awesome-compose

History

Guillaume Lours f4f078cd40 Improve Dockerfile Signed-off-by: Guillaume Lours <guillaume.lours@docker.com>		2020-03-12 14:29:50 +01:00
..
backend	Improve Dockerfile	2020-03-12 14:29:50 +01:00
db	add spring-postgres application sample	2020-03-05 19:23:28 +01:00
docker-compose.yaml	Add connection between spring boot server and postgresql database	2020-03-12 14:16:55 +01:00
README.md	update readme.md for all samples	2020-03-06 20:44:32 +01:00

README.md

Compose sample application

Java application with Spring framework and a Postgres database

Project structure:

.
├── backend
│   ├── Dockerfile
│   └── ...
├── db
│   └── password.txt
├── docker-compose.yaml
└── README.md

docker-compose.yaml

version: "3.7"
services:
  backend:
    build: backend
    ports:
    - 80:8080
  db:
    image: postgres
    ...

The compose file defines an application with two services backend and db. When deploying the application, docker-compose maps port 8080 of the backend 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 "spring-postgres_default" with the default driver
Building backend
Step 1/11 : FROM maven:3.5-jdk-9 AS build
3.5-jdk-9: Pulling from library/maven
...
Successfully tagged spring-postgres_backend:latest
WARNING: Image for service backend was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Creating spring-postgres_backend_1 ... done
Creating spring-postgres_db_1      ... done

Expected result

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

$ docker ps
CONTAINER ID        IMAGE                     COMMAND                  CREATED             STATUS              PORTS                  NAMES
56236f640eaa        postgres                  "docker-entrypoint.s…"   29 seconds ago      Up 28 seconds       5432/tcp               spring-postgres_db_1
6e69472dc2c0        spring-postgres_backend   "java -Djava.securit…"   29 seconds ago      Up 28 seconds       0.0.0.0:80->8080/tcp   spring-postgres_backend_1

After the application starts, navigate to http://localhost:80 in your web browse or run:

$ curl localhost:80
<!DOCTYPE HTML>
<html>
<head>
  <title>Getting Started: Serving Web Content</title>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
	<p>Hello from Docker!</p>
</body>

Stop and remove the containers

$ docker-compose down
Stopping spring-postgres_db_1      ... done
Stopping spring-postgres_backend_1 ... done
Removing spring-postgres_db_1      ... done
Removing spring-postgres_backend_1 ... done
Removing network spring-postgres_default