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Last pushed: a year ago
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test project
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Dockerfile - building a git project

This project showcases how you can use Docker to fetch a git project, build it and Dockerize it. The Dockerfile I'm using is as simple as this:

FROM junhanlin/ubuntu-git-java-maven
VOLUME /tmp

RUN git clone https://github.com/alexturcot/sample-spring-boot-data-jpa-embedded.git
WORKDIR sample-spring-boot-data-jpa-embedded
RUN mvn install

WORKDIR target
RUN mv *.jar app.jar

ENTRYPOINT ["java","-jar","/sample-spring-boot-data-jpa-embedded/target/app.jar"]
`

In order to perform the git clone and mvn install, the image needs to have git installed, jdk8 and maven as well. I looked around and found junhanlin/ubuntu-git-java-maven's Dockerfile. Using his Dockerfile as a foundation, all that was left to do in mine is to:

Step by step - Ooh baby

To install docker, follow their instrution: https://docs.docker.com/engine/installation

Build this docker image

The first step is to create a Dockerfile. You may download the Dockerfile from this repository and drop it where you wish.
Then go into the folder containing the Dockerfile and type:

$ docker build -t sample-spring-boot-data-jpa-embedded:latest .

This builds the image named example-spring-boot-docker using the Dockerfile in current directory, with tag latest.

Sending build context to Docker daemon 160.8 kB
Step 1 : FROM junhanlin/ubuntu-git-java-maven
latest: Pulling from junhanlin/ubuntu-git-java-maven
6599cadaf950: Downloading 15.13 MB/65.69 MB
23eda618d451: Download complete
f0be3084efe9: Download complete
52de432f084b: Download complete
a3ed95caeb02: Download complete
df795cb63d4e: Downloading 13.74 MB/21.61 MB
8a129a343884: Download complete
125c23d71697: Download complete
f7acce206ed4: Downloading 4.658 MB/7.008 MB
15995c5d2cff: Waiting
35c1e24633a2: Waiting
cbdce6edf507: Waiting
ac4553028b08: Waiting
e7f664869d5d: Waiting
62465d934146: Waiting
38c6c2c5be52: Waiting
39313924067c: Waiting

This builds your first docker image.
Once it's done, you can view the images added to your local repository:

$ docker images
REPOSITORY                              TAG                 IMAGE ID            CREATED             SIZE
sample-spring-boot-data-jpa-embedded    latest              226b42be11a0        3 minutes ago       871.2 MB
junhanlin/ubuntu-git-java-maven         latest              c0e8627e844e        12 weeks ago        790.7 MB

Launching your container

To launch the container (a running image is referred to as a container, kind of like a Class and an Object)

$ docker run -e spring_profiles_active=dev -p 8080:8080 -i -t sample-spring-boot-data-jpa-embedded:latest

In my case, the entrypoint of my image is a spring boot application.

  • -e spring_profiles_active=dev is to provide a spring profile
  • -p 8080:8080 is to open port on the docker container, so that I can reach it from my computer.

You can browse to http://localhost:8080/jpa/repo, to access the dockerized application. That's it.

Docker Pull Command
Owner
alexturcot

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