Nginx on Docker (Connection Refused while connecting to upstream)-CodePudding

I keep getting this error when I try to connect to my reverse proxy:

2022/09/20 01:06:43 [error] 25#25: *5 connect() failed (111: Connection refused) while connecting to upstream, client: x.x.x.x, server: localhost, request: "GET /sdr_user HTTP/1.1", upstream: "http://127.0.0.1:59524/values", host: "localhost:9191"

2022/09/20 01:06:43 [warn] 25#25: *5 upstream server temporarily disabled while connecting to upstream, client: x.x.x.x, server: localhost, request: "GET /sdr_user HTTP/1.1", upstream: "http://127.0.0.1:59524/values", host: "localhost:9191"

2022/09/20 01:06:43 [error] 25#25: *5 connect() failed (111: Connection refused) while connecting to upstream, client: x.x.x.x, server: localhost, request: "GET /sdr_user HTTP/1.1", upstream: "http://127.0.0.1:59524/values", host: "localhost:9191"

2022/09/20 01:06:43 [warn] 25#25: *5 upstream server temporarily disabled while connecting to upstream, client: x.x.x.x, server: localhost, request: "GET /sdr_user HTTP/1.1", upstream: "http://127.0.0.1:59524/values", host: "localhost:9191"

I have tried searching and it said to define my upstream server which i already have in my default.conf file like this:

upstream api_server {
    server localhost:59524;
}

server {
    listen 80;

    server_name localhost;

    location /sdr_user{
        proxy_pass http://api_server/values;
    }
}

My reverse proxy is located in another container separate from my other projects. However, when I directly access localhost:59524, i can access the link without any issues.

Am I missing another configuration?

CodePudding user response：

localhost has no meaning when you work with containers.

If you have a docker-compose.yml with 2 services: nginx and the application, then your nginx sees the application by the name of the service defined in docker-compose.yml

Example:

docker-compose.yml

version: '3'

services:
  svc1:
    image: nginx
    ports:
    - "8080:80"
    volumes:
    - "./default.conf:/etc/nginx/conf.d/default.conf:ro"

  svc2:
    image: <some app>

(no need to expose ports for svc2)

Your default.conf should look like:

upstream api_server {
    server svc2:59524;
}

server {
    listen 80;

    server_name localhost;

    location /sdr_user{
        proxy_pass http://api_server/values;
    }
}

(assuming your app is running on port 59524 inside the container)