Nginx get error when using in a docker-compose file - docker

Question

I use a docker-compose file with 3 service (node-red, mosquitto and mongo) and and I want use nginx as load balancer of node-red service:
version: '2.2'
networks:
Platform-Network:
name: IoT-Network
volumes:
Platform:
MQTT-broker:
DataBase:
Nginx:
services:
Platform:
image: custom-node-red:latest
networks:
- Platform-Network
restart: always
volumes:
- ./node-red:/data
# depends_on:
# - Nginx
MQTT-broker:
container_name: mosquitto
image: eclipse-mosquitto
ports:
- "192.168.100.101:1883:1883"
networks:
- Platform-Network
restart: always
depends_on:
- Platform
volumes:
- ./mosquitto/config:/mosquitto/config
- ./mosquitto/data:/mosquitto/data
- ./mosquitto/log:/mosquitto/log
DataBase:
container_name: mongodb
image: mongo
ports:
- "8083:27017"
networks:
- Platform-Network
restart: always
depends_on:
- Platform
volumes:
- ./mongodb/data:/data/db
- ./mongodb/backup:/data/backup
- ./mongodb/mongod.conf:/etc/mongod.conf
- ./mongodb/log:/var/log/mongodb/
Nginx:
container_name: nginx
image: nginx
ports:
- "4000:4000"
depends_on:
- Platform
volumes:
- ./nginx/nginx.conf:/etc/nginx/nginx.conf
restart: always
Nginx config file is:
user nginx;
events {
worker_connections 1000;
}
http {
upstream platform {
server platform_1:1880;
server platform_2:1880;
server platform_3:1880;
}
server {
listen [::]:4000;
listen 4000;
location / {
proxy_pass http://platform;
}
}
}
I run my service with docker-compose -f platform.yaml up -d --scale Platform=3 and containers up as show in
this
.But as showen in above image, nginx dosnt up.
Nginx container log get this error and i can't resolve it.

Answer 1

Your nginx service also need to join the same network as Platform:
Nginx:
container_name: nginx
image: nginx
ports:
- "4000:4000"
depends_on:
- Platform
volumes:
- ./nginx/nginx.conf:/etc/nginx/nginx.conf
restart: always
networks: # add this
- Platform-Network