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Rebuilding AWS Cloud Skills on Azure: A Week of Lessons in Networking and Cost Control

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A developer spent a week recreating familiar AWS architecture concepts on Microsoft Azure, starting with cost-conscious VM sizing and regional capacity limits. Subscription quotas on public IPs and forgotten resources, including an idle Bastion host that bills around $140 monthly, caused unexpected failures and cleanup work. The main project was a three-tier Book Review application with a Next.js frontend, a Node/Express API, and a managed MySQL database, each isolated in its own subnet with NSGs controlling traffic. The author debugged a series of issues, including a mistyped load balancer IP, an unquoted password character read as a comment, and a doubled API path, by testing each network hop in sequence. The week reinforced the value of querying the platform directly and critically reviewing instructions.

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