VPC
Virtual Private Cloud
ELI5 — The Vibe Check
A VPC is your own private section of the AWS cloud — like a gated neighborhood where your servers live. Resources inside the VPC can talk to each other privately, and you control what's allowed in or out using firewalls. It keeps your servers isolated from everyone else's stuff on AWS.
Real Talk
A Virtual Private Cloud is a logically isolated network section within AWS where you launch resources. You define IP address ranges (CIDR blocks), subnets, route tables, internet gateways, and NAT gateways. VPCs provide network isolation, and security groups control traffic at the instance level.
Show Me The Code
# Create a VPC with a CIDR block
aws ec2 create-vpc --cidr-block 10.0.0.0/16
# Create a public subnet
aws ec2 create-subnet \
--vpc-id vpc-12345678 \
--cidr-block 10.0.1.0/24 \
--availability-zone us-east-1a
When You'll Hear This
"The database is in a private subnet inside the VPC — not publicly accessible." / "VPC peering connects two VPCs so services can communicate privately."
Related Terms
AWS (Amazon Web Services)
AWS is like a giant magical warehouse where you can rent computers, storage, databases, and basically anything tech-related — by the minute.
Cloud Computing
Cloud computing means using computers that live in someone else's giant warehouse instead of your own machine.
EC2 (Elastic Compute Cloud)
EC2 is AWS's way of renting you a virtual computer in the cloud. You pick how powerful it is, what OS it runs, and pay by the hour.
IAM (Identity and Access Management)
IAM is the permission system for AWS. It controls who (users, roles, services) can do what (read S3, start EC2, invoke Lambda) on which resources.
RDS (Relational Database Service)
RDS is Amazon's managed database service.
Security Group
A security group is a firewall for your cloud resources. You write rules like 'allow port 443 from anywhere' or 'allow port 5432 only from the app servers.