お名前VPSがプロセスを勝手にKILLしてくれるのでcronで簡易プロセス監視

proc_check.sh

#!/bin/bash

SERVICES=('zabbix_agentd' 'sshd' 'denyhosts' 'httpd' 'mysqld' 'postfix' 'amavisd')

for service in ${SERVICES[@]}; do
    proc_count=`ps ax | grep -v 'grep' | grep -c "$service" 2>/dev/null`
    if [ $proc_count -eq 0 ]; then
       echo "start ${service}..."
       /etc/init.d/${service} start
    fi;
done