How to connect docker ip

With the popularity of Docker containerization technology, more and more developers are beginning to use Docker to build their own applications. However, one thing that is important to keep in mind when using Docker is how to connect to the Docker IP.

Why do you need to connect to Docker’s IP

When using Docker, we usually create multiple containers and connect them through the network. Each container has its own IP address. This IP address is the IP address inside the container, not the IP address of the host. Therefore, if we want to access the container from the host or other containers, we need to know the IP address of the container.

Methods to connect to Docker’s IP

Generally, we can connect to Docker’s IP through the following methods:

1. Use the docker inspect command

Use the docker inspect command to obtain detailed information about the specified container, including the container's IP address. The usage is as follows:

docker inspect --format='{{range.NetworkSettings.Networks}}{{.IPAddress}}{{end}}' <container_name_or_id>

Where, b10b500ee54cee6a0872d0dff4e6e1e7 is the container name or container ID to be queried. This command will return the IP address of the container.

2. Using Docker DNS Service

Docker provides a built-in DNS service for communication between containers. Each container is automatically assigned a name, which can be used to access the container through the DNS service. The name of the container is automatically generated by the Docker engine by default, in the format aac119f8a3a563a827b4e4c50481b4e7_N, where aac119f8a3a563a827b4e4c50481b4e7 is the prefix of the container name or image name, N is an integer. If the container name or image name contains multiple dashes, they will be converted to one underscore. For example, if there is a container named web-server, its default name is web_server_1.

Use the Docker DNS service to easily access the container through the container name. For example, if you want to access another container db_server_1 from container web_server_1, you can use the name of the container as the domain name and ping the domain name in web_server_1. For example:

ping db_server_1

3. Using Docker Network

In Docker, we can create a custom network and connect the container to the network. When containers are connected to the same network, they can use the corresponding container name or service name to connect to each other without using IP addresses.

Create a custom network:

docker network create <network_name>

Connect the container to this network:

docker run --name <container_name> --network <network_name> <image>

Containers in the same network can use the corresponding container name or service name to Connect to each other, for example:

ping <container_name>

Summary

Connecting Docker’s IP is an important operation when using Docker. Use the docker inspect command to obtain the IP address of the container, use the Docker DNS service to access the container through the container name, and use the Docker network to connect the containers to the same network using the corresponding container name or service name to connect to each other. These methods can help us better manage and connect Docker containers, making our work more enjoyable and efficient.

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