Why have you added the user to the docker user group but still prompt no permission

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In using docker, it is clear that the user has been added to the docker user group, but still prompt no permission, why?

The reason is that although the user has joined the docker user group, he or she has not switched to the docker user group, so he still has no permissions.

If a user belongs to multiple user groups at the same time, the user can switch between user groups to have the permissions of other user groups.

Need to use

Newgrp docker

Try again and there will be no hint of no permission.

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