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Kartik
Kartik

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How to install ansible and run your first ansible Ad-Hoc Command.

#devops #ansible #cloud #cloudcomputing

Install Ansible and Run Your First Playbook

Prerequisites

  1. Create two EC2 instances:
    • Main instance: Install Ansible.
    • Target instance: The system to configure.

Step 1: Install Ansible on the Main Instance

Commands:

sudo apt update sudo apt install ansible
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Verify Installation:

ansible --version
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Step 2: Set Up Passwordless Authentication

On the Main Instance:

  1. Generate an SSH Key Pair: 
 ssh-keygen
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The public key is usually located at ~/.ssh/id_rsa.pub.

  1. Copy the Public Key: Open the file with a text editor (e.g., vim) and copy its contents.

On the Target Instance:

  1. Log in: 
 ssh <username>@<target_server_ip>
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  1. Paste the Public Key into ~/.ssh/authorized_keys: 
 vim ~/.ssh/authorized_keys
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Save changes with :wq.

  1. Test SSH: From the main instance: 
 ssh <target_server_ip>
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Passwordless authentication should now work.

Step 3: Create an Inventory File

  1. Create a file named inventory: 
 [webservers] 192.168.1.10 192.168.1.11 [databases] 192.168.1.20
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Step 4: Run Ad-Hoc Commands

  1. Run a Command Across All Servers: 
 ansible -i inventory all -m shell -a "command_to_execute"
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  1. Example: 
 ansible -i inventory webservers -m shell -a "ls -la"
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Step 5: Write and Run Playbooks

  1. Create a Playbook (e.g., playbook.yml): 
 --- - name: Update and upgrade systems hosts: all become: yes tasks: - name: Update package lists apt: update_cache: yes - name: Upgrade packages apt: upgrade: yes
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  1. Run the Playbook: 
 ansible-playbook playbook.yml -i inventory
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By following these steps, you’ll have a basic Ansible setup to manage your infrastructure effortlessly.

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