nginx reverse proxy to other nginx 502 bad gateway

I would like to create two services, both of them having their own nginx. I would like to use third nginx as a reverse proxy to these two but I got

502 Bad Gateway

when I request

http://127.0.0.1:8080/  http://127.0.0.1:8080/one  http://127.0.0.1:8080/two  

accessing:

http://127.0.0.1:8081  http://127.0.0.1:8082  

works ok

I have this docker-compose.yml

version: "3.3"  services:    nginx-one:      image: nginx:1.17.8      ports:        - "8081:80"      networks:         - frontend        - backend      volumes:         - ./nginx-one/html:/usr/share/nginx/html    nginx-two:      image: nginx:1.17.8      ports:        - "8082:80"      networks:         - frontend        - backend      volumes:         - ./nginx-two/html:/usr/share/nginx/html    nginx-reverse-proxy:      image: nginx:1.17.8      ports:        - "8080:80"      networks:         - frontend        - backend      volumes:         - ./nginx-reverse-proxy/html:/usr/share/nginx/html        - ./conf.d:/etc/nginx/conf.d  networks:    frontend:      internal: false    backend:      internal: true  

and dir structure

.  ├── docker-compose.yml  ├── nginx-one  │   └── html  │       └── index.html  ├── nginx-reverse-proxy  │   ├── conf.d  │   │   └── default.conf  │   └── html  │       └── index.html  ├── nginx-two      └── html          └── index.html  

nginx.conf content

user  nginx;  worker_processes  1;    error_log  /var/log/nginx/error.log warn;  pid        /var/run/nginx.pid;      events {      worker_connections  1024;  }      http {      include       /etc/nginx/mime.types;      default_type  application/octet-stream;        log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '                        '$status $body_bytes_sent "$http_referer" '                        '"$http_user_agent" "$http_x_forwarded_for"';        access_log  /var/log/nginx/access.log  main;        sendfile        on;      #tcp_nopush     on;        keepalive_timeout  65;        #gzip  on;        include /etc/nginx/conf.d/*.conf;  }  

and

conf.d/default.conf

server {        listen 80;        location /one {          proxy_pass http://127.0.0.1:8081/;      }        location /two {          proxy_pass http://127.0.0.1:8082/;      }  }  

When I comment this line of docker-compose.yml

# ./nginx-reverse-proxy/conf.d:/etc/nginx/conf.d  

so conf.d/default.conf is not used, requesting:

http://127.0.0.1:8080/  

gives a proper response from the nginx-reverse-proxy itself but obviously

http://127.0.0.1:8080/one  http://127.0.0.1:8080/two  

don't provide any response from

http://127.0.0.1:8081  http://127.0.0.1:8082  

but 404 instead.

https://stackoverflow.com/questions/65907904/nginx-reverse-proxy-to-other-nginx-502-bad-gateway January 27, 2021 at 03:23AM