World D4: Set Meals

Optional extras: profiles

You will learn: to keep extra dishes off until you ask for them.

Checked with Docker Engine 29 on 31 Oct 2026

The problem

~/kedai-kancil $ docker compose up -d[+] up 5/5 ✔ Network kedai-kancil_default Created                                     0.1s ✔ Volume kedai-kancil_db-data  Created                                     0.0s ✔ Container kedai-kancil-web-1 Started                                     0.3s ✔ Container kedai-kancil-api-1 Started                                     0.3s ✔ Container kedai-kancil-db-1  Started                                     0.3s~/kedai-kancil $ docker compose psNAME                 IMAGE                COMMAND                  SERVICE   CREATED         STATUS         PORTSkedai-kancil-api-1   kedai-kancil-api     "docker-entrypoint.s…"   api       3 seconds ago   Up 3 seconds   3000/tcpkedai-kancil-db-1    postgres:18-alpine   "docker-entrypoint.s…"   db        3 seconds ago   Up 3 seconds   5432/tcpkedai-kancil-web-1   kedai-kancil-web     "/docker-entrypoint.…"   web       3 seconds ago   Up 3 seconds   0.0.0.0:8080->80/tcp

Your laptop`~/kedai-kancil`

No open hatches

Lunchboxes (containers)

No containers yet

Frozen packs (images)

kedai-kancil-api:latest6 layers · 244MB
kedai-kancil-web:latest9 layers · 92.6MB
nginx:1.30-alpine8 layers · 93.5MB
node:24-alpine4 layers · 244MB
postgres:18-alpine9 layers · 433MB
redis:8-alpine7 layers · 162MB

The cache is right there in compose.yaml. You ran docker compose up -d. So why is it not running?

Watch

  cache:
    image: redis:8-alpine
    profiles: [cache]

A side dish comes only when you ask for it. That is a . A dish with a profile stays off. You turn it on when you need it. Sort the dishes.

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

Try it

Order the side dish too. Turn on the cache profile.

Your laptop`~/kedai-kancil`

Laptop port 8080 → kedai-kancil-web-1 port 80

Lunchboxes (containers)

kedai-kancil-api-1running
from kedai-kancil-api kedai-kancil_default
kedai-kancil-db-1running
from postgres:18-alpine kedai-kancil_default kedai-kancil_db-data → /var/lib/postgresql
kedai-kancil-web-1running
from kedai-kancil-web 8080→80 kedai-kancil_default

Frozen packs (images)

kedai-kancil-api:latest6 layers · 244MB · in use
kedai-kancil-web:latest9 layers · 92.6MB · in use
nginx:1.30-alpine8 layers · 93.5MB
node:24-alpine4 layers · 244MB
postgres:18-alpine9 layers · 433MB · in use
redis:8-alpine7 layers · 162MB

Lockers (volumes)

kedai-kancil_db-data24 files · used by kedai-kancil-db-1

Phone lines (networks)

kedai-kancil_defaultkedai-kancil-api-1 ↔ kedai-kancil-db-1 ↔ kedai-kancil-web-1

Hint

docker compose --profile cache up -d

Predict

No --profile at all. You type docker compose up -d cache. What happens?

Check

~/kedai-kancil $ docker compose --profile cache up -d[+] up 6/6 ✔ Network kedai-kancil_default   Created                                   0.1s ✔ Volume kedai-kancil_db-data    Created                                   0.0s ✔ Container kedai-kancil-web-1   Started                                   0.3s ✔ Container kedai-kancil-api-1   Started                                   0.3s ✔ Container kedai-kancil-db-1    Started                                   0.3s ✔ Container kedai-kancil-cache-1 Started                                   0.3s~/kedai-kancil $ docker compose down[+] down 3/4 ✔ Container kedai-kancil-db-1  Removed                                     0.2s ✔ Container kedai-kancil-api-1 Removed                                    10.2s ✔ Container kedai-kancil-web-1 Removed                                     0.2s ! Network kedai-kancil_default Resource is still in use                    0.0s~/kedai-kancil $ docker compose psNAME                   IMAGE            COMMAND                  SERVICE   CREATED          STATUS          PORTSkedai-kancil-cache-1   redis:8-alpine   "docker-entrypoint.s…"   cache     16 seconds ago   Up 16 seconds   6379/tcp

Your laptop`~/kedai-kancil`

No open hatches

Lunchboxes (containers)

No containers yet

Frozen packs (images)

kedai-kancil-api:latest6 layers · 244MB
kedai-kancil-web:latest9 layers · 92.6MB
nginx:1.30-alpine8 layers · 93.5MB
node:24-alpine4 layers · 244MB
postgres:18-alpine9 layers · 433MB
redis:8-alpine7 layers · 162MB

Careful at closing time. Plain down only clears dishes without a profile. Add --profile cache to clear the side dish too.

You did it!

You can now keep extra dishes off until you ask for them.

Go deeper (optional)

COMPOSE_PROFILES=cache docker compose up -d does the same as the flag. Turn on two with --profile cache --profile debug. Good side dishes: debug tools, an admin page, a job that loads test data. Profile names use letters, digits, _, . and -.

Real mission

Add profiles: [cache] to an extra service in your compose.yaml.
See which services would start.
docker compose config --services
List them again with the profile on.
docker compose --profile cache config --services

0 of 3 steps done · Your ticks are saved.

Optional extras: profiles

Your laptop~/kedai-kancil

Lunchboxes (containers)

Frozen packs (images)

Your laptop~/kedai-kancil

Lunchboxes (containers)

Frozen packs (images)

Lockers (volumes)

Phone lines (networks)

Your laptop~/kedai-kancil

Lunchboxes (containers)

Frozen packs (images)

Your laptop`~/kedai-kancil`

Your laptop`~/kedai-kancil`

Your laptop`~/kedai-kancil`