Background configuration for Spring Boot applications

Soy sauce article, organize some configuration methods about Spring Boot background operation. Before introducing the background running configuration, let's review several ways of running Spring Boot applications:

The main class of the application that runs Spring Boot
Use Maven's Spring Boot plugin mvn spring-boot:runto run
After typing into a jar package, use the java -jarrun

When we are developing, we usually use the first two, and we often use the third when deploying. However, when we use java -jarto run, it is not running in the background. Let's sort out how to configure the background operation for Windows and Linux/Unix environments.

Windows

It is relatively simple under Windows, we can use this software directly: AlwaysUp. As shown in the figure below, it is simple, violent, and easy to use.

The configuration method is very simple, we only need to pass the Spring Boot application mvn installinto a jar package, and then write a java -jar yourapp.jarbat file. Open it again AlwaysUp, click the first button on the toolbar, as shown in the figure below, select the bat file written above, and fill in the service name.

After the creation is completed, you can see the service we configured in the list, and right-click to select Start xxxthe application to start the application in the background.

Linux/Unix

Let's talk about how to configure it on the server. In fact, there are many ways to achieve it, here are two more useful ways:

nohup和Shell

This method is mainly implemented by using nohupcommands, the details of which are as follows:

nohup command

Purpose: Run a command without hanging up.

Syntax: nohup Command [ Arg … ][ & ]

描述：nohup 命令运行由 Command 参数和任何相关的 Arg 参数指定的命令，忽略所有挂断（SIGHUP）信号。在注销后使用 nohup 命令运行后台中的程序。要运行后台中的 nohup 命令，添加 &到命令的尾部。

所以，我们只需要使用nohup java -jar yourapp.jar &命令，就能让yourapp.jar在后台运行了。但是，为了方便管理，我们还可以通过Shell来编写一些用于启动应用的脚本，比如下面几个：

关闭应用的脚本：stop.sh

 
      #!/bin/bash 
     
       PID=$(ps -ef | grep yourapp.jar | grep -v grep | awk 
      '{ print $2 }') 
     
      if [ -z 
      "$PID" ] 
     
      then 
     
      echo Application is already stopped 
     
      else 
     
      echo 
      kill 
      $PID 
     
      kill 
      $PID 
     
      fi

启动应用的脚本：start.sh

#!/bin/bash

nohup java -jar yourapp.jar --server.port=8888 &

整合了关闭和启动的脚本：run.sh，由于会先执行关闭应用，然后再启动应用，这样不会引起端口冲突等问题，适合在持续集成系统中进行反复调用。

 
      #!/bin/bash 
     
      echo stop application 
     
      source stop.sh 
     
      echo start application 
     
      source start.sh

系统服务

在Spring Boot的Maven插件中，还提供了构建完整可执行程序的功能，什么意思呢？就是说，我们可以不用java -jar，而是直接运行jar来执行程序。这样我们就可以方便的将其创建成系统服务在后台运行了。主要步骤如下：

在pom.xml中添加Spring Boot的插件，并注意设置executable配置

 
      <build> 
     
      <plugins> 
     
      <plugin> 
     
      <groupId>org.springframework.boot 
      </groupId> 
     
      <artifactId>spring-boot-maven-plugin 
      </artifactId> 
     
      <configuration> 
     
      <executable>true 
      </executable> 
     
      </configuration> 
     
      </plugin> 
     
      </plugins> 
     
      </build>

在完成上述配置后，使用mvn install进行打包，构建一个可执行的jar包
创建软连接到/etc/init.d/目录下

sudo ln -s /var/yourapp/yourapp.jar /etc/init.d/yourapp

在完成软连接创建之后，我们就可以通过如下命令对yourapp.jar应用来控制启动、停止、重启操作了

/etc/init.d/yourapp start|stop|restart