README.md

Compose sample application

Go server with a Nginx proxy and a Postgres database

Project structure:

. ├── backend │   ├── Dockerfile │   ├── go.mod │   ├── go.sum │   └── main.go ├── db │   └── password.txt ├── compose.yaml ├── proxy │   └── nginx.conf └── README.md 

compose.yaml

services: backend: build: context: backend target: builder ... db: image: postgres ... proxy: image: nginx volumes: - type: bind source: ./proxy/nginx.conf target: /etc/nginx/conf.d/default.conf read_only: true ports: - 80:80 ...

The compose file defines an application with three services proxy, backend and db. When deploying the application, docker compose maps port 80 of the proxy service container to port 80 of the host as specified in the file. Make sure port 80 on the host is not already being in use.

Deploy with docker compose

$ docker compose up -d Creating network "nginx-golang-postgres_default" with the default driver Pulling db (postgres:)... latest: Pulling from library/postgres ... Successfully built 5f7c899f9b49 Successfully tagged nginx-golang-postgres_proxy:latest WARNING: Image for service proxy was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`. Creating nginx-golang-postgres_db_1 ... done Creating nginx-golang-postgres_backend_1 ... done Creating nginx-golang-postgres_proxy_1 ... done

Expected result

Listing containers must show three containers running and the port mapping as below:

$ docker compose ps NAME COMMAND SERVICE STATUS PORTS nginx-golang-postgres-backend-1 "/code/bin/backend" backend running nginx-golang-postgres-db-1 "docker-entrypoint.s…" db running (healthy) 5432/tcp nginx-golang-postgres-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 ["Blog post #0","Blog post #1","Blog post #2","Blog post #3","Blog post #4"]

Stop and remove the containers

$ docker compose down