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wireless
by David 19 Oct '10

19 Oct '10

Hi folks I have a CentOS box with 2 network cards. One is eth0 and the other is wlan0 (Linksys WUSB54GC USB wifi card) I use wlan0 to stay linked with other workstations in an small network and eth0 just in case I need to get wired to solve some problem. eth0 is always unpluged while things are going ok. Te problem is everytime my AP is turned off for whatever reason or the link is down, no matter the AP is working again, my wlan0 stays without link. Then I have to reboot to get wireless linked again. I'm not running Network Manager, For some reason, everytime I tried to start it, it just mess my network, trying to make wlan0 to get an IP from a DHCP server, no matter wlan0 have it's own IP address specified in ifcfg-wlan0. The Centos Box is unattended and everytime it happens I have to go to the other room and press the on/off button to restart it. (no display, keyboard or mouse in it) Any advices? How could I make NetworkManager to just link it again and not start messing with my network configuration? Cheers David

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best practices in using shared storage for XEN Virtual Machines and auto-failover?
by Rudi Ahlers 19 Oct '10

19 Oct '10

Hi all, Can anyone pleas tell me what would be best practice to use shared storage with virtual machines, especially when it involved high availability / automated failover between 2 XEN servers? i.e. if I setup 2x identical XEN servers, each with say 16GB RAM, 4x 1GB NIC's, etc. Then I need the xen domU's to auto failover between the 2 servers if either goes down (hardware failure / overload / kernel updates / etc). What is the best way to connect a NAS / SAN to these 2 servers for this kind of setup to work flawlessly? The NAS can export iSCSI, NFS, SMB, etc. I'm sure I could even use ATAOE if needed -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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exim quota
by Helmut Drodofsky 19 Oct '10

19 Oct '10

exim quota uses 32 bit integer: maximum mail store quota must be less than 2GB. Is there an repository with exim compiled with Size of off_t: 8 instead Size of off_t: 4 Comments in discussion groups say, the version compiled with "Size of off_t: 8" accepts lager quota. Helmut

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Not receiving mail
by Dotan Cohen 18 Oct '10

18 Oct '10

I have installed Postfix, Dovecot, and Squirrelmail on a CentOS 5.5 machine. In Squirrelmail a user can send mail, but he is not receiving replies. There is nothing relevant in the maillog other than the user's (successful) login attempts. I am at loss, I have been following tutorials such as the Perfect Server [1] series and other Google results, but I cannot get this thing to receive mail. What should I be checking? Thanks! [1] http://www.howtoforge.com/perfect-server-centos-5.5-x86_64-ispconfig-2 -- Dotan Cohen http://gibberish.co.il http://what-is-what.com

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Password Expiry
by Manish Kathuria 18 Oct '10

18 Oct '10

Hello, Is there any command / option available on CentOS to expire a user's password immediately ? I remember using "passwd -e" on some other distribution but the -e option does not seem to be present on CentOS 5.x. Thanks, Manish

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qemu-kvm segfaults on starting guests
by Negative 18 Oct '10

18 Oct '10

I have a Centos 5.5 on an AMD 64 system (Athlon II x2 250). I caught up on updates today, including -- kernel 2.6.18-194.17.1.el5 -- glibc 2.5-49.el5_5.5.i686 I have several guests that were working before the update, but now none of them will boot. With each attempt I get a message in /var/log/messages: -- kernel: qemu-kvm[xx]: segfault at 000000379fc0da11 rip 00002b9f2732283f rsp 00000000446a6e80 error 7 Has this happened to others? Any fix. I see similar bugreports, but they are not recent, and not quite like this. The closest thing I can find was on an nvidia list about vmware posted today -- so maybe this has something to do with needing to rebuild the nvidia drivers with every kernel update. Any ideas?

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escape .c files to html code with bash how?
by Jozsef Vadkan 18 Oct '10

18 Oct '10

i need to encode .c files to html, like on this website: http://centricle.com/tools/html-entities/ i tried to write a bash script for it: http://pastebin.com/raw.php?i=mZKAw4c5 but it's not working very well :D does anyone has a script, that does this? thank you :\

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using a Laptop as a KVM console?
by Rudi Ahlers 18 Oct '10

18 Oct '10

Hi all, Has anyone seen something like this before: I want to use a laptop as a KVM console. Basically when a technician goes to one of our datacentres, or clients he has to look for a free LCD, keyboard & mouse to connect to a server (no network access, reinstall, troubleshoot failed kernel / HDD, etc). And then hopefully there's an open power socker in that cabinet. So I'm thinking why not just use a laptop instead? It already has an LCD, keyboard, mouse & power. Surely someone has, or may still, build something that could connect to the laptop's USB port(s) and then to the server's VGA & USB / PS2 ports, then act as a KVM? -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

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Re: [CentOS] yum list updates error (Manish Kathuria)
by Ritika Garg 18 Oct '10

18 Oct '10

There was no proxy in the file /etc/yum.conf. I specified the proxy setting and now "yum list updates" is working. A part of the output was: Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: centos.01link.hk * updates: centos.01link.hk * addons: centos.01link.hk * extras: centos.01link.hk Updated Packages ImageMagick.i386 6.2.8.0-4.el5_5.2 updates ImageMagick.x86_64 6.2.8.0-4.el5_5.2 updates NetworkManager.i386 1:0.7.0-10.el5_5.1 updates Its written Updated Packages. Does this mean it has already updated? I thought that this command displays packages that need to be updated.

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iptables: comprehensive tutorial for CentOS?
by Boris Epstein 18 Oct '10

18 Oct '10

Hello listmates, I know this may sound stupid... but I am trying to set up a firewall/filter/forwarder using CentOS 5.5 machine as a platform and I am succeeding but only partially. Fro example, I am literally trying to forward HTTP and HTTPS (TCP 80 and 443) from the public interface to a private IP and TCP 80 works like a charm whereas TCP 443 seems to be a no-go. To that effect: does anyone know of a comprehensive relevant manual? I mean, I must be doing something wrong here though I ain't sure what. Any advice and suggestions much appreciated. Boris.

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