Docker 'run' command to start an interactive BaSH session

Docker

# Assuming an Ubuntu Docker image
$ docker run -it <image> /bin/bash

# without the /bin/ part
docker run -it ubuntu bash
# nothing else but bash...
docker run -it bash

#if image has a defined ENTRYPOINT. For these cases use:
docker run -it --entrypoint /bin/bash <image>

# save it as a new image like this:
$ docker commit <container_id> new_image_name:tag_name(optional)

# for the images w/o bash.
docker run -it --entrypoint /bin/sh 

# If you want to interact with an existing container
docker exec -it <name> bash

# (alpine has sh)
docker exec -it <name> sh

# also, try entrypoint
...
"Cmd": [
  "src/service.py"
],
"Entrypoint": [
  "python"
],
...