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RH Server/Client disk sets -> Centos; how?
by Paul Johnson 21 Oct '09

21 Oct '09

I'm running Centos on 12 machines. Colleague runs Redhat Enterprise Linux and while studying his system, I see some gibberish/complication about his system being a "Client" install, not a "Server" install. Apparently, RH provides completely different disk sets for Server and Client installs. I've gone to the RH website and read about the difference between Client and Server, but I still don't understand why they make 2 different disks. In the "old days" of RH, there would be 1 set of disks, and when the install began, you would choose "server" or "workstation" as a way of choosing a default set of packages, and then you could freely pick and choose additional things. You could install gnome on a server, or an http server on a client. Centos seems to follow the good old RH packaging approach. This RHEL Client/Server thing actually causes some wrinkles if you try to transition a running system from RH to Centos, because the repository names are different. RH will have a version name like "5client" whereas Centos will just have 5. I understand this Centos list is not quite the right place to ask "why does RedHat do that?", but I bet some of you will know. What I really want to ask here is: what is the relationship between the several RHEL install types and the Centos disks? Does Centos collect up all the SRPM/RPM packages from both RHEL Client and Server? -- Paul E. Johnson Professor, Political Science 1541 Lilac Lane, Room 504 University of Kansas

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Calling all Hackers
by DTS-Corp (Knowledgebase) 21 Oct '09

21 Oct '09

Hey guys. I have a server that is owned by me and can confirm through servint that it is owned by me. I would like to do a penetration test and of course to allow you to upload files on the server and kind of trash it to the point where it is always restarting and running out of memory etc etc. This is going to be mainly script kiddie stuff, however will be able to get you hired on with me for some other jobs that are invovlving network security evaluations. Here is the server info Cpanel and WHM running on CentOS hostname level1.ixkt.net IP addresses 64..131.81.30 64.131.81.31 64.131.81.32 64.131.81.30 SSH Port is on 3734

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Karanbir's disks (was: openfiler )
by Alan McKay 21 Oct '09

21 Oct '09

On Tue, Oct 20, 2009 at 6:14 PM, Karanbir Singh <mail-lists(a)karan.org> wrote: > I have this running in production. only not with 2 machines, but with 4 > machines, doing raid-10 ( not mdraid10, but conventional 2 sets of > raid-1's 0'd ) Can you give more detail on what you've got there? Sounds interesting. -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

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Created a DVD from Gnome Desktop -CentOS-5.3
by James B. Byrne 21 Oct '09

21 Oct '09

I am trying to put the dvd iso image of CentOS-5.4 onto a DVD. I have an LG multi-writer installed. I have used this device on this host to created CDs in the past but this is my first attempt at creating a dvd. When I put a blank DVD-R media in the drive then I see a desktop icon for "CD-ROM Disc" created. When I open the bittorent folder and click on the iso image "CentOS-5.4-x86_64-bin-DVD.iso" then I am prompted to open the image with "CD/DVD Creator". When I do this then I get a new window opened with the image file in the lower portion and an entry at the top labelled: CD/DVS Creator Folder and a button labled "Write to Disc" When I click on write to disc I am prompted to either create from image or create from file. I select image and am propted for the speed. I select maximum possible (the default) and press the write button. I get this error: Insert a rewritable or blank disc Please put a disc, with at least 4.3 GiB free, into the drive. The following disc types are supported: DVD+R DL, DVD-RAM, DVD-R, DVD-RW, DVD+R, DVD+RW I get the same thing if I use a DVD-RAM. What is going on? I have used the same model dvd writer on a MSWindows stations and have created readible dvds therefrom. Any ideas on how to proceed? -- *** 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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Re: [CentOS] using Linux as a NAS / SAN device
by J.Witvliet＠MINDEF.NL 20 Oct '09

20 Oct '09

Hi, -----Original Message----- From: centos-bounces(a)centos.org [mailto:centos-bounces@centos.org] On Behalf Of Robert Heller Sent: Friday, August 28, 2009 12:23 AM To: CentOS mailing list Cc: CentOS mailing list Subject: Re: [CentOS] using Linux as a NAS / SAN device At Fri, 28 Aug 2009 00:12:27 +0200 CentOS mailing list <centos(a)centos.org> wrote: > > Hi, > > I'm looking at using Linux as a NAS / SAN device, and would like some > input from other's who have done this before? > > How would it compare to commercial SAN devices, Thecus N8800SAS > (http://www.thecus.com/products_over.php?cid=11&pid=177&set_language=e > nglish) > or something similar to these? > > I would probably use hardware RAID 10, and could go with either SAS / > SATA, and then probably offer iSCSI, Samba. NFS & rsync. > In terms of servers hardware, well either Tyan / SuperMicro / Intel / > Dell would be fine as well. But, my question is rather from a linux > point of view, how would Linux compare to dedicated NAS devices, in > terms of the OS managing the device? I think many dedicated NAS devices, are in fact Linux machines, using an embedded Linux system. -- Just a word of caution. I had a simarly question: building one self, or buyding dedicated hw. Looked through several specs of different boxes, and decided for an ICY-box, that can hold two sata-disks, raid0/raid1/jbod, has an GB-ethernet interface and capable of doing NFS. (which is actually an Linux-box) However, the box is as slow as a proverbial civil-servant, although the link is realy set to GB, it just might as well have been 100MB. And even that its not capable of filling to the max. (60Mb) Found out (afterwards ;-) on the relevant product mailing lists that it's the max the box can do. hans ______________________________________________________________________ Dit bericht kan informatie bevatten die niet voor u is bestemd. Indien u niet de geadresseerde bent of dit bericht abusievelijk aan u is toegezonden, wordt u verzocht dat aan de afzender te melden en het bericht te verwijderen. De Staat aanvaardt geen aansprakelijkheid voor schade, van welke aard ook, die verband houdt met risico's verbonden aan het elektronisch verzenden van berichten. This message may contain information that is not intended for you. If you are not the addressee or if this message was sent to you by mistake, you are requested to inform the sender and delete the message. The State accepts no liability for damage of any kind resulting from the risks inherent in the electronic transmission of messages.

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iptables question
by Bowie Bailey 20 Oct '09

20 Oct '09

The logs on my mail server are filling up with this kind of thing: Oct 19 17:03:51 bnofmail kernel: REJECT: IN=eth0 OUT= MAC=XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX SRC=195.140.240.6 DST=XX.XX.XX.XX LEN=189 TOS=0x00 PREC=0x00 TTL=52 ID=6284 DF PROTO=TCP SPT=25 DPT=32776 WINDOW=65535 RES=0x00 ACK PSH URGP=0 The source port is always 25 and the destination is a high-numbered port. The destination address is the private IP of the server. These seem to be related to outgoing email connections based on the source IPs, but I don't know why they are not part of an established connection. The mail server seems to be running just fine regardless of these blocked connections. Any ideas? -- Bowie

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Openfiler question - fiber channel?
by Alan McKay 20 Oct '09

20 Oct '09

Hey folks, I don't seem to be able to get a response from the openfiler forums (and they want 40 quid for the fine manual!), and since there has been a lot of chat about it here lately, I figured I'd ask here. Please forgive my terminology as I am just making my first baby steps into iSCSI and Fiber Channel, and am not very well read on the matters. So I could be using the wrong terms (anyone got a good primer to recommend?) It seems straightforward that I can install openfiler to server iSCSI disks out over the network. And it seems obvious to me that I'd want a dedicated network for doing that. That part is easy. But based on some poking around on the openfiler site and in the forums, it looks to me like it might be possible to stick a fiber channel card into an openfiler system, and serve fiberchannel out to other systems? Is that right? Is anyone here doing this? This does tie back in to CentOS directly because most of my systems are CentOS, and I'd eventually like to migrate them in this direction, depending on what comes of my benchmarking thanks, -Alan -- “Don't eat anything you've ever seen advertised on TV” - Michael Pollan, author of "In Defense of Food"

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centos5.4 and freenx - using my home dir and settings
by Ryan Pugatch 20 Oct '09

20 Oct '09

Hello all, I am setting up freenx on a machine and I am able to connect to it remotely. However, when I connect and start xfce it does not appear to use the correct settings. It acts like it is a whole different user. It is starting the desktop environment as the nx user rather than myself. Is there any way to have the NX server connect as myself rather than having a whole separate virtual environment? I know you can't connect to an existing X session that wasn't started with FreeNX, but I want to be able to start a session using my settings and have access to my home dir, etc. Thanks, Ryan

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VMware Server 2.0.1 and Centos 5.4
by Ben Mohilef 20 Oct '09

20 Oct '09

Upgrade to RHEL 5.4's glibc has rendered vmware-hostd inoperable in some systems. I don't know if Centos 5.4 has the same conflict between glibc and VMware Server as RHEL (no reason it shouldn't). If you run VMware Server 2.0.1 make a copy of /lib64/libc-2.5.so (or /lib/libc- 2.5.so) before upgrading to 5.4. If you encounter this problem follow dirkgf 's instructions in http://communities.vmware.com/thread/229957 from which I quote: > > Re: vmware-hostd crashes repeatedly after upgrade to RHEL 5.4 Sep 5, > 2009 7:49 AM > > just for reference in case somebody else is having this issue. We seem to have > been able to resolve the problem for us. Following the steps we performed. > > * Log on to your VMware host. > * Create the directory /usr/lib/vmware/lib/libc.so.6 > * Log on to an RHEL 5.3. machine. Grab /lib64/libc-2.5.so (or > /lib/libc-2.5.so in case you're running an 32 Bit host) and copy it to the > VMware host into /usr/lib/vmware/lib/libc.so.6 > * Rename the file libc-2.5.so within /usr/lib/vmware/lib/libc.so.6 to > libc.so.6 * Open /usr/sbin/vmware-hostd and add > /usr/lib/vmware/lib/libc.so.6 to the LD_LIBRARY_PATH. I just added an > "export LD_LIBRARY_PATH=/usr/lib/vmware/lib/libc.so.6:$LD_LIBRARY_PATH" > before the last line. * Restart your vmware services (or just the host) > > > Downgrading libc might be also an option, but I'd like to keep the host > unchanged other Works for me on a x86_64 system which exhibited similar symptoms. I agree with his last line because I don't know what else retaining the old glibc wold break. regards, benm

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Monitoring a remote server with Conky ?
by Niki Kovacs 20 Oct '09

20 Oct '09

Hi, I've been using Conky for some time, a nifty utility to monitor just about anything on the PC. Vital things like CPU, RAM, swap, disks, current song playing in MPD :o) Here's what it looks like : http://www.microlinux.fr/images/bureau_conky.png And with more detail : http://www.microlinux.fr/images/conky_zoom.png Now I wonder... I'd really like to use that to monitor my remote server. I know this feature isn't officially supported by Conky, but I'm right now thinking about a workaround. Something like: OK, my server is 'headless' (e. g.: no graphical server, nothing), but why not install just xorg-x11-server-Xorg, then use Conky and forward it to my local display with SSH -X ? I'm pondering this question, thinking about the possible issues... ... so maybe one of you guys here has come up with some solution ? Cheers, Niki

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