Ansible: [WARNING]: Found both group and host with same name

Question

Using the ec2.py inventory script to query against my EC2 instances. I keep getting the following warning signs. How can i suppress them by fixing what's causing the issue?

[WARNING]: Found both group and host with same name: nex-1.XYZ.net
[WARNING]: Found both group and host with same name: admin-1.XYZ.net
[WARNING]: Found both group and host with same name: jenkinsmaster-1.XYZ.net

Answer 1

Spotting the reuse of the same name as host and group is easy :

[webserver]
webserver

But it might be trickier because sometimes it's just you have forgotten to add the :children in your group definition

This definition will rise a Warning :

[webservers]               # <-- 'webservers' is a group
web1
web2

[agent_x]
webservers                 # <-- 'webservers' is a host 

While this one won't :

[webservers]               # <-- 'webservers' is a group
web1
web2

[agent_x:children]
webservers                 # <-- 'webservers' is a group

Quote from ansible 2.4 documentation https://github.com/ansible/ansible/blob/stable-2.4/docs/docsite/rst/intro_inventory.rst#groups-of-groups-and-group-variables

It is also possible to make groups of groups using the :children suffix in INI or the children: entry in YAML

Meaning you have to be explicit whether the group will list hosts or groups.