Discuss July 2010

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by mj 09 Jul '10

09 Jul '10

My log seems not to be accepted by the list

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OT: ?? Centos Still Broken, Red Hat won't fix ??
by Seth Bardash 09 Jul '10

09 Jul '10

To the Linux Community at Large: I reported to this list back in January, 2010 that the standard x86_64 kernel, when built from the src.rpm and modified for AMD K8 / K10 Extensions would not build. I reported this here and to Red Hat via Bugzilla ID number 558367. RH AS / Centos 5.3 worked fine. That was Centos 5.4 / Red Hat Enterprise AS 5 Update 4. Today we tried to optimize Red Hat Enterprise AS 5 Update 5. Same problem. At last check all kernels from 2.6.18-10 to 2.6.18-194 won't build with AMD specific optimizations. For 9 years now we have used and supported Centos and before that white box. We have sold, installed and provided consulting on Red Hat Linux and RH Enterprise Linux, Centos, Scientific Linux, OpenSUSE and SUSE Linux Enterprise. In April this year, the bug was still marked as new and we had to recommend to a customer to use SUSE Linux Enterprise instead of Red Hat Enterprise, as Novell's product supports optimizations in its kernel for AMD Opterons. 12 SLES Enterprise copies were sold to the customer. I'm sure that would have easily paid for the fix required in Redhat's kernel. I am beginning to wonder if Red Hat is getting too big? Or that it just does not care. Other ideas less pleasant come to mind.... Today, the old bug was still marked as new (6+ months and counting). I entered a new bug report for RH 5.5 for the same issue. Is there no way, unless you are a huge customer, to get your bug listed as anything except LOW PRIORITY?? Now we are looking at the AMD G34 CPU's and are building some demo units. I think its time to benchmark these systems with the working - non optimized Red Hat / Centos Linux versus the optimized Opensuse / SLES Linux for standard server functions and publish them. Has anyone else had this NON response from Red Hat for similar issues? I'd like to hear from them. Thanks for reading.... -- Seth Bardash Integrated Solutions and Systems LLC 719-495-5866 Shop Phone 719-337-4779 Cell seth(a)integratedsolutions.org Failure cannot survive knowledge and perseverance!

8 11

Configuring atrpms repo?
by Jeff Layton 09 Jul '10

09 Jul '10

Afternoon, Sorry for being dense but I can seem to configure the repo for atrpms correctly. I've tried a few things and none of them seem to work so rather than embarrass myself in regard to yum repo configuration, can someone post the repo configuration? TIA! Jeff

2 3

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

7 8

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

3 2

DNS problem while trying to join windows 7 to samba3x pdc
by Doug Coats 08 Jul '10

08 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

8 45

mount cannot find system /dev/root
by sync 08 Jul '10

08 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!

2 2

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

1 0

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

1 0

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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Discuss July 2010