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Strange XEN on CentOS HWaddr Address Issue
by Brett Serkez 04 Aug '09

04 Aug '09

Ran into a strange issue with XEN on CentOS that I think is specific to CentOS, which is why I'm starting by posting to this list first, I'll post on the XEN list depending on responses. My sense is this issue has something to do with how CentOS handles network setup on first boot of the XEN kernel. - Installed a brand new CentOS 5.3 server with minimal packages. - Installed XEN, modified grub.conf to boot off of the XEN kernel and rebooted. - After reboot, network connectivity was lost. - Investigation concluded the issue was that the HWaddr address of the physical NIC matched the fabricated HWaddr that XEN uses for most of its adapters: FE:FF:FF:FF:FF:FF. - Temporary resolution, I re-enabled the motherboard's NIC, rebooted, all seems to be working. I would like to get the NIC in question working as it is a GigaBit NIC, but it still has the HWaddr: FE:FF:FF:FF:FF:FF which conflicts with XEN. My understanding of the HWaddr is that the first portion is manufacturer assigned for uniqueness, I cannot image this NIC originally had this HWaddr, but I don't know what it originally was. Does anyone know if this value is read from the NIC on each boot, or is it stored in a file after the first boot? Is there someway to undo this change so the NIC returns to its original value or atleast a non-conflicting value? Has anyone else seen this behavior? Thank you in advance, Brett

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firewall setup for nfs
by Jerry Geis 04 Aug '09

04 Aug '09

Below is my firewall rules for iptables. everything is working fine except for NFS I cannot mount my drive. If I turn off iptables I can mount. Looking at this : http://www.centos.org/docs/5/html/Deployment_Guide-en-US/ch-nfs.html Important In order for NFS to work with a default installation of Red Hat Enterprise Linux with a firewall enabled, IPTables with the default TCP port 2049 must be configured. Without proper IPTables configuration, NFS does not function properly. The NFS initialization script and rpc.nfsd process now allow binding to any specified port during system start up. However, this can be error prone if the port is unavailable or conflicts with another daemon. I have port 2049 listed in my iptables. Is there a reason I cannot mount? thanks, Jerry ------------------------------ # Firewall configuration written by system-config-securitylevel # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :RH-Firewall-1-INPUT - [0:0] -A INPUT -j RH-Firewall-1-INPUT -A FORWARD -j RH-Firewall-1-INPUT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -i lo -j ACCEPT -A RH-Firewall-1-INPUT -p icmp --icmp-type any -j ACCEPT -A RH-Firewall-1-INPUT -p 50 -j ACCEPT -A RH-Firewall-1-INPUT -p 51 -j ACCEPT -A RH-Firewall-1-INPUT -p udp --dport 5353 -d 224.0.0.251 -j ACCEPT -A RH-Firewall-1-INPUT -p udp -m udp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -p tcp -m tcp --dport 631 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 2049 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 2049 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 69 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 69 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 6540 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 6500 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 6510 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 6520 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 5060 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 5036 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 4569 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 1720 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 4520 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 443 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 123 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 53 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5900 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 5900 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 2000 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 2000 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m udp -p udp --dport 5353 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 5353 -j ACCEPT -A RH-Firewall-1-INPUT -m state --state NEW -m tcp -p tcp --dport 6544 -j ACCEPT -A RH-Firewall-1-INPUT -j REJECT --reject-with icmp-host-prohibited

4 4

CentOS village @ HAR
by Didi 04 Aug '09

04 Aug '09

Hey I am just organizing the CentOS village at HAR and need a rough estimate of people who will be attending. What do people want? Shall the CentOS people have their own party tent? We are currently with the Fedora people. I will also post on the SL mailing list. Hope to see you all at HAR? Cheers Didi ---- My www page: www.ribalba.de Email / Jabber: ribalba(a)gmail.com Skype : ribalba

3 2

Yum - which repo did a package come from
by Linux Advocate 04 Aug '09

04 Aug '09

guys, i have installed mailscanner, spamassassin, etc on my machine. This was done sometime ago. Some of these rpms i got not frm centos repos. What command ( or yum command ) can i use to find out which repo did this installled package come from. yum info packagename just says; repo : installed i was hoping for something like repo:rpmforge or something similiar. i have these 3 rpms which i cant remember where i got them from. dovecot-1.0.7-7.el5 mailscanner-4.74.13-2 spamassassin-3.2.5-1.el5 Regards, Marco.

4 6

help - batch account creation
by David Leon 04 Aug '09

04 Aug '09

Hello guys I have a new Centos 5.3 running, and I have a text file with a bunch of accounts (more than 100) that I should create . File format is like this user1 pasword1 user2 passwrd2 .... How can I do this task easier than creating user one by one by hand? Need some help for building an script to achieve this task Thanks David

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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

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