February 2011 - Discuss - lists.centos.org

Strange Kernel for Centos 5.5
by Always Learning 13 Feb '11

13 Feb '11

One of my VPS stopped working. After the data centre replaced a disk normal service resumed, then I notices this: CentOS release 5.5 (Final) Kernel 2.6.35.4 on an x86_64 I always thought Centos 5.x would always be on 2.6.18. Any thoughts?

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Re: [CentOS] CentOS Digest, Vol 73, Issue 12
by Chuck Munro 12 Feb '11

12 Feb '11

On 02/12/2011 09:00 AM, Gerhard Schneider wrote: > > Sorry, I don't use CentOS 6 now so I cannot check, but: > > Could it be that RHEL6 changed the default superblock mdadm is creating? > CentOS 5 is creating a 0.9 superblock. Some "other OS" are creating 1.2 > per default. But you can change that on the command line. > > If that's the case it's not a bug but a feature.. > > GS > > -- Gerhard Schneider Institute of Lightweight Design and e-Mail: > gs(a)ilsb.tuwien.ac.at Structural Biomechanics (E317) Tel.: +43 664 60 588 > 3171 Vienna University of Technology / Austria Fax: +43 1 58801 31799 > A-1040 Wien, Gusshausstrasse 27-29 http://www.ilsb.tuwien.ac.at/~gs/ Bingo! That hadn't occurred to me. And 1.2 is specified in the mdadm.conf file, which went right over my head. :-( Thanks Gerhard; mystery solved. Now all I need to do is wait for CentOS-6 to see if it correctly assembles all members of the arrays at boot time. I suspect the evaluation copy of RHEL-6 is not really up to date, so there may be issues with mdadm. I did take a look around the RedHat bugzilla site and saw a couple of things that might be related to the problem. Chuck

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Samba or NFS
by Alfredo Perez 12 Feb '11

12 Feb '11

Hello Thinking of setup a backup process between two Centos systems. One will backup to the other one. For those people out there with Centos production severs what would you recommend to use Samba or NFS What is the most common and simple to use? Many thanks in advance Alfredo

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Re: [CentOS] Some RAID-6 observations ... RHEL-6 vs CentOS-5.5
by Gerhard Schneider 11 Feb '11

11 Feb '11

Sorry, I don't use CentOS 6 now so I cannot check, but: Could it be that RHEL6 changed the default superblock mdadm is creating? CentOS 5 is creating a 0.9 superblock. Some "other OS" are creating 1.2 per default. But you can change that on the command line. If that's the case it's not a bug but a feature.. GS -- Gerhard Schneider Institute of Lightweight Design and e-Mail: gs(a)ilsb.tuwien.ac.at Structural Biomechanics (E317) Tel.: +43 664 60 588 3171 Vienna University of Technology / Austria Fax: +43 1 58801 31799 A-1040 Wien, Gusshausstrasse 27-29 http://www.ilsb.tuwien.ac.at/~gs/

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Will Rogers: Kai Schaetzl may be ignorant about kill files (was: how will CentOS handle the perftools 1.7 vs. 1.6 issue?)
by Larry Vaden 11 Feb '11

11 Feb '11

On Thu, Feb 10, 2011 at 11:31 AM, Kai Schaetzl <maillists(a)conactive.com> wrote: > > This wasn't the first instance. This guy has recently started a habit of > copying mails (that are not his own it seems) that trip him off right to > this list. That is bad practice. I do not want to get more of this. > > Kai Kai, as you may not already know, Will Rogers said "Everybody is ignorant, only on different subjects." e.g., I expressed my ignorance about just how far the binary compatibility with RedHat extended within the CentOS community and have learned from the questions posed. I think it fair to say the objective of binary compatibility has greater weight with CentOS folks than completeness and correctness, but that's JMHO and like Dennis Miller, I could be wrong about that. As Will's fellow OKie, if you don't already know about kill files, I'll help Will do posthumously what he might have done if he were alive today reading this CentOS list, namely refer you to <http://en.wikipedia.org/wiki/Kill_file>. I am somewhat saddened that Browning's "“Ah, but a man's reach should exceed his grasp, or what's a heaven for?” doesn't seem enough to cause sufficient interest in an auxiliary repo consisting exclusively of current release intrinsic functions like BIND, DHCP, et al. Perhaps the most encouraging remark came from Karanbir, namely: On Wed, Feb 2, 2011 at 12:10 PM, Karanbir Singh <mail-lists(a)karan.org> wrote: > > [1]: I say that with a pinch of salt though - EL6 is a tad overdue. A > lot of new projects and services need a codebase newer than whats on > offer in C5. kind regards/ldv

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how will CentOS handle the perftools 1.7 vs. 1.6 issue?
by Larry Vaden 11 Feb '11

11 Feb '11

In order to avoid a cross post, the following background quote is from SCIENTIFIC-LINUX-USERS(a)fnal.gov: <quote> On Wed, Feb 9, 2011 at 11:27 AM, Ewan Mac Mahon <ewan(a)macmahon.me.uk> wrote: > > I'm a little bit hazy on the details, but there are some slides from the > meeting here[1]: > http://indico.cern.ch/getFile.py/access?contribId=8&sessionId=1&resId=1&mat… On Wed, Feb 9, 2011 at 12:41 PM, Chris Jones <christopher.rob.jones(a)cern.ch> wrote: > > I would say a bug in tcmalloc, not SL or RHEL. See for instance > > <http://code.google.com/p/google-perftools/issues/detail?id=305> > > The fix is to move to google perftools 1.7 </quote> Because of a problem with not running the current BIND release a couple of weeks ago, I would like to ask: a) is RedHat likely to choose to backport the fix to 1.6 or will it adopt 1.7 or leave as is until 5.7 or later as it has done with BIND? b) will Centos and/or SL follow RH exactly or will their approaches differ? IOW, how far does the "binary compatiblity" policy extend? kind regards/ldv

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Hyper-V template configuration
by Dvorkin, Asya 11 Feb '11

11 Feb '11

Hi everyone, I've installed CentOS 5 on Hyper-V and finally got everything working. I would like to setup a template, but google is failing me. Everything I read does not seem very promising when it comes to templates support with MS Hyper-V. I was wondering if maybe someone here has successfully configured CentOS templates? I realize that VmWare is a lot better, but it's not a matter of choice at this point. Thank you! Asya

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Centos 5.5 + firefox 3.6 and 64bit javaplugin (1.6u23)
by Eero Volotinen 11 Feb '11

11 Feb '11

Hi List, Any success running 64bit javaplugin on centos 5.5 & firefox 3.6? For me it always complains about wrong elfclass64 ? thanks for any help.. -- Eero

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Some RAID-6 observations ... RHEL-6 vs CentOS-5.5
by Chuck Munro 10 Feb '11

10 Feb '11

Hello all, In the process of building a new VM box to replace several individual CentOS servers, I've had the "interesting" experience of running both CentOS-5.5 and RHEL-6 (eval copy) as I build out the hardware based on a Supermicro motherboard. A couple of observations regarding RAID-6: - RAID-6 arrays created on RHEL-6 don't seem backward compatible with CentOS-5.5. This may or may not be expected behaviour, but it makes me wonder if forward compatibility might be a problem for those of us migrating large RAID-6 arrays from CentOS-5 to -6 systems. The main observations are that the md superblock is declared bad, and I get those boot-time messages claiming the available blocks are less than the configured size. As a result, the RAID arrays are not made available on CentOS-5.5. - A total of 8 RAID-6 arrays in RHEL-6 are built with 2TB data disks plus a hot spare. However, every time I boot the system some, but not all, of the hot spare partitions are randomly missing. Using mdadm to manually add the spare partition back into an array always works. There are 4 array partitions per disk, and the largest single array is just over 2 TBytes of useable space. There are two groups of 5+1 drives spread across two SAS/SATA controller cards, and this random behaviour can occur on either one. Rebooting gets me a different set of missing hot spare partitions. The only error messages I get are the mdmonitor "missing spares event" emails ... nothing in dmesg. The host OS has its own RAID-1 (+ hot spare) arrays on a separate set of disks and controller, and those arrays always come up correctly. I've checked and double ckecked the mdadm.conf file to make sure the ARRAY, DEVICE and 'devices=....' statements are correct. Using mdadm to shut down an array and then reassemble it always seems to work properly, but something random is happening at boot-time assembly. It's only the hot spare partitions that don't appear, never the data partitions. Weird. I'm hoping CentOS-6 doesn't present me with the same problem. Because I'm not a registered RHEL user, I don't have the ability to submit a bug report at RedHat. Chuck

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dhcp fail over
by aurfalien＠gmail.com 10 Feb '11

10 Feb '11

Hi all, Few questions. Does DHCP failover work with statically assigned nodes? Seems like the failover statements only work in shared networks with non bootp clients? I'm assuming Centos 6 will have DHCP v4.2? Currently 5.5 ships with v3.0.5b. And will DHCP v4.X have easier failover implementation? Thanks in advance, - aurf

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High Availability and Storage Cluster
by Denis Zaharov 10 Feb '11

10 Feb '11

Dear mailing list members, There was a branch about clusters, but I have a certain task. There are two servers with CentOS 5.5 installed. The servers are working with Zabbix (monitoring system for traffic, using a MySQL), wiki and RT (all are using Apache). If one server will have became not available then necessary start these services on another server with replication of data. Can I use the Red Hat Cluster Suite for it at CentOS? Also I heard about Heartbeat and DRBD. Maybe it is what I need? -- Kind regards, Denis Zaharov

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PAE kernel source code
by sri 10 Feb '11

10 Feb '11

Hi I want to use 2.6.18-194.el5-PAE kernel source code. Unable to find it over web. Appreciate any pointers for that. Thanks, Sri -- --

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ipsec with ipv4 and ipv6 not working
by Steve Clark 10 Feb '11

10 Feb '11

Hello, How do I find out what is happening to my packets thru my ipsec tunnel. They just seem to disappear on the remote side. I have successfully got the pings thru when everything has an ipv6 address, but am not successful when trying to connect two ipv4 lans across an ipv6 ipsec tunnel. All fw chains both 4 and 6 are set to ACCEPT. NAT is turned off. eth0 eth1 eth1 eth0 10.1.254.254/17 2001:xxxx:1628::254 <----ipv6 internet -----> 2001:xxxx:e334::254 10.0.254.254/17 12:00:02.296972 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28b), length 132 12:00:03.308751 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28c), length 132 12:00:04.296857 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28d), length 132 12:00:05.293748 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28e), length 132 12:00:06.296623 IP6 2001:xxxx:1628::254 > 2001:xxxx:e334::254: ESP(spi=0x07454bc3,seq=0x28f), length 132 I have posted to the ipsec-devel list and haven't gotten any responses. Also I have spent 2 days googling with no results about the above setup. Is it even possible to tunnel ipv4 packet thru an ipv6 ipsec tunnel? Thanks, Steve -- "They that give up essential liberty to obtain temporary safety, deserve neither liberty nor safety." (Ben Franklin) "The course of history shows that as a government grows, liberty decreases." (Thomas Jefferson)

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VPN inside VPN?
by Fajar Priyanto 10 Feb '11

10 Feb '11

Hi all, Just wondering if VPN inside VPN is possible? I've created PPTP VPN in the office. Then from home, first I need to use company's official AT&T VPN. Then after connected, I fire up the PPTP VPN client. Got connected, but cannot ping the PPTP gateway, and half minute later the PPTP got disconnected. No obvious error message in the PPTP log. Thank you.

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Re: [CentOS] Ken Olsen od DEC, 1927-2011
by Les Bell 09 Feb '11

09 Feb '11

Raymond Lillard <ryl(a)sonic.net> wrote: >> The statement is generally quoted without context as it is here. << Correct. Olsen is also famous for saying "People will get tired of managing personal computers and will want instead terminals, maybe with windows." (by which he meant, a windowing graphical terminal, a la X). He was right about that; witness the popular disenchantment with MS Windows and its endless cycle of patching, upgrades, malware removal and registry cleanup, and the fascination with cloud services accessed by lightweight clients like netbooks, tablets and phones. That's been good for the Linux and Centos communities, who have provided low-maintenance services for clients both on the desktop and in the cloud. I venture to say that DEC was an influence on many of the old hands here and on other lists. The PDP-8 was the first computer I actually got my hands on (as opposed to being walked through the machine room and told "Don't touch anything! This is where your code gets compiled and run - careful with the card deck on top of that tape drive behind you!"). And later, I found myself teaching business students to program on a PDP-11/70 running RSTS/E. DEC was certainly heavily influential in our industry, both directly and indirectly, and Olsen was - of course - hugely influential on DEC. Best, --- Les Bell [http://www.lesbell.com.au] Tel: +61 2 9451 1144

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a possible heads up wrt CERN experiment breaking SL 5.6
by Larry Vaden 09 Feb '11

09 Feb '11

This may or may not be of interest to CentOS developers; if it is not or if it is redundant of your efforts to keep atop of what's happening, you have my apologies. Whether it is joint or disjoint wrt to the upstream code is not known at this point, but I have submitted a request for elucidation if CERN security allows. kind regards/ldv ---------- Forwarded message ---------- From: Ewan Mac Mahon <ewan(a)macmahon.me.uk> Date: Wed, Feb 9, 2011 at 10:11 AM Subject: SL 5.6 released? To: SCIENTIFIC-LINUX-USERS(a)fnal.gov Hi, As far as I'm aware SL 5.6 isn't out yet - I don't think I've seen a release announcement, it's not on ftp.scientificlinux.org, and the web site front page lists 5.5 as the latest, and SL 6 was being considered a higher priority. However, someone from CERN IT (discussing some experiment software which seems to break on 5.6) has just told a grid deployment meeting that: "FNAL released SL 5.6 last week" Clearly either my understanding is flawed or his is; which is it please? Ewan

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mount the wrong device after system recovery
by Xinhuan Zheng 09 Feb '11

09 Feb '11

Hi, I am recovering a CentOS 5.4 system. I've copied all partitions into the recovery system. I've installed grub boot loader. However, the original system is using /dev/sdb1 for root (/), while the recovery system is using LVM (/dev/vg0/lv1) for root (/). When recovery system boots, I got the panic error: * Mounting /dev/sdb1 on /sysroot * Mount: mounting /dev/sdb1 on /sysroot failed: No such file or directory * Mount: mounting /dev on /sysroot/dev failed: No such file or directory * * switching / to /sysroot * Switch_root: bad newroot /sysroot * Kernel panic - not syncing: Attempted to kill init! I've changed the recovery system fstab to use the correct devices. I deleted recovery system etc/lvm/cache/.cache file. But it still doesn't work. What am I missing? Thanks, - xinhuan

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iptables nat table rules
by Carlos S 09 Feb '11

09 Feb '11

I am forwarding traffic on port 8080 to port 80 with following rule. # iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 8080 -j REDIRECT --to-port 80 # iptables-save However, I am unable to add it directly in /etc/sysconfig/iptables. I think it is used only for filter table and not nat table. So where do nat table rules go? Any help? - cs.

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iSCSI disk preperation
by Jason Brown 09 Feb '11

09 Feb '11

I am currently going through the process of installing/configuring an iSCSI target and cannot find a good write up on how to prepare the disks on the server. I would like to mirror the two disks and present them to the client. Mirroring isn't the question, its how I go about it is the problem. When I partitioned the two drives and mirrored them together, then presented them to the client, it showed to the client as a disk out no partion on it. Should I partition the drive again and then lay the file system down on top of that? Or should I delete the partitions on the target server and just have sda and sdb mirrored, then when the client attaches the disk, then partion it (/dev/sdc1) and write the file system. Thanks

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rsync permission denied , without changing apache user and group setting
by Agnello George 09 Feb '11

09 Feb '11

Hi i got two server webserver1 and webserver2 i want to rsync some data form webserver1 to webserver2 using a user called syncuser ( syncuser is added to the group apache : adduser -G apache syncuser ) here is my command : [root@web1 projects]# rsync -avzh /var/www/projects/beta-website1 syncuser@web2server:/var/www/projects syncuser@web2server password: building file list ... done beta-website1 rsync: failed to set times on "/var/www/projects/beta-website1": Operation not permitted (1) beta-website1/index.html rsync: mkstemp "/var/www/projects/beta-website1/.index.html.ZW9de8" failed: Permission denied (13) rsync: failed to set times on "/var/www/projects/beta-website1": Operation not permitted (1) sent 219 bytes received 54 bytes 60.67 bytes/sec total size is 57 speedup is 0.21 rsync error: some files could not be transferred (code 23) at main.c(892) [sender=2.6.8] on webserver2 my permission are as follows ( i dont not want to change the permissions, i want user and group to be apache ) [root@web6 projects]# ll total 20 drwxr-xr-x 2 apache apache 4096 Feb 7 15:54 beta-website1 Can some one help me understand how to sync thses files . -- Regards Agnello D'souza

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Printer-Problems
by Timothy Kesten 09 Feb '11

09 Feb '11

Hi Folks, fresh CentOS 5.5 x86_64. One USB-printer connected (HP Business Inkjet 1200) Printing from localhost:631 (Testpage) works. But no from any application. From OO only the message: printer-problem - no more. Second printer is from far (Cupsd) in the network. Works well. But what's about the local printer? Any hints? Thx Timothy

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Re: [CentOS] Fan speed control on Supermicro X8DAL board with CentOS
by Chuck Munro 09 Feb '11

09 Feb '11

On 02/07/11 20:42, RedShift wrote: > > Actually it's possible a hardware monitoring module is interfering with the FAN speed control duties. Try preventing any hardware monitoring related modules get modprobed. See modprobe.conf how to blacklist modules. > > > Glenn Interesting thought Glenn, thanks. I've since gone back to CentOS-5.5 on the box (since it's not fully built anyway) and added the SuperoDoctor monitoring utility after resolving a couple of dependencies like SNMP and the correct kernel driver. I sent an enquiry to the Supermicro support folks, and they jumped on it right away, which impressed me. They wanted a screenshot of SuperoDoctor to try to analyze the problem. I don't think it's a case of a kernel module getting in the way because this issue crops up even during the BIOS boot process, and happens randomly if I run memtest86 as well. Sometimes the fans jump to light speed, other times not. I'm beginning to think it's either a bug in the latest BIOS or a sensor chip problem. Even when the CPU temperatures are reported as "Low", the fans run full speed most of the time. The exhaust air leaving the box is almost cool, so ambient temperature is ok. I'll give the Supermicro support folks some time to sort this out, since I'm still waiting for CentOS-6 anyway. Chuck

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Ken Olsen od DEC, 1927-2011
by m.roth＠5-cent.us 09 Feb '11

09 Feb '11

A lot of us wouldn't be here without him. DEC made good, really reliable hardware. mark <http://www.networkworld.com/news/2011/020711-kenneth-olsen-dec-obit.html>

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yum is b0rked
by Tim Dunphy 08 Feb '11

08 Feb '11

hello centos.. my yum is b0rked... [root@VIRTCENT03:~] #yum repolist Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile Traceback (most recent call last): File "/usr/bin/yum", line 29, in ? yummain.user_main(sys.argv[1:], exit_code=True) File "/usr/share/yum-cli/yummain.py", line 309, in user_main errcode = main(args) File "/usr/share/yum-cli/yummain.py", line 178, in main result, resultmsgs = base.doCommands() File "/usr/share/yum-cli/cli.py", line 349, in doCommands return self.yum_cli_commands[self.basecmd].doCommand(self, self.basecmd, self.extcmds) File "/usr/share/yum-cli/yumcommands.py", line 781, in doCommand base.repos.populateSack() File "/usr/lib/python2.4/site-packages/yum/repos.py", line 232, in populateSack self.doSetup() File "/usr/lib/python2.4/site-packages/yum/repos.py", line 79, in doSetup self.ayum.plugins.run('postreposetup') File "/usr/lib/python2.4/site-packages/yum/plugins.py", line 179, in run func(conduitcls(self, self.base, conf, **kwargs)) File "/usr/lib/yum-plugins/fastestmirror.py", line 164, in postreposetup_hook read_timedhosts() File "/usr/lib/yum-plugins/fastestmirror.py", line 233, in read_timedhosts host, time = line.split() ValueError: too many values to unpack rm -rf /var/lib/rpm/*_db.* I have tried rm -rf rm -rf /var/lib/rpm/*_db.* and rebuilt my rpm package database but that didn't move the needle on this problem And here is the contents of timedhosts.txt [root@VIRTCENT03:~] #cat /var/cache/yum/timedhosts.txt <?xml version="1.0" encoding="UTF-8"?> <repomd xmlns="http://linux.duke.edu/metadata/repo"> <data type="other_db"> <location href="repodata/other.sqlite.bz2"/> <checksum type="sha">952fa417bd3a2d464ac1e4b0a324019a9e0d6827</checksum> <timestamp>1297028257</timestamp> <open-checksum type="sha">dac0d202c11a546909943ed2f8722f29b3183a31</open-che cksum> <database_version>10</database_version> </data> <data type="other"> <location href="repodata/other.xml.gz"/> <checksum type="sha">5993a19c31dbd33c125efe3a1355eee2bf6456ab</checksum> <timestamp>1297028256</timestamp> <open-checksum type="sha">0c9f4d594d743233b2b955102b254d0a960a3824</open-che cksum> </data> <data type="filelists_db"> <location href="repodata/filelists.sqlite.bz2"/> <checksum type="sha">5c9ff9f0ffa1b528040054940366e1a1f2e7f330</checksum> <timestamp>1297028257</timestamp> <open-checksum type="sha">427720aeb56f0b481accf6679925784214cb941a</open-che cksum> <database_version>10</database_version> </data> <data type="filelists"> <location href="repodata/filelists.xml.gz"/> <checksum type="sha">588ab33cce8e860a122d65a41732e0ec64211b0e</checksum> <timestamp>1297028256</timestamp> <open-checksum type="sha">9900ba15e9ee404a39f5c79667f9218d58785762</open-che cksum> </data> <data type="primary_db"> <location href="repodata/primary.sqlite.bz2"/> <checksum type="sha">28cf50779cf9980daf65c30c701c15bc273fa718</checksum> <timestamp>1297028258</timestamp> <open-checksum type="sha">4d8ffe4996007cba9524f4921a070961c6b9f6dd</open-checksum> <database_version>10</database_version> </data> <data type="primary"> <location href="repodata/primary.xml.gz"/> <checksum type="sha">3cfa26f5045b5f686a9c435af8f4ce76ed5c2721</checksum> <timestamp>1297028256</timestamp> <open-checksum type="sha">c5dc522811bdcccf1262a676114f6c874ab8b2ad</open-checksum> </data> <data type="group"> <location href="repodata/yumgroups.xml"/> <checksum type="sha">94bb5d121e662e57176131dfabd9db1e1b8335fa</checksum> <timestamp>1296125151</timestamp> </data> </repomd> thanks in advance!! -- GPG me!! gpg --keyserver pool.sks-keyservers.net --recv-keys F186197B

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Configuring a cluster
by Johnny H 08 Feb '11

08 Feb '11

Dear Centos users, I am not sure if this the correct place to post but it seems sensible. I have an 8 node cluster which I want to install/configure Centos. As I am not a sys-admin, can anyone advise me on what I should do? Any suggestions appreciated. Thank you.

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Discuss February 2011