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Do I absolutely need to have a Dockerfile in my directory when using the command docker-compose up? I don't believe a Dockerfile is necessary but want to be sure.
If I only have a docker-compose.yml file using pre-built images, there would be no need for a Dockerfile.
Correct me please! Thanks in advance.
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Both the Dockerfile and docker-compose are important resources in the development and deployment of cloud-native applications. But knowing the difference between docker-compose and the Dockerfile is important. The Dockerfile is used to build images, while docker-compose helps you run them as containers.
Dockerfile: A Dockerfile is a text document that contains all of the commands / build instructions, a user could call on the command line to assemble an image. This will be saved as a Dockerfile . (Note the lowercase 'f'.) Docker-Compose: Compose is a tool for defining and running multi-container Docker applications.
Docker-compose command doesn't override Dockerfile CMD.
The docker compose up command aggregates the output of each container (like docker compose logs --follow does). When the command exits, all containers are stopped. Running docker compose up --detach starts the containers in the background and leaves them running.
docker-compose lets you choose between the 2 options
build the container from a specified image:
services:
example:
image: your/imagename
build the container out of a Dockerfile:
services:
example:
build:
context: path/to/Dockerfile/dir
dockerfile: Dockerfile #here you specify the name of your Dockerfile file
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