e.g https://ranchermanager.docs.rancher.com/how-to-guides/new-user-guides/infrastructure-setup/nodes-in-amazon-ec2 it refers to this install script:

curl <https://releases.rancher.com/install-docker/18.09.sh> | sh

Which seems outdated:

Package docker-ce is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  docker-ce-cli

E: Version '' for 'docker-ce' was not found
E: Version '' for 'docker-ce-cli' was not found