Any way to specify SSH key file for EC2 host using EC2 inventory

[Do Hoang Khiem]

I'm using Ansible to manage multiple EC2 instance that could be launched dynamically, keypair is generated for each instance then store in local machine. 

Previously I use default inventory file and in Ansible I can use lineinfile module to add new EC2 host to hosts file with additional vars like ansible_ssh_user, ansible_ssh_private_key_file, that's very convenient as each time I run Ansible playbook I dont have to explicitly specify SSH key. 

But now with change to use EC2 inventory, I can't find a way to add such kind of vars to EC2 host, I know using ssh-agent is a solution, but I would look for a more explicit method that I can manage keys better than just add every generated key to ssh-agent.

Any suggestions? 

[Brian Coca]

create host_vars/<hostname> yaml files with the same info, in a
directory adjacent to the dynamic inventory.

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Brian Coca