ansible ssh prompt known_hosts issue

Question

I\'m running Ansible playbook and it works fine on one machine.

On a new machine when I try for the first time, I get the following error.

17:04:34          


        

Answer 1

The ansible docs have a section on this. Quoting:

Ansible 1.2.1 and later have host key checking enabled by default.

If a host is reinstalled and has a different key in ‘known_hosts’, this will result in an error message until corrected. If a host is not initially in ‘known_hosts’ this will result in prompting for confirmation of the key, which results in an interactive experience if using Ansible, from say, cron. You might not want this.

If you understand the implications and wish to disable this behavior, you can do so by editing /etc/ansible/ansible.cfg or ~/.ansible.cfg:

[defaults]
host_key_checking = False

Alternatively this can be set by an environment variable:

$ export ANSIBLE_HOST_KEY_CHECKING=False

Also note that host key checking in paramiko mode is reasonably slow, therefore switching to ‘ssh’ is also recommended when using this feature.

Answer 2

Wouldn't doing something like this work for priming the known_hosts file:

ANSIBLE_HOST_KEY_CHECKING=false ansible all -m ping

This should connect to each hosts in the inventory, updating the known_hosts file for each host without having to enter "yes" for each prompt, then runs the "ping" module on each host?

A quick test (deleting my known_hosts file then running the above, done on an Ubuntu 16.04 instance) seemed to populate the known_hosts file with their current fingerprints.

@Stepan Vavra's solution didn't work for me as I was using aliased hosts (was connecting to internal IPs which didn't have DNS available for them, so I wanted more descriptive names to refer to each hosts in the inventory and having ansible_host variable point to the actual IP for each). Running the above was much simpler and primed my known_hosts file without having to disable host key checking in ansible or ssh.

Answer 3

To update local known_hosts file, I ended up using a combination of ssh-keyscan (with dig to resolve a hostname to IP address) and ansible module known_hosts as follows: (filename ssh-known_hosts.yml)

- name: Store known hosts of 'all' the hosts in the inventory file
  hosts: localhost
  connection: local

  vars:
    ssh_known_hosts_command: "ssh-keyscan -T 10"
    ssh_known_hosts_file: "{{ lookup('env','HOME') + '/.ssh/known_hosts' }}"
    ssh_known_hosts: "{{ groups['all'] }}"

  tasks:

  - name: For each host, scan for its ssh public key
    shell: "ssh-keyscan {{ item }},`dig +short {{ item }}`"
    with_items: "{{ ssh_known_hosts }}"
    register: ssh_known_host_results
    ignore_errors: yes

  - name: Add/update the public key in the '{{ ssh_known_hosts_file }}'
    known_hosts:
      name: "{{ item.item }}"
      key: "{{ item.stdout }}"
      path: "{{ ssh_known_hosts_file }}"
    with_items: "{{ ssh_known_host_results.results }}"

To execute such yml, do

ANSIBLE_HOST_KEY_CHECKING=false ansible-playbook path/to/the/yml/above/ssh-known_hosts.yml

As a result, for each host in the inventory, all supported algorithms will be added/updated in the known_hosts file under hostname,ipaddress pair record; such as

atlanta1.my.com,10.0.5.2 ecdsa-sha2-nistp256 AAAAEjZHN ... NobYTIGgtbdv3K+w=
atlanta1.my.com,10.0.5.2 ssh-rsa AAAAB3NaC1y ... JTyWisGpFeRB+VTKQ7
atlanta1.my.com,10.0.5.2 ssh-ed25519 AAAAC3NaCZD ... UteryYr
denver8.my.com,10.2.13.3 ssh-rsa AAAAB3NFC2 ... 3tGDQDSfJD
...

(Provided the inventory file looks like:

[master]
atlanta1.my.com
atlanta2.my.com

[slave]
denver1.my.com
denver8.my.com

)

As opposed to the Xiong's answer, this would properly handle the content of the known_hosts file.

This play is especially helpful if using virtualized environment where the target hosts get re-imaged (thus the ssh pub keys get changed).

Answer 4

Following @Stepan Vavra's correct answer. A shorter version is:

- known_hosts:
    name: "{{ item }}"
    key: "{{ lookup('pipe', 'ssh-keyscan {{ item }},`dig +short {{ item }}`') }}"
  with_items:
   - google.com
   - github.com

Answer 5

Disabling host key checking entirely is a bad idea from a security perspective, since it opens you up to man-in-the-middle attacks.

If you can assume the current network isn't compromised (that is, when you ssh to the machine for the first time and are presented a key, that key is in fact of the machine and not an attacker's), then you can use ssh-keyscan and the shell module to add the new servers' keys to your known hosts file (edit: Stepan's answer does this a better way):

- name: accept new ssh fingerprints
  shell: ssh-keyscan -H {{ item.public_ip }} >> ~/.ssh/known_hosts
  with_items: ec2.instances

(Demonstrated here as you would find after ec2 provisioning.)

Answer 6

I've created this shell script (also works from Jenkins, btw)

my_known_hosts="$HOME/.ssh/known_hosts"
## housekeeping ##
if [ -f $my_known_hosts".old" ] 
    then rm -f $my_known_hosts".old"
fi
## housekeeping ##
## backup ##
if [ -f $my_known_hosts ] 
    then mv $my_known_hosts "$my_known_hosts.old"
fi
## backup ##
## query aws for active hosts and add to known_hosts
aws ec2 describe-instances --query 'Reservations[*].Instances[*].NetworkInterfaces[*].Association.PublicDnsName' --output text | xargs -L1 ssh-keyscan -H >> $my_known_hosts
## query aws for active hosts and add to known_hosts

https://admin-o-mat.blogspot.com/2020/09/ansible-and-aws-adding-hosts-to.html