![]() ![]() Then we can build our images, create the defined containers, and start it in one command: If the option external is set to true, it will use an existing one with the given name.īefore we continue, we'll check our build-file for syntax-errors: $> docker-compose config In this example, we let docker-compose create a named network of type ‘bridge' for us. networks: In this section, we're specifying the networks available to our services.A given name-value must be listed in the networks section. networks: This is the identifier of the named networks to use.Otherwise, it's searching for this image in the library or remote-registry. image: Tells Docker which name it should give to the image when build-features are used.dockerfile: If given, it sets an alternate name for a Dockerfile.context: If given, it specifies the build-directory, where the Dockerfile is looked-up.build: If given, docker-compose is able to build an image from a Dockerfile.services: Each object in this key defines a service, a.k.a container.Here we use the newer version, whereas the legacy format is ‘1'. version: Specifies which format version should be used. ![]() We can combine the configuration for both services in one file called docker-compose.yml: version: '2' To create an image from our Dockerfile, we have to run ‘docker build' like before: We must define them as JSON-Array because we'll use an ENTRYPOINT in combination with a CMD for some application arguments. ENTRYPOINT: This will be the executable to start when the container is booting.COPY: We let Docker copy our jar file into the image.MAINTAINER: The maintainer of the image.FROM: As the base for our image, we'll take the Java-enabled Alpine Linux created in the previous section.This file contains the following information: To dockerize the application, we first create a file named Dockerfile with the following content: FROM openjdk:8-jdk-alpineĬOPY target/docker-message-server-1.0.0.jar message-server-1.0.0.jarĮNTRYPOINT Now we have a working Spring Boot application that we can access at localhost:8888/messages. Next, we'll start up the Spring Boot application: $> java -jar target/docker-message-server-1.0.0.jar
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