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34758 discussions

Iptables and impersonating another O/S
by Tom Laramee 07 Jan '08

07 Jan '08

i have a CentOS 5.1 server running sshd (exposed to the outside world). i'd like to use iptables to fool nmap into thinking i'm running another O/S. e.g.: iptables -t mangle -A PREROUTING -d 192.168.0.64 -j PERS \ --tweak dst --local --conf /etc/personalities/macos9.conf iptables -t mangle -A OUTPUT -d 192.168.0.64 -j PERS \ --tweak src --local --conf /etc/personalities/macos9.conf all of the tutorials on iptables i've found take me through steps that involve a kernel recompile ... do i really need to do this? is there a tutorial that provides a somewhat large degree of detail on how to do what i'm interested in doing? i haven't compiled a kernel in approx. a decade (slackware). of course, i'd like to avoid the kernel recompile if possible. thanks --tom

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mounting & partitioning Seagate FreeAgent external HD
by Tim McGeary 06 Jan '08

06 Jan '08

Hi all, As a disclaimer, I'm new to this list and very green administering CentOS. I run it on my test servers and do very basic networking and server administration (most users, permissions, and web app stuff). I have a backup server that I am using rsync to collect important in-process file for our digital library from both Windows and Linux servers, as well as a specific applications which are updated on a separate test server. This backup server ran out of space and I have no more internal slots available to add another disk, so I bought a 750 GB Seagate FreeAgent external USB hard drive. I've seen some various issues out there about how Seagate FA HDs go into sleep mode when used in the manner I want to, but all of the people posting about that seemed to be able to mount theirs with no problem. I can see the device in my /proc/bus/usb/devices file, but fdisk -l doesn't show it at all. I was trying to mount and partition it using Webmin, but I can't figure out the device name I need to give it to mount and partition it. How is the best way to figure that out? This particular server is running CentOS 4. Thanks, Tim -- Tim McGeary Senior Systems Specialist Lehigh University 610-758-4998 tim.mcgeary(a)lehigh.edu Google Talk: timmcgeary

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I am confused. Chmod / chown issues?
by Jason Pyeron 06 Jan '08

06 Jan '08

Where did I go wrong? [root@mail busdev]# stat . File: `.' Size: 4096 Blocks: 16 IO Block: 32768 Directory Device: ah/10d Inode: 147591 Links: 5 Access: (0750/drwxr-x---) Uid: (56755/ busdev) Gid: (56755/ busdev) Access: 2008-01-06 15:49:53.000000000 -0500 Modify: 2008-01-06 15:49:15.000000000 -0500 Change: 2008-01-06 15:59:59.000000000 -0500 [root@mail busdev]# grep ^jpyeron: /etc/group && grep ^busdev: /etc/group jpyeron:x:500: busdev:x:56755:jpyeron [root@mail busdev]# su jpyeron [jpyeron@mail busdev]$ ls -al ls: .: Permission denied [jpyeron@mail busdev]$ exit [root@mail busdev]# uname -r 2.4.21-37.EL [root@mail busdev]# -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- - - - Jason Pyeron PD Inc. http://www.pdinc.us - - Sr. Consultant 10 West 24th Street #100 - - +1 (443) 269-1555 x333 Baltimore, Maryland 21218 - - - -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- This message is for the designated recipient only and may contain privileged, proprietary, or otherwise private information. If you have received it in error, purge the message from your system and notify the sender immediately. Any other use of the email by you is prohibited.

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Long time waiting on boot
by Robert Moskowitz 06 Jan '08

06 Jan '08

I just installed Centos 5.1 with XEN on my HP nc2400 duo core and there are two problems out the starting gate: Oh, I am booting off a 40Gb 2.5" drive on a USB adapter. The internal hard drive is encrypted and not usable right now (until I get XEN figured out). But I don't think it has a bearing... The system hangs for some reason at various points. When first starting up graphic (you know, when the screen goes from character mode to graphic and you can then follow the boot by pressing <alt-D>. When bringing up loopback When bringing up eth0 (dhcp server very reachable) When starting mcstransd (whatever that is) When starting system message bus When starting some bluetooth service (the first boot but not after the yum update) When starting Avahi deamon (timeout out and failed during this long wait, I should turn that service off anyway) When starting HAL (the first boot but not after the yum update) Each hangup is a few minutes! Then the system continues. I did not see anything of note in /var/log Second issue, the external video. I cannot not turn it on. This HP notebook does not offer any BIOD control of the external monitor. There is a 'presentation' button right above the keyboard you are suppose to press to toggle the external video. It does nothing. Well I do hear the drive spinning so the system is trying something? I should point out that my XP boot off the internal harddrive sometimes 'looses' the external video, and I have to go into display control and turn off then on the 'presentation' option. This could work out GREAT if I can get a few more things working (and learn XEN to boot the XP in a window).

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SOLVED: [CentOS] Skype Public Key - How to install PGP Public Key in CentOS5, from alternate site that I have in web browser?
by Lanny Marcus 06 Jan '08

06 Jan '08

On Sunday, 06 January 2008, Akemi Yagi wrote: <snip> > Question: What rpm > command do I use, to Import the Public Key that's in the browser > window? Or, if I need more than one command, what are they? You should wget that file and run the rpm command as instructed in that wiki. Akemi: Having the proper command did the trick! Thanks a million! It's installed. :-) Lanny

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Re: [CentOS] Skype Public Key - How to install PGP Public Key in CentOS5, from alternate site that I have in web browser?
by Lanny Marcus 06 Jan '08

06 Jan '08

[CentOS] Skype Public Key - How to install PGP Public Key in CentOS5, from alternate site that I have in web browser? On Sunday, January 6, 2008, Akemi Yagi wrote: <snip> Question: What rpm > command do I use, to Import the Public Key that's in the browser > window? Or, if I need more than one command, what are they? You should wget that file and run the rpm command as instructed in that wiki. Akemi: Thank you! I will try that now! I get the Digest version of the ML, and I checked on the CentOS web site, to be sure my question got to the ML OK. I couldn't believe that you answered me so quickly! :-) Your help is *always* greatly appreciated! Lanny

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Skype Public Key - How to install PGP Public Key in CentOS5, from alternate site that I have in web browser?
by Lanny Marcus 06 Jan '08

06 Jan '08

Hello: A simple question: On this Wiki page: http://wiki.centos.org/HowTos/Skype it says that the normal method for the Public Key isn't working. I copied the URL for the alternate key location http://gd.tuwien.ac.at/infosys/phone/skype/rpm-public-key.asc into the browser and I get a PGP Public Key. Question: What rpm command do I use, to Import the Public Key that's in the browser window? Or, if I need more than one command, what are they? >warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID d66b746e >Public key for skype-2.0.0.27-centos.i586.rpm is not installed TIA and Happy New Year! -- Lanny --------------------------------------------------------- Over 800 Magazine titles up to 85% off http://lowcostmagazines.com/

2 1

Mail server setup for small ISP
by Ugo Bellavance 06 Jan '08

06 Jan '08

Hi, I will probably have to design an e-mail (and other components) infrastructure for a small ISP soon (WISP). I'm doing some research to determine which components would be best to offer e-mail services to their client and allow the staff to manage accounts easily. I usually use virtual machines a lot for isolation and easy backups and migration (when a hardware node is underpowered, it is easy to migrate one or more virtual machines to another hardware node easily). I have looked at iSCSI and drbd for high-availability of the storage: http://www.pcpro.co.uk/realworld/82284/san-on-the-cheap/page1.html. This looks like it should be doing a great job of high availability storage. For mail server, I guess I should look at an MTA and IMAP/POP server that supports LDAP and/or MySQL for users. Postfix should be a good choice for MTA, as I know it (at least a little, but I know sendmail better). For IMAP/POP, I'm not sure... Would dovecot be sufficient, or should I try cyrus. I'd rather use components that are available for base or extras repository (or rpmforge). I think that squirrelmail and horde would do a good job for webmail. There shoudn't be any troubles having some redundancy for DNS, web servers, mtas, but what about IMAP/POP? linux-HA? MySQL replication should be enough, I guess. Or maybe linux-HA as well. I wonder if I should add GFS to the mix to have multiple IMAP/POP servers use the same storage. Or maybe IMAP proxies? Any insights welcome :). Ugo

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Some repo fancy footwork?
by Robert Moskowitz 06 Jan '08

06 Jan '08

I am looking at K12LTSP-EL5 which is Centos 5 based. Supposedly their disc2 maps to Centos 1of6 and so forth. I have a repo of the Centos 5.1 isos: /centos/5/os/i386 The question is can I put the K12LTSP disc 1 in a directory: /centos/k12ltsp-el5/i386 then with some logical link magic make this directory appear to have all 7 CDs worth of content? Or put the k12 disc 1 somewhere else and do 2 logicla mappings into one directory?

1 0

Which RPM of Hylafax+ should I use?
by Robert Moskowitz 06 Jan '08

06 Jan '08

I want to install Hylafax+, IAXmodem, and T38modem on my Trixbox 2.4 which is built on Centos 5.1 ("vmlinuz-2.6.18-53.1.4.el5"). Over at http://sourceforge.net/project/showfiles.php?group_id=148904 there are Hylafax+ rpms for: Fedora 7,8 Fedora Core 2,5,6 Redhat 7,9 I **think** Fedora Core 6? IAXmodem is only available in source at http://sourceforge.net/project/showfiles.php?group_id=148814 (TB only has it an rpm for Centos 4.x). So if anyone knows of an rpm of iaxmodem 1.0 for Centos 5.... And T38modem is a real challenge to find....

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