Dockerfile. Hello dear friends. In this video, we will learn about Dockerfiles. To put it briefly, Dockerfiles allow you to containerize your application. You know, we generated our project templates using Open Liberty. Open Liberty also generates Dockerfiles for your projects. As you see here, there is a Dockerfile. We can use it to containerize our application. Let's open a terminal window in the project folder, list the files. Okay, there is the Dockerfile. The only thing we need to do is add the expose port definition. Let's add it. First, look at our server.xml file to see which port we need to export. Open Dockerfile, add expose ports. Okay, save the changes. To containerize our project, let's run docker build -t, project name. Okay, this is going to take a while. All right, we have a container for our project. We can run it by typing, docker run -dp port 1 -p port 2 container name. All right, it started. We can see it in the container list. As you can see here, we can see it in the container list. Let's try to open the user interface. All right. As you can see it works. So, now we've learned about Dockerfiles. I'll see you in the next lesson.