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World A4: Containers in the Cloud

RDS: a managed database

You will learn: what RDS does for you, how Multi-AZ saves you, and how to keep the database in back.

Checked with AWS 2026-11 on 1 Nov 2026

The problem

Tap each point on the timeline.

Databases need backups, patches and a spare. Every day. Tap the story. Could someone else do the boring parts?

Watch

RDS: Relational Database Service: a managed database with backups and updates done for you. is a managed database: Postgres, MySQL and others. AWS does the boring parts. Some parts stay yours. Sort them.

Drag a card into a box. Or tap the card, then tap the box.

      Watch

      Multi-AZ: A standby copy of your database in another wing. If one wing fails, the standby takes over. keeps a standby copy in another wing. The wing with your database loses power. What happens?

      Try it

      The database lives in a private row. Only the app group, sg-app, may use port 5432. Not even your laptop.

      Set the door guard's rules. Only the right visitors get in.

      Visitors

      • Kedai Kancil taskshould get inTCP 5432 from 10.0.1.25, a server in sg-appIts replies go back to ports 32768–61000.
      • Your laptopkeep outTCP 5432 from 203.0.113.9Its replies go back to ports 32768–61000.
      • Strangerkeep outTCP 5432 from 192.0.2.77Its replies go back to ports 32768–61000.

      Unit door · security group (the server)

      Allow rules only. It remembers who came in, so replies always go out.

      In

      No In rules yet: nothing gets in.

      Out: all traffic (a new group starts this way).

      Predict

      You stop a test database to save money, and forget it for a month. What happens?

      Check

      Running or resting, which database parts cost money?

      One at a time: does it keep costing money while it sits idle?

      1 of 4

      RDS database nobody queries

      On the bill (costs even when idle)

      Nothing here yet.

      Free shelf (free when idle)

      Nothing here yet.

      Check

      The CLI can stop a database too. Here is the official example’s answer. Tap the line with its new status.

      Tap the line with its new status.

      0 of 1 found

      You did it!

      You can now run a managed database with backups, a spare and a tight door.

      Go deeper (optional)

      Deleting a database is careful work. RDS offers a final snapshot first, and deletion protection can block mistakes. Snapshots cost storage too, so delete old test ones. For practice, pick the smallest size, one wing, and delete it the same day.