Answer
docker exec runs a command inside a running container, such as docker exec -it myapp bash.
Quick Answer
docker exec runs a new command inside an already-running container. Most common use: docker exec -it bash — opens an interactive shell inside a live container for debugging. The container stays running; you're just attaching an extra process to it. Nothing in the container is interrupted.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ