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rsync via crontab spawns over 20 processes
by aurfalien＠gmail.com 23 Jan '11

23 Jan '11

Hi all, I've been running rsync via cron for a while now and all is well. However on one particular new 5.5 box, whenever its runs via crontab, the machine ends up with over 20 rsync processes and a load of ~14 and eventually the machine dies. But when running manually, I see it spawn 3 processes with a load of 1.5. My rsync command is simply; rsync --delete -avvH --progress source target Any thoughts? - aurf

8 13

ethernet configuration
by Ritika Garg 23 Jan '11

23 Jan '11

I pressed the tab "probe" by mistake near "bind to MAC address" in system->administration->network->edit->hardware device. After this the MAC address disappeared. Internet is not working. Shall I write the MAC address and activate again?

2 1

iscsi-iname
by rainer＠ultra-secure.de 23 Jan '11

23 Jan '11

Hi, I'm trying to set my iSCSI initiator name to a different value than the default. I edited /etc/iscsi/initiatorname.iscsi but iscsi-iname still shows the old value. How would I change it so it reflects the hostname? Best Regards, Rainer

1 0

Let's talk about compression rates
by S Mathias 23 Jan '11

23 Jan '11

http://pastebin.com/raw.php?i=MwDnhknf $ ls -Sl total 461252 -rw-rw-r--. 1 g g 111709730 Jan 22 11:06 linux-2.6.37.zip -rw-rw-r--. 1 g g 93174605 Jan 22 11:03 linux-2.6.37.tar.gz -rw-rw-r--. 1 g g 73552510 Jan 22 11:10 linux-2.6.37.tar.bz2 -rw-rw-r--. 1 g g 66333786 Jan 22 11:16 linux-2.6.37.7z -rw-rw-r--. 1 g g 64035788 Jan 22 11:16 linux-2.6.37.tar.7z -rw-rw-r--. 1 g g 63480808 Jan 22 11:20 linux-2.6.37.tar.xz $ I presume kernel.org knows this. Why doesn't people use e.g.: XZ? This is the same as in PDF's. DJVU files could be amazing too. They could compress [convert] a 400 MByte PDF to a 20 MByte DJVU. Amazing. Why don't these technologies spread?? Any opinions regarding it? Thanks.

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cloning a server
by PA 22 Jan '11

22 Jan '11

Hi, I have a centos 5 (current) mail server that I have compiled dovecot/postfix and installed some packages like mysql etc. These packages have been configured and changed to my liking. How can I now save all this and install it on another server without having to do all the work of compiling installing and configuring the same applications. Is it possible to burn this server image into multiple DVD's make it bootable and then install on another server. Basically I want to clone this server and make it easy to install on another similar hardware server without having to install centos and then manually installing/configuring dovecot/postfix/mysql etc. Not sure if I can create a bootable ISO that will install on new servers or what my options are. I would appreciate any suggestions. Paul

8 12

Missing Dependency
by Terry Hickey 22 Jan '11

22 Jan '11

Problem: I am trying to update the php package PHP Version 5.1.6 on CentOS release 4.8 to get rid of a script error: "PHP Fatal error: Call to undefined function dom_import_simplexml" while running yum update php I get the following --> Running transaction check --> Processing Dependency: libt1.so.5 for package: php-gd --> Finished Dependency Resolution Error: Missing Dependency: libt1.so.5 is needed by package php-gd I have searched on google and none of the solutions seem to work. Does anyone have any ideas? Terry

5 8

Re: [CentOS] How to disable screen locking system-wide?
by Giles Coochey 22 Jan '11

22 Jan '11

And in those nine years you claim to have had at least one major security incident. It beggars my belief.... You now publicly declare that your company not just advocates the sharing of passwords, but certainly encourages it, if not make it compulsory. If you were to have another security incident you would probably be hard pressed to be able to point the finger at anyone, especially as your lax security procedures are now public knowledge. Troll? Sorry for top posting Sent from my HTC Smartphone ----- Reply message ----- From: "Rudi Ahlers" <Rudi(a)SoftDux.com> Date: Thu, Jan 20, 2011 17:44 Subject: [CentOS] How to disable screen locking system-wide? To: "CentOS mailing list" <centos(a)centos.org> On Thu, Jan 20, 2011 at 6:29 PM, Giles Coochey <giles(a)coochey.net> wrote: > On 20/01/2011 17:11, Rudi Ahlers wrote: >> >> The message I'm trying to bring across is that users in the company >> shouldn't have passwords which admin doesn't know, or can't access. >> The PC's and data, well at least in our company, is the property of >> the company. Making it more difficult for an engineer to gain access >> to a user's PC automatically arises suspicion >> > > Hi Rudi, > > Your stance on this is counter-intuitive to me, are you able to cite any > good reference which recommends that administrators know user passwords? > > -- No, I can't. But I've been running a hosting & development company for 9 years now and this is the first problem I get out of the way right on the first day of an employees job. I'm personally involved in the accounts department (when I actually get time) since I want to know what goes on in my company. I also work close with the developers when needed. We trust everyone in the office, and being it an open-plan office, it's easy to see if someone is at someone else's desk when they're not supposed to be. Staff logoff and shutdown every night, so that's not an issue. But, it is a big issue when a staff member goes on leave, or even just on lunch and switch-off their cellphones and I can't get hold of them to get a password to login to a PC if I need to. The account PC, for that matter is encrypted, with no network access so one needs to be in front if it to access the data. User accounts also doesn't mean much to me. I know how it sounds, but I care more about the data than the user's account. As long as I can access whatever I want, whenever I want. -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532 _______________________________________________ CentOS mailing list CentOS(a)centos.org http://lists.centos.org/mailman/listinfo/centos

3 2

Storage Area Network
by Nastou Panagiotis 22 Jan '11

22 Jan '11

Hello, I have a Rocks cluster based on Centos 5.2. Can this Centos version support a Storage Area Network? What kind of software do I need for installing and managing it? Regards, Panos Nastou Dpt of Mathematics Aegean University Samos Island Greece

2 1

Xen; xm usb-add syntax - or - where is xm usb-attach
by aurfalien＠gmail.com 22 Jan '11

22 Jan '11

Hi all, I'm running Centos 5.5 with Xen 4.0.1 Would like to use a USB key (not a block device) in my domU. Dom0 lsusb yields; Bus 002 Device 004: ID 064f:0bd8 ABC-Systems AB CDE/FG xm usb-add shows; Usage: xm usb-add <domain> <[host:bus.addr] [host:vendor_id:product_id]> Not sure what combo will work in this case. However, I've read some notes regarding xm usb-attach. What subset of Xen do I need for this command to show? - aurf

2 4

CentOS and Dell MD3200i / MD3220i iSCSI w/ multipath
by Edward Morbius 22 Jan '11

22 Jan '11

We've been wrestling with this for ... rather longer than I'd care to admit. Host / initiator systems are a number of real and virtualized CentOS 5.5 boxes. Storage arrays / targets are Dell MD3220i storage arrays. CentOS is not a Dell-supported configuration, and we've had little helpful advice from Dell. There's been some amount of FUD in that Dell don't seem to know what Dell's own software installation (the md3 Dell doesn't seem to have much OS experience generally. Their docs are pretty inconsistent. I've noted omissions, terminology differences, and procedural differences among the "Owner's Manual", "Deployment Guide", a professional services "Remote Services Installation Agreement" service description. Some of the multipathing guidance we've had comes from their EqualLogic line of storage servers. Questions: 1: Is there anyone out there running this configuration and are you satisfied with it? 2: We get a set of error messages on the initator at target login. These appear to be benign, and web research suggests it's the result of a driver configuration issue in trying to send instructions to a http://comments.gmane.org/gmane.linux.iscsi.open-iscsi/5970 http://bit.ly/gguLl7 MD3000i boxes have 1 controller that can execute IO and one that cannot execute READ/WRITE IO until a special command is sent. In older kernels, layers like the partition scanning and udev and hal would send down IO to those disabled paths and we would see IO errors like in your link. In newer kernels we have device handler modules (for MD3000i you would want scsi_dh_rdac (so do "modprobe scsi_dh_rdac" and then lsmod to see if it is there)) that will detect if the path is not active and if so it will either not send the IO or it will not print a error message since we expect the IO to fail. We'd prefer *not* seeing spurious I/O errors that we don't have to sift through looking for real storage issues. 3: The MD32xxi series is a dual-controller array with multiple ports on each controller. Multiple targets can be logged into from an initiator, with the pathways aggregated by the Linux multipath (device-mapper-multipath) system. There's very little clear documentation on multipath. In particular, any way to trigger alerting from multipath events / failures, or iscsi session actions, would be helpful. The MD32xxi series only supports reporting from a GUI management utility (MDSM) which would be at best problematic to run in a server environment. The other question is: is multipathing typical of iSCSI configuation? Little of the iSCSI docs I've found discusses multipath configurations at all: http://www.open-iscsi.org/ http://www.cuddletech.com/articles/iscsi/index.html (good but very dated) http://www.cyberciti.biz/tips/rhel-centos-fedora-linux-iscsi-howto.html (no mention of multipathing) 4: Dell suggests a shutdown procedure including a flush of multipathing paths ("multipath -F" -- in the "Owner's Manual"): 3 Flush the Device Mapper multipath maps list to remove any old or modified mappings # multipath F Presumably this would go into one of the init scripts -- perhaps the /etc/init.d/multipath script, as part of the "stop" sequence (after the multipath daemon is killed). Anyone done this or know why the practice is recommended? Based on our experience with Dell I would NOT recommend this configuration for others. But we're stuck with it, and any help in getting things configured would be very helpful and gratefully received. I'm also hoping to get clearance to release docs we've generated, though that's the subject of some internal negotiation. -- Dr. Ed Morbius Chief Scientist Krell Power Systems Unlimited

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