linux shell腳本定時3分鐘監控Tomcat，自動重啓

背景：

      公司有個Java項目部署在Tomcat容器中，Tomcat意外宕機後，需要及時重啓。避免在假期時出現問題，現編寫一個自動監控Tomcat狀態的腳本，若Tomcat狀態不正常，則自動重啓Tomcat.

一、Shell腳本如下：

    #!/bin/sh  
    # function:Automatic monitoring tomcat process,down restart operation
    # author:xms
	
    # DEFINE    
    # Get tomcat PID  
    TomcatID=$(ps -ef |grep tomcat |grep -w 'apache-tomcat-7.0.81'|grep -v 'grep'|awk '{print $2}')  
      
    # tomcat startup path 
    StartTomcat=/usr/tomcat/apache-tomcat-7.0.81/bin/startup.sh  
      
    # tomcat cache path
    #Cache=/usr/tomcat/apache-tomcat-7.0.81/work  
      
    # Definition to monitor address of the page
    WebUrl=http://10.200.1.7:8080/barcode/ 
      
    # output logs
	GetPageInfo=/dev/null
	MonitorLog=/usr/tomcat/apache-tomcat-7.0.81/tomcat_restart/TomcatMonitor.log  
      
    Monitor()  
    {  
      echo "[info]Start monitoring tomcat...[$(date +'%F %H:%M:%S')]"  
      if [ $TomcatID ];then  
        echo "[info]tomcat process ID is:$TomcatID."  
        # get the return status code 
        TomcatServiceCode=$(curl -s -o $GetPageInfo -m 10 --connect-timeout 10 $WebUrl -w %{http_code})  
        if [ $TomcatServiceCode -eq 200 ];then  
            echo "[info]The status code is $TomcatServiceCode,tomcat startup success."  
        else  
            echo "[error]Access error,The status code is $TomcatServiceCode,The error Log has output to $GetPageInfo!"  
            echo "[error]Tomcat restart..."  
            kill -9 $TomcatID  # kill the original process of tomcat
            sleep 3  
            #rm -rf $Cache # clean tomcat cache
            $StartTomcat  
        fi  
      else  
        echo "[error]tomcat process does not exist! tomcat restarting...."  
        echo "[info]$StartTomcat,please wait......"  
        #rm -rf $Cache  
        $StartTomcat  
      fi  
      echo "---------------finish in:[$(date +'%F %H:%M:%S')]---------------"  
    }  
    Monitor>>$MonitorLog  

1、通過ps -ef 及 grep 命令定位到對應項目的tomcat，獲取到進程ID。

2、GetPageInfo = /dev/null，無底洞，不輸出。

3、先判斷進程是否存在，不存在則直接重啓。存在則進入狀態判斷，獲取訪問請求頁的 responseCode，不等於200的話也進行重啓。

4、保存shell 名字爲monitor.sh

5、給腳本賦值權限 chmod 777 monitor.sh

二、然後在終端輸入

crontab -e   

三、定位到sh腳本的路徑下，運行腳本（絕對路徑執行會有問題，因爲路徑中含有tomcat，ps -ef|grep過濾出來的PID有誤）

*/3 * * * * cd /usr/tomcat/apache-tomcat-7.0.81/tomcat_restart && ./monitor.sh