编写/etc/systemd/system/myapp.service内容如下

[Unit]
Description=MyApp
After=docker.service
Requires=docker.service

[Service]
TimeoutStartSec=0
ExecStartPre=-/usr/bin/docker kill busybox1
ExecStartPre=-/usr/bin/docker rm busybox1
ExecStartPre=/usr/bin/docker pull busybox
ExecStart=/usr/bin/docker run --name busybox1 busybox /bin/sh -c "trap 'exit 0' INT TERM; while true; do echo Hello World; sleep 1; done"

[Install]
WantedBy=multi-user.target

配置作为服务自动启动
sudo systemctl enable myapp.service
sudo systemctl start myapp.service
检查服务运行状态
journalctl -f -u hello.service