Linux system configuration jar package starts automatically at boot

1. Prepare the environment

1. Determine the location where the jar package and script files are stored.
For example, I store the jar package in the /home/project/ directory and the script file in the /home/project/sh/ directory.

2. Determine the location of java

#获取jdk位置（这个需要环境变量配置好才有效）
#第一种方法
echo $JAVA_HOME
# /usr/java/jdk1.8.0_211-amd64

#第二种方法
which java
# /usr/java/jdk1.8.0_211-amd64/bin/java

#第三种方法
whereis java
# java: /usr/bin/java /usr/java/jdk1.8.0_211-amd64/bin/java /usr/share/man/man1/java.1

We only need to make sure that the jdk directory is /usr/java/jdk1.8.0_211-amd64

2. Create new start and stop scripts

Write startup script:

# xxx是你的项目名，用英文或中文拼音都可以
vim /home/project/sh/xxx-service-start.sh

#!/bin/sh
# jdk目录
export JAVA_HOME=/usr/java/jdk1.8.0_211-amd64 
export PATH=$PATH:$JAVA_HOME/bin
# 启动项目（如果不是root用户 需要在前面加sudo，在后面加密码）
nohup java -jar /home/project/xxx-dev1.3.1-8804.jar > /home/project/nohup.out 2>&1 &
# 导出项目启动的pid（用于关闭）
echo $! > /var/run/xxx-dev1.3.1-8804.pid

Write a stop script

vim /home/project/sh/xxx-service-stop.sh

#!/bin/sh
PID=$(cat /var/run/xxx-dev1.3.1-8804.pid)
kill -9 $PID

3. Increase file permissions

cd /home/project/sh
chmod -R 777 xxx-service-stop.sh
chmod -R 777 xxx-service-start.sh

cd /home/project
chmod -R 777 nohup.out
chmod -R 777 xxx-dev1.3.1-8804.jar

4. Configure system files

cd /usr/lib/systemd/system 
touch xxx.service

#固定写法，换一下路径即可
#!/bin/sh
[Unit]
Description=xxx-service
After=syslog.target network.target remote-fs.target nss-lookup.target
[Service]
Type=forking
ExecStart=/home/project/xxx-service-start.sh
ExecStop=/home/project/xxx-service-stop.sh
PrivateTmp=true
[Install]
WantedBy=multi-user.target

5. Execute orders

#将jar添加到开机自启服务中
systemctl enable xxx.service
#系统服务刷新
systemctl daemon-reload

6. Start the service

#启动服务
systemctl start xxx.service

#查看服务状态
systemctl status xxx

#停止服务
systemctl stop xxx

#取消开机自启
systemctl disable xxx