How to use docker remote connection

Docker is a very popular containerization technology that packages applications and their dependencies in a container. Docker enables packaging and distribution of applications in one go, thereby improving application portability and deployability. When using Docker, many people will encounter the problem of how to use remote connections. In this article, we will explore how to connect remotely using Docker.

1. Use SSH connection

1. Install SSH client: Before connecting to the Docker host, you first need to install the SSH client on your local computer. If you are using Linux or Mac OS, the SSH client is already pre-installed on the system. If you are using Windows, you can use SSH client tools such as PuTTY.
2. Enable SSH server: Docker supports using SSH connections to manage containers. Before enabling, you need to ensure that the SSH server on the host is enabled.
3. Determine the IP address of the Docker host: To connect to the Docker host, you need to know its IP address. You can run the ifconfig command on the host to obtain the IP address.
4. Connect to the Docker host: Run the SSH client and connect to the Docker host. Connect to the host using the IP address and SSH username. By default, the user is root and the password is empty.
5. Enter the container: After connecting to the host using Docker's SSH client tool, you will be able to log into the host and enter a specific container. To enter the container, use the docker exec command, for example: docker exec -it container_name bash.

2. Use SSH Agent

1. Install SSH Agent: SSH Agent is an application that can establish a secure connection between the local computer and the Docker host. There are many SSH proxy tools to choose from, such as autossh, sshuttle, etc.
2. Enable SSH server: Before connecting to the Docker host, you need to enable the SSH server on the host.
3. Enable SSH proxy: Use the proxy tool to connect to the Docker host. To run the agent, use the following command: ssh -ND 1080 user@IP_Address. Among them, 1080 is the proxy port number, user is the SSH username on the host, and IP_Address is the IP address of the Docker host.
4. Configure proxy: Configure the proxy in the browser to connect to the Docker host. Open your browser settings and enter the proxy port number in the proxy options. You can switch back to using a normal local Internet connection at any time.

3. Using Docker API

Docker API is a Restful API that allows users to remotely manage Docker through HTTP. The Docker client uses the API to communicate with the Docker host, and the Docker daemon uses the API to perform the client's requests. Before using the API, you need to ensure that the Docker daemon is enabled on the host machine.

1. Configuring the Docker API: To use the Docker API, you need to enable the Docker daemon's API on the host. Run the following command to enable the API: dockerd --api-cors-header="*" --host tcp://0.0.0.0:2375 --tlsverify --tlscacert=ca.pem --tlscert=server-cert.pem - -tlskey=server-key.pem.
2. Get API Key: In order to use the API, you need to get the API key on the host. Run the following command to obtain the key: openssl s_client -connect IP_Address:2375 -verify 0 /dev/null | openssl x509 -outform PEM > mycertfile.pem.
3. Use API: Use API to establish a connection. You can connect through the following methods: curl --cert mycertfile.pem --key mykeyfile.pem https://IP_Address:2375/containers/json

This article briefly introduces three ways to use Docker Remote connection method. Different methods are suitable for different application scenarios. Choose the method that best suits you to connect to the Docker host.

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