I am trying to use dhcrealy on a CentOs 5 kernel which have kernel version 3.5.3. I configured /etc/sysconfig/dhcrelay file like that dhcrelay -i eth1 192.168.0.1 While dhcrealy is stopped, I run /etc/init.d/dhcrelay status and I get this output. Internet Systems Consortium DHCP Relay Agent V3.0.5-RedHat Copyright 2004-2006 Internet Systems Consortium. All rights reserved. For info, please visit http://www.isc.org/sw/dhcp/ Listening on LPF/eth1/08:00:27:49:5e:e7 Sending on LPF/eth1/08:00:27:49:5e:e7 Sending on Socket/fallback dhcrelay (pid 27536) is running… Then I [...]

I have a server that I am transferring data off of. We were having some problems that were traced back to the fact that the server is sending out jumbo size frames despite the fact that ifconfig is reporting that the MTU is 1500. How is this possible? The box is running CentOs 5, this is occuring over ipv4. How can I tell the server to stop sending out packets with sizes greater then 1500? [...]

I am trying to authenticate domain admins through apache and it is not working. Error i get is as follows [Mon Sep 24 14:54:45 2012] [debug] src/mod_auth_kerb.c(1432): [client 172.16.0.85] kerb_authenticate_user entered with user (NULL) and auth_type Kerberos [Mon Sep 24 14:54:45 2012] [debug] src/mod_auth_kerb.c(915): [client 172.16.0.85] Using HTTP/intranet.xxx.com@xxx.COM as server principal for password verification [Mon Sep 24 14:54:45 2012] [debug] src/mod_auth_kerb.c(655): [client 172.16.0.85] Trying to get TGT for user sharifu@xxx.COM [Mon Sep 24 14:54:45 2012] [...]

I have recently replaced a Fedora Core 3 server with one running CentOS 5 for the purposes of a mail relay in a DMZ. My problem is that when the server is sending messages to a particular remote organizaion, messages larger than 500KB don’t send properly. They seem to get hung up somewhere through the transmission, time out, then after the predictable retries, expire in the queue. Sendmail describes the problem as: MDeferred: Connection timed [...]

I have just setup my CentOS 5.8 64 [final] server as a webserver. Specs: 2x E5620 Intel CPU, DDR3 RAM, Hardware Adaptec RAID 10, 4x SAS drives. I have installed myself: Nginx PHP-FPM MySQL [ourdelta.org version] Sphinx Vsftpd Fail2ban Citadel [ddos flood protection] Munin NTP Htop Iptraf These are all things that I actively use to run my websites. Now my question: I found this article: http://www.vr.org/kb/1002/Optimize-and-disable-default-CentOS-services.html Which talks about a whole list of services [...]

I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high – see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.2%hi, 0.4%si, 0.0%st Mem: 6113256k total, 5949620k used, 163636k free, 398584k buffers Swap: 1048564k total, 104k used, 1048460k free, 3586468k cached After investigating if there is some method to have this flushed or cleared I stumbled upon a command which is: [...]

Our small company has rented a remote machine some 3 year ago. The machine is used as a company server, runs our email, web, source code repository, bugtracker, forum, wiki, etc. OS is linux CentOS 5.3, with Plesk 9.5 control pannel. I think both are too old. How complicated is to update CentOS to current version? What happens with Plesk in that case? Should Plesk be updated first? Or should we continue using CentOS 5.3? [...]

I’m running a php website. I have two servers. Please help me to check is this Mysql Database Server load too high? I found the mysql CPU usage is always higher than 100%. Any suggestions to optimize? I’m using CentOS release 5.8 Mysql 5.1.63-cll MySQL Community Server 4 Processors Intel Xeon 2.13G Total Memory: 4 G my.cnf myisam_sort_buffer_size = 64M thread_cache_size = 8 query_cache_size= 100M thread_concurrency = 4 max_connections = 600 max_user_connections=600 Asked by Don [...]

I’m having some problems with setting up my dns server on my vps (CentOs 5.8 32 bit) I have configured a dns zone with the ISPConfig 3 wizard. My name servers are registered at my domain registrar (at Yahoo) I configured my domain to use my name servers: ns1.mydomain.com ns2.mydomain.com Still, when I go to my domain, it says page not found. The real error is “can’t find domainname.com” named.conf (in /var/named/chroot/etc) // // Sample [...]

I am running centos version 5.4 with apache version 2.2.3, I want to get latest security patches for this apache version. I checked the last update for apache via rpm -q –changelog httpd | less and it shows Thu Mar 25 2010 Karanbir Singh <kbsingh@centos.org> 2.2.3-31.el5.centos.4 – Roll in CentOS Branding Thu Mar 04 2010 Joe Orton <jorton@redhat.com> – 2.2.3-31.4 – require and BR a version of OpenSSL with the secure reneg API (#567980) ……. [...]