プロセス数がMaxClientsに貼り付いたら自動的にApacheを再起動する

/opt/restart_hanged_http.sh

#!/bin/sh
WAIT=10
PROC_MAX=250
RESTART_INTERVAL=60
TIMESTAMP_FILE=/tmp/restart_hanged_http
SCRIPT_PATH=`echo $(cd $(dirname $0);pwd)`

cd ${SCRIPT_PATH}
if [ -f ${TIMESTAMP_FILE} ]; then
  if [ `find ${TIMESTAMP_FILE} -cmin +${RESTART_INTERVAL} | wc -l` -gt 0 ]; then
    rm -f ${TIMESTAMP_FILE};
  fi
fi

if [ `ps auxww | grep httpd | wc -l` -gt ${PROC_MAX} ]; then
  sleep ${WAIT}
  if [ `ps auxww | grep httpd | wc -l` -gt ${PROC_MAX} ]; then
    if [ ! -f "${TIMESTAMP_FILE}" ]; then
      touch "${TIMESTAMP_FILE}"
      /sbin/service httpd restart
    fi
  fi
fi

２分おきにcron実行

*/2 * * * * /bin/sh /opt/restart_hanged_http.sh > /tmp/restart_hanged_http.log 2>1&