76 lines
2.4 KiB
Markdown
76 lines
2.4 KiB
Markdown
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## Compose sample application
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### Go server with an Nginx proxy and a Postgres database
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Project structure:
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```
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.
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├── backend
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│ ├── Dockerfile
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│ ├── go.mod
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│ └── main.go
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├── db
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│ └── password.txt
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├── docker-compose.yaml
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├── proxy
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│ ├── conf
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│ └── Dockerfile
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└── README.md
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```
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[_docker-compose.yaml_](docker-compose.yaml)
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```
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services:
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backend:
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build: backend
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...
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db:
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image: postgres
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...
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proxy:
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build: proxy
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ports:
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- 80:80
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...
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```
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The compose file defines an application with three services `proxy`, `backend` and `db`.
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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.
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Make sure port 80 on the host is not already being in use.
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## Deploy with docker-compose
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```
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$ docker-compose up -d
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Creating network "nginx-golang-postgres_default" with the default driver
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Pulling db (postgres:)...
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latest: Pulling from library/postgres
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...
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Successfully built 5f7c899f9b49
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Successfully tagged nginx-golang-postgres_proxy:latest
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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`.
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Creating nginx-golang-postgres_db_1 ... done
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Creating nginx-golang-postgres_backend_1 ... done
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Creating nginx-golang-postgres_proxy_1 ... done
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```
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## Expected result
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Listing containers must show two containers running and the port mapping as below:
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```
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$ docker ps
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CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
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5e3ecd0289c0 nginx-golang-postgres_proxy "nginx -g 'daemon of…" 48 seconds ago Up 48 seconds 0.0.0.0:80->80/tcp nginx-golang-postgres_proxy_1
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ffa1410b1c8a nginx-golang-postgres_backend "/server" 49 seconds ago Up 48 seconds 8000/tcp nginx-golang-postgres_backend_1
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e63be7db7cbc postgres "docker-entrypoint.s…" 49 seconds ago Up 49 seconds 5432/tcp nginx-golang-postgres_db_1
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```
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After the application starts, navigate to `http://localhost:80` in your web browser or run:
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```
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$ curl localhost:80
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["Blog post #0","Blog post #1","Blog post #2","Blog post #3","Blog post #4"]
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```
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Stop and remove the containers
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```
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$ docker-compose down
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```
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