shell实战之tomcat看门狗

  1 #!/bin/bash
  2 #以下为多行注释
  3 : << !
  4 作用：tomcat watch dog，用于在tomcat进程退出后，自动拉起tomcat
  5 函数说明：
  6         log_info：打印日志的函数，入参为需要在日志中打印的msg
  7         start_tom：启动tomcat的函数
  8         check_tom_run:每隔10s检测tomcat进程是否存在
  9         log_backup:备份tomcat监控日志
 10 !
 11 
 12 curr_path=`pwd`
 13 #tomcat的安装路径
 14 tom_path=/home/stephen/InstallPath/apache-tomcat-8.5.39
 15 
 16 
 17 #定义打印日志的函数
 18 function log_info(){
 19 local curr_time=`date "+%Y-%m-%d %H:%M:%S"`
 20 log_file=${curr_path}/tom_running.log
 21 #判断日志文件是否存在
 22 if [ -e ${log_file} ]
 23    then
 24    #检测文件是否可写
 25    if [ -w ${log_file} ]
 26    then
 27        #若文件无写权限则使用chmod命令赋予权限
 28        chmod 770 ${log_file}
 29    fi
 30 else
 31    #若日志文件不存在则创建
 32    touch ${log_file}
 33 fi
 34 #写日志
 35 local info=$1
 36 echo "${curr_time}  `whoami` [Info] ${info}">>${log_file}
 37 }
 38 
 39 function start_tom(){
 40         log_info "Begin to start tomcat."
 41         cd ${tom_path}/bin
 42         log_info "cd ${tom_path}/bin"
 43         sh  startup.sh
 44         log_info "sh  startup.sh"
 45         #使用ps命令+awk获取tomcat的PID
 46         tom_pid=`ps -aux|grep apache-tomcat|grep -v grep|awk ‘{print $2}‘`
 47         if  [ -z ${tom_pid} ]
 48             then
 49             sh startup.sh
 50         fi
 51         log_info "End to start tomcat."
 52 }
 53 
 54 #如果tomcat_pid为零，则说明tomcat进程不存在，需要去重启
 55 function check_tom_run()
 56 {
 57 tom_pid=`ps -aux|grep apache-tomcat|grep -v grep|awk ‘{print $2}‘`
 58 echo ${tom_pid}
 59 if [ -z ${tom_pid} ]
 60 then
 61    echo "tomcat process is not running."
 62    #调用函数start_tom
 63    start_tom
 64    log_info "tomcat process is not running."
 65    #打印日志
 66 else
 67    echo "tomcat process is running"
 68    #打印日志
 69    log_info  "tomcat process is running"
 70 fi
 71 }
 72 #备份日志
 73 function log_backup(){
 74 cd ${curr_path}
 75 log_name=tom_running.log
 76 #获取当前日志的大小
 77 log_size=`ls -all|grep -v ${log_name}.|grep  ${log_name}|awk ‘{print $5}‘`
 78 echo ${log_size}
 79 #当日志大于150MB时进行备份并清空旧的日志
 80 expect_size=`expr 150 \* 1024 \* 1024`
 81 echo ${expect_size}
 82 if [ ${log_size} -gt ${expect_size} ]
 83    then
 84    log_info "Begin to backup log."
 85    local ct=`date "+%Y-%m-%d-%H-%M-%S"`
 86    cp ${log_name} ${log_name}.${ct}
 87    log_info "cp ${log_name} ${log_name}.${ct}"
 88    #使用gzip命令压缩日志
 89    gzip -q  ${log_name}.${ct}  ${log_name}.${ct}.gz
 90    #清空旧日志
 91    cat  /dev/null > ${log_name}
 92    log_info "cat  /dev/null > ${log_name}"
 93 fi
 94 }
 95 
 96 #隔30s循环执行check_tom_1run
 97 while [ 1 ]
 98 do
 99   check_tom_run
100   log_backup
101   #休眠30s
102   sleep 30
103 done