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+SETUP
+=========
+
+1. Copy `group_vars/all.yaml.example` to `group_vars/all.yaml`
+2. Fill `all.yaml` with the gateway hostname and the content of the `user_ca_key`
+3. Add the gateway hostname to `inventory`, set `ansible_host` and `ansible_user`
+4. Add the ca hostname to `inventory`, set `ansible_host` and `ansible_user`
+