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World D1: First Containers

Docker Hub and trusted images

You will learn: to read a full image name, and to pick packs you can trust.

Checked with Docker Engine 29 on 31 Oct 2026

The problem

You search Docker Hub for a web server. Hundreds of packs appear. Anyone can upload one. Which do you heat for your shop?

Watch

Your laptop~

  • No open hatches

Lunchboxes (containers)

  • No containers yet

Frozen packs (images)

  • No images yet

Docker Hub: The biggest public shop freezer for images (docker.io). Docker uses it by default. is the biggest public shop freezer. Read the last line: docker.io/library/nginx:latest. library is the shelf for official packs.

Try it

Every short name has a full name. Put the parts of docker.io/library/nginx:1.30-alpine in order, left to right.

Leftmost part at the top. Put these in order. Use the arrows, or drag.

  • 1.30-alpine: the label (tag)
  • library: the shelf (official packs)
  • docker.io: the freezer (Docker Hub)
  • nginx: the dish

Try it

Docker Hub marks trusted packs with badges. Sort these.

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

      Predict

      aina/nginx:1.30 and nginx:1.30. Same pack?

      Try it

      Pull the official redis pack, version 8 on Alpine. Watch it land in your freezer.

      Your laptop~

      • No open hatches

      Lunchboxes (containers)

      • No containers yet

      Frozen packs (images)

      • No images yet

      Check

      Your laptop~

      • No open hatches

      Lunchboxes (containers)

      • No containers yet

      Frozen packs (images)

      • No images yet

      The real error starts with pull access denied. Plain words: there is no such pack, or it is private. Check the spelling and the shelf name.

      You did it!

      You can now read image names and pick packs you can trust.

      Go deeper (optional)

      Look for the Docker Official Image: A trusted image Docker curates and keeps updated, like nginx or postgres. No user name in front. and Verified Publisher: A Docker Hub badge for images from companies that Docker has checked. badges. Docker also offers Docker Hardened Images, extra-small safe bases (World D2). Docker Hub limits pulls when you are not logged in. World D5 explains.

      Real rep (optional):

      Real mission

      3. docker pull nginx:1.30-alpine

      0 of 3 steps done · Your ticks are saved.