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PXE-Kernel crashes with "RAMDISK: incomplete write ..." after modifiying initrd.img
by Frank Thommen 27 Mar '09

27 Mar '09

Hi, to install current PC models (with new Intel NICs) via Kickstart/PXE, I wanted to add the newest e1000e-Treiber to initrd.img. With this modified image, the Kickstart kernel crashes with the following error messages: [...] md: Autodetecting RAID arrays. md: autorun ... md: ... autorun DONE. RAMDISK: Compressed image found at block 0 RAMDISK: incomplete write (20480 != 32768) 6062080 VFS: Cannot open root device "<NULL>" or unknown-block(253,3) Please append a correct "root=" boot option Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(253,3) To modify the initrd.img, I took the original CentOS 5.2 image, unpacked with cpio/gunzip and replaced modules/2.6.18-92.el5/x86_64/e1000e.ko with a current version. This driver module had been created on a freshly installed CentOS 5.2 host with kernel 2.6.18-92.el5 and w/o any updates. After adding the driver, I re-archived and re-packed the image and replaced the initrd.img on my tftp server. The new image is considerably bigger than the old one (12 MB vs. 5.7 MB) which puzzles me, as the driver file itself is 2.8 MB (compared to the old e1000e.ko with ca 170 KB) but the resulting modules.cgz is only around 700 KB bigger than the original one. All files have been compressed with `gzip -9`. My PXE bootsettings are: KERNEL CentOS-5.2_64/vmlinuz APPEND initrd=CentOS-5.2_64/initrd.img ramdisk_size=5940 kssendmac ks=http://srv/ks/ks.cgi noipv6 Even raising ramdisk_size doesn't help. At around ramdisk_size=7100 there seems to be an overflow and the size is recounted from zero (?). Any Ideas, how one can/should create an updated and working initrd.img for Kickstart/PXE? A similar question has been asked before on this list and a recommendation was to wait for 5.3. Unfortunately I cannot wait for the next release. Thanks in advance frank

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Re: [CentOS] CentOS VPN server for iPhone
by Bowie Bailey 27 Mar '09

27 Mar '09

Joseph L. Casale wrote: > > The non-standard port is a good trick, > > Here's just an opinion: Security by obscurity only > makes >you< feel good, it does nothing in reality. > Anyone sufficiently talented to hack a service in > order to gain root or do something useful would not > be fooled by that. Set whatever your doing up right > so that any false sense of security is not deemed > necessary. Changing port numbers will not stop a talented person who is intent on breaking into your network. However, it will stop (or at least slow down) the script-kiddies, worms, and others out there who are just scanning for misconfigured or unpatched applications. Switching SSH to a non-standard port completely emptied my log files of bad connection attempts. Now, if someone attempts to break in, it will be VERY obvious in the logs where before, it would have been buried in all of the other garbage. > Prevent weak passwords, possibly use connection throttling > etc etc. Of course. No one is suggesting that changing port numbers is all you need to do. It is just one more thing that you can do to slow down the attackers. -- Bowie

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Installing openmpi & lam for use with R
by Rick Bilonick 27 Mar '09

27 Mar '09

I am trying to install the R package "Rmpi" which needs libmpi. I've installed openmpi and lam in Centos 5.2: [root@rab45-1 /]# rpm -qv openmpi openmpi-1.2.5-5.el5 openmpi-1.2.5-5.el5 [root@rab45-1 /]# rpm -qv lam lam-7.1.2-14.el5 lam-7.1.2-14.el5 But I get the following error message when trying to install Rmpi: /usr/bin/ld: skipping incompatible /usr/lib/lam/lib/libmpi.so when searching for -lmpi I'm not sure what else to install/uninstall to fix this. Rick B.

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tar with -N option still picking up old files
by Neil Aggarwal 27 Mar '09

27 Mar '09

Hello: I tried this command to tar up a set of data files updated since yesterday (The data directory contains multiple files with varying dates): /bin/tar -z -c -N 2009-03-25 -f /tmp/test.tgz data When I look at the content of the test.tgz file, it looks like it copied the content of the entire directory, not just the newer files. I am on CentOS 5. Any ideas? Thanks, Neil -- Neil Aggarwal, (832)245-7314, www.JAMMConsulting.com Eliminate junk email and reclaim your inbox. Visit http://www.spammilter.com for details.

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manage different profile with a laptop
by MOKRANI Rachid 27 Mar '09

27 Mar '09

Hi, I need to use different profile with some linux CentOS laptops. - I need to connect the laptops at work with NIS, automount, DHCP .... - The same laptops can be use at home without NIS etc..but with personal wifi connection .... - The same laptops can be use in travel without network configuration Which best software to use to manage different profile ? Regards. __________________________ Ce message (et toutes ses pièces jointes éventuelles) est confidentiel et établi à l'intention exclusive de ses destinataires. Toute utilisation de ce message non conforme à sa destination, toute diffusion ou toute publication, totale ou partielle, est interdite, sauf autorisation expresse. L'IFP décline toute responsabilité au titre de ce message. This message and any attachments (the message) are confidential and intended solely for the addressees. Any unauthorised use or dissemination is prohibited. IFP should not be liable for this message. Visitez notre site Web / Visit our web site : http://www.ifp.fr __________________________

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Re: [CentOS] 64bit Python 32bit c library ...
by Mark Pryor 27 Mar '09

27 Mar '09

--- On Thu, 3/26/09, Ben <abnormaliti(a)clivepeeters.com.au> wrote: > From: Ben <abnormaliti(a)clivepeeters.com.au> > Subject: [CentOS] 64bit Python 32bit c library ... > To: "CentOS mailing list" <centos(a)centos.org> > Date: Thursday, March 26, 2009, 10:48 PM > > -----Inline Attachment Follows----- > > I have a closed-source 32bit > database application running on a 64bit > CentOS 5.2 system which is running very well however i am > looking at > developing some python applications that require access to > the data and > the vendor only provides a 32bit c library. > > So while attempting to utilize the library in python with > ctypes it > became obvious that the 64bit python cannot use the 32bit c > library. > > So what are my choices? > Yum and so many of the applets (system-config-*) are tied to Python that you can't mess with the base version or arch of Python. What about a 32 bit chroot using Mock? I've never done it, but that's what Mock is intended to do. Perl.i386 will run OK in x86_64 and there is a version of perl-Inline-CPP that will allow you to write most of what you want in CPP and wrap it with Perl. -- Mark

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64bit Python 32bit c library ...
by Ben 27 Mar '09

27 Mar '09

I have a closed-source 32bit database application running on a 64bit CentOS 5.2 system which is running very well however i am looking at developing some python applications that require access to the data and the vendor only provides a 32bit c library. So while attempting to utilize the library in python with ctypes it became obvious that the 64bit python cannot use the 32bit c library. So what are my choices? 1. is there a way to use the 32bit library in 64bit python i haven't found? 2. install 32bit python on the 64bit system. 'yum list python.i386' shows that 32bit python is not available. 3. manually compile and install 32bit python and _ALL_ its libraries under /opt. has someone already done this? are the RPMs available? let me just say that i am no python expert, yet, so bare with me. Any help would be appreciated. Ben

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mirrorlist.centos.org offline? NO A RECORD IN DNS
by Danny.Terweij 27 Mar '09

27 Mar '09

Is mirrorlist.centos.org out of the air? because there is no A record for it. Which causes yum to fail. Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=x86_64&repo=os error was [Errno 4] IOError: <urlopen error (-2, 'Name or service not known')> Error: Cannot find a valid baseurl for repo: base Danny.

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[OT] Network switches
by Scott McClanahan 27 Mar '09

27 Mar '09

I'm looking to acquire a few new core switches for our network which would be a major upgrade from the cheap unmanaged things we currently have. Basically, just users, servers, and other simple network devices will be plugged into them but I'd like to start doing some testing with iSCSI for various non-production reasons. I have no allegiance to a particular vendor although I do have a Cisco background. I'd like them to be at least 10/100/1000 (no need for power over ethernet) and include many of the features that are most important to me in a managed switch, including: * vlans * mstp or some well established form of per vlan spanning tree * acl's * port mirroring or what cisco calls span sessions * snmp * ssh enabled remote management * support w/ updates and bugfixes I need at least 48 ports per device and obviously would like them to be "fast". Most importantly, I'd like to know what you guys prefer as operations dudes and what pitfalls to avoid. Also, are there other features you folks would demand to have in your switches that I haven't mentioned? I can provide more information if you'd like. Thanks. Oh, cost is sort of an issue (small/medium sized business) but right now insight from you guys is what's important and I can work out the cost issue later. Thanks again.

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Dell 120 GB 5400 RPM Encrypted Serial ATA Hard Drive
by Agile Aspect 26 Mar '09

26 Mar '09

Hi - I've been asked to re-partition a Dell 120 GB 5400 RPM Encrypted Serial ATA Hard Drive and install CentOS 5 on the new partition. It's a Dell Lattitude E5400 laptop. Is this even possible with encrypted drives? Does CentOS 5 need special drivers? Any help would be greatly appreciated. -- Agile -- Article. VI. Clause 3 of the constitution of the United States states: "The Senators and Representatives before mentioned, and the Members of the several State Legislatures, and all executive and judicial Officers, both of the United States and of the several States, shall be bound by Oath or Affirmation, to support this Constitution; but no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States."

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