java 8 启动脚本优化-白红宇

java 8 启动脚本优化

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发布时间：2019-06-14

本文共 2959 字，大约阅读时间需要 9 分钟。

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 
      
      
        35 # return random integer in [
       
        , 
        
         ) 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 $kwait ] 68     do 69       echo -n -e "\n\e[00;31mwaiting for processes to exit\e[00m"; 70       sleep 1 71       let count=$count+1; 72     done 73  74     if [ $count -gt $kwait ]; then 75       echo -n -e "\n\e[00;31mkilling processes didn't stop after $SHUTDOWN_WAIT seconds\e[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" in103   "start")104     start105     ;;106   "stop")107     stop108     ;;109   "status")110     status111     ;;112   "restart")113     restart114     ;;115   *)116     usage117     ;;118 esac