Day 01 – Ansible Hands-On with SSH Trust & Terraform Integration

Day 01

Agenda

00:00–02:00
Participant Ramakrishna showcased Terraform + Tomcat setup via CI/CD pipeline
✅ Jenkins webhook was triggering (200 OK), but Jenkins wasn’t receiving build requests

02:00–06:00
Trainer guided on GitHub-Jenkins integration troubleshooting
Motivated participants to explore Terraform modules beyond AWS — even for Docker, Jenkins, etc.

06:00–13:00
Deep dive into Ansible setup on Ubuntu EC2 in Stockholm region
✅ Chose T3.micro instance (2 CPUs), installed Ansible using shell script via GitHub Gist
Explained Ansible controller setup & prerequisites (Python already present)

13:00–24:00
Created multiple Ansible-managed nodes
Copied controller’s SSH public key into managed nodes using Terraform-based approach
✅ Emphasized Ansible’s agentless SSH-based architecture

24:00–33:00
Successfully established SSH trust from controller to nodes
Explained inventory file /etc/ansible/hosts, added private IPs
Validated nodes using ansible all -m ping

33:00–40:00
Demonstrated inventory grouping (valid/invalid hosts)
Covered targeting by:
▪️ All nodes
▪️ Single IP
▪️ Group

40:00–43:00
️ Introduced custom inventory file usage with -i flag
Emphasized /etc/ansible/hosts as the default inventory

43:00–49:00
Explained Ansible command structure:
ansible <target> -m <module> -a <arguments>
️ Sample: apt for installing packages, copy for file transfer, etc.

49:00–57:00
Created a students.txt file on controller and used copy module to push it to all targets
Demonstrated idempotency (file copied only if changed)

57:00–1:02:00
Color meanings in Ansible output:
Yellow = Change occurred
Green = No change (desired state)
Red = Error
Trainer shared real-life experience + announced break until Friday for extended session with Terraform + Ansible + Jenkins