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This Ansible Playbook will assist on establishing passwordless SSH logins with the remote hosts you wish to manage. Passwordless logins is a great convenience when connecting to multiple servers, via Ansible or not!

Clone the repository to your ansible-enabled host:

git clone https://github.com/ilias-sp/ansible-setup-passwordless-ssh.git

Alternatively, you can download the ansible_setup_passwordless_ssh.yml and hosts from this repository.

Make sure your Ansible host is equipped with the utilities, and that they are available to the PATH of the user you will be running the playbook as.

• ssh-keygen
• ssh-copy-id
• sshpass

If you dont have them, before continuing you will have to install them using the recommended ways for your Linux distribution.

Edit the hosts file and define your environment's information. Fill in using the below matrix:

If you are planning to run the script towards multiple hosts, make sure the username/password you defined is the same to all of them!

[local_host]
localhost

[local_host:vars]
ssh_key_filename="ansible_rsa"
remote_machine_username="root"
remote_machine_password="root_password"


[ansible_setup_passwordless_setup_group]
rhel-green
rhel-red

run:

ansible-playbook -i hosts ansible_setup_passwordless_ssh.yml

Last task in the playbook is to connect to each of those hosts and run some commands ("hostname" and "id"), check the output to verify the success of the tool!

Output from Demo run

By running this playbook, these things happen to your hosts:

Localhost:

• An SSH key is generated and placed under .ssh folder. Its file name is configurable, default is ansible_rsa.
• This SSH key is added to the ~/.ssh/config file for SSH client to utilize it when connecting to remote hosts.

Remote hosts:

• The generated SSH key is propagated to the list of remote hosts you configured in hosts inventory file, and added to their ~/.ssh/authorized_keys file. This is done using the ssh-copy-id linux utility that is meant for this job. sshpass linux utility is used to assist running the script without the need to prompt for user password.

run:

ansible-playbook -i hosts ansible_setup_passwordless_ssh_rollback.yml

Output from Demo run of the rollback