Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon

The error message "Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?" indicates that there is a problem connecting to the Docker daemon. The Docker daemon is responsible for managing Docker containers and must be running for Docker commands to work.

In the provided references, the user encountered this issue after restarting the server, and the Docker containers were not working. They tried various solutions but were unable to resolve the problem until they manually started the Docker daemon.

To fix this issue, you can try the following steps:

1. Check if the Docker daemon is running by using the command: [2]

systemctl status docker

This command will show the status of the Docker service. If it is not running, you will need to start it.

2. Start the Docker daemon by using the command: [2]

dockerd

This command will start the Docker daemon and allow you to connect to it.

3. If the above steps do not resolve the issue, you can try restarting the Docker service: [2]

systemctl restart docker

This command will restart the Docker service and may help in resolving any underlying issues.

Additionally, you can use the following commands for troubleshooting:
- To check the running services, you can use: [3]

systemctl | grep running

This command will show the list of running services, and you can check if the Docker service is listed.

- To view the Docker service startup logs, you can use: [3]

journalctl -u docker

This command will display the logs related to the Docker service startup, which can help in identifying any errors or issues.

Remember to check the system requirements and ensure that Docker is properly installed and configured on your CentOS system.<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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