How to get the IP address of a Docker container

Docker is a popular containerization technology that makes it easy to build, deploy and manage applications. When using Docker, obtaining the IP address of the container is an extremely important operation. This article will introduce how to obtain the IP address of a Docker container.

1. Obtain through the docker inspect command

First we can use the docker inspect command to obtain the IP address of the Docker container. This command displays detailed information about the Docker container, including IP address. You can obtain the detailed information of the container through the following command:

docker inspect [container_id]

where [container_id] is the ID number of the Docker container. This command will output data in JSON format, which contains detailed information about the container, including network information. You can obtain the IP address of the container by looking for IPAddress.

2. Obtain the IP address of the Docker container through the docker ps command

Another method is to use the docker ps command to obtain the IP address of the Docker container. This command can display the basic information of the Docker container, including the name, ID, status, image used, port mapping, etc. of the container. You can obtain detailed information about the container through the following command:

docker ps

This command will output a list of basic information about the container. We can find the row where the container that needs to obtain the IP address is located, and find its corresponding port mapping information. Generally speaking, if a container is running on the default Bridge network, its IP address can be resolved by its container name or ID as a DNS name. For example, if the name of the container is webapp, you can use the following command to obtain the IP address of the container:

docker inspect -f '{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' webapp

3. Obtain it through the docker network inspect command

Finally, we can also obtain it through the docker network inspect command command to get the IP address of the container. If the container is connected to multiple networks, we need to specify the required network. You can use the following command to obtain the IP address of the container:

docker network inspect [network_name]

where [network_name] is the name of the Docker network. This command will output data in JSON format, which contains information about all containers on the network, including their IP addresses.

Summary:

Obtaining the IP address of the Docker container is a very important operation. We can use the docker inspect command, docker ps command or docker network inspect command to obtain the IP address. In actual applications, we need to choose the most appropriate method to obtain the IP address according to the actual situation in order to better manage Docker containers.

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