Lab #3: Config Command
docker-compose config command validate the docker-compose file and view the compose file.
|Platform||Number of Instance||Reading Time|
|Play with Docker||1||5 min|
- Create an account with DockerHub
- Open PWD Platform on your browser
- Click on Add New Instance on the left side of the screen to bring up Alpine OS instance on the right side
- Create a docker-compose.yml file
- Validate the docker-compose file
- Testing docker-compose config with wrong config
Create a docker-compose.yml file
Copy the below contents:
version: '3.1' services: #Nginx Service webserver: image: nginx:alpine container_name: webserver restart: unless-stopped ports: - "80:80" - "443:443"
Or Clone the repository:
git clone https://github.com/collabnix/dockerlabs cd intermediate/workshop/compose/lab/3/config/ cat docker-compose.yml
Validate the docker-compose file
$ docker-compose config services: webserver: container_name: webserver image: nginx:alpine ports: - 80:80/tcp - 443:443/tcp restart: unless-stopped version: '3.1'
Testing docker-compose config with wrong config
Lets just change the instruction
service and test.
$docker-compose config ERROR: The Compose file './docker-compose.yml' is invalid because: Invalid top-level property "service". Valid top-level sections for this Compose file are: services, secrets, version, networks, volumes, and extensions starting with "x-". You might be seeing this error because you're using the wrong Compose file version. Either specify a supported version (e.g "2.2" or "3.3") and place your service definitions under the `services` key, or omit the `version` key and place your service definitions at the root of the file to use version 1. For more on the Compose file format versions, see https://docs.docker.com/compose/compose-file/
Next » Lab #4: Build Command