Create a Custom Docker Image

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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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Lab Info

Level

Intermediate

Last updated

Jul 06, 2022

Duration

30m

Challenge

Install and Start Docker

sudo yum install docker

sudo systemctl start docker 
sudo systemctl enable docker

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

Challenge

Build an Image from the Dockerfile

cd /home/cloud_user/

sudo docker build -t cloud_user/my_webserver:v1 .

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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