What exactly in the sudo behavior is unpredictable?

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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?



sudo tty docker signals




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    Maybe this is one of reason ruderich.org/simon/notes/su-sudo-from-root-tty-hijacking
    – cuonglm
    Apr 11 at 10:40














up vote
3
down vote

favorite
1












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?



sudo tty docker signals




share|improve this question


















  • 1




    Maybe this is one of reason ruderich.org/simon/notes/su-sudo-from-root-tty-hijacking
    – cuonglm
    Apr 11 at 10:40












up vote
3
down vote

favorite
1









up vote
3
down vote

favorite
1






1





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?



sudo tty docker signals




share|improve this question














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?




sudo tty docker signals





share|improve this question













share|improve this question




share|improve this question








edited Apr 11 at 10:12

























asked Apr 11 at 8:35









Ortomala Lokni

2,07511240




2,07511240







  • 1




    Maybe this is one of reason ruderich.org/simon/notes/su-sudo-from-root-tty-hijacking
    – cuonglm
    Apr 11 at 10:40












  • 1




    Maybe this is one of reason ruderich.org/simon/notes/su-sudo-from-root-tty-hijacking
    – cuonglm
    Apr 11 at 10:40







1




1




Maybe this is one of reason ruderich.org/simon/notes/su-sudo-from-root-tty-hijacking
– cuonglm
Apr 11 at 10:40




Maybe this is one of reason ruderich.org/simon/notes/su-sudo-from-root-tty-hijacking
– cuonglm
Apr 11 at 10:40















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