What is docker load? Why is there no more?

Docker is currently the most popular containerization platform, providing a convenient and highly portable solution for application deployment and management. Docker uses containerization technology to package an application and all its dependencies together and run it in any environment. It provides a fast, reliable and efficient way to deliver applications for organizations of all industries and sizes.

When using Docker, an important operation is to load the Docker image onto the host so that the container can be run on it. During this process, sometimes we encounter a situation: Why is there no docker load? This problem bothers many people, and this article will introduce this problem and its solution.

1. What is docker load?

Before solving the problem of why there is no docker load, let’s first understand what docker load is. docker load is the part of the docker command used to load a Docker image on the local file system into the Docker daemon. Specifically, it decompresses and extracts the image layers from a tar-formatted image file (e.g., a file exported via the docker save command), then packages them into a new Docker image and adds it to the Docker daemon's local in the mirror repository.

2. Why is there no docker load?

Now the question comes, why is there no docker load? Usually, this situation occurs when using the Docker for Mac or Docker for Windows tools officially provided by Docker. This is because these tools already start the Docker daemon at startup and run it in the virtual machine. Although the virtual machine automatically mounts directories on the host when it starts, these directories can only be accessed from the virtual machine and cannot be directly accessed from the terminal or command line on the host.

Therefore, if you try to use the docker load command to load an image directly from the terminal or command line on the host, you may see an error message similar to "no such file or directory" prompting you The file to load cannot be found.

3. Solution:

Although the image cannot be loaded directly from the terminal or command line on the host, you can use the command line tool that comes with Docker for Mac or Docker for Windows. Complete this operation. Specifically, you need to use the following command:

1. For Docker for Mac:

Open the Docker CLI terminal with the following command:

$ screen ~ /Library/Containers/com.docker.docker/Data/vms/0/tty

Enter your username and password and press Enter:

login as: root
password : docker

Use the following command to import the Docker image:

docker load < your-image.tar

2. For Docker for Windows:

Search and open the "Docker Desktop" application in the Start menu.

In Docker Desktop, select "Settings" -> "Resources" -> "File Sharing".

Add the Docker image folder to be imported to the shared list and confirm the changes.

Open the "Windows PowerShell" or "Command Prompt" terminal and use the following command to import the Docker image:

docker load < your-image.tar

Note, use When operating the above command, you need to replace "your-image.tar" with the name of the specific file you want to import.

4. Summary:

When using Docker, the import and export of images are very common operations. However, in certain cases, such as when using the Docker for Mac or Docker for Windows tools, loading the image directly from the terminal or command line on the host may cause problems with docker load. However, you can do this easily with the appropriate command line tools.

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