# 🚀 DevOps Week 3: AWS Services, Configuration Management & IaC

## 🔹 1. Why These AWS Services Matter?

*   AWS has **200+ services**, but DevOps engineers don’t need all
    
*   Focus should be on:
    
    *   🚀 Deployment
        
    *   ⚙️ Automation
        
    *   🔒 Security
        
    *   📊 Monitoring
        

👉 These 15 services help you **build, deploy, secure, and monitor applications in real-world projects**

* * *

## 🧱 2. Foundational Infrastructure (Base of Everything 🔥)

* * *

## 🔹 EC2 (Elastic Compute Cloud)

👉 What it is:

*   A **virtual server** in the cloud
    

👉 What you do with it:

*   Host websites
    
*   Run backend apps
    
*   Install software
    

👉 Real-world:

*   Like renting a computer on the internet
    

* * *

## 🔹 VPC (Virtual Private Cloud)

👉 What it is:

*   Your **private network in AWS**
    

👉 What you do:

*   Create subnets
    
*   Control traffic using security groups
    

👉 Real-world:

*   Like your company’s private office network
    

* * *

## 🔹 EBS (Elastic Block Storage)

👉 What it is:

*   Storage attached to EC2
    

👉 Use:

*   Store OS, database, application data
    

👉 Real-world:

*   Like a **hard disk for your cloud server**
    

* * *

## 🔹 S3 (Simple Storage Service)

👉 What it is:

*   Object storage
    

👉 Use:

*   Store images, backups, logs
    

👉 Features:

*   Highly scalable
    
*   Durable
    

👉 Real-world:

*   Like Google Drive but for applications
    

* * *

## 🔹 IAM (Identity & Access Management)

👉 What it is:

*   Security system of AWS
    

👉 Use:

*   Create users
    
*   Assign permissions
    

👉 Example:

*   Developer → access EC2
    
*   Admin → full access
    

👉 Real-world:

*   Like assigning roles in a company
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/a8104687-4ff1-482f-9172-01c2752ac2e4.png align="center")

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## 📊 3. Monitoring & Management

* * *

## 🔹 CloudWatch

👉 What it does:

*   Monitors AWS resources
    

👉 Tracks:

*   CPU usage
    
*   Logs
    
*   Errors
    

👉 Use:

*   Alerts when system fails
    

👉 Real-world:

*   Like a **health monitor for your server**
    

* * *

## 🔹 CloudTrail

👉 What it does:

*   Records all API activity
    

👉 Use:

*   Security auditing
    
*   Track “who did what”
    

👉 Example:

*   Who deleted EC2 instance?
    

* * *

## 🔹 AWS Config

👉 What it does:

*   Tracks configuration changes
    

👉 Use:

*   Ensure resources follow rules
    

👉 Example:

*   Check if security group is open or not
    

* * *

## 🔹 Billing & Cost Management

👉 What it does:

*   Tracks AWS spending
    

👉 Use:

*   Avoid unexpected bills
    

👉 Example:

*   Alert if cost > ₹5000
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/6dc0b0da-ca06-4508-8bac-b3b70f0c1fc3.png align="center")

* * *

## ⚙️ 4. Automation & CI/CD (DevOps Core 🔥)

* * *

## 🔹 Lambda (Serverless Computing)

👉 What it is:

*   Run code **without managing servers**
    

👉 Use:

*   Automation
    
*   Event-driven tasks
    

👉 Example:

*   Upload file → automatically process
    

* * *

## 🔹 CodePipeline

👉 What it is:

*   CI/CD pipeline tool
    

👉 Use:

*   Automate build → test → deploy
    

* * *

## 🔹 CodeBuild

👉 What it does:

*   Builds your code
    

👉 Example:

*   Convert source code → executable
    

* * *

## 🔹 CodeDeploy

👉 What it does:

*   Deploys code to servers
    

👉 Example:

*   Push new version to EC2
    

* * *

## 🔹 KMS (Key Management Service)

👉 What it does:

*   Manage encryption keys
    

👉 Use:

*   Secure sensitive data
    

* * *

## 📦 5. Containers & Logging

* * *

## 🔹 EKS (Elastic Kubernetes Service)

👉 What it is:

*   Managed Kubernetes
    

👉 Use:

*   Run container apps at scale
    

👉 Best for:

*   Large applications
    

* * *

## 🔹 ECS (Elastic Container Service)

👉 What it is:

*   AWS container service
    

👉 Use:

*   Run Docker containers
    

👉 Simpler than Kubernetes

* * *

## 🔹 ELK Stack (Elasticsearch)

👉 What it does:

*   Centralized logging
    

👉 Use:

*   Store logs
    
*   Analyze errors
    

👉 Example:

*   Debug microservices
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/833793c8-4db7-4195-9dc9-bba7482f47bf.png align="center")

* * *

## ⚔️ Important Comparisons (Interview Questions 🔥)

* * *

## 🔹 EC2 vs Lambda

| Feature | EC2 | Lambda |
| --- | --- | --- |
| Type | Server | Serverless |
| Control | Full control | Limited |
| Use | Long-running apps | Short tasks |
| Management | Manual | Automatic |

👉 Simple:

*   EC2 = Full machine
    
*   Lambda = Run code only
    

* * *

## 🔹 EKS vs ECS

| Feature | EKS | ECS |
| --- | --- | --- |
| Technology | Kubernetes | AWS native |
| Complexity | High | Low |
| Flexibility | High | Moderate |
| Setup | Complex | Easy |

👉 Simple:

*   EKS = Advanced (industry standard)
    
*   ECS = Beginner-friendly
    

* * *

## 🔄 6. Real DevOps Workflow Using AWS

## 👉 End-to-end flow:

1.  Developer pushes code
    
2.  CodePipeline triggers
    
3.  CodeBuild builds code
    
4.  CodeDeploy deploys to:
    
    *   EC2 / ECS / EKS
        
5.  Data stored in S3 / EBS
    
6.  IAM manages access
    
7.  CloudWatch monitors system
    
8.  CloudTrail logs activity
    

* * *

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/3531cc6d-4972-4e59-b525-a770f5649c5b.png align="center")

* * *

## Configuration Management (Ansible)

* * *

## 🔹 1. What is Configuration Management?

👉 Configuration Management = **Automating server setup, updates, and maintenance**

* * *

## ❌ Problem (Before Tools)

*   Manual work:
    
    *   Install software
        
    *   Update servers
        
    *   Apply security patches
        

👉 Issues:

*   Time-consuming
    
*   Errors
    
*   Not scalable (100+ servers)
    

* * *

## ✔ Solution

👉 Use tools like:

*   Ansible
    
*   Puppet
    
*   Chef
    
*   Salt
    

👉 These tools:

*   Automate configuration
    
*   Manage multiple servers easily
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/5d26bef9-f105-4e66-a5cc-500409d49a32.png align="center")

* * *

## 🔹 2. What is Ansible?

### 👉 Ansible = Configuration Management Tool

👉 Used for:

*   Server setup
    
*   Application deployment
    
*   Automation
    

* * *

## ✔ Key Features

*   Agentless (no software needed on server)
    
*   Uses SSH (Linux)
    
*   Uses WinRM (Windows)
    
*   Simple to use
    

* * *

## 🔹 3. Why Ansible is Popular? 🔥

* * *

## ✔ 1. Push Mechanism

👉 Ansible works on **Push model**

*   Control machine → sends commands to servers
    

👉 Easy to manage

* * *

## ✔ 2. Agentless Architecture

👉 No need to install agent on servers

👉 Just:

*   SSH connection
    

👉 Benefits:

*   Easy setup
    
*   Less maintenance
    

* * *

## ✔ 3. Simple Language (YAML)

👉 Uses YAML (easy to read)

Example:

```yaml
- name: Install nginx
  hosts: servers
  tasks:
    - name: Install package
      apt:
        name: nginx
        state: present
```

👉 Easy for beginners

* * *

## 🔹 4. Ansible Architecture

### 👉 Components:

*   Control Node → where Ansible runs
    
*   Managed Nodes → servers
    
*   Inventory → list of servers
    
*   Playbook → instructions (YAML file)
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/fc95ebbd-2160-41b1-85e8-34dcb6d3be04.png align="center")

* * *

## 🔹 5. Ansible vs Puppet (Important 🔥)

* * *

## ⚔️ Push vs Pull

| Feature | Ansible | Puppet |
| --- | --- | --- |
| Working | Push | Pull |
| Agent | Not required | Required |
| Language | YAML | Custom language |
| Setup | Easy | Complex |

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/65837dc9-8294-4b1e-a8dd-b4564022ccfd.png align="left")

* * *

## 👉 Simple Understanding:

*   Ansible = Simple + Fast + Beginner friendly
    
*   Puppet = Complex + Enterprise level
    

* * *

## 🔹 6. Limitations of Ansible

*   Slightly slower for very large systems
    
*   Debugging can be tricky
    

* * *

## 🔹 7. Ansible Community

👉 Strong community support

*   Ansible Galaxy 👉 Ready-made roles available
    

* * *

## 🔹 8. Programming Languages

*   Python → Backend
    
*   YAML → Playbooks
    

* * *

## 🔹 9. Cloud Support

### 👉 Ansible is **Cloud Agnostic**

Supports:

*   AWS
    
*   Azure
    
*   GCP
    

👉 Works anywhere with SSH/WinRM

* * *

## 🔹 10. OS Support

*   Linux → SSH
    
*   Windows → WinRM
    

* * *

## 🔹 11. Real DevOps Use Case

### 👉 Example:

### Instead of:

*   Installing software manually on 100 servers
    

👉 Use Ansible:

*   Run one command
    
*   Setup all servers automatically
    

* * *

## 🔹 12. Key Interview Points 🔥

*   What is configuration management?
    
*   What is Ansible?
    
*   Push vs Pull model?
    
*   Why Ansible is agentless?
    
*   YAML vs Puppet language?
    

* * *

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/4bc838d2-a47a-4b62-9c30-4804130f5d56.png align="center")

* * *

## Infrastructure as Code (IaC)

* * *

## 🔹 1. Problem with Traditional Infrastructure ❌

👉 Earlier, infrastructure was managed:

*   Manually (clicking in UI)
    
*   Or using cloud-specific tools
    

* * *

❌ Issues:

*   Time-consuming
    
*   Human errors
    
*   Not scalable
    
*   Hard to manage multiple environments
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/20707b86-ded3-4c0a-92a2-c35f481961ea.png align="center")

* * *

## ❌ Bigger Problem (Very Important 🔥)

### 👉 Every cloud has its own tools:

*   AWS → CloudFormation
    
*   Azure → ARM Templates
    
*   GCP → Deployment Manager
    

👉 If company switches cloud:

*   Need to learn new tools again
    
*   Maintain different scripts
    

👉 This creates **complexity & dependency**

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/38444438-714c-48ff-ab69-07d65a7123de.png align="center")

* * *

## 🔹 2. What is Infrastructure as Code (IaC)? ✔

👉 IaC = **Managing infrastructure using code instead of manual work**

* * *

## ✔ What you do:

*   Write code to:
    
    *   Create servers
        
    *   Setup networks
        
    *   Configure storage
        

👉 Instead of clicking → just run code

* * *

## ✔ Benefits:

*   Automation
    
*   Consistency
    
*   Reusability
    
*   Faster deployment
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/d81d8d5e-a280-43b2-a7a4-e02f85ee23b9.png align="center")

* * *

## 🔹 3. Role of Terraform 🔥

👉 Terraform = IaC tool (by HashiCorp)

* * *

✔ Why Terraform?

*   Works with:
    
    *   AWS
        
    *   Azure
        
    *   GCP
        

👉 Single tool for all clouds

* * *

## ✔ Key Advantage:

👉 No need to learn:

*   CloudFormation
    
*   ARM Templates
    

👉 Just learn Terraform once

* * *

## 🔹 4. How Terraform Works?

👉 Terraform uses: **API as Code concept**

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/f602e4ac-ce5c-4ea6-b28a-628c759f8afc.png align="center")

* * *

## 🔹 5. What is API as Code?

👉 API = **Bridge to communicate with services**

* * *

## ✔ Example:

Instead of:

*   Clicking in AWS UI
    

👉 Terraform:

*   Sends API requests automatically
    

* * *

## ✔ Flow:

```id="h0g2sd"
Terraform Code → API Calls → Cloud Provider → Resources Created
```

* * *

👉 Example:

*   Write code → EC2 created
    
*   Write code → S3 bucket created
    

* * *

## 🔹 6. Why IaC is Important in DevOps?

👉 DevOps focuses on:

*   Automation
    
*   Speed
    
*   Consistency
    

👉 IaC helps achieve all three

* * *

## ✔ Real Example:

Without IaC:

*   Setup server manually (30 min)
    

With IaC:

*   Run script → done in seconds
    

* * *

## 🔹 7. Key Advantages of IaC

*   🚀 Faster deployment
    
*   ⚡ Automation
    
*   🔁 Repeatable setup
    
*   🐞 Less human error
    
*   🌐 Multi-cloud support
    

* * *

## 🔹 8. Terraform vs Cloud-Specific Tools

| Feature | Terraform | Cloud Tools |
| --- | --- | --- |
| Multi-cloud | Yes | No |
| Learning | One tool | Multiple tools |
| Flexibility | High | Limited |

* * *

## 🔹 9. Real DevOps Workflow (IaC)

1.  Write Terraform code
    
2.  Run command (`terraform apply`)
    
3.  API calls sent
    
4.  Infrastructure created automatically
    

* * *

Project link - https://github.com/hritikranjan1/first\_terraform\_project.git

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/dfeeec19-e1eb-47e2-aea5-073805fa3c6c.png align="center")

  

* * *

# 🚀 Continue Your Learning Journey

Thank you for taking the time to read this article.

Technology is evolving rapidly, and continuous learning is one of the most valuable investments you can make in your career. Whether you're exploring **DevOps, Cloud Computing, Artificial Intelligence, Cybersecurity, Software Development, Data Science, or Career Growth**, the resources below can help you deepen your knowledge and stay ahead in the industry.

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# ❤️ Support My Work

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If you find my articles helpful and would like to support my work, you can do so through the following platforms:

## ⭐ Become a GitHub Sponsor

Support my open-source contributions, technical content, and community projects.

🔗 https://github.com/sponsors/hritikranjan1

* * *

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* * *

# 👨‍💻 Connect With Me

**Hritik Ranjan**

💡 AI Enthusiast ☁️ DevOps Learner 🔐 Cybersecurity Advocate 💻 Software Developer

### Connect & Follow

🔗 GitHub: https://github.com/hritikranjan1

🔗 LinkedIn: https://linkedin.com/in/hritikranjan1

* * *

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