Docker Compose is a tool for defining and running multi-container Docker applications. It uses a YAML file, called docker-compose.yml, to configure the application’s services. With a single command, Docker Compose creates and starts all the services from the configuration.
A Dockerfile is used to build a custom image for a service. It is possible to integrate Dockerfiles into Docker Compose to build custom images for the services defined in the docker-compose.yml file.
Here are the possible options for Dockerfile integration in Docker Compose:
build: Thebuildkey is used to specify the Dockerfile location and build context. It can be used in the service configuration to build a custom image for that service.
Example:
services:
web:
build: .
This will build the web service using the Dockerfile in the current directory.
image: Theimagekey is used to specify the name of the image to be used for a service. If the image does not exist, Docker Compose will try to build it using the Dockerfile in the build context.
Example:
services:
web:
image: myusername/myimage:latest
This will use the myusername/myimage:latest image for the web service. If the image does not exist, Docker Compose will try to build it using the Dockerfile in the build context.
dockerfile: Thedockerfilekey is used to specify the name of the Dockerfile to be used for a service. It can be used in the service configuration to build a custom image for that service.
Example:
services:
web:
build:
context: .
dockerfile: Dockerfile.web
This will build the web service using the Dockerfile.web Dockerfile in the current directory.
dockerfile_inline: Thedockerfile_inlinekey is used to specify the Dockerfile content as an inlined string in the Compose file. It can be used in the service configuration to build a custom image for that service.
Example:
services:
web:
build:
context: .
dockerfile:
<<: *base
FROM python:3.8-slim
RUN pip install --no-cache-dir -r requirements.txt
