What to do if centos7 fails to start docker

When using Docker on the CentOS 7 operating system, Docker startup failure often occurs. This condition can occur for a number of reasons. This article will introduce some common causes and solutions to help you diagnose and solve the problem of Docker startup failure.

1. Confirm whether Docker is installed

Before starting Docker, you need to install Docker first. On CentOS 7, you can use the following command to install Docker:

sudo yum install docker

After the installation is complete, you can use the following command to check whether Docker has been installed:

docker version

If the Docker version information is output, it means that Docker has been installed. Successful installation.

2. Check whether the Docker service has been started

If you have installed Docker, but Docker fails to start, it may be because the Docker service has not started. Use the following command to check whether the Docker service is running:

systemctl status docker.service

If the Docker service does not start, use the following command to start the Docker service:

systemctl start docker.service

If starting the Docker service fails, it may be due to other reasons Caused by the reason, you need to troubleshoot based on the error message.

3. Check the Docker log

When Docker fails to start, you can find the root cause of the problem by checking the Docker log. Docker logs are usually stored in the /var/log/docker.log file. You can use the following command to view the Docker log:

tail -f /var/log/docker.log

By viewing the Docker log, you can usually find the specific cause of the Docker startup failure, such as missing Certain dependencies, network connection errors, etc.

4. Check the Docker configuration file

Docker startup failure may also be caused by a configuration file error. On CentOS 7, Docker's configuration files are usually located in the /etc/sysconfig/docker file. You can edit the Docker configuration file using the following command:

vi /etc/sysconfig/docker

Check the configuration file for errors or incorrect settings and make changes accordingly.

5. Clear the Docker cache and restart Docker

If you have tried the above methods but still cannot start Docker, you can clear the Docker cache and restart Docker. You can clear the Docker cache using the following command:

systemctl stop docker.service
rm -rf /var/lib/docker/*
systemctl start docker.service

By clearing the Docker cache, the problem of Docker startup failure is sometimes solved.

Summary

The above are some common reasons and solutions for Docker startup failure. If you encounter the problem of Docker startup failure, you can diagnose and solve it according to the above methods. At the same time, in order to avoid Docker startup failure, it is recommended that you regularly upgrade Docker and ensure that all necessary dependencies are installed on your system.

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