# DevOps Week 1: My Journey Begins 🚀

## 1\. 🔹 What is DevOps?

*   DevOps = **Development + Operations**
    
*   It is a **culture + process + tools** that helps teams:
    
    *   Build software faster
        
    *   Deploy quickly
        
    *   Reduce errors
        

👉 Goal: **Faster delivery + High quality + Automation**

* * *

## 2\. 🔹 Why DevOps is Needed?

Traditional model problems:

*   Dev team builds code
    
*   Ops team deploys
    
*   ❌ Communication gap
    
*   ❌ Slow delivery
    
*   ❌ More bugs
    

DevOps solves:

*   ✔ Collaboration
    
*   ✔ Automation
    
*   ✔ Continuous delivery
    

* * *

## 3\. 🔹 DevOps Lifecycle (Very Important)

### 1\. Planning

*   Requirement gathering
    
*   Tools: Jira, Trello
    

### 2\. Development

*   Writing code
    
*   Tools: Git, GitHub
    

### 3\. Build

*   Convert code → executable
    
*   Tools: Maven, Gradle
    

### 4\. Testing

*   Manual + Automated testing
    
*   Tools: Selenium, JUnit
    

### 5\. Release

*   Prepare for deployment
    

### 6\. Deployment

*   Push to server
    
*   Tools: Docker, Kubernetes
    

### 7\. Operations

*   Run application
    

### 8\. Monitoring

*   Track performance
    
*   Tools: Prometheus, Grafana
    

* * *

## 4\. 🔹 Key DevOps Concepts

### ✔ CI (Continuous Integration)

*   Code is merged frequently
    
*   Detect bugs early
    

### ✔ CD (Continuous Delivery / Deployment)

*   Automatic deployment
    
*   Faster release cycle
    

### ✔ Automation

*   Reduces manual work
    

### ✔ Infrastructure as Code (IaC)

*   Manage infra using code
    
*   Tools: Terraform, Ansible
    
    ![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/b7edd12c-9c76-401b-a9bb-ae9fe8221e49.png align="center")
    

* * *

## 5\. 🔹 Important DevOps Tools (Must Know)

### 🔸 Version Control

*   Git, GitHub
    

### 🔸 CI/CD Tools

*   Jenkins, GitLab CI
    

### 🔸 Containerization

*   Docker
    

### 🔸 Orchestration

*   Kubernetes
    

### 🔸 Configuration Management

*   Ansible, Puppet
    

### 🔸 Cloud Platforms

*   AWS, Azure, GCP
    

* * *

## 6\. 🔹 DevOps Pipeline (Flow)

👉 Code → Build → Test → Deploy → Monitor

*   Fully automated pipeline
    
*   Improves efficiency
    
*   Reduces human errors
    

* * *

## 7\. 🔹 Benefits of DevOps

*   🚀 Faster delivery
    
*   🔄 Continuous updates
    
*   🐞 Fewer bugs
    
*   🤝 Better teamwork
    
*   ⚡ High efficiency
    

* * *

## 8\. 🔹 Real-World Example

Without DevOps:

*   App update takes weeks
    

With DevOps:

*   App update takes minutes/hours
    

* * *

## 9\. 🔹 DevOps Engineer Role

Responsibilities:

*   Manage CI/CD pipelines
    
*   Automate deployment
    
*   Monitor systems
    
*   Work with cloud & containers
    

Skills required:

*   Linux
    
*   Networking
    
*   Scripting (Python/Bash)
    
*   Cloud (AWS, Azure)
    
*   Tools (Docker, Jenkins, Kubernetes)
    

* * *

# 2\. Software Development Lifecycle (SDLC)

## 📌 Traditional Flow:

1.  Requirement
    
2.  Development
    
3.  Testing
    
4.  Deployment
    

❌ Problems:

*   Slow
    
*   Manual work
    
*   Communication gap
    

* * *

## 📌 DevOps-Based Flow:

*   Continuous process
    
*   Automated pipeline
    
*   Faster delivery
    

* * *

# 🔹 3. DevOps Lifecycle (Important 🔥)

### 🔄 Steps:

1.  **Plan**
    
    *   Requirement gathering
        
    *   Tools: Jira
        
2.  **Code**
    
    *   Development using Git
        
3.  **Build**
    
    *   Convert code → executable
        
    *   Tools: Maven / Gradle
        
4.  **Test**
    
    *   Automated testing
        
    *   Tools: Selenium, JUnit
        
5.  **Release**
    
    *   Prepare for deployment
        
6.  **Deploy**
    
    *   Deploy on server/cloud
        
7.  **Monitor**
    
    *   Track performance
        

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/fbc238c5-be9f-4f74-80e8-3f356320cb2f.png align="center")

* * *

# 🔹 4. CI/CD Pipeline (Core Concept)

## ✔ CI (Continuous Integration)

*   Developers push code regularly
    
*   Auto build + test
    

## ✔ CD (Continuous Delivery / Deployment)

*   Auto deployment to server
    

* * *

## 🔄 Pipeline Flow:

👉 Code → Build → Test → Deploy → Monitor

* * *

## 🎯 Benefits:

*   Faster delivery
    
*   Less bugs
    
*   Automation
    

📌 Video emphasizes:

👉 “Automation is the heart of DevOps”

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/d56070c7-60ad-4332-a5ce-a081f2ad8b71.png align="center")

* * *

# 🔹 5. Git & Version Control

## ✔ Git:

*   Track code changes
    
*   Collaboration tool
    

## ✔ GitHub:

*   Remote repository
    

* * *

## 📌 Commands (basic idea):

*   `git clone`
    
*   `git add`
    
*   `git commit`
    
*   `git push`
    

* * *

# 🔹 6. Jenkins (CI/CD Tool)

## ✔ What Jenkins Does:

*   Automates pipeline
    

## 📌 Workflow:

1.  Code pushed to GitHub
    
2.  Jenkins triggers build
    
3.  Run tests
    
4.  Deploy automatically
    

* * *

## 🎯 Key Feature:

*   Pipeline as code (Jenkinsfile)
    

* * *

# 🔹 7. Docker (Containerization)

## ✔ Problem Solved:

*   “It works on my machine” issue
    

## ✔ Solution:

*   Package app + dependencies
    

* * *

## 📌 Docker Concepts:

*   Image
    
*   Container
    
*   Dockerfile
    

* * *

## ✔ Benefits:

*   Lightweight
    
*   Fast
    
*   Portable
    

* * *

# 🔹 8. Kubernetes (K8s)

## ✔ Role:

*   Manage containers at scale
    

* * *

## 📌 Features:

*   Auto scaling
    
*   Load balancing
    
*   Self-healing
    

* * *

## ✔ Used For:

*   Microservices architecture
    

* * *

# 🔹 9. Cloud Computing

## ✔ Why Cloud?

*   No physical servers
    
*   Pay-as-you-go
    

* * *

## 📌 Platforms:

*   AWS
    
*   Azure
    
*   GCP
    

* * *

## ✔ Services:

*   Compute (EC2)
    
*   Storage (S3)
    
*   Networking
    

* * *

# 🔹 10. Infrastructure as Code (IaC)

## ✔ Meaning:

*   Write infra using code
    

* * *

## 📌 Tools:

*   Terraform
    
*   Ansible
    

* * *

## ✔ Benefits:

*   Automation
    
*   Consistency
    
*   Easy scaling
    

* * *

# 🔹 11. Monitoring & Logging

## ✔ Why Important?

*   Detect issues
    
*   Improve performance
    

* * *

## 📌 Tools:

*   Prometheus
    
*   Grafana
    

* * *

# 🔹 12. Real-World DevOps Workflow (Most Important 🔥)

👉 This is what companies actually do:

1.  Developer writes code
    
2.  Push to GitHub
    
3.  Jenkins triggers pipeline
    
4.  Docker builds container
    
5.  Kubernetes deploys app
    
6.  Cloud hosts application
    
7.  Monitoring tools track performance
    

* * *

# 🔹 13. DevOps Tools Stack

| Category | Tools |
| --- | --- |
| Version Control | Git, GitHub |
| CI/CD | Jenkins |
| Container | Docker |
| Orchestration | Kubernetes |
| Cloud | AWS |
| Monitoring | Grafana |

* * *

# 🔹 14. Benefits of DevOps

*   🚀 Faster delivery
    
*   ⚡ Automation
    
*   🔁 Continuous updates
    
*   🐞 Less bugs
    
*   🤝 Better teamwork
    

* * *

# 🔹 15. Interview Questions

1.  What is DevOps?
    
2.  Difference between CI & CD?
    
3.  What is Docker?
    
4.  What is Kubernetes?
    
5.  What is Jenkins?
    
6.  Explain DevOps lifecycle
    
7.  What is IaC?
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/22ac7c33-e9aa-4eaa-967f-92be27964012.png align="center")

# What is a Virtual Machine (VM)?

*   A **Virtual Machine (VM)** is: 👉 A **software-based computer** running inside a physical computer
    
*   It behaves like:
    
    *   Real computer
        
    *   Has OS, CPU, RAM, storage
        

👉 Example:

*   Your laptop = Physical machine
    
*   Inside it → multiple VMs (Windows, Linux)
    

* * *

# 🔹 2. Why Virtual Machines are Needed?

## ❌ Problem (Before VM):

*   One server = One OS
    
*   Resources wasted:
    
    *   CPU idle
        
    *   RAM unused
        

## ✔ Solution (VM):

*   Run multiple OS on one system
    
*   Better resource usage
    

👉 Result:

*   Cost saving
    
*   Efficient system usage
    

📌 VMs improve resource efficiency by running multiple isolated environments on one server

* * *

# 🔹 3. Concept of Virtualization

## ✔ Virtualization = Core Idea

*   Divide one physical machine into multiple virtual machines
    

👉 Each VM:

*   Independent
    
*   Isolated
    
*   Secure
    

* * *

## 🧠 Example (Easy Analogy)

*   Land = Physical server
    
*   Houses = Virtual machines
    

👉 Instead of one big house:

*   Build multiple small houses
    
*   Use land efficiently
    

* * *

# 🔹 4. Hypervisor (Very Important 🔥)

## ✔ What is Hypervisor?

*   Software that **creates & manages VMs**
    

👉 It sits between:

*   Hardware
    
*   Virtual machines
    

* * *

## 📌 Types of Hypervisor:

### 1\. Type 1 (Bare Metal)

*   Directly on hardware
    
*   Faster & efficient
    

👉 Examples:

*   VMware ESXi
    
*   Microsoft Hyper-V
    

* * *

### 2\. Type 2 (Hosted)

*   Runs on OS
    

👉 Examples:

*   VirtualBox
    
*   VMware Workstation
    

* * *

## 🎯 Role of Hypervisor:

*   Allocate CPU, RAM
    
*   Manage VMs
    
*   Ensure isolation
    

📌 Hypervisors enable cloud providers to offer scalable resources

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/bfa66934-3828-45d9-a833-9a18c4c29e4b.png align="center")

* * *

# 🔹 5. Virtual Machines in Cloud

## ✔ Cloud Providers Use VMs

👉 Example:

*   AWS EC2
    
*   Azure VM
    

* * *

## 📌 How it Works:

1.  Physical server (data center)
    
2.  Hypervisor installed
    
3.  Multiple VMs created
    
4.  Users rent VMs
    

* * *

## 🎯 Benefit:

*   Pay only for usage
    
*   Scalable resources
    

* * *

# 🔹 6. VM vs Physical Machine

| Feature | Physical Machine | Virtual Machine |
| --- | --- | --- |
| Cost | High | Low |
| Resource Usage | Wasted | Optimized |
| Flexibility | Low | High |
| Scalability | Limited | Easy |

* * *

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/f86c89bb-0620-4a11-994e-effbaa38833e.png align="center")

# 🔹 7. Advantages of Virtual Machines

*   ✔ Better resource utilization
    
*   ✔ Cost efficient
    
*   ✔ Isolation (secure)
    
*   ✔ Easy backup & recovery
    
*   ✔ Run multiple OS
    

* * *

# 🔹 8. Limitations of VM

*   ❌ Heavy (needs full OS)
    
*   ❌ Slower than containers
    
*   ❌ More resource usage
    

* * *

# 🔹 9. VM vs Containers (Important 🔥)

| Feature | VM | Container |
| --- | --- | --- |
| OS | Full OS | Shared OS |
| Size | Heavy | Lightweight |
| Speed | Slow | Fast |

👉 Containers (Docker) are more efficient than VMs

* * *

# 🔹 10. Role of VM in DevOps

VM is used for:

*   Testing environments
    
*   Running applications
    
*   Cloud deployment
    

* * *

## 🔄 DevOps Flow with VM:

1.  Developer writes code
    
2.  Deploy on VM
    
3.  Test application
    
4.  Scale using cloud
    

* * *

# 🔹 11. Real-World Example

👉 Company server:

*   Without VM → 1 app only
    
*   With VM → multiple apps
    

👉 Saves:

*   Cost
    
*   Infrastructure
    

* * *

# 🔹 12. Key Takeaways

*   VM = Virtual computer
    
*   Virtualization = Divide resources
    
*   Hypervisor = VM manager
    
*   Cloud = Uses VMs
    
*   Goal = Efficiency + Cost saving
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/d9867993-6c03-49ad-bbb5-b9fc17c7b4c2.png align="center")

# AWS & Azure – How to Create Virtual Machines

## 🔹 A. AWS EC2 (Virtual Machine Creation)

### 📌 Step-by-Step Process:

1.  Login to AWS Console
    
2.  Go to **EC2 Dashboard**
    
3.  Click **Launch Instance**
    
4.  Enter:
    
    *   Instance Name
        
    *   OS (AMI – Amazon Linux / Ubuntu)
        
5.  Select Instance Type
    
    *   e.g., t2.micro (Free tier)
        
6.  Create / Select **Key Pair (.pem file)**
    
7.  Configure Network:
    
    *   Enable Public IP
        
    *   Security Group → Allow SSH (Port 22)
        
8.  Click **Launch Instance**
    

👉 EC2 instance = Virtual Server in AWS Cloud ([AWS Documentation](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/EC2_GetStarted.html?utm_source=chatgpt.com))

* * *

## 🔹 Important Concepts (From Video)

*   **AMI** → OS template
    
*   **Key Pair** → Used for login
    
*   **Security Group** → Firewall
    
*   **Instance Type** → CPU + RAM
    

* * *

## 🔹 Azure VM (Similar Steps)

1.  Go to Azure Portal
    
2.  Create Virtual Machine
    
3.  Select:
    
    *   Image (Ubuntu/Windows)
        
    *   Size
        
4.  Configure:
    
    *   Username + Password / SSH
        
5.  Open ports (22/3389)
    
6.  Deploy VM
    

* * *

## 🔥 Key Difference (AWS vs Azure)

| AWS | Azure |
| --- | --- |
| EC2 | Virtual Machine |
| Key Pair (.pem) | Username + Password |
| Security Group | Network Security Group |

* * *

# 🎥 2. Connect to EC2 from Windows (MobaXterm)

## 🔹 What is MobaXterm?

*   SSH tool for Windows
    
*   Used to connect Linux servers easily
    

* * *

## 🔹 Steps to Connect EC2 using MobaXterm

### 📌 Step 1: Download MobaXterm

*   Install & open app
    

### 📌 Step 2: Get EC2 Details

From AWS:

*   Public IP
    
*   Username (ec2-user / ubuntu)
    
*   .pem key file
    

* * *

### 📌 Step 3: Create Session

1.  Click **Session → SSH**
    
2.  Enter:
    
    *   Remote host = EC2 Public IP
        
    *   Username
        
3.  Go to **Advanced Settings**
    
    *   Select your `.pem` file
        

* * *

### 📌 Step 4: Connect

*   Click OK
    
*   Terminal opens → connected to EC2
    

👉 MobaXterm uses SSH with `.pem` key authentication ([Braincuber Technologies](https://www.braincuber.com/tutorial/mobaxterm-ec2-connection-guide?utm_source=chatgpt.com))

* * *

## 🔹 Common Errors (Important)

*   ❌ Permission denied → Wrong key
    
*   ❌ Timeout → Security group issue
    
*   ❌ Host unreachable → No public IP
    

* * *

# 🎥 3. AWS CLI + Connect EC2 (UI & Terminal + CFT)

* * *

# 🔹 A. Connect EC2 from AWS UI (Browser)

### 📌 Steps:

1.  Go to EC2 → Instances
    
2.  Select instance
    
3.  Click **Connect**
    
4.  Choose:
    
    *   EC2 Instance Connect
        
5.  Click Connect
    

👉 Opens terminal in browser

👉 AWS pushes temporary SSH key for login ([AWS Documentation](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-tutorial.html?utm_source=chatgpt.com))

* * *

# 🔹 B. Connect EC2 via Terminal (CLI)

## 📌 Command:

```bash
ssh -i your-key.pem ec2-user@public-ip
```

### ✔ Explanation:

*   `i` → key file
    
*   `ec2-user` → username
    
*   `public-ip` → EC2 IP
    

* * *

## 🔹 Steps:

1.  Open terminal (Git Bash / CMD)
    
2.  Navigate to key location
    
3.  Run SSH command
    
4.  Connected to server
    

* * *

# 🔹 C. AWS CLI Basics (From Video)

## 📌 Install AWS CLI

*   Download from AWS site
    
*   Configure:
    

```bash
aws configure
```

Enter:

*   Access Key
    
*   Secret Key
    
*   Region
    

* * *

## 📌 Common Commands:

*   List instances:
    

```bash
aws ec2 describe-instances
```

*   Start instance:
    

```bash
aws ec2 start-instances --instance-ids <id>
```

*   Stop instance:
    

```bash
aws ec2 stop-instances --instance-ids <id>
```

* * *

# 🔹 D. CloudFormation (CFT Overview)

## ✔ What is CFT?

*   Infrastructure as Code tool
    

## 📌 Use:

*   Create EC2 using template
    

* * *

## ✔ Benefits:

*   Automation
    
*   Repeatable setup
    
*   No manual work
    

![](https://cdn.hashnode.com/uploads/covers/66fecde7cb0abd844c1a2f3c/1761c547-de90-4c09-bbe3-43476b842d11.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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* * *

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* * *

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* * *

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* * *

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* * *

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* * *

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* * *

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* * *

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* * *

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* * *

# ❤️ Support My Work

Creating detailed technical content, tutorials, guides, and learning resources takes significant time and effort.

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

* * *

## ☕ Buy Me a Chai

Enjoying my content? Consider buying me a chai and supporting future tutorials, guides, and educational resources.

🔗 https://www.chai4.me/hritikranjan

* * *

# 👨‍💻 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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