what is docker run -it flag?

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-it is short for --interactive + --tty. When you docker run with this command it takes you straight inside the container.

-d is short for --detach, which means you just run the container and then detach from it. Essentially, you run container in the background.

Edit: So if you run the Docker container with -itd, it runs both the -it options and detaches you from the container. As a result, your container will still be running in the background even without any default app to run.

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