You can open this sample in the Dev Environments feature of Docker Desktop version 4.12 or later.
Open in Docker Dev Environments 
Project structure:
.
├── backend
│ ├── Dockerfile
│ └── main.go
├── compose.yaml
├── proxy
│ └── nginx.conf
└── README.md
services:
proxy:
image: nginx
volumes:
- type: bind
source: ./proxy/nginx.conf
target: /etc/nginx/conf.d/default.conf
read_only: true
ports:
- 80:80
depends_on:
- backend
backend:
build:
context: backend
target: builder
The compose file defines an application with two services proxy and backend.
When deploying the application, docker compose maps port 80 of the frontend service container to the same port of the host as specified in the file.
Make sure port 80 on the host is not already in use.
$ docker compose up -d
Creating network "nginx-golang_default" with the default driver
Building backend
Step 1/7 : FROM golang:1.13 AS build
1.13: Pulling from library/golang
...
Successfully built 4b24f27138cc
Successfully tagged nginx-golang_proxy:latest
Creating nginx-golang_backend_1 ... done
Creating nginx-golang_proxy_1 ... done
Listing containers must show two containers running and the port mapping as below:
$ docker compose ps
NAME COMMAND SERVICE STATUS PORTS
nginx-golang-backend-1 "/code/bin/backend" backend running
nginx-golang-proxy-1 "/docker-entrypoint.…" proxy running 0.0.0.0:80->80/tcp
After the application starts, navigate to http://localhost:80 in your web browser or run:
$ curl localhost:80
## .
## ## ## ==
## ## ## ## ## ===
/"""""""""""""""""\___/ ===
{ / ===-
\______ O __/
\ \ __/
\____\_______/
Hello from Docker!
Stop and remove the containers
$ docker compose down