Learn (AWS IAM Overview)

April 22, 2026 by [email protected]

☁️ What You’ll Learn (AWS IAM Overview)

The image shows the main parts of AWS IAM (Identity and Access Management).

👉 IAM is used to control who can access AWS and what they can do.

🔹 1. AWS Policies

👉 Policies are rules (permissions)

• Define what actions are allowed or denied
• Written in JSON format
• Example:
  • Allow EC2 start/stop
  • Deny S3 delete

✅ Think: Policy = Permission rules

🔹 2. AWS Users

👉 Users are people or applications

• Each user has:
  • Username
  • Password / Access keys
• Used for login to AWS

✅ Think: User = Individual account

🔹 3. IAM Groups

👉 Groups are collections of users

• You can add multiple users to a group
• Assign one policy to the group

Example:

• “Developers” group → EC2 access
• “Admins” group → Full access

✅ Think: Group = Manage many users easily

🔹 4. IAM Roles

👉 Roles are temporary permissions

• Used by:
  • EC2 instances
  • Lambda
  • Other AWS services

Example:

• EC2 can access S3 without password

✅ Think: Role = Temporary access (no login needed)

🔹 5. IAM Best Practices

👉 Rules to keep AWS secure

• Don’t use root account
• Use least privilege
• Enable MFA (multi-factor authentication)
• Use roles instead of access keys

✅ Think: Best Practices = Security rules

🔥 Easy Way to Remember

👉 Simple formula:

User → belongs to → Group  
Group → has → Policies  
Role → gives temporary access  

🚀 Real-Life Example

• You create a User (Sumit)
• Add him to Developers Group
• Group has EC2 Policy
  👉 Now Sumit can manage EC2

🧠 Final Summary

Here’s a clear and simple English explanation of the IAM image 👇

☁️ What is IAM (Identity and Access Management)?

👉 IAM is an AWS service that helps you control:

• Who can access AWS
• What they can do

🔑 Key Features of IAM (from the image)

🔹 1. Shared Access to Your Account

👉 You can create multiple users in one AWS account

• Each user has separate login
• No need to share root account

✅ Simple: One account → many users

🔹 2. Granular Permissions

👉 You can give very specific permissions

• Control exactly what a user can do
• Follow least privilege

📌 Example:

• Only EC2 read access
• Full S3 access

✅ Simple: Give only required access

🔹 3. Secure Access to AWS Resources

👉 Keeps AWS resources secure

• Blocks unauthorized access
• Only allowed actions are permitted

✅ Simple: Security control

🔹 4. Identity Federation

👉 Login using external systems

📌 Example:

• Google login
• Company login (Active Directory)

✅ Simple: Use external login for AWS

🔹 5. Identity Information for Assurance

👉 Tracks user activity

• Logs who did what
• Helps in auditing and monitoring

✅ Simple: Tracking and auditing

🔹 6. PCI DSS Compliance

👉 Helps meet security standards

• Important for payment data security
• Ensures compliance

✅ Simple: Follow security standards

🔹 7. Password Policy

👉 Enforces strong passwords

• Minimum length
• Special characters
• Expiry rules

✅ Simple: Strong password rules

🔹 8. Multi-Factor Authentication (MFA)

👉 Adds extra security layer

• Password + OTP (2-step login)

✅ Simple: Extra login protection

🔥 Easy Formula to Remember

User → Login  
Policy → Permissions  
MFA → Extra Security  
Federation → External Login

🚀 Real-Life Example

• You create a User (Sumit)
• Enable MFA
• Attach a Policy (EC2 access)

👉 Result:
✔️ Secure login
✔️ Controlled access

🧠 Final Summary

AmazonEC2FullAccess is an AWS IAM policy that gives a user or group full access to Amazon EC2 and its related services.

🔹 What does the diagram show?

👤 Users
⬇️
They are assigned the AmazonEC2FullAccess policy

⬇️
They can access and control these services:

🖥️ 1. Amazon EC2

• Create, start, stop, and delete virtual servers (instances)
  👉 Basically: full control over servers

⚖️ 2. Elastic Load Balancer (ELB)

• Distributes incoming traffic across multiple EC2 instances
  👉 Helps prevent server overload

📊 3. Amazon CloudWatch

• Monitors performance (CPU, logs, metrics)
  👉 Helps track system health

🔄 4. Auto Scaling

• Automatically increases or decreases servers based on traffic
  👉 Handles scaling without manual work

🔹 In Simple Terms

👉 This policy allows a user to:

• Manage EC2 instances
• Control load balancing
• Monitor resources
• Configure auto scaling

👉 In short: Full control over the EC2 ecosystem

⚠️ Important Note

• This is a very powerful policy
• Should only be given to trusted users/admins
• Not recommended for regular users (security risk)

🔹 Real-Life Example

If you run a website:

• EC2 = your servers
• ELB = distributes user traffic
• CloudWatch = monitors performance
• Auto Scaling = adds/removes servers automatically

👉 With this policy, a user can control all of these

📘 Identity Federation — Simple English Explanation

🔹 What is Identity Federation?

Identity Federation allows users to log in to AWS using external accounts like:

• Google
• Facebook
• Microsoft Active Directory

👉 No need to create separate AWS usernames/passwords.

🔹 How it works (from the diagram)

1. 👤 User logs in using external provider
   (Google / Facebook / Active Directory)
2. 🔐 AWS IAM (Identity & Access Management)
   • Verifies the user
   • Assigns temporary permissions
3. ☁️ Access AWS Services
   • User can access EC2, S3, etc. based on permissions

🔹 Key Idea

👉 External Login → IAM Verification → Temporary AWS Access

🔹 Why use Identity Federation?

✔️ No need to manage multiple AWS accounts
✔️ More secure (temporary credentials)
✔️ Supports Single Sign-On (SSO)
✔️ Easy for companies to manage employees

🔹 Real-Life Example

Imagine a company:

• Employees log in using Active Directory (office login)
• They automatically get access to AWS resources

👉 This is Identity Federation in action

⚠️ Important

• Access is temporary, not permanent
• Permissions are controlled by IAM roles/policies
• Improves security and reduces risk

Granular Permissions in AWS mean giving very specific and limited access to users instead of full access.

👉 You control:

• Who can access
• What they can access
• What actions they can perform

🔹 What does the diagram show?

👥 Development Team (Users)
⬇️
They are given different levels of access

🔑 Types of Access in the image:

1. 🔸 Read/Write Access (Volume)
   • Can read and modify storage (EBS Volume)
2. 🔸 Admin Access
   • Full control over certain resources
3. 🔸 Limited Instance Access
   • Some EC2 instances are accessible
   • Some are locked (no access)

🔹 Key Concept

👉 Not all users get the same permissions
👉 Access is divided based on roles and needs

🔹 3 Main Controls

1. Service-level access
   • Example: Only EC2, not S3
2. Action-level permissions
   • Example: Can start EC2, but cannot delete
3. Resource-level access
   • Example: Access only specific instances, not all

🔹 Why is this important?

✔️ Improves security
✔️ Follows Least Privilege Principle
✔️ Prevents accidental mistakes
✔️ Better control over resources

🔹 Real-Life Example

In a company:

• Developer → Can start/stop EC2
• Admin → Full access
• Intern → Read-only access

👉 Everyone gets only what they need

🔹 One-Line Summary

👉 Granular Permissions = Right access to the right user for the right resource