Discuss June 2012

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180 discussions

CentOS-5.8 - Problem booting remote host
by James B. Byrne 21 Jun '12

21 Jun '12

Kernel 2.6.18-308.8.2.el5 I recently experienced an odd problem with a host at our warm-site location. The facility we use suffered an hvac failure during elevated ambient temperatures (30C+) on Monday past and the equipment room reportedly cooked for some hours. It was sufficient that our equipment shutdown. In all probability this was due to an over-temp condition since the systems are all powered from a UPS but possibly there was an extended power out instead. Whatever the cause one of our hosts did not restart subsequent to this shutdown. Which condition required my presence on site. When it was powered up today in situ the host's console would display the CentOS splash screen with the message [press any key to enter menu] and then the message "Booting in ....4 seconds" However, the countdown timer never changed from the initial value and the restart never took place. When I entered the console menu and selected the most recent kernel available the system booted normally. It had to do a lot of disk remediation on the first go through but all that completed without untoward difficulty. Subsequent shutdowns displayed the same behaviour. The splash screen displayed, the boot timer message showed, and then nothing changed thereafter unless and until I entered the boot menu. Selecting the default kernel in the boot menu allowed the restart to continue, this time without any unusual reports. I repeated this process several times more just to confirm that this was not a transient effect. Each time operator intervention from the console was required to restart the system but once this was done no further problems were noted. I repeated the process and rebooted using each of the older kernels present. As far as I could determine there was nothing wrong with any of the boot images once past the auto-select segment of the boot process. I then went into /boot/grub.conf and changed the default boot from index 0 to index 1 so as to use the previous kernel. Following this configuration change thereafter the system restarted normally without operator intervention. The problem kernel was installed from Updates on June 13 and was running from that date as shown in the log entries below. This was a remote restart and evidently it completed without any problem. Jun 13 10:15:59 inet04 shutdown[19274]: shutting down for system reboot . . . Jun 13 10:16:25 inet04 exiting on signal 15 Jun 13 10:18:35 inet04 syslogd 1.4.1: restart. Jun 13 10:18:35 inet04 kernel: klogd 1.4.1, log source = /proc/kmsg started. Jun 13 10:18:35 inet04 kernel: Linux version 2.6.18-308.8.2.el5 (mockbuild@build er10.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-52)) #1 SMP Tue Jun 12 09:57:26 EDT 2012 The current syslog shows repeated restarts commencing at 18:12 on Jun 17 and ending at 19:08, after which the system no longer records any activity whatsoever until I restarted it manually earlier today. These two syslogd entries are adjacent in /var/log/messages Jun 18 19:08:48 inet04 kernel: PROBE_BLACKIST: IN=eth0 OUT= MAC=00:1c:c4:a1:66:1e:00:18:73:e8:35:a1:08:00 SRC=126.67.126.141 DST=209.47.176.105 LEN=48 TOS=0x00 PREC=0x00 TTL=110 ID=56792 DF PROTO=TCP SPT=2153 DPT=445 WINDOW=64240 RES=0x00 SYN URGP=0 Jun 20 12:11:31 inet04 ntpd[2480]: time reset +147721.498633 s Have any of you ever experienced anything like this? Does anyone have any idea what might have caused the corruption of the restart mechanism or where the problem might be? -- *** E-Mail is NOT a SECURE channel *** James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Swap Partition in CentOS 5.8
by Kaushal Shriyan 20 Jun '12

20 Jun '12

Hi, Any recommendation to set SWAP Partition in CentOS 5.8 on 32GB Physical Memory Box and also how does swap partition is being used and any utility to know when was swap partition being used. Regards, Kaushal

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CentOS-announce Digest, Vol 88, Issue 12
by centos-announce-request＠centos.org 20 Jun '12

20 Jun '12

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Memory recognition in 6.2
by Hugh E Cruickshank 20 Jun '12

20 Jun '12

Hi All: I have an HP DL380G5 server which I am loading CentOS 6.2 on and it does not appear to recognize all of the RAM installed on the server. The BIOS is reporting 26GB however top is reporting: Mem: 15720140k total, 418988k used, 15301152k free, 30256k buffers Swap: 17956856k total, 0k used, 17956856k free, 135536k cached and free is reporting: total used free shared buffers cached Mem: 15720140 418848 15301292 0 30256 135536 -/+ buffers/cache: 253056 15467084 Swap: 17956856 0 17956856 I have tried adding the mem= parameter to the /boot/grub/grub.conf file as in: title CentOS (2.6.32-220.17.1.el6.i686) root (hd0,0) kernel /vmlinuz-2.6.32-220.17.1.el6.i686 ro [SNIP] initrd /initramfs-2.6.32-220.17.1.el6.i686.img mem=26624M but this has not appeared to work. Any suggestions would be gratefully appreciated. TIA Regards, Hugh -- Hugh E Cruickshank, Forward Software, www.forward-software.com

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Deleting Files
by Matt 20 Jun '12

20 Jun '12

I want to safely delete all files in a certain directory that are exactly 32 characters long. This is on CentOS 5.x. How would I do that?

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RHEL6.3 is on rhn
by Rainer Traut 20 Jun '12

20 Jun '12

Just fyi, since yesterday evening RHEL 6.3 is available on rhn, but I see no announcement yet. [root@rhel6-test ~]# uname -a Linux rhel6-test 2.6.32-279.el6.x86_64 #1 SMP Wed Jun 13 18:24:36 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux [root@rhel6-test ~]# cat /etc/redhat-release Red Hat Enterprise Linux Server release 6.3 (Santiago) Rainer

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PMA attacks
by m.roth＠5-cent.us 20 Jun '12

20 Jun '12

It appears to be a low-level attack, not so frequent as to be banned permanently, just a number of times a day. I did google on this, and I gather it's looking for phpmyadmin. We've been getting one from one specific network in Russia for weeks Here are more information about 91.201.64.24: [Querying whois.ripe.net] [whois.ripe.net] <snip> % Information related to '91.201.64.0 - 91.201.67.255' inetnum: 91.201.64.0 - 91.201.67.255 netname: Donekoserv descr: DonEkoService Ltd country: RU <snip> But now I'm seeing the same from Azerbaijan, and France, and elsewhere. Two questions: first, are other folks seeing this? and second, I can't imagine malware this stupid, to keep hitting the same sites over and over when it's not found, rather than bad password or user, so I'm wondering if this could be a targetting vector for an upcoming serious attack using another vector. Opinions? mark

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My ROOT PASSWORD Is GETTING RESET After EVERY REBOOT
by chiong lawrence 20 Jun '12

20 Jun '12

Hello there, I'm using CentOS v6.2 x86_64bit. I'm confuse and can't figured-it-out after I run my KVM virtual machine the root password is getting RESET after every reboot of my VM. Any help is very much appreciated. Thank you. ** *Please consider the environment before printing this email.*

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Re: [CentOS] Resizing est4 filesystem while mounted
by Jeff Boyce 19 Jun '12

19 Jun '12

Replying to the daily digest, with my response at the bottom. > Message: 18 > Date: Mon, 18 Jun 2012 22:28:31 +0200 > From: Dennis Jacobfeuerborn <dennisml(a)conversis.de> > Subject: Re: [CentOS] Resizing est4 filesystem while mounted > To: centos(a)centos.org > Message-ID: <4FDF8F6F.8030300(a)conversis.de> > Content-Type: text/plain; charset=ISO-8859-1 > > On 06/18/2012 10:09 PM, Jeff Boyce wrote: >> Replying to the daily digest, with my response at the bottom. >> >> >> >>> Message: 13 >>> Date: Fri, 15 Jun 2012 12:22:08 -0700 >>> From: Ray Van Dolson <rayvd(a)bludgeon.org> >>> Subject: Re: [CentOS] Resizing est4 filesystem while mounted >>> To: centos(a)centos.org >>> Message-ID: <20120615192207.GA23689(a)bludgeon.org> >>> Content-Type: text/plain; charset=us-ascii >>> >>> On Fri, Jun 15, 2012 at 12:10:09PM -0700, Jeff Boyce wrote: >>>> Greetings - >>>> >>>> I had a logical volume that was running out of space on a virtual >>>> machine. >>>> I successfully expanded the LV using lvextend, and lvdisplay shows that >>>> it >>>> has been expanded. Then I went to expand the filesystem to fill the new >>>> space (# resize2fs -p /dev/vde1) and I get the results that the >>>> filesystem >>>> is already xx blocks long, nothing to do. If I do a # df -h, I can see >>>> that >>>> the filesystem has not been extended. I could kick the users off the >>>> VM, >>>> reboot the VM using a GParted live CD and extend the filesystem that >>>> way, >>>> but I thought that it was possible to do this live and mounted? The RH >>>> docs >>>> say this is possible; the man page for resize2fs also says it is >>>> possible >>>> with ext4. What am I missing here? This is a Centos 6.2 VM with an ext4 >>>> filesystem. The logical volumes are setup on the host system which is >>>> also >>>> a Centos 6.2 system. >>> >>> Try resize4fs (assuming your FS is ext4). >>> >>> Ray >> >> Well, I have never seen a reference to resize4fs before (and yes my FS is >> ext4). It is not on my Centos 6.2 system, and doing a little searching >> through repositories for that specifically, or e4fsprogs, and I can't >> find >> it anywhere to even try it. Any google reference seems to point back to >> resize2fs. I ended up booting a live SystemRescueCD and using GParted >> via >> the GUI. My notes indicate that is what I had done previously also. I >> am >> still stumped, everything that I have read indicates that resize2fs can >> do a >> live resizing on ext4 file systems. Can anybody confirm or deny this? >> Is >> the reason I can't do this because it is on an LVM logical volume? >> Thanks. > > Please post some details about your storage topology. Without this > information its not really possible to be sure what is going on. > resizefs cannot work as long as the underlying layers don't see any change > in size and you didn't seem to look for that. > > Regards, > Dennis I provided some of that information in my original post, but if you can help explain why I couldn't seem to resize the file system while mounted here is more information. Host system is Centos 6.2 on a Dell PE T610 with hardware raid on a PERC H700. Raid 5 is setup across three disks with a fourth hot spare. I have created a volume group within the raid 5 encompassing most of my drive space. Within the VG I have created numerous logical volumes that are assigned to specific systems. Volume Group: vg_mei Logical Volumes: lv_earthroot lv_earthswap lv_earthvar lv_sequoiaroot lv_sequoiaswap lv_sequoiavar lv_sequoiahome lv_sequoiaecosystem Earth is my host system and Sequoia is one of the guest systems. lv_sequoiaecosystem is the space dedicated to our Samba server and is the LV that I was expanding to make more space available to the rest of the staff. I had successfully extended lv_sequoiaecosystem using the following command from root on earth (lvextend -L+50G /dev/vg_mei/lv_sequoiaecosystem). Issuing the command (lvdisplay /dev/vg_mei/lv_sequoiaecosystem) following this showed that the LV was successfully extended from 100 to 150 GB. I then logged onto sequoia as root and issued a df -h to determine which device needed the file system to be resized (/dev/vde1). The output below is current, after I resized the filesystem using GParted. [root@sequoia ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/vda2 4.5G 2.5G 1.8G 59% / tmpfs 1004M 112K 1004M 1% /dev/shm /dev/vda1 485M 55M 406M 12% /boot /dev/vde1 148G 85G 56G 61% /ecosystem /dev/vdd1 20G 1.3G 18G 7% /home /dev/vdc1 2.0G 266M 1.7G 14% /var Then from root on sequoia I issued the command (resize2fs -p /dev/vde1) and got back the result that the filesystem is already 26214144 blocks long, nothing to do. That is when I posted my first question about not being able to resize a live mounted filesystem. Is that enough information for your question, or is there something that I am not providing? Thanks. Jeff

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CentOS-announce Digest, Vol 88, Issue 11
by centos-announce-request＠centos.org 19 Jun '12

19 Jun '12

Send CentOS-announce mailing list submissions to centos-announce(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-announce or, via email, send a message with subject or body 'help' to centos-announce-request(a)centos.org You can reach the person managing the list at centos-announce-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-announce digest..." Today's Topics: 1. CESA-2012:0744 Moderate CentOS 6 python Update (Johnny Hughes) 2. CESA-2012:0743 Important CentOS 6 kernel Update (Johnny Hughes) ---------------------------------------------------------------------- Message: 1 Date: Mon, 18 Jun 2012 16:35:36 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CESA-2012:0744 Moderate CentOS 6 python Update To: centos-announce(a)centos.org Message-ID: <20120618163536.GA1946(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2012:0744 Moderate Upstream details at : https://rhn.redhat.com/errata/RHSA-2012-0744.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: 68b40bb24637e5151d56ff980b14ede5db07951b6325d9a54ead3498527e65fd python-2.6.6-29.el6_2.2.i686.rpm 8bcda8f75bde9eae4b89b264a28be6596a5a0bbe74caa150c745e0c517f59533 python-devel-2.6.6-29.el6_2.2.i686.rpm a97bcae9e9764c21665fd4b43f3ef67897b8aa336c997078b5b079df1a3f458b python-libs-2.6.6-29.el6_2.2.i686.rpm 0d659305707e6e7eabbdbf14b06367a4c2220c7c8446469d02851d1d9291a25d python-test-2.6.6-29.el6_2.2.i686.rpm d45f3d643582177adf242981bf66c89a8bcdf048bd64cdfceed6248a5e07364a python-tools-2.6.6-29.el6_2.2.i686.rpm 5f5c9798bf941d3061a159484a1816b29cef3928404eda6da69ceb661d6439d3 tkinter-2.6.6-29.el6_2.2.i686.rpm x86_64: 68b40bb24637e5151d56ff980b14ede5db07951b6325d9a54ead3498527e65fd python-2.6.6-29.el6_2.2.i686.rpm 9d5f64d06c7cc75c166f635bd8d0a842d999d5a1f46ba51eb57c2b4ce3ac09f1 python-2.6.6-29.el6_2.2.x86_64.rpm 8bcda8f75bde9eae4b89b264a28be6596a5a0bbe74caa150c745e0c517f59533 python-devel-2.6.6-29.el6_2.2.i686.rpm cd2eeb31d0c9795045d7fb38abe545193393af71257d98e382ca2a3c5d314e51 python-devel-2.6.6-29.el6_2.2.x86_64.rpm a97bcae9e9764c21665fd4b43f3ef67897b8aa336c997078b5b079df1a3f458b python-libs-2.6.6-29.el6_2.2.i686.rpm 901dd463ec89fb78dfc7f67e23f3d045422fd2d5a83d4d2bfa0ec4ea4aa4f929 python-libs-2.6.6-29.el6_2.2.x86_64.rpm de7ddc6b116cd5b88aabb4d6b00d2f41bc0f95aa247c6e21790f59e78c58464b python-test-2.6.6-29.el6_2.2.x86_64.rpm 00a7b81b38b804b71667f45570c54c5910c4d53c08aeb8072d21d4a381c5f4ac python-tools-2.6.6-29.el6_2.2.x86_64.rpm 98339b5d758e08f8e9b6753c403da3879250b2d474197727cb417263f902efdf tkinter-2.6.6-29.el6_2.2.x86_64.rpm Source: e6e6fdbb082ebe1240c55739e9ba357a86fd37a59b757fa51faf174e18526c96 python-2.6.6-29.el6_2.2.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ Message: 2 Date: Tue, 19 Jun 2012 10:27:24 +0000 From: Johnny Hughes <johnny(a)centos.org> Subject: [CentOS-announce] CESA-2012:0743 Important CentOS 6 kernel Update To: centos-announce(a)centos.org Message-ID: <20120619102724.GA20582(a)chakra.karan.org> Content-Type: text/plain; charset=us-ascii CentOS Errata and Security Advisory 2012:0743 Important Upstream details at : https://rhn.redhat.com/errata/RHSA-2012-0743.html The following updated files have been uploaded and are currently syncing to the mirrors: ( sha256sum Filename ) i386: ea56dcbea54d7249587d63c247dd5cda34b911112a3cef1b281c82441400ef71 kernel-2.6.32-220.23.1.el6.i686.rpm e47fb9d96ad61173552f60a5e10bd6a81a30f1a3b35327bf8dbabfed7616e5e2 kernel-debug-2.6.32-220.23.1.el6.i686.rpm c94d9f48253cdf655c88366fd7d2341e4d3247c77f266a5a14abf372a4cefc03 kernel-debug-devel-2.6.32-220.23.1.el6.i686.rpm 0e269b17567c91f68f9b8926de52c331515f71efb2575a42f297a561ec9a1943 kernel-devel-2.6.32-220.23.1.el6.i686.rpm c1a415fcb071c2eb3f0337d55063590a3d45a2185a253b3ab8092569e24970cb kernel-doc-2.6.32-220.23.1.el6.noarch.rpm ae35c0d77e4968b882a4f419ca00c87171ae23f909f0ddefb61316e3c33b6676 kernel-firmware-2.6.32-220.23.1.el6.noarch.rpm 5c98cd2662d7a7350ce19c95f5666c0bd8db7a7a1f85a4aac5eec89cdd6d3b50 kernel-headers-2.6.32-220.23.1.el6.i686.rpm 766ad9e000c8e6d65a09352bb98956eaa0e92808de2e0621df05f6f6136fcfd8 perf-2.6.32-220.23.1.el6.i686.rpm adb363026b40404f4a6e445b6d247787a51f4c270e9a477a5704bbb1b9bdacfd python-perf-2.6.32-220.23.1.el6.i686.rpm x86_64: 2d950cad03e58fbe41b18ea9f676e9f8035c50e1110e35d7ade84357d531b0b0 kernel-2.6.32-220.23.1.el6.x86_64.rpm cbdc58c22ea03c12a2a06c56d448d3fabeb88cb0e807b801b8f7366e7dc5753d kernel-debug-2.6.32-220.23.1.el6.x86_64.rpm 8d4a7488b3cf9797c4f0a2770a2b6545eebbd8db2f3675e8d72c47f2566792df kernel-debug-devel-2.6.32-220.23.1.el6.x86_64.rpm e1a91610aef2da26f16df08e67e7103c939e85b44b4161cc0ca19560059deb62 kernel-devel-2.6.32-220.23.1.el6.x86_64.rpm 5a612f281c420a93923e2c5d97af77dccf854838abe8e7b4e6e720a8e6416074 kernel-doc-2.6.32-220.23.1.el6.noarch.rpm 48310089aca9909efad1c362da7903e5df11b1d4483d2b6dc582c7c6f4094947 kernel-firmware-2.6.32-220.23.1.el6.noarch.rpm 9f57462f7fecf0b5e6f2e7fcb5280bd36b147e50193ed471ea174c4d173cea91 kernel-headers-2.6.32-220.23.1.el6.x86_64.rpm 56fc104e5deeece73a857a9b45c11a39e55142db0dfe3b35fc04f42380e6f33b perf-2.6.32-220.23.1.el6.x86_64.rpm 35d3b8d75b5e913692f1db7c6b255232bb906feb5b737251eeb8f1f36713b8fd python-perf-2.6.32-220.23.1.el6.x86_64.rpm Source: ead5c509c3877ce23787bf2cafb47c31cf9c1dfb39976a372d5f36f1953a710c kernel-2.6.32-220.23.1.el6.src.rpm -- Johnny Hughes CentOS Project { http://www.centos.org/ } irc: hughesjr, #centos(a)irc.freenode.net ------------------------------ _______________________________________________ CentOS-announce mailing list CentOS-announce(a)centos.org http://lists.centos.org/mailman/listinfo/centos-announce End of CentOS-announce Digest, Vol 88, Issue 11 ***********************************************

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Discuss June 2012