Engineer Builds Full AWS Network in 90 Lines of Terraform Code

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A developer has shared how a small Terraform project can provision an entire AWS network — including a VPC, two subnets, an internet gateway, a security group, and an EC2 instance — using just two commands. The setup replaces a tedious manual process of clicking through roughly fifteen AWS console screens, which often led to misconfigured route tables and connectivity failures. The project is organized across five files covering provider config, variables, core infrastructure, and outputs, making the setup fully reproducible. One subnet is configured as public with internet access via an internet gateway, while the second remains private and isolated. The author also highlights two specific pitfalls encountered during the build, aiming to help others avoid the same mistakes.

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