How to turn a jar package into a docker container

How to turn a jar package into a docker container

1. First download the java image

docker pull java:8

2. Create a new working directory and copy the jar package into it

mkdir mydocker
cd mydocker
copy /xxx/app.jar ./

3. Create a new Dockerfile

vi Dockerfile

The file contents are as follows:

FROM java:8
MAINTAINER freebytes.net
WORKDIR /test
COPY app.jar /test/app.jar
CMD ["java","-jar","app.jar","-Dfile.encoding=utf-8"]

Code Explanation

• FROM java:8 —— indicates that the image is built based on java:8
• MAINTAINER author——Indicates that the author of the build is author
• WORKDIR /test ——Indicates that the working directory in the specified container is /test
• COPY - copy app.jar to the container working directory /test
• CMD - executes the java command to start the jar.

4. Build an image

docker build -t app-docker .

Indicates building an image from the current directory. This command will package all the files in the current directory and send them to the Docker engine server, and then build the image according to the Dockerfile on the server.

5. After the build is successful, start the container

docker run -it -p 9013:8088 –name app -d my-docker

According to the Dockerfile configuration just now, after the container is generated, a test directory will inevitably be generated in the container root directory, and the app.jar file will exist in the test directory. The container executes the instructions defined by CMD based on the test directory.

Can enter the container to view

docker exec -it app /bin/bash

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