In Part 14 , I finished HMAC webhook signing. The backend was complete — JWT auth, PostgreSQL, Redis caching, rate limiting, circuit breaker, worker pool, webhook delivery, migrations, Docker. All running locally.

But "runs on my machine" isn't a portfolio project. It's a homework assignment.

Time to ship it.

The Stack Being Deployed

Go backend — ~15MB Docker image (multi-stage build, CGO_ENABLED=0)

PostgreSQL 16 — with golang-migrate running schema migrations on startup

Redis — for caching, rate limiting, and refresh token storage

Oracle Cloud Free Tier — 1GB RAM, 45GB disk, already provisioned

Everything wired together with docker-compose.yml . One command to start the entire stack.

Step 1: The VM Was Fine, Actually

I was worried about the free tier specs. Turned out the "1GB" in the tier name refers to RAM, not disk. The actual disk is 45GB — plenty.

free -h # 954MB RAM, 552MB available df -h # 45GB disk, 41GB free

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The real constraint: no swap .…