How to set host key checking false in ansible inventory file

Question

I would like to use ansible-playbook command instead of  vagrant provision   However setting host key checking false in the hosts file does not seem to work      hosts file vagrant ansible ssh private key file    vagrant d insecure private key  ansible ssh user vagrant ansible ssh port 2222 ansible ssh host 127 0 0 1  host key checking false   Is there a configuration variable outside of Vagrantfile that can override this value

User · Answer

Adding following to ansible config worked while using ansible ad-hoc commands:

[ssh_connection]
# ssh arguments to use
ssh_args = -o StrictHostKeyChecking=no

Ansible Version

ansible 2.1.6.0
config file = /etc/ansible/ansible.cfg

User · Answer

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

User · Answer

In  etc ansible ansible cfg uncomment the line   host key check   False   and in  etc ansible hosts uncomment the line  client ansible ansible ssh host 10 1 1 1 ansible ssh user root ansible ssh pass 12345678   That s all

User · Answer

Yes  you can set this on the inventory host level   With an already accepted answer present  I think this is a better answer to the question on how to handle this on the inventory level  I consider this more secure by isolating this insecure setting to the hosts required for this  e g  test systems  local development machines    What you can do at the inventory level is add  ansible ssh common args  -o StrictHostKeyChecking no    or  ansible ssh extra args  -o StrictHostKeyChecking no    to your host definition  see Ansible Behavioral Inventory Parameters    This will work provided you use the ssh connection type  not paramiko or something else    For example  a Vagrant host definition would look like     vagrant ansible port 2222 ansible host 127 0 0 1 ansible ssh common args  -o StrictHostKeyChecking no    or  vagrant ansible port 2222 ansible host 127 0 0 1 ansible ssh extra args  -o StrictHostKeyChecking no    Running Ansible will then be successful without changing any environment variable     ansible vagrant -i  lt path to hosts file gt  -m ping vagrant   SUCCESS   gt         changed   false        ping    pong      In case you want to do this for a group of hosts  here s a suggestion to make it a supplemental group var for an existing group like this    mytestsystems  test 01 99  example tld   insecuressh children  mytestsystems   insecuressh vars  ansible ssh common args  -o StrictHostKeyChecking no

User · Answer

I could not use    ansible ssh common args  -o StrictHostKeyChecking no    in inventory file  It seems ansible does not consider this option in my case  ansible 2 0 1 0 from pip in ubuntu 14 04   I decided to use   server ansible host 192 168 1 1 ansible ssh common args   -o UserKnownHostsFile  dev null    It helped me   Also you could set this variable in group instead for each host    servers group vars  ansible ssh common args  -o UserKnownHostsFile  dev null

User · Answer

You set these configs either in the  etc ansible ansible cfg or    ansible cfg or ansible cfg in your current directory  file  ssh connection  ssh args   -C -o ControlMaster auto -o ControlPersist 60s -o UserKnownHostsFile  dev null -o StrictHostKeyChecking no  tested with ansible 2 9 6 in ubuntu 20 04

[ansible] How to set host_key_checking=false in ansible inventory file?

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