To install, go to https://docs.docker.com/install/linux/docker-ee/centos/
Notes:
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The trial will get from https://storebits.docker.com/ee/trial/sub-bfc3849b-511c-4764-af8f-8435972037c3. You can get this link after success logging the docker page.
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When setting up the repository,
$ export DOCKERURL="<DOCKER-EE-URL>"
The variable DOCKERURL should be https://storebits.docker.com/ee/trial/sub-bfc3849b-511c-4764-af8f-8435972037c3 where the link you get at 1