How to check the public network of docker container

For developers and administrators who use Docker to build and manage containers, it is important to know how to view the public IP address of a Docker container. In this article, we will explore how to view the public IP address of a Docker container and provide some useful tips and tools to help you better manage your containers.

First of all, it should be noted that the Docker container may have multiple IP addresses, including: internal IP address (Private IP Address), management network IP address (Management Network IP Address) and public IP address (Public IP address). IP Address). Among them, the public IP address allows the container to communicate with other computers on the Internet.

There are many ways to check the public IP address of the Docker container. The following are three commonly used methods:

Method 1: Use the docker ps command to check

Use docker The ps command can list information about the currently running Docker container, including container name, container ID, image name used, container status, port mapping, etc. In this list, you can find the public IP address of the Docker container.

The specific steps are as follows:

1. Open a terminal or command line window.
2. Enter the docker ps command and press Enter.
3. Find the name or ID of the Docker container you want to view and record its name or ID.
4. Enter the following command: docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' [container name or ID], and replace it with The name or ID of the Docker container you want to view. Press the Enter key.
5. Wait a few seconds, the system will output the public IP address of the container.

Method 2: Use the docker port command to view

Use the docker port command to view the port mapping information of the container, including the public IP address of the container.

The specific steps are as follows:

1. Open a terminal or command line window.
2. Enter the docker ps command and press Enter.
3. Find the name or ID of the Docker container you want to view and record its name or ID.
4. Enter the following command: docker port [container name or ID] and replace it with the name or ID of the Docker container you want to view. Press the Enter key.
5. Wait a few seconds, the system will output the public IP address and mapped port number of the container.

Method 3: Use the docker inspect command to view

Use the docker inspect command to view the detailed information of the Docker container, including IP address and port information. You can use the grep command to filter unnecessary information to obtain the public IP address of the container.

The specific steps are as follows:

1. Open a terminal or command line window.
2. Enter the docker ps command and press Enter.
3. Find the name or ID of the Docker container you want to view and record its name or ID.
4. Enter the following command: docker inspect [container name or ID] and replace it with the name or ID of the Docker container you want to view. Press the Enter key.
5. The system will output the detailed information of the container. You can use the grep command to find the public IP address of the container.

Summary

This article introduces three different methods to view the public IP address of a Docker container. Through these methods, you can better manage and control the network connections of Docker containers, ensuring that the container can communicate with other computers on the Internet and can access and process data correctly. In addition, you can also use other tools and programming languages ​​to query the public IP address of the Docker container, such as the Docker SDK and Docker API in Python.

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