Discuss January 2012

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222 participants
221 discussions

Load Balance between 2 NIC
by Roberto Cantalapiedra 03 Feb '12

03 Feb '12

Hi, I have a server with 2 NIC and 2 different ISP. The idea is configure a Load Balance with these 2 providers. I reviewed: http://lartc.org/lartc.html#LARTC.RPDB.MULTIPLE-LINKS but I would like to know if this is a good method to use with CentOS 6. Thanks in advance!

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confidence in partitioning tool (6.2)
by Larry Martell 02 Feb '12

02 Feb '12

I have a Windows 7 laptop that I want to make dual boot with CentOS 6.2. My plan was to use the Windows Disk Management tool to partition the disk, but I do not have the needed admin rights on the box to use that. Has anyone used the partitioning tool that comes with 6.2 to do this? Can I have some level of confidence that it will not mess things up so that I cannot boot into Windows? if it screws up and makes Windows unbootable that would be a Very Bad Thing. Thanks! -larry

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mod_rails under Apache under Ceontos 6
by Boris Epstein 01 Feb '12

01 Feb '12

Hello listmates, For some reason we don't seem to be able to launch a Ruby-on-rails application ( http://www.redmine.org/ ) on a CentOS 6 machine under Apache. Nor can I find a mod_rails as a separate package for it. Would anyone have any idea what we might be doing wrong? Thanks. Boris.

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timeconfig
by Jerry Geis 01 Feb '12

01 Feb '12

There used to be a timeconfig command in 5.X - doesnt seem present in 6.X yum provides "*/timeconfig" Loaded plugins: fastestmirror, refresh-packagekit Loading mirror speeds from cached hostfile * base: mirror.us.leaseweb.net * extras: mirror.umd.edu * updates: mirror.umd.edu No Matches found Whats the new command to set the timezone? jerry

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GUI login issues over NFS
by Weiner, Michael 01 Feb '12

01 Feb '12

I am at my wits end, googling, trying various things, and nothing seems to really solve my problem, so I thought I would break down and write to the community to see if anyone else has run into the issue and actually solved it. My environment of interest contains a mix of various Fedora and CentOS workstations that all participate in NIS for user authentication which then, upon a successful login, automount an NFS $HOME directory. And here is the rub, I am migrating that NFS back end FROM a Sun X4540 (which has been working flawlessly for the past few years) to an HP X9320 Ibrix system. I replicated my NFS exports from one system to the other, and have tested command line logins over SSH using NIS credentials and that all seems to work quite well. However, whenever a CentOS (or even Fedora for that matter) desktop user tries to log in (either Gnome or KDE) they are unable to successfully log in - and are presented with the nebulous .dmrc error as follows: User's $HOME/.dmrc file is being ignored. This prevents the default session and language from being saved. File should be owned by user and have 644 permissions. User's $HOME directory must be owned by user and not writeable by any other users. Followed promptly by Your session only lasted less than 10 seconds. If you have not logged out yourself this could mean that there is some installation problem or that you may be out of disk space. Try logging in with one of the failsafe sessions to see if you can fix this problem. Now I have, of course, checked the permissions and ownership of the $HOME directory and also the .dmrc file and they are correct - but no matter what I do, this fails. Things I have tried: with NIS turned on, without NIS turned on, using automount, without using automount, using all different kinds of NFS options passed to a local mount of the /ibrix/testing area which I am using to test GUI logins from the local workstation under Gnome or KDE - all to no avail. And of course I have spent countless hours/days googling and have even written to HP for some advice. I am pretty confident that perms/ownerships are correct, but I just cant seem to get anything to work. Has anyone run into a similar problem? Has anyone found a solution? Does anyone have any suggestions that I am not thinking about? I appreciate your time and assistance Michael Weiner =================================== Please consider the environment before printing this e-mail Cleveland Clinic is ranked one of the top hospitals in America by U.S.News & World Report (2010). Visit us online at http://www.clevelandclinic.org for a complete listing of our services, staff and locations. Confidentiality Note: This message is intended for use only by the individual or entity to which it is addressed and may contain information that is privileged, confidential, and exempt from disclosure under applicable law. If the reader of this message is not the intended recipient or the employee or agent responsible for delivering the message to the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please contact the sender immediately and destroy the material in its entirety, whether electronic or hard copy. Thank you.

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Quantum scalar i40 tape partitions
by Xinhuan Zheng 01 Feb '12

01 Feb '12

Hi All, I have a Quantum scalar i40 tape library. I need to configure it to TWO tape partition libraries, e.g., library_a and library_b, so that each library has its own tape drive. Then connect this physical tape library to two different CentOS servers so that each server can see its own media changer and tape drive. I once had a successful configuration on one host but NOT on the other. One host sees the media changer and one tape drive, while the other host only sees the tape drive. After I delete tape partitions and re-create them both servers are totally screwed up. This is CentOS 5.7 kernel 2.6.18-274. On one server: # cat /proc/scsi/scsi Attached devices: Host: scsi0 Channel: 00 Id: 00 Lun: 00 Vendor: HP Model: Ultrium 5-SCSI Rev: Z58Z Type: Sequential-Access ANSI SCSI revision: 06 Host: scsi0 Channel: 00 Id: 00 Lun: 01 Vendor: QUANTUM Model: Scalar i40-i80 Rev: 135G Type: Medium Changer ANSI SCSI revision: 03 # mtx -f /dev/sg0 inquiry mtx: Request Sense: Long Report=yes mtx: Request Sense: Valid Residual=no mtx: Request Sense: Error Code=70 (Current) mtx: Request Sense: Sense Key=Illegal Request mtx: Request Sense: FileMark=no mtx: Request Sense: EOM=no mtx: Request Sense: ILI=no mtx: Request Sense: Additional Sense Code = 25 mtx: Request Sense: Additional Sense Qualifier = 00 mtx: Request Sense: BPV=no mtx: Request Sense: Error in CDB=no mtx: Request Sense: SKSV=no INQUIRY Command Failed # mtx -f /dev/sg1 inquiry mtx: Request Sense: Long Report=yes mtx: Request Sense: Valid Residual=no mtx: Request Sense: Error Code=70 (Current) mtx: Request Sense: Sense Key=Illegal Request mtx: Request Sense: FileMark=no mtx: Request Sense: EOM=no mtx: Request Sense: ILI=no mtx: Request Sense: Additional Sense Code = 25 mtx: Request Sense: Additional Sense Qualifier = 00 mtx: Request Sense: BPV=no mtx: Request Sense: Error in CDB=no mtx: Request Sense: SKSV=no INQUIRY Command Failed On the other server: tape drive (/dev/st0 not even present). Can someone please help? Thanks, - xinhuan

2 1

libz.so.1 => not found
by Dvorkin, Asya 01 Feb '12

01 Feb '12

Hello, We have an older AFS server, which was running Centos 5.5. It hasn't been updated in a while because of the plans to move it to another server, but it never happened. Thus, we've decided to upgrade it to 5.7… I did yum clean all and yum update. Everything ran smoothly and no issues. After the reboot, zlib.so.1 can no longer be found. /usr/lib64/zlib.so.1 is a symbolic link to /lib64/zlib.so.1, but the file does not exist. Because of this, ssh/yum/rpm do not work… I've been googling, but can't find a solid answer. This is a production server and I need to have it up and running as soon as possible… Any ideas? Thank you! Asya

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Re: [CentOS] rsync from rescue boot
by Les Mikesell 31 Jan '12

31 Jan '12

On Tue, Jan 31, 2012 at 1:50 PM, <m.roth(a)5-cent.us> wrote: > <snip> >>> That's odd, try rsync -e 'ssh -v' to get some more details. >>> Also you will want to use some parameters to rsync (like -av or maybe >>> even >>> -z for compression etc). >> >> I'm getting a >> usage: ssh [bunch of ssh options] >> like it is giving the wrong command line to ssh. Or maybe the lack of >> an /etc/ssh/ssh_config in this environment is breaking it, although my >> own ssh commands and connections seem to work. I haven't done the >> chroot into the installed mount since I was planning to overwrite it. > > Any chance that either your system, or the rescued system, are blocking > it, because it doesn't know who your host, or your host doesn't know the > rescued host? > > I'd try chrooting and restarting sshd. No, I'm trying to have rsync make an outbound connection over ssh from the rescue environment and getting what looks like an argument error from ssh. Ssh itself works and I can connect to the same target if I run it directly, and the exact same rsync command lines work from a normal host. Either rsync isn't setting up the remote command right, or ssh isn't allowing it and giving a bad error message. The goal here was basically to clone a running machine into a new VMware image booted into rescue mode. Maybe there's a better way to do that anyway. The source is using RAID1 drives in a layout that the VMware converter won't handle. The tar | tar copy seems to be mostly OK with a little tweaking of fstab, etc. I'm going to give 'ReaR' (from EPEL) a try too - it is supposed to do most of the grunge work for you but you have to intervene manually if you want to change the disk layout. -- Les Mikesell lesmikesell(a)gmail.com

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rsync from rescue boot
by Les Mikesell 31 Jan '12

31 Jan '12

If I boot a 5.7 install disk with 'linux rescue selinux=0', let it start the network and detect the installed system, ssh seems to work, but rsync fails with "rsync: connection unexpectedly closed (0 bytes received so far) [receiver]). Shouldn't it work as long as the underlying ssh connection works? It doesn't prompt for the ssh password and using -essh doesn't change it. -- Les Mikesell lesmikesell(a)gmail.com

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Red Hat extends production lifecycle for EL5/6
by Karanbir Singh 31 Jan '12

31 Jan '12

https://access.redhat.com/support/policy/updates/errata/ This will be of interest to pretty much everyone on the list. "Red Hat offers support throughout four life-cycle phases—called Production 1, 2, and 3, and an Extended Life Phase—for each major release of Red Hat Enterprise Linux. With Red Hat Enterprise Linux 5 and Red Hat Enterprise Linux 6, Red Hat offers 10 years of Production Phase support from the initial product release date or general availability" -- Karanbir Singh +44-207-0999389 | http://www.karan.org/ | twitter.com/kbsingh ICQ: 2522219 | Yahoo IM: z00dax | Gtalk: z00dax GnuPG Key : http://www.karan.org/publickey.asc

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Discuss January 2012