Compose workshop
Edit the model and run focused checks. Nothing is executed on your Docker host.20 lines2 services
← Learn Docker 1 · Build your first Docker web server
Level 2 · Interactive workspace
OnePilots Playground
Write a Compose model, inspect the infrastructure it creates and learn to diagnose the failures that happen after docker compose up.
Learning progress0/6
- Compose validated
- Security reviewed
- Logs analyzed
- 0/3 Exercises solved
Compose validator
Run validation to inspect the Compose structure.
Live infrastructure
live modelBROWSERlocalhost
8080
Docker host8080
project network
SERVICEwebnginx:alpine:80
SERVICEapinode:22-alpineinternal only
STORAGEread-only mount
Security scan
Run the scan to review exposure, privileges and resilience.Log analyzer
Paste container logs. Analysis happens locally in the browser.No log analysis yet.
Troubleshooting drills
Learn to recognize the first useful failure signal.
Exercise 01
The API cannot reach the database
The API logs ECONNREFUSED 127.0.0.1:5432 while a db service is running.
api | connect ECONNREFUSED 127.0.0.1:5432Exercise 02
The host port is already in use
Compose stops before the web service starts.
Bind for 0.0.0.0:8080 failed: port is already allocatedExercise 03
The container writes to a read-only mount
nginx starts, but generated content cannot be saved.
open() /usr/share/nginx/html/index.html failed (30: Read-only file system)Safe deployment handoff
Safe deployment handoff
The Playground teaches and checks configuration, but deliberately has no Docker socket. Validate again on the target host before starting services.
- 01
docker compose config - 02
docker compose up -d - 03
docker compose ps - 04
docker compose logs --tail=100