Ansible remote_user vs ansible_user

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They both seem to be the same. Take a look here:

https://github.com/ansible/ansible/blob/c600ab81ee/lib/ansible/playbook/play_context.py#L46-L55

# the magic variable mapping dictionary below is used to translate
# host/inventory variables to fields in the PlayContext
# object. The dictionary values are tuples, to account for aliases
# in variable names.

MAGIC_VARIABLE_MAPPING = dict(
   connection       = ('ansible_connection',),
   remote_addr      = ('ansible_ssh_host', 'ansible_host'),
   remote_user      = ('ansible_ssh_user', 'ansible_user'),
   port             = ('ansible_ssh_port', 'ansible_port'),

Besides, ansible_user is used when we want to specifiy default SSH user in ansible hosts file where as remote_user is used in playbook context.

From https://github.com/ansible/ansible/blob/c600ab81ee/docsite/rst/intro_inventory.rst

ansible_user
The default ssh user name to use.

and here is an example of using ansible_user in ansible hosts file:

[targets]

localhost              ansible_connection=local
other1.example.com     ansible_connection=ssh        ansible_user=mpdehaan
other2.example.com     ansible_connection=ssh        ansible_user=mdehaan

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