如何在Docker里跑Java

如何在Docker里跑Java

Docker is a great tool for packaging and deploying applications. However, running Java applications in Docker can be a bit tricky. This is because the Java runtime is not included in most Docker images.

Fortunately, there are a few ways to run Java applications in Docker. In this article, we'll show you how to run a Java application in Docker using two different methods.

The first method is to use a pre-built Docker image that includes the Java runtime. There are a few different images available, but we recommend using the official OpenJDK image from Docker Hub.

To use this image, you can simply pull it from Docker Hub and then run your Java application as usual. For example:

docker pull openjdk:8-jdk-alpine docker run -it --rm --name my-java-app -v "$PWD":/usr/src/myapp -w /usr/src/myapp openjdk:8-jdk-alpine java -jar myapp.jar

This will pull the OpenJDK 8 image from Docker Hub and then run your Java application in a container.

The second method is to use a base Docker image and install the Java runtime yourself. This is a bit more work, but it has the advantage of being able to use any version of the Java runtime.

To do this, you'll first need to find a base image that includes a compatible version of the Linux operating system. We recommend using the Alpine Linux image, which is a small and lightweight Linux distribution.

Once you have a base image, you can install the Java runtime using a package manager. For example, on Alpine Linux you can use the apk command:

apk add --update openjdk8-jre

With the Java runtime installed, you can now run your Java application as usual. For example:

docker run -it --rm --name my-java-app -v "$PWD":/usr/src/myapp -w /usr/src/myapp alpine:3.7 java -jar myapp.jar

This will run your Java application in a container based on the Alpine Linux image.

Both of these methods can be used to run Java applications in Docker. Which one you choose will depend on your specific needs.