Docker appears cannot connect to the Docker daemon. Is the Docker daemon running in this host error resolution _docker

Docker appears cannot connect to the Docker daemon. Is the Docker daemon running to this host error resolution

Occurrence of the phenomenon:

UBUNTU15, after installing Docker, run Docker images error cannot connect to the Docker daemon. Is the Docker daemon running to this host? The following figure

Figure

Reason Analysis:

At present, I encountered this problem is caused by two reasons, one is the service did not start, the other is the current user does not have permissions.

Solution:

1. Start Services: ServiceDocker start

2. Add sudo before executing the command:sudo docker images

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