Keep a docker container running forever

entrypoint.sh

# Can be used as 'docker run --name=name container --entrypoint /entrypoint.sh'
while :;           # Run an endless loop,
do :;              # of do nothing,
done &             # as background task.
kill -STOP $!      # Stop the background task.
wait $!            # Wait forever, because background task process has been stopped.



# Alternative is using the tail command.
# tail -f /dev/null

See @Stackoverflow1 or Stackoverflow2