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Guillaume Lours
80 lines
2.4 KiB
Markdown
80 lines
2.4 KiB
Markdown
## Compose sample application
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### Java application with Spring framework 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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│ └── ...
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├── db
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│ └── password.txt
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├── compose.yaml
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└── README.md
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```
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[_compose.yaml_](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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ports:
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- 8080:8080
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db:
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image: postgres
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...
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```
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The compose file defines an application with two services `backend` and `db`.
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When deploying the application, docker compose maps port 8080 of the backend service container to port 8080 of the host as specified in the file.
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Make sure port 8080 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 "spring-postgres_default" with the default driver
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Building backend
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Step 1/11 : FROM maven:3.5-jdk-9 AS build
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3.5-jdk-9: Pulling from library/maven
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...
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Successfully tagged spring-postgres_backend:latest
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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`.
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Creating spring-postgres_backend_1 ... done
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Creating spring-postgres_db_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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56236f640eaa postgres "docker-entrypoint.s…" 29 seconds ago Up 28 seconds 5432/tcp spring-postgres_db_1
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6e69472dc2c0 spring-postgres_backend "java -Djava.securit…" 29 seconds ago Up 28 seconds 0.0.0.0:8080->8080/tcp spring-postgres_backend_1
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```
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After the application starts, navigate to `http://localhost:8080` in your web browse or run:
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```
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$ curl localhost:8080
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<!DOCTYPE HTML>
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<html>
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<head>
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<title>Getting Started: Serving Web Content</title>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
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</head>
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<body>
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<p>Hello from Docker!</p>
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</body>
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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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Stopping spring-postgres_db_1 ... done
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Stopping spring-postgres_backend_1 ... done
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Removing spring-postgres_db_1 ... done
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Removing spring-postgres_backend_1 ... done
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Removing network spring-postgres_default
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```
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