 fallback 1 title NEW OS root (hd0,0) kernel /boot/vmlinuz-new root=/dev/sda1 panic=5 initrd /boot/initrd-new.img savedefault fallback title DEFAULT OS root (hd0,1) kernel /boot/vmlinuz-default root=/dev/sda2 initrd /boot/initrd-default.img savedefault #----------------------------------------------- Grub is installed on /dev/sda1, but not on /dev/sda2. /dev/sda1 is the primary boot partition. Both partitions are formatted with ext3. The problem is that the fallback does not work for me. For instance, if I specify on purpose a wrong root device with the NEW OS, e.g. root=/dev/sda3, then the kernel panics and reboots properly after 5 sec. However, grub then attempts to boot the NEW OS all over again. The same is true when I fully boot NEW OS with the right root device and then panic the kernel on purpose. Now, I have read somewhere that grub requires a default file to get the savedefault feature working. However, I could neither find the 'savedefault' command nor the grub default file under /boot/grub or anywhere else. One more thing, when I choose the boot title manually then grub seems to remember my last choice. In other words, grub is preserving my last choice from a previous boot. Am I doing something wrong ? Do I need to install something in addition to grub 0.97 ? I have done the RTFM / info thing. Your help is much appreciated, Matthias

2 4

Web
by madunix 03 Aug '09

03 Aug '09

I have the following issues on a website, would like to know how would you resolve these issue? 1- CSS is not used efficient. 2- Search engine need to be optimized. 3- Java Scripts are placed between HTML tags. 4- Redirecting homepage through JS code, using client side 5- Web page delay, a lot of objects. 6- Disable listings directories from apache (how) 7- web not compatible with Firefox Thanks -mu

9 12

server mirroring how to
by fabian 03 Aug '09

03 Aug '09

Dear All, I have the following setup which is the heart of our organistion and runs the following for a long time Centos 5.0 server which is used as a Primary Mailserver running sendmail about 400 users mailScanner Primary DNS server using bind Webserver running apache squirrel mail web server i also do have a another centos secondary DNS server and same machine used as my secondary mail server with no mail users Currently i have been following a little crude way of backup i shut down the Primary machine and I use clone Gozilla to make a duplicate of the original disk and keep it standby i do it weekly basis which is really a crude way i am jus googling arround for a solution in where i could have online mirroring of another machine i could have an identical hardware machine which could be running online so if the first machine fails the second one is avaliable instantly also if i create a new user or a new mail user ther user is replicated on both machine if i upgraded or install any software on one machine it is replicated on the other automaticalu.. so we have total redundancy can it be done i was googling arround and actually found linux heartbeat but could not really get the hang of it. to my understanding heartbeat works on service which one would like to mirror but for me i would like disk mirroring on different servers any body has done the above apprecite your advice and help regards fabian -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

4 3

Weird permission
by muhammad panji 03 Aug '09

03 Aug '09

Dear all, I got weird permission on one of my server, when I ls -l the / i got permission for all directory set to "drwxr-xr-x." there are dot after the executable permission for others. what dot mean in permission and how to fix it? the actual problem is I could login via ssh but cannot login via winscp. any idea how to fix this? thanks in advance best regards, -- Muhammad Panji http://sumodirjo.wordpress.com http://www.kurungsiku.web.id

5 6

State of KVM and CentOS
by Johan Swensson 03 Aug '09

03 Aug '09

Hi I was wondering, what is the state on getting a more updated version of KVM onto centos? I've found some 3rd party repos by I'm curious if one could expect a new supported KVM soon or will it not get in until EL6?

4 3

PDNS
by Jason Pyeron 03 Aug '09

03 Aug '09

Does anyone have experience with PDNS? The reason I ask is that I have never heard of it before today, but it looks like we might want to leverage its sql backend capabilites. My (useless) searches lead me to: * http://lists.centos.org/pipermail/centos-es/2009-February/004499.html * http://lists.centos.org/pipermail/centos/2009-July/078975.html (in spanish...) * http://www.tummy.com/journals/entries/kevin_20070326_163156 * http://mailman.powerdns.com/pipermail/pdns-users/2005-November/002829.html * http://www.linuxquestions.org/questions/solaris-opensolaris-20/powerdns-vs-… 636478/ (same dilemma as mine) In particular do you have any complaints about doing complicated setups? Windows machines registering themselves? Upstream provider's continued support after 5.x? Any other jibes or cheers? -Jason -- -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - 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.

3 2

CentOS on Acer Laptop
by sam R 03 Aug '09

03 Aug '09

I have very basic question: I have downloaded *CentOS-5.3-i386-LiveCD* from CentOS website. Now I need to install it on my Acer Laptop permanently not as a liveCD. How do I burn it to a DVD to be able to install it by simply restarting my laptop? Thank you, Sam

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