How to solve docker ce startup failure

Docker CE is one of the most widely used containerization technologies. It provides us with a fast, safe and efficient deployment environment. However, when you use Docker CE, you may encounter some startup failure problems. Here are some possible reasons and solutions.

First of all, if you encounter problems when Docker CE starts, you can view the container running log and the status of the container by executing the following command:

systemctl status docker.service

This will display the status of Docker and the latest log. If it shows not running, you can start Docker with the following command:

systemctl start docker.service

Here are some possible reasons and solutions for Docker CE startup failure:

1. Hardware virtualization is not enabled

If your CPU supports virtualization technology but does not enable it, the Docker CE container will not start. You can enable hardware virtualization technology by accessing BIOS/UEFI settings.

2. Docker service does not start

Docker CE service does not start is another common reason for Docker startup failure. This may be caused by system configuration files being changed or the Docker CE service being uninstalled. You can check whether Docker is started by using the following command:

sudo systemctl status docker

If it is not turned on, you can use the following command to start Docker:

sudo systemctl start docker

3. Container port is occupied

Another common problem is encountering a port already occupied error when starting a container. You can use the following command to check whether the port is already occupied:

sudo netstat -plnt

This command will display all listening ports. If you encounter a problem with port occupancy, you can use the following command to kill the process that occupies the port:

sudo kill <pid></pid>

PID is the process ID, what to use depends on your system and process type.

4. Configuration file errors

Docker CE uses configuration files to manage the behavior of containers. Docker CE will fail to start if you set the wrong parameters or format in the configuration file. You can use the following command to check the configuration file:

sudo nano /etc/docker/daemon.json

The more popular misconfigurations are daemon.json file with illegal JSON format, invalid configuration involving remote access, etc. Please make sure your configuration file is valid.

5. Insufficient disk space

Docker CE requires sufficient disk space to store images and containers. Docker CE will not start when you run out of disk space. You can check disk usage with the following command:

sudo df -h

If you are running out of disk space, consider deleting useless files or increasing disk capacity.

Summary: The above are some common reasons for docker ce startup failure. Of course, there may be other problems that are difficult to solve and vary from person to person. After fixing most startup errors, Docker CE should run normally. At the same time, you can also help solve startup errors through the Docker CE error log and query the Docker CE forum and documentation.

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