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Nginx: (111: Connection refused) while connecting to upstream

Hi Team ,

I have issue with Ngnix configuration in docker container . I am unable to establish the connection from Ngnix to angular application in the same container .

Below is the docker file configuration

FROM node:12.16.3-alpine as builder

RUN mkdir /app

WORKDIR /app

COPY package*.json ./

RUN npm install && npm install node-sass

COPY . .

RUN npm run build:ssr --prod --output-path=dist

EXPOSE 4200

CMD [ “node”, “dist/server.js” ]

FROM nginx:alpine

COPY ./.nginx/nginx.conf /etc/nginx/nginx.conf

RUN rm -rf /usr/share/nginx/html/*

COPY --from=builder /app/dist /usr/share/nginx/html

EXPOSE 80 8080

ENTRYPOINT [“nginx”, “-g”, “daemon off;”]

Ngnix configuration

worker_processes 4;

events { worker_connections 1024; }

http {

server {
listen 0.0.0.0:8080;
listen [::]:8080;
listen 127.0.0.1;
server_name localhost;
default_type application/octet-stream;

gzip                    on;
gzip_comp_level         6;
gzip_vary               on;
gzip_min_length         1000;
gzip_proxied            any;
gzip_types              text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
gzip_buffers            16 8k;
gunzip on;
client_max_body_size    256M;

root /usr/share/nginx/html;
autoindex on;


location / {
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_set_header Host $host;
            proxy_cache_bypass $http_upgrade;
	proxy_pass http://127.0.0.1:4200;
    }

}
}

Below is the error which I am getting in this case

2021/03/14 12:41:24 [error] 8#8: *5 connect() failed (111: Connection refused) while connecting to upstream, client: xxx.xxx.0.1, server: localhost, request: “GET / HTTP/1.1”, upstream: “http://127.0.0.1:4200/”, host: “localhost:8080”

172.17.0.1 - - [14/Mar/2021:12:41:24 +0000] “GET / HTTP/1.1” 502 559 “-” “Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.82 Safari/537.36”

172.17.0.1 - - [14/Mar/2021:12:41:26 +0000] “\x05\x02\x00\x01” 400 157 “-” “-”

It would be of great help if any thing is missing in my configuration . Any help in this aspect would be really helpful and appreciated

Thanks
Uday