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Kickstart from tagged VLAN?
by Jeff Hefner 09 Jul '10

09 Jul '10

I've searched around but haven't found a definitive answer yet, is it possible to kickstart from a tagged VLAN? I found this bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=431915 But I can't find out how far the vlan support goes. I haven't found anything about it in any kickstart docs. I have two tagged vlans: Vlan 100 - server subnet Vlan 101 - backup subnet From start to finish anaconda needs to pick up a dynamic address from vlan 100. After that the kickstart file specifies the static adress from vlan100 and it's address from the backup subnet. Anyone know if this is currently possible? If so any nod in the right direction would be appreciated Jeff

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difference between stickybit SUID and SGID
by Agnello George 09 Jul '10

09 Jul '10

i had a small query , whant is the difference between stickybit SUID and SGID , is there any proper site where i can get a clear understanding . -- Regards Agnello D'souza

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DNS problem while trying to join windows 7 to samba3x pdc
by Doug Coats 09 Jul '10

09 Jul '10

I am running centos 5.5 using samba3x as a pdc. I migrated to samba3x so that I could join Windows 7 machines to the domain. It is a new setup using a tried and true configuration from a different box. I have used this configuration in the past to joing Windows XP Pro machines. And I havn't found anyting helpful on the error with google. I can ping the server name and the server can ping the windows 7 box. I can access smaba shares on the server but I cannot join the domain. I have applied the reg settings to win7 and when I try to join I get this error. An Active Directory Domain Controller (AD DC) for domain admin could not be contacted. Ensure that the domain name is typed correctly. If the name is correct, click Details for troubleshooting information. The details read: Note: This information is intended for a network administrator. If you are not your network's administrator, notify the administrator that you received this information, which has been recorded in the file C:\Windows\debug\dcdiag.txt. The domain name "admin" might be a NetBIOS domain name. If this is the case, verify that the domain name is properly registered with WINS. If you are certain that the name is not a NetBIOS domain name, then the following information can help you troubleshoot your DNS configuration. The following error occurred when DNS was queried for the service location (SRV) resource record used to locate an Active Directory Domain Controller (AD DC) for domain "admin": The error was: "DNS name does not exist." (error code 0x0000232B RCODE_NAME_ERROR) The query was for the SRV record for _ldap._tcp.dc._msdcs.admin Common causes of this error include the following: - The DNS SRV records required to locate a AD DC for the domain are not registered in DNS. These records are registered with a DNS server automatically when a AD DC is added to a domain. They are updated by the AD DC at set intervals. This computer is configured to use DNS servers with the following IP addresses: 192.168.4.1 - One or more of the following zones do not include delegation to its child zone: admin . (the root zone) I seem to have a DNS problem but I don't even know what it should be doing so that I know where to start to troubleshoot. Thanks for any help! Doug

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mount cannot find system /dev/root
by sync 09 Jul '10

09 Jul '10

Hi, guys: I attempt to compile a kernel on CentOS 5.3 i386 which is installed in the Virtualbox machine, and its kernel version is 2.6.18-128.el5 ,the new kernel version is 2.6.34.1 All make procedure is running ok. I can generate initrd image with no problem too. But, when I try booting this kernel, I get Kernel panic error message like these: mount: could not find filesystem '/dev/root' setuproot: moving /dev failed: No such file or directory setuproot: error mounting /proc: No such file or directory setuproot: error mounting /sys: No such file or directory switchroot: mount failed: No such file or directory Kernel panic - not syncing: Attempted to kill init! I don't know what is going on here!! Thanks if somebody will be able to help me!

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EC2 elastic IP failover
by Andrei 08 Jul '10

08 Jul '10

Hello, I have two EC2 instances and I would like to setup some sort of failover strategy for them. They currently act as load balancers, forwarding layer 7 traffic using haproxy and stunnel to other EC2 instances. One of these load balancers currently has an elastic IP assigned with an A record pointing to it. What I'm trying to achieve is to remap this elastic IP in the eventuality of an instance failure. I know that heartbeat/keepalived/pacemaker/openais can do this without any kind of trouble but these tools don't work in Amazon's cloud due to restrictions imposed on their network (multicast/unicast traffic). One way of doing this would would require a network monitoring system that supports event-based script execution. At this point I'm thinking about writing a wrapper script around 'ec2-associate-address' and upon detecting a failure on instance A, my network monitoring system would simply execute the script on instance B in order to re-associate the elastic IP. Does anyone have a better/more elegant solution to this? Regards, -- Andrei

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Some Mirrors missing 5.5 directory
by Camron W. Fox 08 Jul '10

08 Jul '10

Alle, I've noticed recently that during my nightly mrepo runs, I get failures like this: mirror: Access failed: 404 Not Found (/centos/5.5/updates/i386/RPMS) mrepo: Mirroring failed for http://mirror.centos.org/centos/5.5/updates/i386/RPMS/ with message: Failed with return code: 256 When I checked http://mirror.centos.org/centos, I noticed some mirrors have 5.5 directories and some do not, so depending on which mirror is selected during the run, sometimes I get updates and sometimes I do not. I've only seen this with 5.5, never before. Did I miss something somewhere? I *would* just use release 5 in our mrepo conf files if I didn't need to mount CentOS-$release-$arch-bin-DVD-?of2.iso. I suppose I could hard code the $release in this line, but it just seems sloppy. Best Regards, Camron -- Camron W. Fox Hilo Office High Performance Computing Group Fujitsu Management Services of America, Inc. E-mail: cwfox(a)us.fujitsu.com

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slow down dd - how?
by Jozsi Avadkan 08 Jul '10

08 Jul '10

How can I slow down dd? I don't want to slow down the pc, when generating a big file [~40 GByte]. Does ionice work properly? Thank you for any help! :\

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Re: [CentOS] how to properly change the timezone
by Phil Manuel 08 Jul '10

08 Jul '10

----- Original Message ----- > changed the timezone by copying the correct file to /etc/localtime, > however something keeps changing it back. I'm not sure if this is a yum > update or what. Without installing the graphical tools, how can I > update the timezone in such a way that the /etc/localtime file won't > keep getting clobbered. /usr/bin/system-config-time (from the system-config-date RPM package) It will work in text mode. (Essentially /etc/sysconfig/clock is the config file that also needs updating) _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos The problem with that tool is that it brings in so many graphical dependencies. It would be better if it was on it's own. Phil.

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how to properly change the timezone
by Nataraj 08 Jul '10

08 Jul '10

Hi, I have a Centos 5.5 server with no GUI installed. I have several times changed the timezone by copying the correct file to /etc/localtime, however something keeps changing it back. I'm not sure if this is a yum update or what. Without installing the graphical tools, how can I update the timezone in such a way that the /etc/localtime file won't keep getting clobbered. Thank You, Nataraj

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How current are packages?
by Matthew Valentino 07 Jul '10

07 Jul '10

I'm relatively new to CentOS. I ordered a VPS and requested CentOS 5.5. As I was installing packages, I noticed that some of the versions are pretty old - for example, Postfix is v 2.3 in the repo (and, according to Postfix's website - no longer mainted). Is this a security risk as the current version is 2.7.1? Building and compiling Postfix from source seems to cause additional problems with yum, so I'm not sure what to do other than perhaps switch to something like Fedora. Perhaps there's a third-party repo with updated packages that I haven't found? Thanks, Matt

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