Answer
up uses existing images. up --build forces image rebuild before starting services.
Quick Answer
docker compose up starts existing containers (or creates them if they don't exist) using the current images. docker compose up --build forces Docker to rebuild images before starting — picks up Dockerfile changes. Without --build, code changes in your Dockerfile won't be reflected in running containers.
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SugharaIQ Editorial Team
Verified Answer
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Source: SugharaIQ