Overview:

Sharing SpringBoot application with Docker images!

Intro:

First, create a simple API, in this case we create the fortuneCookie API.

Tips:

1º Create .jar file:

If you are using gradle on Intellij IDE, go to gradle bar at top right, go to Tasks -> Build -> assemble.

2º Creating application container

Dockerfile - {fortuneCookie/Dockerfile}

• The first line we determine java version from DockerHub;
• The second one we copy and rename our app file;
• The last one we execute the command.

To create docker image, run:

docker build -t "your User"/fortunecookie:v1 .

Finally, we are Done! Time to test, run:

docker run -it -p 8080:8080 "your user"/fortunecookie:v1

Go to your browser: localhost:8080

So, you create the API, the docker file and the container for your app! Well done!

3º Sharing Containers

First, create a .tar from your container. Run:

docker save "your user"/fortunecookie:v1 > fortunecookie.tar

After copy the .tar to other system, its time to RUN THIS API!

In the .tar folder, open the terminal and run:

docker load --input fortunecookie.tar

• This command loads an image from a .tar archive.

Successful I guess? So, run:

docker images

• This command list docker images

Now you can see the image of your app.

Finally, run:

docker run --publish 8080:8080 --detach "Name of the image showed in the previous list"

• 8080:8080 : You can set the containers port. localPort:ContainerPort;
• --detach : Set Docker to run this container in the background.

Time to test, go to your browser: localhost:8080

Well done young Padawan!