获取后台进程的pid，jar包修改，jar包启动

冷不防 2021-12-18 07:47 657阅读 0赞

场景：后台运行多个springboot或者npm的前端项目， 使用nohup提交后，使用ps -ef |grep spring 产生了多个pid, 不方便管理程序

### 文章目录 ###

*  1, 借鉴kylin后台运行脚本：kylin.sh
 *  2, 获取shell脚本后台运行的pid
 *  3, 后台运行服务
 *   *  a, 后台 --> 调用另一个后台 （自动重启）
     *   *  run.sh (start|stop|status)
     *  b, nohup
 *  4, 生成系统随机数 /dev/urandom
 *  5, jar包修改

# 1, 借鉴kylin后台运行脚本：kylin.sh #

运行kylin.sh start 的时候，实际调用的是如下脚本内容：

if [ "$1" == "start" ]
    then
        ...
        ${start_command} >> ${KYLIN_HOME}/logs/kylin.out 2>&1 & echo $! > ${KYLIN_HOME}/pid &
    
    #换行改写后：
    ${start_command} >> ${KYLIN_HOME}/logs/kylin.out 2>&1 &
    echo $! > ${KYLIN_HOME}/pid #&

# 2, 获取shell脚本后台运行的pid #

[root@lvs-c6 ~]# cat back.sh
    file="https://mirrors.tuna.tsinghua.edu.cn/mysql/downloads/MySQL-8.0/mysql-8.0.21-linux-glibc2.12-x86_64.tar"
    #eval nohup wget $file >/tmp/b.log 2>&1 "&"
    #echo $! > /tmp/back.sh.pid 
    nohup wget  $file >/tmp/b.log 2>&1  & echo $! > /tmp/a.sh.pid &
    
    [root@lvs-c6 aa]# sh -x back.sh
    + file=https://mirrors.tuna.tsinghua.edu.cn/mysql/downloads/MySQL-8.0/mysql-8.0.21-linux-glibc2.12-x86_64.tar
    + eval nohup wget https://mirrors.tuna.tsinghua.edu.cn/mysql/downloads/MySQL-8.0/mysql-8.0.21-linux-glibc2.12-x86_64.tar '&'
    + echo 18011
    18011
    
    [root@lvs-c6 aa]# ls
    back.sh  mysql-8.0.21-linux-glibc2.12-x86_64.tar
    
    [root@lvs-c6 aa]# tailf /tmp/b.log
      7150K .......... .......... .......... .......... ..........  0% 3.28M 45m30s
      ....

# 3, 后台运行服务 #

## a, 后台 --> 调用另一个后台 （自动重启） ##

########### while循环
    [root@localhost ~]$ cat /tmp/1.sh
    cmd(){ 
        date >> /tmp/1.txt 2>&1  &
    }
    run(){ 
       while :
       do
          cmd &
          sleep 1
       done
    }
    run & echo $! > /tmp/1.sh.pid &
    
    ########### java进程
    [root@localhost ~]$ cat /tmp/2.sh
    cmd(){ 
    	#date >> /tmp/1.txt 2>&1 &
    	/opt/soft/apache-tomcat-8.5.65/bin/catalina.sh run >> /tmp/tomcat-test.log 2>&1 
    	
    	if [ $? -eq 0 ]
    	then
    	      echo -n $! >  /tmp/tomcat-test.pid
    	fi
    }
    run(){ 
       while :
       do
           #cmd &
           count=$(ps -ef |grep "/opt/soft/apache-tomcat-8.5.65" |grep -v grep |wc -l)
           [ $count -eq 0 ] && cmd &
           sleep 1
       done
    }
    run & echo $! > /tmp/1.sh.pid &
    
    #停止服务
    [root@localhost ~]$  kill `cat /tmp/1.sh.pid /tmp/tomcat-test.pid `

### run.sh (start|stop|status) ###

[root@sql-node scripts]# cat run.sh
    #!/bin/bash
    #description: start service (zookeeper)
    #chkconfig: 235 90 90
    start(){ 
        cmd="$1"
        log="$2"
        pidfile="$3"
        #mkdir for log and pid
        [ -d ${log%/*} ]  || mkdir -p ${log%/*}
        [ -d ${pidfile%/*} ]  || mkdir -p ${pidfile%/*}
        $cmd 2>&1 > $log  & echo $! > $pidfile &
    }
    stop(){ 
        pidfile=$1
        if kill `cat $pidfile` > /dev/null 2>&1 ;then
           sleep 2
        fi
        #check if stopped
        status $pidfile
    }
    status(){ 
        pidfile=$1
        if ! ps  `cat $pidfile`  > /dev/null 2>&1 ; then
            echo " stopped"
        else
            echo " running (pid=`cat $pidfile`)... "
        fi
    }
    
    source /etc/profile >/dev/null 2>&1
    #1,zk
    cmd="zookeeper-server-start $CONFLUENT_HOME/etc/kafka/zookeeper.properties"
    log=/var/log/zk.log
    pid=/var/run/zk.pid
    
    case $1 in
      start) start "$cmd" $log $pid &  ;;
      stop)  stop $pid ;;
      *)     status $pid ;;
    esac

## b, nohup ##

[test@localhost ~]$ cat a.sh
    nohup java -Dserver.port=8800 -jar demo3-0.0.1-SNAPSHOT.jar > a.log 2>&1 </dev/null & echo $! > a.sh.pid &
    
    [test@localhost ~]$ sh a.sh
    [test@localhost ~]$ ps -ef |grep demo
    yskj      31130      1 99 09:38 pts/0    00:00:11 java -Dserver.port=8800 -jar demo3-0.0.1-SNAPSHOT.jar
    yskj      31271  24788  0 09:38 pts/0    00:00:00 grep --color demo
    
    [test@localhost ~]$ cat a.sh.pid
    31130
    [test@localhost ~]$ kill `cat a.sh.pid `
    [test@localhost ~]$ ps -ef |grep demo
    yskj      31637  24788  0 09:39 pts/0    00:00:00 grep --color demo

[root@c7-docker test1]# cat cmd.sh
    case $1 in
     start)
        nohup java -Dserver.port=8800 -jar demo3-0.0.1-SNAPSHOT.jar > log.txt 2>&1 </dev/null & echo $! > pid &
        tailf log.txt
      ;;
    
     stop)
        [ -f pid ] && kill -9 $(cat pid) &&  rm -f pid
     ;;
    
     *)
       echo "Usege: $0 start|stop"
    esac
    
    
    [root@c7-docker test1]# ./cmd.sh start
    SLF4J: Class path contains multiple SLF4J bindings.
    SLF4J: Found binding in [jar:file:/root/test1/demo-0.0.1-SNAPSHOT.jar!/BOOT-INF/lib/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
    SLF4J: Found binding in [jar:file:/root/test1/demo-0.0.1-SNAPSHOT.jar!/BOOT-INF/lib/slf4j-log4j12-1.7.30.jar!/org/slf4j/impl/StaticLoggerBinder.class]
    SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
    SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
    
      .   ____          _            __ _ _
     /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
     \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
      '  |____| .__|_| |_|_| |_\__, | / / / /
     =========|_|==============|___/=/_/_/_/
     :: Spring Boot ::                (v2.4.2)
    
    2021-02-25 10:55:39.186  INFO 27390 --- [           main] com.example.demo.DemoApplication         : Starting DemoApplication v0.0.1-SNAPSHOT using Java 1.8.0_211 on c7-docker with PID 27390 (/root/test1/demo-0.0.1-SNAPSHOT.jar started by root in /root/test1)
    2021-02-25 10:55:39.195  INFO 27390 --- [           main] com.example.demo.DemoApplication         : No active profile set, falling back to default profiles: default
    ...

# 4, 生成系统随机数 /dev/urandom #

[root@c7 ~]# yum -y install rng-tools
    Loaded plugins: fastestmirror
    Loading mirror speeds from cached hostfile
     * base: mirrors.ustc.edu.cn
     * extras: mirrors.163.com
     * updates: mirrors.ustc.edu.cn
    Package rng-tools-6.3.1-5.el7.x86_64 already installed and latest version
    Nothing to do
    
    [root@c7 ~]# cat /etc/sysconfig/rngd
    EXTRAOPTIONS="-r /dev/urandom -o /dev/random"
    
    [root@c7 ~]# cat /usr/lib/systemd/system/rngd.service
    [Unit]
    Description=Hardware RNG Entropy Gatherer Daemon
    [Service]
    ExecStart=/sbin/rngd -f -r /dev/urandom -o /dev/random
    [Install]
    WantedBy=multi-user.target
    
    [root@c7 ~]# systemctl start rngd
    [root@c7 ~]# systemctl enable rngd

# 5, jar包修改 #

#获取文件路径
    [root@c7 ~]# jar -tf /tmp/test.jar |grep application
    BOOT-INF/classes/application.yml
    #取出文件
    [root@c7 ~]# jar -xf /tmp/test.jar BOOT-INF/classes/application.yml
    [root@c7 ~]# ls BOOT-INF/classes/
    application.yml
    #修改文件后，更新到jar包
    [root@c7 ~]# jar -uvf /tmp/test.jar BOOT-INF/classes/application.yml
    adding: BOOT-INF/classes/application.yml(in = 1525) (out= 834)(deflated 45%)