Install Docker on Ubuntu bionic according to the digitalocean's instructions and ops.tips.
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Check the file defaults/main.yml for details.
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Including an example of how to use your role (for instance, with variables passed in as parameters) is always nice for users too:
- hosts: servers
roles:
- { role: username.rolename, x: 42 }
MIT
Milad Kawas. @miladkawas