OpsForDevs

devops bootcamp material that I have taught at previous companies

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Exercise 5: Local Deployment

Objective

Deploy your packaged application locally using either a Vagrant cluster or a Minikube cluster, setting up one database server and one application server.

Prerequisites

• Completed Exercise 4 (Packaging and Versioning)
• Vagrant or Minikube installed on your local machine
• Basic understanding of Kubernetes (if using Minikube)

Instructions

1. Retrieve Your Package
   • Download the package (Docker image or Vagrant box) you created in Exercise 4 from your chosen artifactory.

2. Choose Your Deployment Method Select either Vagrant or Minikube for your local deployment:

   Option A: Vagrant Cluster

   a. Create a Vagrantfile that defines two VMs:

   • One for the database server
   • One for the application server

   b. Configure the Vagrantfile to:

   • Set up networking between the VMs
   • Install necessary software (e.g., Docker, database software)
   • Pull and run your application package

   c. Use vagrant up to start your cluster

   Option B: Minikube Cluster

   a. Start Minikube:

      minikube start
   

   b. Create Kubernetes manifests for:

   • A deployment for your application
   • A service to expose your application
   • A deployment for your database
   • A service for your database
   • (Optional) A persistent volume for database data

   c. Apply your Kubernetes manifests:

      kubectl apply -f your-manifests.yaml
   

3. Configure Your Application
   • Ensure your application is configured to connect to the database server
   • Set any necessary environment variables or configuration files
4. Verify Deployment
   • Access your application (via browser or API calls)
   • Confirm that it’s connected to the database and functioning correctly
5. Test Scaling (Optional)
   • For Vagrant: Create additional application server VMs
   • For Minikube: Scale your application deployment

     kubectl scale deployment your-app-deployment --replicas=3
     

6. Clean Up
   • For Vagrant: Run vagrant destroy
   • For Minikube: Delete your resources or run minikube delete

Bonus Tasks

1. Implement a load balancer for your application servers
2. Set up monitoring for your local cluster (e.g., Prometheus and Grafana)
3. Implement a simple CI/CD pipeline that deploys to your local cluster on code changes

Deliverables

1. Vagrantfile or Kubernetes manifests used for deployment
2. Screenshots or terminal output showing:
   • Successful deployment
   • Application running and connected to the database
   • (If attempted) Scaled deployment
3. Brief documentation of your deployment process and any challenges faced

Remember, the goal is to create a local environment that mimics a production setup. This exercise will help you understand the complexities of deploying and managing multi-service applications.