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Create a Custom Docker Image

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.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 30m
Published
Clock icon Apr 03, 2020

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Table of Contents

  1. Challenge

    Install and Start Docker 

    sudo yum install docker 

    sudo systemctl start docker 
sudo systemctl enable docker

  2. Challenge

    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

  3. Challenge

    Build an Image from the Dockerfile 

    cd /home/cloud_user/

    sudo docker build -t cloud_user/my_webserver:v1 .

  4. Challenge

    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
A Cloud Guru - Labs - Create a Custom Docker Image
Author
A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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