How to set host_key_checking=false in ansible inventory file?

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Due to the fact that I answered this in 2014, I have updated my answer to account for more recent versions of ansible.

Yes, you can do it at the host/inventory level (Which became possible on newer ansible versions) or global level:

inventory:

Add the following.

ansible_ssh_common_args="-o StrictHostKeyChecking=no"

host:

Add the following.

ansible_ssh_extra_args="-o StrictHostKeyChecking=no"

hosts/inventory options will work with connection type ssh and not paramiko. Some people may strongly argue that inventory and hosts is more secure because the scope is more limited.

global:

Ansible User Guide – Host Key Checking

  • You can do it either in the /etc/ansible/ansible.cfg or ~/.ansible.cfg file:

    [defaults]
host_key_checking = False

  • Or you can setup and env variable (this might not work on newer ansible versions):

    export ANSIBLE_HOST_KEY_CHECKING=False

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