Where can I get a list of Ansible pre-defined variables?

Question

I see that Ansible provide some pre-defined variables that we can use in playbooks and template files. For example, the host ip address is ansible_eth0.ipv4.address. Googlei

Answer 1

Some variables are not available on every host, e.g. ansible_domain and domain. If the situation needs to be debugged, I login to the server and issue:

user@server:~$ ansible -m setup localhost | grep domain
 [WARNING]: provided hosts list is empty, only localhost is available
    "ansible_domain": "prd.example.com",