Lab Information

An issue has arisen with a static website running in a container named nautilus on App Server 1. To resolve the issue, investigate the following details:

Check if the container's volume /usr/local/apache2/htdocs is correctly mapped with the host's volume /var/www/html.



Verify that the website is accessible on host port 8080 on App Server 1. Confirm that the command curl http://localhost:8080/ works on App Server 1.

Lab Solutions

🔑 Step 0: Login to Application Server 1

ssh tony@stapp01

Password:

Ir0nM@n

🔍 Step 1: Check volume mapping of the container

docker inspect nautilus

Focus on the Mounts section.

You should see something like:

"Mounts": [

{

"Source": "/var/www/html",

"Destination": "/usr/local/apache2/htdocs",

"Type": "bind"

}

]

✅ This confirms the volume is correctly mapped.

🔍 Step 2: Verify port mapping

Still inside docker inspect output, check Ports:

"Ports": {

"80/tcp": [

{

"HostPort": "8080"

}

]

}

✅ This confirms container port 80 is mapped to host port 8080.

🌐 Step 3: Verify website accessibility (MANDATORY)

Run on App Server 1:

curl http://localhost:8080/

Expected result

[tony@stapp01 ~]$ curl http://localhost:8080/

curl: (7) Failed to connect to localhost port 8080: Connection refused

Fix it

docker ps

docker start nautilus

docker ps

docker port nautilus

curl http://localhost:8080/

Expected result

[tony@stapp01 ~]$ curl http://localhost:8080/

Welcome to xFusionCorp Industries!

🧠 Part 2: Simple Step-by-Step Explanation (Beginner Friendly)

🪜 What are we checking?

We are verifying two things only:

File connection (volume mapping)

Network connection (port mapping)

📁 Volume Mapping Explained

Website files live on the host:

/var/www/html

Apache inside container reads from:

/usr/local/apache2/htdocs

Volume mapping connects them like a shared folder

If mapping is correct:

Updating files on host updates website instantly

🌐 Port Mapping Explained

Apache listens on port 80 inside container

Docker exposes it as port 8080 on host

So:

curl http://localhost:8080/

means:

“Ask the container’s Apache server for the website.”

🧠 Exam Memory Hook

Inspect → Mounts → Ports → Curl

If curl works, everything is wired correctly.

Resources & Next Steps

📦 Full Code Repository: KodeKloud Learning Labs

📖 More Deep Dives: Whispering Cloud Insights - Read other technical articles

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Credits

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