auto set hostname for centos

autohostname

#! /bin/bash
#
# chkconfig: 2345 11 89

. /etc/init.d/functions

[ -x /sbin/ip ] || exit 1
[ "$EUID" != "0" ] && exit 4

case "$1" in
    start)
        case `hostname` in
            ""|localhost.localdomain)
            	ip=`/sbin/ip -4 -o route get 255.255.255.255 |\
                	/bin/grep -Eo 'src\s+\S+' |\
                	/bin/awk '{print $2}'`
                if [ -n "$ip" ]; then   
                    hostname "ip-`echo "$ip" | sed 's/\./-/g'`"
                    echo -n "Auto set hostname `hostname`"
                    success
                    echo
                fi
        esac
    ;;

    stop|status|restart|reload|force-reload)
        ;;
    *)
        echo $"Usage: $0 {start|stop|status|restart|reload|force-reload}"
        exit 2
esac

exit 0