Using another image with the use of a docker-compose

Question

I had a question regarding docker-compose files and having an image use another image through a requests.post call? I am having trouble either connecting the two images together and/or accessing the images.

Here is what my docker-compose.yml looks like:

version: "3.7"
services:
    cerberus:
        image: "ctpelok77/ibmresearchaiplanningsolver"
        ports:
            - "4501:4501"
    my-external-planner:
        build: .
        ports:
            - "8000:8000"

I then use the following commands:

docker-compose up -d
docker run -it external-planner_my-external-planner

Inside the my-external-command , I use the following line response = requests.post('http://cerberus:4501/planners/satisficing/seq-sat-cerberus', headers=headers, data=body_str) ; however, this gives me a

requests.exceptions.ConnectionError: HTTPConnectionPool(host='cerberus', port=4501): Max retries exceeded with 
url: /planners/satisficing/seq-sat-cerberus (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f90eeb04510>: Failed to establish a new connection: [Errno -2] Name or service not known',)) 

I was wondering if I am not correctly connecting my images in the docker-compose or if I am incorrectly trying to access the images in my image?

Answer 1

I was able to amend this issue by giving the services specific names and assigning them a shared network in the docker-compose.yml file:

version: "3.7"
services:
    my-ibm-planner:
        image: "ctpelok77/ibmresearchaiplanningsolver"
        ports:
            - "4501:4501"
        container_name: "ibm-container"
        networks:
            - network-planner
        tty: true
    my-external-planner:
        image: "docker.sift.net/tbessho/external-planner"
        ports:
            - "8000:8000"
        networks:
            - network-planner
        container_name: "ext-plan"
        tty: true
networks:
    network-planner:
        name: network-planner

along with changing the python script to use the following line:

response = requests.post('http://ibm-container:4501/planners/satisficing/seq-sat-cerberus')