Does Ansible has limitations on number of hosts that can be executed?
I think there is no hard coded limit. More hosts means more memory consumed by Ansible. Each host has a set of variables and facts for which memory space is allocated. Number of parallel Ansible processes, and thus CPU cores used, can be controlled by -f parameter.
That being said, control node resources are the only limit.
For extra large number of hosts, AWX supports distributed scalable Ansible invocation.
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