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shell代码（注意，一定要在VIM中编辑，否则执行会有问题）

port=$1if [ ! -n "$port" ];then        echo "please enter the args port!"        exitfiservice_name=$2nc -w2 localhost $portif [ $? != 0 ];then        echo '【'`date +"%Y-%m-%d %H:%M:%S"`'】检测到端口【'${port}'】已经关闭，该服务重新启动'>>/root/monitor_log.log        sh $2	exitfi

执行定时任务 每十秒执行一次

crontab -e* * * * * sleep 10; /root/port_monitor.sh 90  /var/dbstar/program/dmail-tomcat/bin/startup.sh

添加邮件功能

vim /etc/mail.rc

set from=xxx@xxx.com.cn smtp=mail.xxx.com.cnset smtp-auth-user=xxx@xxx.com.cn smtp-auth-password=123456 smtp-auth=login

echo "the port ${port} is down,the server is  restart ${port} port!!"|mail -s "port ${port}/${service_name} is down!" xxx@xxx.com.cn

启动tomcat时乱码解决方案

在catalina.sh中添加如下代码即可

JAVA_OPTS="-Dfile.encoding=utf-8"

最终代码(shell)

port=$1if [ ! -n "$port" ];then        echo "please enter the args port!"        exitfiservice_name=$2nc -w2 localhost $portif [ $? != 0 ];then        echo '【'`date +"%Y-%m-%d %H:%M:%S"`'】检测到端口【'${port}'】已经关闭，该服务重新启动'>>/root/monitor_log.log        if [ -n "$service_name" ];then                sh $2        fi        if [ ! -n "$service_name" ];then                mkdir /tmp/portmonitor/ -p                touch /tmp/portmonitor/${port}.log                flag=$(cat /tmp/portmonitor/${port}.log)                if [ ! -n "$flag" ] || [  "1" != "$flag" ];then                        echo '1'>/tmp/portmonitor/${port}.log                fi        fi        echo "the port ${port} is down,the server is  restart ${port} port!!"|mail -s "port ${port}/${service_name} is down!" xxx@xxx.com.cn        exitfi

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