I use this script on a cpanel server..if output of pgrep command is 0 then the $restart command is issued

#!/bin/bash
restart=”/scripts/restartsrv_httpd”
pgrep httpd || $restart
exit 0

If its a VPS then I might add to clear the Semaphore Arrays.

for i in `ipcs -s | grep nobody | awk ‘{print $2}’`; do ipcrm -s $i; done

Then I put this script into Cron to run every 5 minutes.

# MIN HOUR DAYOFMONTH MONTH DAYOFWEEK COMMAND
*/5 * * * * /root/checkhttp.sh