Docker deployment does not pull the image

Docker is a very popular containerization technology, which can greatly simplify the application development, testing and deployment process. In Docker, image is the core concept, which can be used to describe an application and its running environment. By uploading images to the Docker image repository, applications can be easily deployed in different environments.

However, when using Docker for deployment, sometimes you will encounter the problem of "not pulling the image". This problem generally means that when running a Docker container, if the corresponding image does not exist locally, Docker cannot automatically pull the image from the remote warehouse. At this time, we need to manually download the image and load it locally to run the Docker container normally.

The following introduces some common "mirror not pulling" problems and solutions:

1. Unable to access Docker official image warehouse

Solution: You can pass Modify Docker's configuration file to solve this problem.

In the Ubuntu system, the Docker configuration file is located in /etc/docker/daemon.json. Edit the file and add the following content:

{
    "registry-mirrors": ["https://mirror.example.com"]
}

Among them, https://mirror.example. com is the domestic accelerator address you want to use. Save the file and restart the Docker service to take effect.

2. Docker image warehouse is blocked

Solution: You can use domestic Docker image warehouses, such as Alibaba Cloud, NetEase Cloud, etc.

Taking Alibaba Cloud as an example, you first need to register an Alibaba Cloud account and activate the container image service. Then, execute the following command in Docker:

docker login --username=阿里云账号@域名 registry.cn-hangzhou.aliyuncs.com

Enter your Alibaba Cloud account and password according to the prompts to log in to the image warehouse. Then you can use the image in the Alibaba Cloud image warehouse, for example:

docker pull registry.cn-hangzhou.aliyuncs.com/library/mysql

3. The image name is spelled incorrectly

Solution: Confirm whether the image name is correct. You can avoid typos by searching the image name on the Docker Hub website and copying and pasting it into the terminal command line.

4. The image does not exist

Solution: If the image does not exist, you need to manually download it and load it locally. You can use the docker pull command to download the image, and the docker load command to load it locally, for example:

docker pull nginx:latest
docker save nginx:latest > nginx.tar
scp nginx.tar user@ip:/path/to/nginx.tar

Transfer the downloaded nginx.tar file to the target machine, and use the docker load command to load the image:

docker load < nginx.tar

After the execution is completed, you can start the container through the docker run command.

Summary:

When using Docker for deployment, it is common to encounter the problem of "not pulling the image". To solve this problem, you can modify the Docker configuration file, use the domestic image warehouse, confirm whether the image name is correct, manually download the image and load it locally, etc. I hope that this article can help readers better understand and solve the problem of "not pulling the mirror".

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