Monitor and Restart Processes

monit can be used to monitor and restart server processes such as apache. See the link below for more info:

Monitor and restart Apache or lighttpd webserver when daemon is killed

RHEL and CentOS monit rpm can be downloaded here. Install on CentOs:

# rpm -Uvh monit-4.10.1-7.el5.i386.rpm
# vi /etc/monit.conf
# chkconfig --level 345 monit on
# /etc/init.d/monit start