Ansible provisioning ERROR! Using a SSH password instead of a key is not possible

Question

I would like to provision with my three nodes from the last one by using Ansible.

My host machine is Windows 10.

My Vagrantfile looks like:

Answer 1

This SO post gave the answer.

I just extended the known_hosts file on the machine that is responsible for the provisioning like this:

Snippet from my modified Vagrantfile:

...
if index == 3
    node.vm.provision :pre, type: :shell, path: "install.sh"

    node.vm.provision :setup, type: :ansible_local do |ansible|
...

My install.sh looks like:

# add web/database hosts to known_hosts (IP is defined in Vagrantfile)
ssh-keyscan -H 192.168.10.11 >> /home/vagrant/.ssh/known_hosts
ssh-keyscan -H 192.168.10.12 >> /home/vagrant/.ssh/known_hosts
ssh-keyscan -H 192.168.10.13 >> /home/vagrant/.ssh/known_hosts
chown vagrant:vagrant /home/vagrant/.ssh/known_hosts

# reload ssh in order to load the known hosts
/etc/init.d/ssh reload