What happens when 'docker-compose up' is run without the '-d' flag?

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When 'docker-compose up' is executed without the '-d' flag, the containers are run in the foreground. This means that the command will block the terminal session until it is terminated, allowing you to see the logs and output from the containers directly in your terminal. This can be particularly useful for debugging or monitoring applications, as you can observe real-time log data.

In this mode, the terminal will display the standard output and error streams of the containers, allowing you to interact with them while they are running. If you want to run the containers in the background, thereby freeing up the terminal for other commands, you would need to include the '-d' (detached) flag.

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