AWS IAM for Cloud Engineers: Roles and Policies
Learn AWS IAM the safe way: Identity Center, roles, policies, cross-account access, and least privilege, with a lab you can run in CloudShell.
What You'll Learn
Understanding Why IAM Exists
A payments team in Pune committed a deploy script to a public repository on a Friday evening.
Understanding How IAM Evaluates a Request
When AWS says AccessDenied, you need to know which layer said no.
Managing Human Access with IAM Identity Center
Your team of five engineers needs console and CLI access.
Reading and Writing IAM Policies
Policies are where security is actually decided.
Giving AWS Services Permissions with Roles
Your EC2 instance must read from S3. Putting an access key on the instance means that key lives on disk, gets copied into images, and never rotates.
Granting Cross-Account Access with Roles
Real companies run several AWS accounts: one for tooling, one for staging, one for production.
Skills You'll Master
Curriculum Index9 topics
Understanding Why IAM Exists
A payments team in Pune committed a deploy script to a public repository on a Friday evening.
Understanding How IAM Evaluates a Request
When AWS says AccessDenied, you need to know which layer said no.
Managing Human Access with IAM Identity Center
Your team of five engineers needs console and CLI access.
Reading and Writing IAM Policies
Policies are where security is actually decided.
Giving AWS Services Permissions with Roles
Your EC2 instance must read from S3. Putting an access key on the instance means that key lives on disk, gets copied...
Granting Cross-Account Access with Roles
Real companies run several AWS accounts: one for tooling, one for staging, one for production.
Implementing Least Privilege in Practice
Everyone agrees on least privilege, and almost everyone starts with wildcards.
Hands-on Lab: Prove a Role Can Read but Not Write
This lab runs entirely in AWS CloudShell, so you need no EC2 instance.
Quick Reference and Common Mistakes
Quick reference Common mistakes Attaching AdministratorAccess to get unblocked.
Career Impact
Roles that use the skills in this module.
DevSecOps Engineer
Platform Engineer
Cloud Engineer
DevOps Engineer
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Next Modules
Related Guides
Practice on the Coding Sheet
Not a software engineer sheet. Every problem comes from real DevOps, SRE, Platform and Cloud interviews, from your first script to a system you build yourself.
Open the Coding SheetFrequently Asked Questions
A user has long-term credentials such as a password or access keys. A role has no long-term credentials; something assumes it and receives short-lived credentials. Roles are the safer default for both services and people.
For people, use IAM Identity Center with permission sets instead. IAM users are for rare exceptions, such as a tool that cannot use roles or a tightly controlled break-glass account.
It means giving an identity only the actions and resources it needs for its job. You start with nothing, add what the job requires, and remove permissions that are never used.
Common causes are a missing resource ARN, an explicit Deny somewhere, an Organizations policy blocking the action, or a permissions boundary. Read the error message, then check each layer in order.