Discuss December 2008

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247 participants
257 discussions

network driver needed at install time
by Jerry Geis 12 Dec '08

12 Dec '08

I am wanting to use a motherboard that uses the 8111b reaktek chip. http://wiki.centos.org/AdditionalResources/HardwareList/RealTekRTL8111b This was great information. My question is now that I have a compiled module for centos 5.2 is there any way I can include that module in a DVD or load the module from USB at the installation time??? I use kickstart and that needs to work over the network. Is there an easy way to load a network driver at install from USB or something like that? Jerry

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Is 4GB memory the 64bit switch tipping point?
by Kenneth Burgener 12 Dec '08

12 Dec '08

I am curious what should be the benchmark for making the choice of switching from 32bit to 64bit Linux? I have a few assumptions below. Is my logic sound? (This is a follow up to the "Adding RAM" thread) Assumptions: 1. 4GB Memory. The main benefit of 64bit mode is the ability to address more than 4GB of RAM. I assume that you use 64bit mode if you want to *efficiently* have more than 4GB of RAM, or intend to upgrade past 4GB in the foreseeable future. (I emphasize "efficiently" because PAE is an option, if you are desperate to keep 32bit mode with more RAM) 2. Overhead. It is my assumption that 64bit has more "overhead", being that the registers are now 64bits long, instead of 32bit, which would mean more bits to pass around the system. So if you have less than 4GB of RAM, 32bit mode would perform better than 64bit mode. 3. Compatibility. Linux has made incredible strides to make 64bit Linux very robust and compatible, but I still occasionally see binary applications/plugins/drivers that popup which are 32bit mode only. This is usually only a problem with Desktop systems that want bleeding edge, or not as well supported software. 4. Desktop vs Servers. Current "desktops" machines generally have around 2GB of RAM, or less. Current "server" machines generally have around 2GB of RAM, or more (much more). Because of the overhead (#2) and compatibility (#3) I would think that Desktops would benefit from using 32bit mode, and Servers would benefit from 64bit mode. Is my logic sound? Thanks, Kenneth

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Re: [CentOS] pop3 attack
by David G. Miller 12 Dec '08

12 Dec '08

Toby Bluhm <tkb(a)alltechmedusa.com> wrote: > Or switch to postfix. I plunked "relayhost = smtp-server.roadrunner.com" > into main.cf & away it went. Having read the rest of the thread, I respond at the risk of furthering the flames. The sendmail configuration line is just as trivial: define('SMART_HOST','[smarthost.example.net]')dnl Check the quoting since the article uses matching left and right single quotes which is probably a figment of the editor used for writing the article. Here's the reference if you'd like more information: http://www.elandsys.com/resources/sendmail/smarthost.html Cheers, Dave -- Politics, n. Strife of interests masquerading as a contest of principles. -- Ambrose Bierce

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Re: [CentOS] [users] URGENT: Installed libdvdcss from rpmforge and k3b trashed /
by Dag Wieers 12 Dec '08

12 Dec '08

On Thu, 11 Dec 2008, MHR wrote: > I am running CentOS 5.2 with all the latest updates with the GNOME DE > and k3b. I put a DVD in the tray and tried to make a copy, but k3b > says it can't copy an encrypted disk. > > So, I installed libdvdcss from rpmforge: > > libdvdcss.i386 1.2.9-2.el5.rf rpmforge > > When I restarted k3b, it hung. After several minutes of waiting for > it to respond, I found that the whole system had become unresponsive - > no mouse movement or clicks, nor keyboard keys recognized. Unable to > do anything else with the system, I rebooted it. > > When the system came up, there were problems in /, so I had to run > e2fsck manually on /, and it found and fixed a whole slew of errors. > However, when the system rebooted after a successful fsck, there are > now errors in efforts to access various files and directories under > /var, mostly in /var/lock, but also /var/gdm (meaning no graphics), > all kinds of daemons are not starting up, and so on. > > Has anyone else seen anything like this? This is my primary desktop > system at work (I'm using my backup system at the moment), and I need > to have it back up a.s.a.p. Any suggestions? Why would this be related to libdvdcss ? I really do not see any link between the filesystem problems and libdvdcss. In the thread on the centos mailinglist you already identified the slowness to be related to an NFS mount. What if your system had filesystem errors all along, and when you installed the libdvdcss package it triggered these error into a fatal state. When you rebooted, the filesystem is being checked since it was no longer clean. You ran fsck without first doing fsck -N to see what would happen. The filesystem check also found out about all the other filesystem errors, and damaged files and brought the filesystem into a state where you see the problems you described. I would think you have had hardware problems, (or maybe your sudden reboot triggered a filesystem bug). Again, I seriously doubt the problems you have had are related to the libdvdcss RPM package. And without any proof I don't feel tempted to take any action. -- -- dag wieers, dag(a)wieers.com, http://dag.wieers.com/ -- [Any errors in spelling, tact or fact are transmission errors]

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URGENT: libdvdcss install hosed /var
by MHR 12 Dec '08

12 Dec '08

I am running CentOS 5/2 (latest updates) with the GNOME DE on a 32-bit machine (at work). I have k3b installed, and I was trying to copy a DVD earlier this morning, but k3b said it couldn't read encrypted DVDs. So, I installed libdvdcss from rpmforge and restarted k3b. It hung the system. I rebooted, and / had been damaged. After running e2fsck from the repair prompt, I rebooted and a whole slew of errors revolving around various /var directories that did not ecist occurred. I have been trying to repair /var, and so far with a fair modicum of success, but I've hit an interesting wall - two, actually. 1) The gdm refuses to come up. It claims that "Server Authorization directory (daemon/ServAuthDir) is set to /var/gdm, but this does not exist...." However: # ll -d /var/gdm drwxrwx--T 2 root gdm 4096 Dec 11 10:31 /var/gdm # ll /var/gdm total 8 -rw-r----- 1 root root 45 Nov 26 10:47 :0.Xauth -rw-r--r-- 1 root root 63 Dec 11 09:14 :0.Xservers This is identical to my backup system (which is not surprising - I set up the dir and copied the files from here - was that a bad idea?). 2) The following daemons fail to start: auditd, NFS statd, avahi and HAL. I've tried to pin down why the avahi daemon won't start because it keeps logging permissions errors trying to create the pid file /var/run/avahi-daemon//pid, but the setup of /var /var/run and /var/run/avahi-daemon are all identical to this (backup) machine. Any suggestions? Or is there a better, more comprehensive repair facility available? BTW, OT: Does anyone know why this might have happened? I have all this installed at home, no problems whatsoever (libdvdcss works seamlessly with all my DVD tools, including k3b). Thanks! mhr

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PHP5 on CentOS4.7?
by Rudi Ahlers 12 Dec '08

12 Dec '08

Hi all, Does anyone know if CentOS 4.7 will support PHP5 natively? I have searched centos.org site, but can't see anything related to this? -- Kind Regards Rudi Ahlers

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Watchdog process?
by Amos Shapira 12 Dec '08

12 Dec '08

Hello, Is there a generic built-in way on CentOS to overlook that a specific process is alive and re-spawn it (or just run a configured command) when it dies? I know how to script things so a parent will watch its child, but was wondering whether there is something more readily available instead of having to reinvent the wheel. The process must be controlled via a /etc/init.d/... script and should be stop-able (it runs in a primary/stand-by configuration), so use of "respawn" in inittab is not a solution. So far googl'ing for "watchdog" comes up with references about system watchdog - which will reboot the system if the kernel appears to be stuck. Thanks, --Amos

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Combining active-backup and round-robbin network bonding
by Timm Essigke 12 Dec '08

12 Dec '08

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 I think my first mail was not processed because it was send before the confirmation mail. In case you receive this mail twice, I am sorry! - --------------------------------------------------------------------- Hi, I want to set up two servers as a active-active HA cluster. Both servers have four Gbit NICs. Besides an unmanaged Gbit switch for the cluster communication (connected with eth0) I have two managed Gbit switches to which the servers and the clients will be attached. My idea was to use the following setup: switch2------eth1--bond1-- | switch1------eth2 | | | bond0 | switch1------eth3 This is for server1. Server2 should have two links with switch2 and one with switch1 instead. Switch1 and switch2 have a 3x1GBit 802.3ad trunk as switch interconnect. bond0 should be balance-rr (mode 0) to have load balancing and fault tolerance on switch2. The primary use is to double the capacity of the Gbit link. bond1 should be active-passive (mode 1) with bond0 as primary interface. This should guarantee availability of server1 to the workstations attached to switch2 in case switch1 fails. Both modes work fine as long as I use ethX-devices. According to /proc/net/bonding/bond0 I can bring bond0 up (MII Status: up), but in /proc/net/bonding/bond1 I can not bring the slave interface bond0 up. The "Permantent HW addr" is 00:00:00:00:00:00 no matter if I specify a MAC in ifcfg-bond0 or not. ifconfig bond0 shows the MAC of eth1 as HWaddr and the device as "UP BROADCAST RUNNING SLAVE MASTER MULTICAST". I use ARP for link monitoring, because MII monitoring seemed not reliable with my hardware (Broadcom BCM5708 + Intel 82571EB NICs and 3com 3848 + 4500G switches) on CentOS 5.2 (2.6.18-92.1.18.el5xen). How can I activate bond0 to work in the way I intended? Is such a setup impossible (i.e. to enslave bond-interfaces)? Is there a different/better way of doing what I want? Thanks in advance! Timm -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iQEVAwUBSUFrVMGs9/GXBO2vAQJAfgf/ZrM74TXKoX7PdD54V9i7ly0UyBRsIsRB Z2Nwq3YuUCkmN2wXSUwIyrccs/PeZ+Lm3k7THhbUGIxHXjI6EdfeJYgy5FYuNsWG 6BpUUUmgMSz7vXQ5NIJO9UkNpXQmgsjNpv5I0jwSvMRI/9blY5CHQf0pbxWG5dm8 Wz/YnvxwXf3ilNreEu7hTZ3C/ohnnUh8BRY0rmE0YKJRReeqol2at6GQ4XoPDw6m tAayNhv9+mUA1TYYvy/sOPXH9na143NSr4A7lPXG4l8aeS/obSI2359oZZyzR1Br 2brmensyswU9FbAreRr5/GIsWQ3zdQOdLoV9uTkzn57fD147u/ZiGQ== =Wk+k -----END PGP SIGNATURE-----

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Upgrading to Centos 4.7 on HP DL580G5 caused problems
by Dr Les Oswald 11 Dec '08

11 Dec '08

As part of patching a cluster which has two DL580G5 login nodes ( 4X Intel 7300 DC cpus) & 24 HP DL160G5 compute nodes ( 2x Intel 5272 DC cpus) we encountered an issue that I would like to record: I upgraded both DL580s to Centos 4.7 via yum but only rebooted one initially- this node, previously bomb-proof, started to hang randomly with no obvious messages logged to help with diagnosis. In the dmessage output I found this sequence never seem before Uhhuh. NMI received for unknown reason 20. Dazed and confused, but trying to continue Do you have a strange power saving mode enabled? Uhhuh. NMI received for unknown reason 30. Dazed and confused, but trying to continue (repeated several times) Googling revealed many different scenarios with this boot error message, some suggesting a memory error - Oh Joy, these two machines have 64GB RAM each. I then changed grub.conf to boot to the previous kernel 2.6.9-67.0.15.ELsmp instead of the updated version of 2.6.9-78.0.5.ELsmp. The boot-time error messages immediately went away and so far the systems are reliable. Has anyone an explanation or confirmation that they have seen or overcome the above issue? I should mention that the DL160 compute nodes have not exhibited this behaviour at all. Les Oswald

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bind specific ip address to iscsi target
by carlopmart 11 Dec '08

11 Dec '08

Hi all, I have setup a centos5.2 server (full updated) to serve iscsi disks using scsi-target-utils package. This server has two network adapters, one for remote administration and another to serve iscsi disk. How can I bind iscsi target service to only one ip address?? Many thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Discuss December 2008