Discuss September 2005

discuss@lists.centos.org

243 participants
335 discussions

RE: [CentOS] Paranoid Firewalling
by Minica, Nelson (EDS) 06 Sep '05

06 Sep '05

It will reduce bandwidth, not all, maybe not much, but unestablished TCP connections take less bandwidth than established, with most of the bandwidth being used by the protocol data on top of the established session (even if its just a reject). Nelson

1 0

sending key strokes to applications
by Jerry Geis 06 Sep '05

06 Sep '05

All, Is there a way to send key strokes to applications under X? I wish to send F11 to mozilla/firefox to put it in full screen mode. Not sure why there is not a command line parameter to do it. Just some utility that could be run that sends a keystroke to an application. THanks Jerry

1 0

snmp values for interface traffic - Centos 3.5/x86_64
by Les Mikesell 06 Sep '05

06 Sep '05

Is there a problem with the values returned from snmp for ethx interface traffic on x86_64? I have cacti graphing several servers that should peak around 200k/s and it sometimes pegs at 100M for periods of time when in fact the interfaces are not busy at all. I did a 'yum update' and rebooted, and things cleared up for a while, but now at least one is going crazy again, so perhaps the reboot just helped until something triggered the condition again. Stopping/starting snmpd doesn't help and the values from ifconfig look sane. I haven't seen anything like it on x86 servers doing otherwise similar things, just the x86_64's. -- Les Mikesell lesmikesell(a)gmail.com

1 0

Kernel Panic!
by Mark Elam 06 Sep '05

06 Sep '05

Hey all, Long time user of Centos, I really love what you guys are doing here. I have a farm of 50 Centos 4.1 machines. (originally 4.0 updated with yum up to current 4.1). Ever since I updated to the 2.6.9-11 kernel I am getting a lot of kernel panics. 7 machines suffered kernel panics over the weekend. Funny that they were the only ones that are booted into the new kernel! The rest haven't been rebooted yet so they are still at the 2.6.9-5 kernel. They all have similar messages in the logs as show below. Any ideas on where to look for the problem? Has anyone else seen this? Machine info: Typical of all 50 machines: P4 3Ghz 2gb ram U320 SCSI disk w/ lsi scsi controller Intel Workstation boards Nvidia graphics All machines exactly the same, installed w/ kickstart w/ these packages: %packages @ office @ legacy-software-development @ editors @ system-tools @ base-x @ gnome-software-development @ graphics @ smb-server @ development-tools @ printing @ text-internet @ kde-software-development @ kde-desktop @ x-software-development @ mail-server @ legacy-network-server @ sound-and-video @ gnome-desktop @ ftp-server @ network-server @ graphical-internet vnc telnet-server rsh-server kernel-smp grub kernel xemacs rusers-server /var/log/messsages: Sep 3 04:03:10 qu015 kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000054 Sep 3 04:03:10 qu015 kernel: printing eip: Sep 3 04:03:10 qu015 kernel: c016c583 Sep 3 04:03:10 qu015 kernel: *pde = 0bb6d001 Sep 3 04:03:10 qu015 kernel: Oops: 0000 [#1] Sep 3 04:03:10 qu015 kernel: SMP Sep 3 04:03:10 qu015 kernel: Modules linked in: nvidia(U) vmnet(U) vmmon(U) nfs nfsd exportfs lockd sunrpc md5 ipv6 parport_pc lp parport autofs4 sr_mod ide_scsi dm_mod button battery ac joydev uhci_hcd ehci_hcd snd_maestro3 snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_page_alloc snd soundcore e1000 floppy ext3 jbd mptscsih mptbase sd_mod scsi_mod Sep 3 04:03:10 qu015 kernel: CPU: 1 Sep 3 04:03:10 qu015 kernel: EIP: 0060:[<c016c583>] Tainted: P VLI Sep 3 04:03:10 qu015 kernel: EFLAGS: 00010202 (2.6.9-11.ELsmp) Sep 3 04:03:10 qu015 kernel: EIP is at iput+0x25/0x61 Sep 3 04:03:10 qu015 kernel: eax: 00000040 ebx: f3a85b74 ecx: f8c7bbb9 edx: f3a85b74 Sep 3 04:03:10 qu015 kernel: esi: f222b89c edi: f222b8a4 ebp: 0000006b esp: f7ceeeec Sep 3 04:03:10 qu015 kernel: ds: 007b es: 007b ss: 0068 Sep 3 04:03:10 qu015 kernel: Process kswapd0 (pid: 43, threadinfo=f7cee000 task=f7d1b7b0) Sep 3 04:03:10 qu015 kernel: Stack: f3a85b74 c016a1d8 00000000 00000092 00000000 f7ffe9e0 c016a553 c0144e2c Sep 3 04:03:10 qu015 kernel: 00d70a00 00000000 00000061 00000000 00023313 000000d0 00000020 c031ad80 Sep 3 04:03:10 qu015 kernel: 00000002 c031ad80 0000000c c01460b8 c02c5604 00023313 f7ceef9c 00000000 Sep 3 04:03:10 qu015 kernel: Call Trace: Sep 3 04:03:10 qu015 kernel: [<c016a1d8>] prune_dcache+0x13f/0x18e Sep 3 04:03:10 qu015 kernel: [<c016a553>] shrink_dcache_memory +0x14/0x2b Sep 3 04:03:10 qu015 kernel: [<c0144e2c>] shrink_slab+0xf8/0x161 Sep 3 04:03:10 qu015 kernel: [<c01460b8>] balance_pgdat+0x1d2/0x2f8 Sep 3 04:03:10 qu015 kernel: [<c02c5604>] schedule+0x844/0x87a Sep 3 04:03:10 qu015 kernel: [<c01462a8>] kswapd+0xca/0xcc Sep 3 04:03:10 qu015 kernel: [<c011f6ee>] autoremove_wake_function +0x0/0x2d Sep 3 04:03:10 qu015 kernel: [<c02c7296>] ret_from_fork+0x6/0x14 Sep 3 04:03:10 qu015 kernel: [<c011f6ee>] autoremove_wake_function +0x0/0x2d Sep 3 04:03:10 qu015 kernel: [<c01461de>] kswapd+0x0/0xcc Sep 3 04:03:10 qu015 kernel: [<c01041f1>] kernel_thread_helper+0x5/0xb Sep 3 04:03:10 qu015 kernel: Code: ff e9 fa fe ff ff 53 85 c0 89 c3 74 58 83 bb 3c 01 00 00 20 8b 80 a4 00 00 00 8b 40 24 75 08 0f 0b 4c 04 3d e7 2d c0 85 c0 74 0b <8b> 50 14 85 d2 74 04 89 d8 ff d2 8d 43 1c ba 70 fc 31 c0 e8 59 Sep 3 04:03:10 qu015 kernel: <0>Fatal exception: panic in 5 seconds Thanks! Mark Elam

4 3

802.11g pcmcia card?
by Marko A. Jennings 06 Sep '05

06 Sep '05

Could someone, please, suggest an 802.11g pcmcia card that works well under CentOS 4? Thank you. Marko

5 7

Changing permissions on files that only exist during USB operation
by Dave Gutteridge 06 Sep '05

06 Sep '05

A while back I got help in getting my Palm Pilot to connect to CentOS, and through the advice I got here I was able to successfully back up my files to the computer using the CentOS default Palm utility. However, I now want to use JPilot to sync and install files. But when I attempt to sync through JPilot, I get the following error: ******************************* Syncing on device /dev/pilot Press the Hotsync button now ******************************* pi_bind Invalid argument Check your serial port and settings Exiting with status SYNC_ERROR_BIND Finished I searched on the net, and it would seem that this is because of a permissions problem with the /dev/pilot files. The advice I am following is here: http://www.brandonhutchinson.com/Running_JPilot_as_a_non-privileged_user.ht… On this page the writer says that there are two ways to solve the problem - make the user the owner of the device, or make the device world writable. The author of the page says "making files (especially devices) world-writable should be avoided", but I think I'm not bothered either way. In any case, when it comes to making the device owned by anyone or world-writable, I'm not sure how to proceed. Retracing some of the steps given tome on this list before, I can see that the relevant device files have the following permissions: [root@localhost dev]# ls -l /dev/ttyUSB* /dev/pilot lrwxrwxrwx 1 root root 7 Sep 3 11:57 /dev/pilot -> ttyUSB1 crw-rw---- 1 root uucp 188, 0 Sep 3 11:57 /dev/ttyUSB0 crw------- 1 dave uucp 188, 1 Sep 3 11:57 /dev/ttyUSB1 So, I either want to give the user "dave" permission to use ttyUSB 1 and 0, or make those files world-writable. But where I hit a wall is that I can't figure out how to change the permissions on these files because they only appear when I hot sync the palm, a process that only lasts for a few seconds, maybe 15 or 20 at the most, and also tends to get enough attention from the CPU to make it so it's tough to switch to the command line and enter in any commands in time. I tried the following, but the settings don't seem to stick for the next sync operation: [root@localhost dev]# chown dave /dev/ttyUSB0 /dev/ttyUSB1 The advice I got last time on this list did speak about permissions, but unfortunately, I didn't pursue the issue because I thought the issue had been solved when I was able to make the basic connection at all to CentOS. So my question is, how do I change permission on these temporarily existing device files to that JPilot will not return errors? Dave

5 23

sshd ipv6 logging in CentOS4
by Francois Caen 06 Sep '05

06 Sep '05

Hello folks, Since I started using CentOS4, one thing has been bugging me: sshd's ipv6 logging as seen here: Failed password for root from ::ffff:83.220.130.10 port 43511 ssh2 Not a big deal, but I'd be really happy if I could get it to log in ipv4 format like on CentOS3. Any suggestion? Thanks, Francois

5 10

Yum thing
by Henk van Lingen 06 Sep '05

06 Sep '05

Hi, As there is no (decent) way to specify a particular repo for an particular package with yum, I'm having an odd problem: Although the version numbers differ, I have 2 spamassassin pkgs in different repo's (updates and my own addons) which are seen as updates to eachother: jelsum:/root-# tail -11 /var/log/yum.log Sep 02 04:26:34 Installed: perl-Mail-SpamAssassin.i386 3.1.0-1 Sep 02 04:26:35 Updated: spamassassin.i386 3.1.0-1 Sep 03 05:01:36 Obsoleting: spamassassin.i386 3.0.4-1.el4 Sep 03 05:01:37 Erased: perl-Mail-SpamAssassin Sep 04 04:37:52 Installed: perl-Mail-SpamAssassin.i386 3.1.0-1 Sep 04 04:37:53 Updated: spamassassin.i386 3.1.0-1 Sep 05 04:21:15 Obsoleting: spamassassin.i386 3.0.4-1.el4 Sep 05 04:21:16 Erased: perl-Mail-SpamAssassin Sep 06 04:34:37 Installed: perl-Mail-SpamAssassin.i386 3.1.0-1 Sep 06 04:34:50 Updated: syslinux.i386 3.11-1.2.el4.rf Sep 06 04:34:51 Updated: spamassassin.i386 3.1.0-1 What can be wrong? Cheers, -- Henk van Lingen, Systems & Network Administrator (o- -+ Dept. of Computer Science, Utrecht University. /\ | phone: +31-30-2535278 v_/_ http://henk.vanlingen.net/ http://www.tuxtown.net/netiquette/

4 8

php mail extensions
by Melinda Odom 06 Sep '05

06 Sep '05

Hi, I have recently had problems with doing a security update from the centos mirrors where the mail extensions were missing from the php package so any ecommerce sites stopped after the update via yum: php i386 4.3.2-25.ent.centos.1 update php-imap i386 4.3.2-25.ent.centos.1 update php-mysql i386 4.3.2-25.ent.centos.1 update php-pgsql i386 4.3.2-25.ent.centos.1 update We reverted back to php-4.3.2-24 to quickly solve the problem. Is there a mirror that has the complete package for CentOS 3.5? Also, am considering upgrading to CentOS 4 so is this easily done from 3.5 and would there be any problems with the packages for 4? Thanks! Sincerely, Melinda Odom www.designhosting.biz 479-471-0891 -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.10.18/89 - Release Date: 9/2/2005

3 2

Linux Trademarked?
by William Warren 06 Sep '05

06 Sep '05

http://www.theinquirer.net/?article=25529 what's everyone's thoughts on this one? -- My "Foundation" verse: Isa 54:17 No weapon that is formed against thee shall prosper; and every tongue that shall rise against thee in judgment thou shalt condemn. This is the heritage of the servants of the LORD, and their righteousness is of me, saith the LORD. -- carpe ductum -- "Grab the tape" CDTT (Certified Duct Tape Technician) Linux user #322099 Machines: 206822 256638 276825 http://counter.li.org/

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Discuss September 2005