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I am trying to create a Docker container with screen session running some script. Dockerfile contains

CMD screen -S session1 ./testLinux

When I run it in detached mode it closes immediately, saying 

Must be connected to a terminal.

How do I run persistent screen session inside detached docker container?

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1 Answer 1

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I can reproduce this with this Dockerfile:

FROM centos:latest
RUN yum -y install screen && rm -rf /var/cache/yum
CMD screen -S session1 sleep 99999

when I run it with docker run <imageID> I get Must be connected to a terminal.

Screen needs a terminal (tty) to function. The solution is to add -tid to the run flags, from the help:

 -d, --detach                         Run container in background and print container ID
 -i, --interactive                    Keep STDIN open even if not attached
 -t, --tty                            Allocate a pseudo-TTY

See https://docs.docker.com/engine/reference/run/ for reference.

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  • 1
    This is not a solution, I am trying to run it in detached session. Commented Jul 16, 2019 at 6:56
  • Then use -d, added in answer. Commented Jul 16, 2019 at 6:58

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