Ansible - Password-less SSH Playbook
In the blog Enable SSH Communication we saw how to establish SSH communication between ansible control machine and the nodes.
There we did generate a SSH key pair and copied the public key to nodes. All these tasks had to be done manually. Now we'll see a way to automate that too using a playbook.
Check for id_rsa file and create if not exist
Below task can be used to check if the id_rsa file already present in the control machine. If its there playbook will use the same key file else create a new key pair.
1- stat:2 path: "{{ id_rsa_file }}"3 register: op45 - name: Generating ssh key pair6 command: ssh-keygen -t rsa -b 4096 -f "{{ id_rsa_file }}" -q -N "{{ passphrase }}"7 when: op.stat.exists == false
Copy rsa public key to nodes
Below task copies the rsa public key to all the nodes.
1- name: Copy public key to the nodes2 command: sshpass -p "{{ root_password }}" ssh-copy-id -i "{{ id_rsa_file }}" root@"{{ item }}" -f -o StrictHostKeyChecking=no3 with_items:4 - "{{ nodes }}"
Here you can see, we have used with_items to loop. So this task copies the key to multiple nodes in a loop. And we will call a config.yml file where we have declared our variables.
1vars_files:2 - config.yml
config.yml
Below are the contents of config.yml.
1---2id_rsa_file: "/root/.ssh/id_rsa"3passphrase: "changeit"4root_password: "password"5nodes:6 - 1.2.3.47 - 5.6.7.88 - 9.10.11.12
Here as you see, we can add multiple servers under nodes. root_password will be the password which will be used to login to the nodes for copying the ssh public key.
Full playbook can be found in this git repo ansible-password-less-ssh.
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