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| 1 | +# Setting Up Control Node and Target Nodes Using Ansible 🌐🔧 |
| 2 | + |
| 3 | +## Overview |
| 4 | + |
| 5 | +This guide provides step-by-step instructions to set up a control node and two target nodes using Ansible, a powerful automation tool. Ansible simplifies the management and configuration of multiple nodes from a single control node. |
| 6 | + |
| 7 | +## Prerequisites 📋 |
| 8 | + |
| 9 | +- Control node and target nodes accessible over SSH |
| 10 | +- Ansible installed on the control node |
| 11 | +- Basic understanding of Ansible concepts (inventory, playbooks, etc.) |
| 12 | + |
| 13 | +## Step-by-Step Guide 🛠️ |
| 14 | + |
| 15 | +### Step 1: Install Ansible on Control Node |
| 16 | + |
| 17 | +1. **Update the package repository**: |
| 18 | + |
| 19 | + ```sh |
| 20 | + sudo apt update |
| 21 | + |
| 22 | +2. **Install Ansible:** |
| 23 | + ```sh |
| 24 | + sudo apt install ansible |
| 25 | +
|
| 26 | +3. **Verify Ansible installation:** |
| 27 | + ```sh |
| 28 | + ansible --version |
| 29 | + |
| 30 | +### Step 2: Configure SSH Access |
| 31 | + |
| 32 | +1. **Generate SSH keys on the control node (if not already done):** |
| 33 | + ```sh |
| 34 | + ssh-keygen |
| 35 | +
|
| 36 | +2. **Copy the SSH public key to the target nodes:** |
| 37 | + ```sh |
| 38 | + ssh-copy-id user@target-node1 |
| 39 | + ssh-copy-id user@target-node2 |
| 40 | + ``` |
| 41 | + Replace user with your username and target-node1, target-node2 with the respective IP addresses or hostnames of your target nodes. |
| 42 | + |
| 43 | +3. **Verify SSH connectivity to target nodes:** |
| 44 | + ```sh |
| 45 | + ssh user@target-node1 |
| 46 | + ssh user@target-node2 |
| 47 | + |
| 48 | +### Step 3: Configure Ansible Inventory |
| 49 | + |
| 50 | +1. **Create an Ansible inventory file (e.g., hosts.ini) on the control node:** |
| 51 | + ```ini |
| 52 | + [targets] |
| 53 | + target-node1 ansible_host=ip_address1 |
| 54 | + target-node2 ansible_host=ip_address2 |
| 55 | +
|
| 56 | + [targets:vars] |
| 57 | + ansible_user=user |
| 58 | + ``` |
| 59 | + Replace ip_address1, ip_address2 with the IP addresses or hostnames of your target nodes, and user with your SSH username. |
| 60 | + |
| 61 | +### Step 4: Write Ansible Playbook |
| 62 | + |
| 63 | +**Create an Ansible playbook (e.g., setup.yml) to configure the target nodes:** |
| 64 | + ```yaml |
| 65 | + --- |
| 66 | + - hosts: targets |
| 67 | + tasks: |
| 68 | + - name: Ensure NTP (Network Time Protocol) is installed |
| 69 | + package: |
| 70 | + name: ntp |
| 71 | + state: present |
| 72 | + |
| 73 | +``` |
| 74 | + Customize the playbook tasks according to your requirements. |
| 75 | + |
| 76 | +### Step 5: Run Ansible Playbook |
| 77 | + |
| 78 | +1. **Execute the Ansible playbook from the control node:** |
| 79 | + ```sh |
| 80 | + ansible-playbook -i hosts.ini setup.yml |
| 81 | +
|
| 82 | +2. **Verify configuration on target nodes:** |
| 83 | + ```sh |
| 84 | + ssh user@target-node1 |
| 85 | + systemctl status ntp |
| 86 | + |
| 87 | +Repeat for target-node2. |
| 88 | + |
| 89 | +### Conclusion 🎉 |
| 90 | + |
| 91 | +You have successfully set up a control node and configured two target nodes using Ansible. This setup enables centralized management and automation of tasks across your infrastructure. |
| 92 | + |
| 93 | + |
| 94 | + |
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| 96 | + |
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