在 Linux 上运行 Java 应用程序即服务 [英] Run a Java Application as a Service on Linux

问题描述

我编写了一个在标准虚拟托管 Linux 解决方案上运行的 Java 服务器应用程序.应用程序一直在运行，侦听套接字连接并为它们创建新的处理程序.它是客户端-服务器应用程序的服务器端实现.

I have written a Java server application that runs on a standard virtual hosted Linux solution. The application runs all the time listening for socket connections and creating new handlers for them. It is a server side implementation to a client-server application.

我启动它的方式是将它包含在服务器的启动 rc.local 脚本中.然而，一旦启动，我不知道如何访问它来停止它，如果我想安装更新，所以我必须重新启动服务器才能重新启动应用程序.

The way I start it is by including it in the start up rc.local script of the server. However once started I do not know how to access it to stop it and if I want to install an update, so I have to restart the server in order to restart the application.

在 Windows PC 上，对于这种类型的应用程序，我可能会创建一个 Windows 服务，然后我可以根据需要停止和启动它.在 Linux 机器上是否有类似的东西，以便如果我启动这个应用程序，我可以停止它并重新启动它，而无需完全重新启动服务器.

On a windows PC, for this type of application I might create a windows service and then I can stop and start it as I want. Is there anything like that on a Linux box so that if I start this application I can stop it and restart it without doing a complete restart of the server.

我的应用程序名为 WebServer.exe.它在服务器启动时通过将其包含在我的 rc.local 中来启动:

My application is called WebServer.exe. It is started on server startup by including it in my rc.local as such:

java -jar /var/www/vhosts/myweb.com/phpserv/WebServer.jar &

我在 Linux 上有点菜鸟，所以任何例子都会被任何帖子所欣赏.但是，我确实有 SSH 和完全 FTP 访问权限来安装任何更新以及访问 Plesk 面板.

I am a bit of a noob at Linux so any example would be appreciated with any posts. However I do have SSH, and full FTP access to the box to install any updates as well as access to a Plesk panel.

推荐答案

我在这里写了另一个简单的包装器:

I wrote another simple wrapper here:

#!/bin/sh
SERVICE_NAME=MyService
PATH_TO_JAR=/usr/local/MyProject/MyJar.jar
PID_PATH_NAME=/tmp/MyService-pid
case $1 in
    start)
        echo "Starting $SERVICE_NAME ..."
        if [ ! -f $PID_PATH_NAME ]; then
            nohup java -jar $PATH_TO_JAR /tmp 2>> /dev/null >> /dev/null &
            echo $! > $PID_PATH_NAME
            echo "$SERVICE_NAME started ..."
        else
            echo "$SERVICE_NAME is already running ..."
        fi
    ;;
    stop)
        if [ -f $PID_PATH_NAME ]; then
            PID=$(cat $PID_PATH_NAME);
            echo "$SERVICE_NAME stoping ..."
            kill $PID;
            echo "$SERVICE_NAME stopped ..."
            rm $PID_PATH_NAME
        else
            echo "$SERVICE_NAME is not running ..."
        fi
    ;;
    restart)
        if [ -f $PID_PATH_NAME ]; then
            PID=$(cat $PID_PATH_NAME);
            echo "$SERVICE_NAME stopping ...";
            kill $PID;
            echo "$SERVICE_NAME stopped ...";
            rm $PID_PATH_NAME
            echo "$SERVICE_NAME starting ..."
            nohup java -jar $PATH_TO_JAR /tmp 2>> /dev/null >> /dev/null &
            echo $! > $PID_PATH_NAME
            echo "$SERVICE_NAME started ..."
        else
            echo "$SERVICE_NAME is not running ..."
        fi
    ;;
esac 

您可以在 此处 了解 init.d 的完整教程和对于 systemd (ubuntu 16+)这里

You can follow a full tutorial for init.d here and for systemd (ubuntu 16+) here

如果需要输出日志替换2

nohup java -jar $PATH_TO_JAR /tmp 2>> /dev/null >> /dev/null &

行

nohup java -jar $PATH_TO_JAR >> myService.out 2>&1&

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