compose-dev-env
Example used to try a Compose application with Docker Dev Environments.
This example is based on the nginx-golang-mysql sample of awesome-compose repository.
Compose sample application
Go server with an Nginx proxy and a MariaDB database
Project structure:
.
├── backend
│ ├── Dockerfile
│ ├── go.mod
│ └── main.go
├── db
│ └── password.txt
├── docker-compose.yaml
├── proxy
│ ├── conf
│ └── Dockerfile
└── README.md
services:
backend:
build: backend
...
db:
image: mariadb
...
proxy:
build: proxy
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 "compose-dev-env_default" with the default driver
Creating volume "compose-dev-env_db-data" with default driver
Building backend
Step 1/8 : FROM golang:1.13-alpine AS build
1.13-alpine: Pulling from library/golang
...
Successfully built 5f7c899f9b49
Creating compose-dev-env_db_1 ... done
Creating compose-dev-env_backend_1 ... done
Creating compose-dev-env_proxy_1 ... done
Expected result
Listing containers must show three containers running and the port mapping as below:
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
d6752b317e6d compose-dev-env_proxy "nginx -g 'daemon of…" About a minute ago Up About a minute 0.0.0.0:80->80/tcp, :::80->80/tcp compose-dev-env_proxy_1
70bf9182ea52 compose-dev-env_backend "/server" About a minute ago Up About a minute 8000/tcp compose-dev-env_backend_1
c67de604799d mariadb "docker-entrypoint.s…" About a minute ago Up About a minute 3306/tcp compose-dev-env_db_1
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
