Task Information
As per recent requirements shared by the Nautilus application development team, they need custom images created for one of their projects. Several of the initial testing requirements are already been shared with DevOps team. Therefore, create a docker file /opt/docker/Dockerfile (please keep D capital of Dockerfile) on App server 1 in Stratos DC and configure to build an image with the following requirements:
a. Use ubuntu:24.04 as the base image.
b. Install apache2 and configure it to work on 6300 port. (do not update any other Apache configuration settings like document root etc).
Task Solutions
Part 1: Lab Step-by-Step Guidelines
✅ Task
On App Server 1 (stapp01), create this file:
/opt/docker/Dockerfile
Use these requirements:
Base image: ubuntu:24.04
Install apache2
Configure Apache to run on port 6300
Do not change other Apache settings
🔹 Step 1: Login to Jump Host
ssh thor@jump-host
# Password:
mjolnir123
🔹 Step 2: SSH into App Server 1
ssh tony@stapp01
# Password:
Ir0nM@n
🔹 Step 3: Create Docker directory
sudo mkdir -p /opt/docker
🔹 Step 4: Create Dockerfile
Run:
sudo vi /opt/docker/Dockerfile
Press i and paste this content:
FROM ubuntu:24.04
ENV DEBIAN_FRONTEND=noninteractive
RUN apt update && \
apt install apache2 -y && \
sed -i 's/Listen 80/Listen 6300/' /etc/apache2/ports.conf && \
sed -i 's/<VirtualHost *:80>/<VirtualHost *:6300>/' /etc/apache2/sites-available/000-default.conf
EXPOSE 6300
CMD ["apachectl", "-D", "FOREGROUND"]
Save and exit:
Esc :wq
🔹 Step 5: Verify file exists
cat /opt/docker/Dockerfile
Part 2: Simple Step-by-Step Explanation (Beginner Friendly)
✅ What is happening?
You need to create a Dockerfile.
A Dockerfile is a recipe Docker uses to build custom images.
✅ Why use ubuntu:24.04?
This line:
FROM ubuntu:24.04
means:
Start from Ubuntu version 24.04.
✅ Why install apache2?
This line installs Apache web server:
apt install apache2 -y
✅ Why change port 80 to 6300?
Default Apache port:
80
Required port:
6300
So we edit:
/etc/apache2/ports.conf
/etc/apache2/sites-available/000-default.conf
✅ Why use CMD?
CMD ["apachectl", "-D", "FOREGROUND"]
This starts Apache when container runs.
⚠️ Common Mistakes
❌ Mistake 1: Wrong filename
Must be exactly:
/opt/docker/Dockerfile
Capital D matters.
❌ Mistake 2: Forgetting VirtualHost change
Need both:
Listen 6300
VirtualHost *:6300
❌ Mistake 3: Using wrong base image
Correct:
ubuntu:24.04
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