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STAGE 08 / NETWORKING FOUNDATIONS

DevOps networking and application deployment project

Understand application connectivity requirements and plan a deployment with monitoring and rollback.

Before you begin

Understand IP, DNS, application ports and automation.

Application networking requirements

A deployment can start successfully while users cannot reach it. The application may listen on the wrong address, a port may not be published, DNS may be wrong or a policy may block the path. DevOps work connects development and operations practices to deliver and operate changes reliably; tools alone do not define it.

Local application deployment project

  1. Write a small static web page and keep it in version control.
  2. Serve it locally, bound to a deliberate local address and port.
  3. Record the service address, DNS/name choice and expected HTTP response.
  4. Containerise it if your computer supports the runtime.
  5. Automate a check, make one change and show the before/after result.
  6. Document how to stop it and restore the previous working version.

Build pipelines can validate and package a change. Deployment makes a version available; monitoring checks its behaviour afterwards. Keep credentials out of source control and logs. Infrastructure state and backups can contain secrets too.

Next learn Linux, Git, scripting, containers, CI/CD concepts and observability. Practise small repeatable deployments before adding complex orchestration. A networking foundation helps you follow the request from client to name resolution, connection, application and response.

Practical exercise

A container reports running, but localhost on its intended port returns connection refused. What should you inspect?

Show the answer and explanation

Inspect application logs, whether the application listens on the expected interface and port, and the runtime port mapping. A running process/container is not the same as a reachable HTTP service.

QUICK KNOWLEDGE CHECK

Check your understanding

What should happen after deployment?

Related labs and exercises

Practice tools

Sources & content checks

Technical references checked on 25 October 2026. These are original teaching explanations, not official Cisco course material. See how content and lab validation are described.

Project documentation and verification results

Download the project brief and evidence worksheet. Fill in the actual tools, versions, observations and limitations; leave nothing labelled tested without evidence.

Your progress

Mark this complete when you can explain the example and do the exercise.