Create a Custom Docker Image

30 minutes
  • 4 Learning Objectives

About this Hands-on Lab

In this lab you are required to create a custom Docker image of CentOS, and you need to run the Apache web server on it. You can expose port **8080** for Apache. This way when you run your Docker container with the image, to test things out, you will be accessing your web server at port **80** but it will be remapped to port **8080** in the container. In short, you need to write a Dockerfile, populate it with instructions, build an image based on the Dockerfile, and then run the container with that image.

**Note:** Please give the lab an extra minute before connecting via SSH into the instance.

Learning Objectives

Successfully complete this lab by achieving the following learning objectives:

Install and Start Docker
sudo yum install docker 
sudo systemctl start docker 
sudo systemctl enable docker 
Write a Dockerfile in /home/cloud_user/ Which Will Be Used to Create a Custom Image
vim /home/cloud_user/Dockerfile
FROM scratch
ADD centos-7-x86_64-docker.tar.xz /

LABEL org.label-schema.schema-version="1.0" 
    org.label-schema.name="CentOS Base Image" 
    org.label-schema.vendor="CentOS" 
    org.label-schema.license="GPLv2" 
    org.label-schema.build-date="20191001"

RUN yum -y update
RUN yum -y install httpd

CMD ["/usr/sbin/httpd", "-D", "FOREGROUND"]
EXPOSE 80
ESC
:wq
ENTER
Build an Image from the Dockerfile
cd /home/cloud_user/
sudo docker build -t cloud_user/my_webserver:v1 .
Open Port 8080 with Firewalld and Run a Container from an Image and Test It Out
sudo firewall-cmd --add-port=8080/tcp --permanent
sudo firewall-cmd --reload 
sudo docker run -d -p 8080:80 --restart=always --name my_webserver cloud_user/my_webserver:v1

Additional Resources

The centos-7-x86_64-docker.tar.xz file is located in /home/cloud_user/.

You need to include it in the Dockerfile, and from it create a docker image for the Apache web server.

Firewalld is up and running.

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