创建容器时没有添加参数 --restart=always ，导致的后果是：当 Docker 重启时，容器未能自动启动。

Docker 命令修改

docker container update --restart=always 容器名字

操作实例如下：

[root@localhost mnt]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
46cdfc60b7a6 nginx "nginx -g 'daemon …" About a minute ago Up 42 seconds 80/tcp n3
79d55a734c26 nginx "nginx -g 'daemon …" About a minute ago Up 42 seconds 80/tcp n2
f7b2206c019d nginx "nginx -g 'daemon …" About a minute ago Up 46 seconds 80/tcp n1
[root@localhost mnt]# docker container update --restart=always n1
n1
[root@localhost mnt]# systemctl restart docker
[root@localhost mnt]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
46cdfc60b7a6 nginx "nginx -g 'daemon …" 2 minutes ago Exited (0) 5 seconds ago n3
79d55a734c26 nginx "nginx -g 'daemon …" 2 minutes ago Exited (0) 5 seconds ago n2
f7b2206c019d nginx "nginx -g 'daemon …" 2 minutes ago Up 2 seconds 80/tcp n1