How to solve the problem of Docker on CentOS
Apr 14, 2025 pm 03:00 PMTroubleshooting and Resolving Guide for Docker in CentOS System
This article provides step-by-step guidance to help you diagnose and resolve common Docker problems in CentOS systems.
1. Verify Docker installation and version:
First, make sure Docker has correctly installed and run the compatible version. Check Docker version with the following command:
docker version
If not installed, please use the following command to install:
sudo yum install docker
2. Check Docker service status:
After the installation is complete, check whether the Docker service has started:
systemctl status docker.service
If the service does not start or fails to start, please troubleshoot further based on the error message.
3. Analyze Docker logs:
When the Docker service starts, it is crucial to view the logs:
tail -f /var/log/docker.log
Log information can reveal the root cause of the problem, such as missing dependencies, network connection errors, etc. Repair according to the log prompts.
4. Check Docker configuration file:
An incorrect Docker configuration file may also cause the service to fail to start. In CentOS 7 systems, the configuration file is usually located in /etc/sysconfig/docker
. Edit the configuration file using the following command:
vi /etc/sysconfig/docker
Carefully check the configuration, especially the proxy settings and storage paths, save and restart the Docker service after fixing the error.
5. Clean the Docker cache and restart the service:
If the above method is invalid, try cleaning the Docker cache and restarting the service:
sudo systemctl stop docker.service sudo rm -rf /var/lib/docker/* sudo systemctl start docker.service
This step clears potential cache issues and reinitializes the Docker configuration. The problem still exists, and it is recommended to seek professional technical support.
6. Solve SELinux permissions issues:
If the directory mounted with -v
is not available in the container and a Permission denied
error is prompted, it may be a SELinux rule conflict. Solutions include: add --privileged=true
parameter in docker run
command, disable SELinux, or adjust SELinux rules.
7. Handle firewall issues:
Docker startup exceptions may be related to firewalld. Try temporarily shutting down the firewall:
sudo systemctl stop firewalld sudo systemctl restart docker
If the problem still exists, you need to check the interactive configuration between Docker and firewalld/iptables.
8. Handle kernel errors:
Kernel errors may also cause Docker to fail to start. View the system log for detailed error information and repair or upgrade the kernel based on the error information.
If the problem persists, please refer to the official Docker documentation or seek community help.
The above is the detailed content of How to solve the problem of Docker on CentOS. For more information, please follow other related articles on the PHP Chinese website!

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