I have a Node.js app and an Angular app. I’ve dockerized them. They run in the same container. Nginx serves the Angular app and sends the /api/* requests to the Node.js server.

It works perfectly when I’m running the container on my local machine. But it doesn’t work on Google Cloud Run. More specifically, I get 502 errors when calling the API endpoints.

I can see this in the GCP logs:

connect() failed (111: Connection refused) while connecting to upstream, client: 169.254.1.1, server: , request: “GET /api/ping HTTP/1.1”

My Dockerfile:

FROM node:20

RUN apt-get update && apt-get install -y nginx

WORKDIR /usr/src/app

COPY . .

RUN npm ci --omit=dev

RUN cd my-project && npm i && npm run build && cd ..

RUN rm /etc/nginx/sites-enabled/default
COPY nginx.conf /etc/nginx/nginx.conf
RUN cp -r ./my-project/dist/my-project/browser/* /usr/share/nginx/html/
 
CMD npm run pm2:start:prod && nginx -g 'daemon off;'

And the Nginx config:

user  root;
worker_processes  auto;

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;

    server {
        listen 8080;
        server_name _;

        # Serve static files from the /usr/share/nginx/html directory
        location / {
            root /usr/share/nginx/html;
            try_files $uri $uri/ /index.html;
        }

        # Proxy requests to /api to the backend server
        location /api/ {
            rewrite ^/api/(.*)$ /$1 break;
            proxy_pass http://127.0.0.1:3001;
        }

        access_log /dev/stdout;
        error_log /dev/stderr;
    }
}

Interestingly, it used to work without Nginx and with ng serve that used to proxy requests itself.