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Taking a course that deals with these; the actual specifics is not pertinent to the course, but I generally have interest in trying to understand things regardless.

I have a docker-compose.yml file which I 'call on', or 'spin up'. The file contains the following information:

services: redis: image: redis:latest expose: - "6379" sample0395: image: sample0395/base:latest stdin_open: true tty: true expose: - "8888" ports: - "8888:8888"

From what I understand, and just based on the hierarchy as shown:

  • redis and sample0395 are 'services'
  • redis:latest and sample0395/base:latest are the image_name:tag combinations
  • expose and ports: list the ports (not sure what the difference is or what the significance is of the difference between these two)
  • I have no idea what stdin_open or tty do, and cannot seem to get an understanding through google.
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tty and stdin_open are analogous to the -t and -i arguments for the docker run command, respectively.

You use stdin_open when you need to work on a project outside the Docker container.

You use tty when you need to work on a project inside the Docker container.

To test this out, try running docker-compose up with either tty or stdin_open but not both and you'll find that with stdin_open you don't log in to the container's terminal while the opposite happens with tty.

As for your question regarding the difference between expose and ports, answers are found here.

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This helps. Could you please share examples of working on a project from outside the container vs inside the container?

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