How to connect dockerized spring boot app to dockerized postgres

Question

I have to write 3 simple microservices, using spring boot, and dockerize them. Since I have just started reading about dockers I have encountered several issues.

To build docker images I am using this maven plugin:

<plugin>
    <groupId>com.spotify</groupId>
    <artifactId>docker-maven-plugin</artifactId>
    <version>1.2.0</version>
    <configuration>
        <imageName>example</imageName>
        <baseImage>java</baseImage>
        <entryPoint>["java", "-jar", "/${project.build.finalName}.jar"]</entryPoint>
        <resources>
            <resource>
                <targetPath>/</targetPath>
                <directory>${project.build.directory}</directory>
                <include>${project.build.finalName}.jar</include>
            </resource>
        </resources>
        <imageTags>
            <imageTag>latest</imageTag>
        </imageTags>
    </configuration>
</plugin>

Requirements

Docker containers have to run without ROOT user privilages.
Building maven script should build docker containers.
Database also needs to be dockerized (all microservices use one database)

My issues

I have test service .jar and everything works just fine (it connects to dockerized postgres) but when I run docker image (built with sudo mvn docker:build) of test service .jar I can't connect to postgres.

I have found that localhost in data source might be the issue:

spring.datasource.url=jdbc:postgresql://localhost:5432/dockertest

But I don't know what should I put in place of localhost.

I would appreciate any tips on how to easily create and run those docker images (meeting above requirements)

zlaval · Accepted Answer · 2019-06-24 23:35:01Z

Docker wont see your localhost. You have to create a network, and join with all the services (see docker network cli command) Then use the app's docker name to refere it in the network (if name is abc-service then use spring.datasource.url=jdbc:postgresql://abc-service/dockertest).

Or you can use docker compose, which will auto create the network for your services.

example docker-compose.yml:

version: '3' services: redis-server: image: 'redis' eureka-server: build: ./eureka-server ports: - "8010:8010" book-service: build: ./book-service build: ./writer-service

then connect like this in proper services' application.yml:

redis: host: redis-server port: 6379

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