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In the Best practices for writing Dockerfiles guide of the docker documentation, we can read:

Avoid installing or using sudo since it has unpredictable TTY and signal-forwarding behavior that can cause problems. If you absolutely need functionality similar to sudo, such as initializing the daemon as root but running it as non-root), consider using “gosu”.

My questions are:

  • What exactly in the sudo behavior is unpredictable?
  • Which problems can it cause?
  • Is it a feature or a bug of sudo?

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