Reasons and solutions why docker cannot set up to start automatically at boot

Docker is a popular containerization platform that allows users to create, package and deploy applications. Docker's flexibility and portability make it very popular during development and deployment. However, sometimes you encounter the problem that Docker cannot be set to start automatically at boot. In this article, we'll cover some common causes and solutions to help you resolve this issue.

1. Check whether the Docker service has been installed and started

First, you need to make sure that the Docker service has been installed and started. In Linux systems, you can use the following command to check the status of the Docker service:

systemctl status docker.service

If the Docker service is not started, you can use the following command to start it:

systemctl start docker.service

If you want the Docker service to be It starts automatically at boot. You can use the following command to set it to start automatically at boot:

systemctl enable docker.service

2. Check whether the Docker user group is configured correctly

In Linux systems, in order To enable ordinary users to access the Docker service, you need to add the user to the Docker user group. If you do not add the user to the Docker user group, you may have permission issues when starting Docker.

You can use the following command to add a user to the Docker user group:

sudo usermod -aG docker your_username

where your_username is the username you want to add to the Docker user group.

3. Check whether the Docker configuration file is correct

In a Linux system, the Docker service uses a configuration file to determine how to start and run the container. If the configuration file is incorrect, the Docker service may not start.

You can check the location of the Docker configuration file using the following command:

docker info | grep -i config

Normally, the Docker configuration file is located in the /etc/docker/ directory. You can edit the Docker configuration file using the following command:

sudo nano /etc/docker/daemon.json

Then, you can add the following content to the configuration file:

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

where your_Docker_mirror_url is the Docker mirror warehouse address you want to use.

4. Check the Docker log

If you still cannot start the Docker service, you can check the Docker log for more information. You can use the following command to view the Docker log:

sudo journalctl -u docker.service

In the log, you can view the error message when the Docker service is started to determine the cause of the problem.

Summary

Docker is a popular containerization platform, but sometimes you encounter the problem that Docker cannot be set to start automatically at boot. When troubleshooting this issue, you can check whether the Docker service has been installed and started, whether the Docker user group is configured correctly, whether the Docker configuration file is correct, and view the Docker logs for more information. Through these methods, you can quickly locate and solve the problem that Docker cannot be set to start automatically at startup.

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