A simple watchdog script

crontab

*/5 * * * * /root/bin/watchdog.sh redis:redis/redis-server.pid logbot logbot5000 logbot6000

watchdog.sh

#!/bin/sh

for ARG in $@; do
  # extract service name and pid file path
  NAME=`echo $ARG | cut -d":" -f1`
  PID_PATH=`echo $ARG | cut -d":" -f2`
  if [ "$NAME" = "$PID_PATH" ]; then
    PID_PATH="$PID_PATH.pid"
  fi
  # check service status
  CMD="service $NAME start"
  if [ -f "/var/run/$PID_PATH" ]; then
    PID=`cat /var/run/$PID_PATH`
    if [ ! -d "/proc/$PID" ]; then
      echo $CMD
      $CMD
    fi
  else
    echo $CMD
    $CMD
  fi
done