Day 1: Ansible Installation and SSH Connection Setup

Ansible Installation on Master Node:

Architecture:

Access the master node:

```
  Copy codecd ~/.ssh
```

Generate SSH key pairs:

```
  ssh-keygen
```

Display the public key:

```
  cat id_rsa.pub
```
Copy the displayed key (id_rsa.pub) and paste it on the child node.

Access the child node:

```
  cd ~/.ssh
```

Edit the authorized_keys file:

```
  vi authorized_keys
```
Paste the master node's public key into the authorized_keys file.

SSH into the master node from the child node:

```
  ssh username@child_node_ip
```

Update the child node:

```
  sudo apt -y update
```

Install Ansible on the master node:

  sudo apt install software-properties-common
  sudo apt-add-repository --yes --update ppa:ansible/ansible
  sudo apt install ansible

Verify the Ansible installation:

```
  ansible --version
```

Configuring SSH Connections in Ansible:

Navigate to the Ansible configuration directory:
```
 cd /etc/ansible
```

Edit the inventory file:

```
  vi hosts
```

Define groups and add child nodes' IPs or hostnames:

  [group_name]
  child_node_ip_or_hostname

Save and exit the file.

Test the SSH connection to all nodes:

```
  ansible group_name -m ping
```

Display the inventory in YAML format:
```
 ansible-inventory --list --yaml
```

Additional Reference:

Ansible Installation Guide:https://docs.ansible.com/ansible/latest/installation_guide/installation_distros.html#installing-ansible-on-ubuntu

This comprehensive guide covers the installation of Ansible on both the master and child nodes, setting up SSH connections, and verifying the setup. Replace group_name, child_node, child_node_ip, and your_username with your actual details. This ensures a seamless and secure Ansible configuration for effective server management.