![]() ![]() Successfully tagged spring-boot-app:latest Removing intermediate container 04bf7e97079a Step 2/3 : COPY target/spring-boot-app-0.0.1-SNAPSHOT.war /app.war Status: Downloaded newer image for openjdk:8-jre-alpine Then, build the image: $ docker build -t spring-boot-app:latest. Make sure your pom.xml has this block in the plugins section: This copies the jar into the docker directory as part of the package build target. Next, add the output directory property to the spring-boot-maven-plugin. You can’t use relative paths in Dockerfiles, so you’ll need to modify our pom.xml to place the war file in the target directory. Place this file in a new folder at the top of your project named docker. It’s a best practice to build images in a “clean” directory, as docker build’s default behavior is to copy the working directory to the image. We’ll take a closer look at these commands below. You create images with a Dockerfile, which lists the components and commands that make up the package.įirst, create the file : # Alpine Linux with OpenJDK JREĬOPY spring-boot-app-0.0.1-SNAPSHOT.war /app.warĬMD ĭockerfiles are a list of commands that docker performs to build an image. Build and run a Docker application Building an Image Let’s get right to work running this in docker. It serves a single page at /springbootapp/employees: You can run the application with this command line: java =default -jar target/spring-boot-ops.war It’s a small web application that manages employee records. To keep the tutorial focused on Docker, we’ll use an existing project, which is explained in this Spring tutorial. Once the image was completely downloaded, it ran hello-world in a container. Since it wasn’t present, it went to Docker Hub and downloaded the latest image. Then it runs the container, which displays a message telling us everything’s working fine, and then it spells out the process it took to run the image.ĭocker looked for a local copy of the hello-world image. Since it is not there it downloads it from Docker Hub. Your version may be different, depending on your platform.ĭocker run hello-world does what it sounds like – it runs an image named hello-world.įirst, it looks for this image on the local system. The first command checks docker’s version. This message shows that your installation appears to be working correctly. Status: Downloaded newer image for hello-world:latest Next, verify the installation with the following two commands: $ docker -version #Docker logs download#Download the correct installer for your operating system and follow the instructions. #Docker logs install#Docker setup and installation Install Dockerįirst, start by installing the Docker desktop tools found here. In this tutorial, we’ll package a Spring Boot application, run it, and look at the different commands for managing images and containers. ![]() Containers are also an excellent first step toward moving toward a flexible and cost-effective cloud architecture. Running a service in a container augments development with a common target platform for development, testing, and deployment. Java microservices are a good target for Docker. Images, the packages Docker uses for applications, are truly cross-platform. ![]() It can run containers on any system that supports the platform: a developer’s laptop, systems on “on-prem,” or in the cloud without modification. Intro to managing and running a containerized Java Spring Boot applicationĭocker is a platform for packaging, deploying, and running applications in containers. ![]()
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