Server – VPS – Web Hosting Info
How to rebuild the RPM database for Linux Centos 5
Mar 27th
Had problems with our RPMs and our sys-admin Tim Hass came up with the perfect answer ! First of all You just need to be sure that no rpm processes are running!
Then delete /var/lib/rpm/__db.*
and then run the command:
rpm –rebuilddb -vv
Nice one 
Thanks Tim
Egrep – Helpful linux command reference
Mar 26th
While many people use the grep command through a pipe | there are more efficient ways of using it. I have nearly killed a server on many occasions by running cat filename |grep some-term while the command tries to list a huge file. Instead simply use egrep which is more efficient in terms of speed and system resources.
DDOS check via number of connections
Mar 26th
A quick and usefull command for checking if a server is under DDOS is
That will list the IPs taking the most amount of connections to a server. It is important to remember that the ddos is becoming more sophistcated and they are using fewer connections with more attacking ips. If this is the case you will still get low number of connections even while you are under a DDOS.
