I had the similar kind of issue and the solution was to use thedocker service name
in upstream.
Here is my setup
Flow
Browser ->> Nginx-proxy ->> React-frontend (Nginx) ->> Go-backend
http {
upstream allbackend {
server exam105_frontend:8080; #FrontEnd Service Name
}
server {
listen 80;
location / {
proxy_pass http://allbackend;
}
}
}
Remember to open port 80 publicly and 8080 (or whatever port number you are using) for internal communication in Security Group of your AWS setup, otherwise you won't be able to access the service.
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