Problem
How do ECS containers communicate between each others?
Situation
I use docker compose ecs integration.
In AWS docker context, docker compose up did a deploy correctly.
But reverse proxy doesn't work correctly, maybe because of communication with containers.
My docker-compose.yml
version: '3'
services:
nginx:
image: {ACCOUNT}.dkr.ecr.{REGION}.amazonaws.com/{MY_IMAGE}
ports:
- "80:80"
nodeapp:
image: {ACCOUNT}.dkr.ecr.{REGION}.amazonaws.com/{MY_REACT_IMAGE}
working_dir: /src
command: sh -c "yarn install && yarn build && yarn start"
ports:
- "3000:3000"
MY nginx.conf
server {
listen 80;
server_name localhost;
location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
proxy_pass http://localhost:3000/;
# proxy_pass http://nodeapp:3000/; // works only for local
# proxy_pass http://nodeapp.{MY CLUSTER}.local:3000/; // doesn't work
}
}
My understandings
- In the same ECS service, containers can communicate with each other by localhost.
- In the diffrent ECS service, containers can communicate with each other by service discovery.
Are these correct? And, how do I do that?
1: The same ECS service
I tried to do that at first. But, docker compose up(ecs integration) created different services(for nginx service and application(react) service. How do I configure that?
2: The different service
In nginx conf, proxy_pass http:nodeapp.{MY_CLUSTER}.local:3000 doesn't work correctly.
How do ECS containers communicate between each others?
Let me know the simplest way.
Thanks in advance.
