Reasons and solutions for docker closing and failing to start

Docker is currently the most popular containerization technology, which allows developers to package an entire application into a container and run it anywhere. But sometimes, you will encounter some problems when closing and starting Docker. The following will introduce some reasons and solutions that may cause Docker to close and fail to start.

1. Docker Daemon is not running

Docker Daemon is the core component of the Docker engine. If it is not running, Docker will not work properly. In Linux systems, you can check the running status of Docker Daemon through the following command:

sudo service docker status

If the output shows that Docker is not running, you can use the following command to start it:

sudo service docker start

If it still cannot be started, Please check the log file.

2. Exceeded Docker Daemon default memory limit

Docker Daemon allocates 2GB of memory by default. If the container you are running requires more memory, it may cause Docker to fail to start. . You can increase the default memory limit of Docker Daemon to 4GB using the following command:

sudo dockerd --default-memory 4G

3. Insufficient hard disk space

Docker requires sufficient hard disk space to store images, containers, and roll. If you don't have enough hard drive space, it may prevent Docker from starting. You can check the hard disk usage with the following command:

sudo df -h

If your hard disk space is insufficient, please free up some space or add more hard disk space.

4. Container is not closed correctly

If the container is not closed correctly, Docker may not start. You can use the following command to view all open containers:

sudo docker ps -a --filter "status=exited"

You can stop and delete these containers using the following command:

sudo docker stop [容器ID]
sudo docker rm [容器ID]

5. Docker configuration file error

If you make changes to Docker's configuration file and a syntax error occurs, Docker may not start. In this case, you can check and test the configuration file using the following command:

sudo docker config --test

If there are errors, check and correct them.

6. Container or image file is damaged

If your container or image file is damaged, Docker may not be able to start. You can use the following command to view all images and containers:

sudo docker images
sudo docker ps -a

You can use the following command to delete unnecessary containers and images:

sudo docker rm [容器ID]
sudo docker rmi [镜像ID]

If the above method still does not solve the problem, it is recommended to reinstall Docker.

In general, these are some possible reasons and solutions that cause Docker to close and fail to start, for reference only. When using Docker, we need to always pay attention to log files and error messages and solve problems in a timely manner.

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