监控memcached进程启动与否的shell脚本

一例用于监控memcached进程是否启动的shell脚本，用于memcache的启动、停止与重启等操作。

1，memcached_inc.sh 设置路径，端口等讯息。
代码：

复制代码代码示例:

	#!/bin/sh  

	#config include  

	HOST=$(hostname)  

	SITE="mysite"  

	PORT=11211  

	MEMCACHED_PID_FILE="/tmp/memcached.pid"  

	MEMCACHED_DAEMON_PID_FILE="/tmp/memcached_daemon.pid"  

	MEMCACHED="memcached -d -m 64 -p $PORT -u memcache -l 127.0.0.1 -P $MEMCACHED_PID_FILE"  

	MEMCACHED_DAEMON_FILE="memcached_daemon.sh"  

	ERROR_LOG_FILE="${ROOT}/memcached_${SITE}_${HOST}_${PORT}.log"

2，gm_memcached.sh 控制memcached 启动，停止，重启。

复制代码代码示例:

#!/bin/sh
# site: www.jbxue.com
#memcached start and stop
#$1 action

ROOT=$(cd "$(dirname "$0")"; pwd)
. ${ROOT}/memcached_inc.sh

start() {
    if [ -f "$MEMCACHED_PID_FILE" ] && [ -s "$MEMCACHED_PID_FILE" ]; then
        printf "memcached already running\n"
    else
        printf "starting memcached\n"
        $MEMCACHED

        sleep 2

        PID=$(cat $MEMCACHED_PID_FILE)
        printf "memcached is started PID:$PID\n"

        printf "starting memcached daemon\n"
        ${ROOT}/${MEMCACHED_DAEMON_FILE} &
        DAEMON_PID=$!
        echo ${DAEMON_PID} > ${MEMCACHED_DAEMON_PID_FILE}
        printf "memcached daemon is started PID:${DAEMON_PID}\n"
    fi
}

stop() {
    if [ -f "$MEMCACHED_DAEMON_PID_FILE" ] && [ -s "$MEMCACHED_DAEMON_PID_FILE" ]; then
        DAEMON_PID=$(cat $MEMCACHED_DAEMON_PID_FILE)
        rm -f ${MEMCACHED_DAEMON_PID_FILE}
        if [ ! -z ${DAEMON_PID} ]; then
            kill -9 ${DAEMON_PID}
        fi
        printf "memcached daemon is stopped\n"
    else
        printf "no memcached daemon running\n"
    fi

    sleep 1

    if [ -f "$MEMCACHED_PID_FILE" ] && [ -s "$MEMCACHED_PID_FILE" ]; then
        PID=$(cat $MEMCACHED_PID_FILE)
        rm -f ${MEMCACHED_PID_FILE}
        if [ ! -z ${PID} ]; then
            kill -9 ${PID}
        fi
        printf "memcached is stopped\n"
    else
        printf "no memcached running\n"
    fi
}

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart)
        stop
        sleep 3
        start
        ;;
    *)
        printf "Usage:$0 {start|stop|restart}\n"
        exit 1
esac
exit 0

3，memcached_daemon.sh 监控memcached 进程，如进程失效则自动启动。
代码：

复制代码代码示例:

	#!/bin/sh  

	#site; www.jbxue.com

	#memcached daemon  

	ROOT=$(cd "$(dirname "$0")"; pwd)  

	. ${ROOT}/memcached_inc.sh  

	while :  

	do  

	    if [ -f "$MEMCACHED_PID_FILE" ] && [ -s "$MEMCACHED_PID_FILE" ]; then  

	        PID=$(cat $MEMCACHED_PID_FILE)  

	    else  

	        PID=""  

	    fi  

	    if [ -z "$PID" ] || [ -z $(ps aux|awk '{print $2}' | grep "^$PID$") ]; then  

	        $MEMCACHED  

	        sleep 1  

	        printf "[$(date +%Y-%m-%d' '%H:%M:%S)] ${SITE} ${HOST} memcached ${PORT} is restarted\n" >> $ERROR_LOG_FILE  

	        echo "Subject: ${SITE} ${HOST} memcached ${PORT} is restarted $(date +%Y-%m-%d' '%H:%M:%S)" | sendmail me@gmail.com  

	    fi  

	    sleep 5  

	done  

	exit 0

调用方法：

复制代码代码示例:

	./gm_memcached.sh start   #启动memcached  

	./gm_memcached.sh stop    #停止memcached  

	./gm_memcached.sh restart #重启memcached

(责任编辑：IT)

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