docker adds port mapping to started container

Docker has running container to add port mapping

Add port mapping for running containers

1. Check whether the container maps the port

docker port [容器id 或 容器名]

There is port mapping:

No port mapping:

2. View the complete ID of the container

docker inspect [容器id] | grep Id
// 得到以下结果
//    "Id": "fcae55f5180a79487662de426863565c7df05ed9b87854093b62776734928d25",

3. Enter the docker container directory to view

cd  /var/lib/docker/containers/var/lib/docker/containers

4. Enter the directory based on the complete container ID obtained.

cd fcae55f5180a79487662de426863565c7df05ed9b87854093b62776734928d25

There are two files in the directory: hostconfig.jsonand config.v2.json. Viewing the file content directly is confusing. You can download it to your local machine and use the json tool to view it.

5. Modify configuration file

hostconfig.json

// 当前容器 3306 端口绑定到本机 3306 端口
"PortBindings": {
    
    
    "3306/tcp": [
        {
    
    
            "HostIp": "",
            "HostPort": "3306"
        }
    ]
},

config.v2.json

// 这个文件需要查看两个位置
	// 暴露 3306、33060 端口
"ExposedPorts": {
    
    
    "3306/tcp": {
    
    
    },
    "33060/tcp": {
    
    
    }
},

// 和 
	// 这一段应该是表示哪些ip可以访问之类的
	// 如下也是我从一个 docker run -d -p80:80 ... 带有端口映射的容器的 config.v2.json 文件中复制出来修改后的
"Ports": {
    
    
    "3306/tcp": [
        {
    
    
            "HostIp": "0.0.0.0",
            "HostPort": "3306"
        },
        {
    
    
            "HostIp": "::",
            "HostPort": "3306"
        }
    ],
    "33060/tcp": null
},

6. Replace configuration file

1. Stop container

   docker stop [容器Id 或 容器名]
   

2. Copy the modified configuration file to the specified directory /var/lib/docker/containers/完整容器Id(you can back up the original file first if you are afraid of making mistakes)

3. Restart docker

   systemctl restart docker
   

4. After restarting, you can first check whether the hostconfig.jsonand config.v2.jsonconfiguration files have been modified. If not, you can try uploading them a few more times (this is what happened to me).

5. Finally, check whether the port number is mapped

   docker port [容器id 或 容器名称]