Communicate with a docker container from another docker container - docker

Question

This is my docker-compose file.
version: "3.7"
services:
foo01:
shm_size: "1000000000"
build:
context: ./foo
tty: true
volumes:
- "./foo/src:/tmp/"
foo02:
shm_size: "1000000000"
build:
context: ./foo
tty: true
volumes:
- "./foo/src:/tmp/"
nginx:
build: ./nginx
tty: true
links:
- foo01
- foo02
ports:
- "80:80"
And this is my nginx conf file if it's needed.
events { worker_connections 1024; }
http {
proxy_headers_hash_max_size 1024;
proxy_headers_hash_bucket_size 64;
upstream TestApp {
# References to our app containers, via docker compose
server foo01:5000;
server foo02:5000;
}
server {
listen 80;
server_name domain.com;
location / {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Real-IP $remote_addr;
# proxy_redirect off;
proxy_buffers 8 24k;
proxy_buffer_size 4k;
proxy_pass http://TestApp;
proxy_set_header Host $host;
}
}
}
My question is, once I build and run docker-compose, how do I check if foo01:5000 is reachable from my nginx docker container? Is it possible to communicate from the bash shell of a docker?

Answer 1

You could open the bash of a docker container as fallow
docker exec -it <CONTAINER_ID> bash
And execute a curl command to other container, if you have curl in your container, otherwise you have to install it
curl foo01:5000
But I think the problem is in the docker-compose.yml file, you didn't specified the port 5000 for foo01 and expose it.