docker exec -it returns "cannot enable tty mode on non tty input"

Running docker exec -i instead of docker exec -it fixed my issue. Indeed, my script was launched by CRONTAB which isn't a terminal.

As a reminder:

Usage: docker exec [OPTIONS] CONTAINER COMMAND [ARG...]

Run a command in a running container

  -i, --interactive=false    Keep STDIN open even if not attached  
  -t, --tty=false            Allocate a pseudo-TTY

If you're getting this error in windows docker client then you may need to use the run command as below

$ winpty docker run -it ubuntu /bin/bash

just use "-i"

docker exec -i [your-ps] [command]

If you're on Windows and using docker-machine and you're using GIT Bash or Cygwin, to "get inside" a running container you'll need to do the following:

docker-machine ssh default to ssh into the virtual machine (Virtualbox most likely)

docker exec -it <container> bash to get into the container.

EDIT:

I've recently discovered that if you use Windows PowerShell you can docker exec directly into the container, with Cygwin or Git Bash you can use winpty docker exec -it <container> bash and skip the docker-machine ssh step above.

docker exec -it returns "cannot enable tty mode on non tty input"

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