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How to set up Control and Managed nodes in Ansible
In the first part of setting up Ansible with PIP we have installed Ansible on Ubuntu 20.04 LTS that is our Control
Node, if you don't have Ansible installed on Control node than refer
How to install Ansible with PIP in Ubuntu.
Prerequisite for following this tutorial
- Control Node : VM having Ubuntu 18.04 LTS or above with Ansible installed.
- Managed Node : VM having Ubuntu 18.04 LTS or above with Python installed
This tutorial will walk through the steps for setting up Control Node, Managed Node and testing connection between Control Node and Managed Node.
Create ansible user on Managed Node
Ansible runs command as ansible user on managed node, so we need ansible user created on all managed nodes.
Run below command for creating ansible user, note down the password and IP as these details would be required in setting up control node.
ubuntu@managed-node-1:~$ sudo adduser ansible
Setting up Control Node for running ad-hoc commands
Till now we have Ansible running on Control Node and ansible user created on Managed Node. We need to perform below steps
to complete the set up on Control Node.
Managed Node in /etc/hosts of Control node
ansible@control-node:~$ sudo vi /etc/hosts
Add below entry in /etc/hosts, replace [IP] with IP of your Managed Node and save the configuration.
[IP] managed-node-1
Ansible project directory on Control Node
ansible@control-node:~$ cd /home/ansible;
ansible@control-node:~$ mkdir test-ansible;
ansible@control-node:~$ cd test-ansible;
ansible.cfg generated, we will create
it manually inside Ansible project directory that is test-ansible
ansible@control-node:~$ vi /home/ansible/test-ansible/ansible.cfg
Write below lines in ansible.cfg
[defaults]
inventory=./inventory
managed-node-1
ansible@control-node:~$ vi /home/ansible/test-ansible/hosts
Write below line in hosts
managed-node-1
Control node with default values
ansible@control-node:~$ ssh-keygen
managed-node-1, this will prompt for password provided for ansible user on Managed Node
ansible@control-node:~$ ssh-copy-id -i ~/.ssh/id_rsa ansible@managed-node-1
With these steps set up for both Control and Managed node is complete, lets verify connection with ping .
List all hosts in inventory
ansible@control-node:~$ ansible all -i hosts --list-hosts
Output
hosts (1):
managed-node-1
Execute ping command for all Managed Nodes, in this case we have only one node managed-node-1
ansible@control-node:~$ ansible -i hosts -m ping all
You should see output for managed nodes similar to the below one
managed-node-1 | SUCCESS => {
"ansible_facts": {
"discovered_interpreter_python": "/usr/bin/python"
},
"changed": false,
"ping": "pong"
}
If you are getting any error while following this tutorial, please post errors in comments, we will try to resolve those as soon as possible.
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Category: Linux
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