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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

Clock icon Intermediate
Clock icon 30m
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""CentOS Base Image" 
    RUN yum -y update
    RUN yum -y install httpd
    CMD ["/usr/sbin/httpd", "-D", "FOREGROUND"]
    EXPOSE 80
  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

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