java 8 启动脚本优化

  1 #!/bin/bash
  2 
  3 JAVA_HOME=/usr/java/default
  4 
  5 #java虚拟机启动参数
  6 JAVA_OPTS="-server -Xms1366m -Xmx2g -Xmn768m -Xss256k -XX:MetaspaceSize=256m -XX:MaxMetaspaceSize=256M -XX:SurvivorRatio=8 -XX:MaxTenuringThreshold=5 -XX:GCTimeRatio=19 -Xnoclassgc -XX:+DisableExplicitGC -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:+UseCMSCompactAtFullCollection -XX:CMSFullGCsBeforeCompaction=0 -XX:-CMSParallelRemarkEnabled -XX:CMSInitiatingOccupancyFraction=70 -XX:SoftRefLRUPolicyMSPerMB=0 -XX:+PrintClassHistogram -XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintHeapAtGC -Xloggc:/data/logs/video-api/gc.log "
  7 
  8 #这里可替换为你自己的执行程序，其他代码无需更改
  9 APP_NAME=video.jar
 10 APP_USER=tomcat
 11 
 12 #SHUTDOWN_WAIT is wait time in seconds for java proccess to stop
 13 SHUTDOWN_WAIT=90
 14 
 15 workdir=$(cd $(dirname $0); pwd)
 16 
 17 #使用说明，用来提示输入参数
 18 usage() {
 19     echo "Usage: sh 执行脚本.sh [start|stop|restart|status]"
 20     exit 1
 21 }
 22 
 23 #检查程序是否在运行
 24 is_exist(){
 25   pid=`ps -ef|grep $APP_NAME|grep -v grep|awk '{print $2}' `
 26   #如果不存在返回1，存在返回0
 27   if [ -z "${pid}" ]; then
 28    return 1
 29   else
 30     return 0
 31   fi
 32 }
 33 
 34 # @args <beg> <end>
 35 # return random integer in [<beg>, <end>)
 36 function random_range() {
 37     local beg=$1
 38     local end=$2
 39     echo $((RANDOM % ($end - $beg) + $beg))
 40 }
 41 
 42 #启动方法
 43 start(){
 44   is_exist
 45   if [ $? -eq "0" ]; then
 46     echo "${APP_NAME} is already running. pid=${pid} ."
 47   else
 48     #port=$(random_range 30000 60000)
 49     port=8004
 50     nohup java $JAVA_OPTS -jar $workdir/$APP_NAME --server.port=$port > /dev/null 2>&1 &
 51     is_exist
 52     if [ $? -eq "0" ]; then
 53        echo "${APP_NAME} started. pid=${pid}, port=$port."
 54     fi
 55   fi
 56 }
 57 
 58 #停止方法
 59 stop(){
 60   is_exist
 61   if [ $? -eq "0" ]; then
 62     kill $pid
 63 
 64 
 65     let kwait=$SHUTDOWN_WAIT
 66     count=0;
 67     until [ `ps -p $pid | grep -c $pid` = '0' ] || [ $count -gt $kwait ]
 68     do
 69       echo -n -e "
e[00;31mwaiting for processes to exite[00m";
 70       sleep 1
 71       let count=$count+1;
 72     done
 73 
 74     if [ $count -gt $kwait ]; then
 75       echo -n -e "
e[00;31mkilling processes didn't stop after $SHUTDOWN_WAIT secondse[00m"
 76       kill -9 $pid
 77     fi
 78 
 79     echo "${APP_NAME} stoped."
 80   else
 81     echo "${APP_NAME} is not running"
 82   fi
 83 }
 84 
 85 #输出运行状态
 86 status(){
 87   is_exist
 88   if [ $? -eq "0" ]; then
 89     echo "${APP_NAME} is running. Pid is ${pid}"
 90   else
 91     echo "${APP_NAME} is NOT running."
 92   fi
 93 }
 94 
 95 #重启
 96 restart(){
 97   stop
 98   start
 99 }
100 
101 #根据输入参数，选择执行对应方法，不输入则执行使用说明
102 case "$1" in
103   "start")
104     start
105     ;;
106   "stop")
107     stop
108     ;;
109   "status")
110     status
111     ;;
112   "restart")
113     restart
114     ;;
115   *)
116     usage
117     ;;
118 esac