AKS Demo App

A simple .NET Core / Angular application

aks-demo-app is a simple application to demonstrate basic concepts of kubernetes (k8s) and Azure Kubernetes Services (AKS). The app consists of four Docker images and a SQL database. The SQL database won't be hosted inside of k8s, instead Microsoft's PaaS offering (SQL Azure) is used. The Sample is licensed under MIT

• An Angular SPA
• .NET Core 2.0
  • An API for reading Sessions Sessions.API
• .NET Core 2.0
  • An API for reading votes and persisting new votes Votings.API
• .NET Core 2.0 CronJob
  • Which will remove old audit logs from SQL database Sessions.AuditLogCleaner

Cloud Environment

For running and hosting the application, the following environment is required.

- SQL Azure
- Azure Container Registry (ACR)
- Azure Kubernetes Service (AKS)

The cloud environment can be deployed using Terraform. The subfolder terraform contains already the environment and can be configured according to your needs by specifying your settings in a terraform.tfvars file. The terraform/terraform.tfvars.sample contains an example configuration.

Developer Environment Requirements

- Azure CLI (`az`)
- Kubernetes Control (`kubectl`)
- Docker (`docker`)

Generating the Database

• Define a firewall exception for your local IP address on SQL Azure (SQL Server).
• Create a new (empty) SQL Database
• Set the connection string temporary as ENVIRONMENT Variable with the name DbConnectionString
• Execute EF Migrations (Sessions.Migrations C# Project in /backend/Sessions.Migrations) using VS or Rider to generate the database from the current C# model

Building Docker images

Docker images must be generated for all four components. Replace thhdemo.azurecr.io with your ACR instance identifier.

$ cd backend
backend $ docker build -t thhdemo.azurecr.io/sessions:latest -f sessions-ms.Dockerfile .
backend $ docker build -t thhdemo.azurecr.io/votings:latest -f votings-ms.Dockerfile .
backend $ docker build -t thhdemo.azurecr.io/sessions-cleaner:latest -f log-cleaner.Dockerfile .
backend $ cd ..
cd frontend
frontend $ docker build -t thhdemo.azurecr.io/frontend:latest .

Push images to ACR

Replace thhdemo with your ACR instance identifier

$ az acr login --name thhdemo
$ docker push thhdemo.azurecr.io/sessions-api:1.0.0
$ docker push thhdemo.azurecr.io/votings-api:1.0.0
$ docker push thhdemo.azurecr.io/sessions-cleaner:1.0.0
$ docker push thhdemo.azurecr.io/sessions-spa:1.0.0

Prepare AKS deployment

All kubernetes resources are defined in deployment directory. You'll find a secrets.template.yaml there. Rename it to secrets.yaml and replace the token <<base64 ...>> with your DB connection string in base64. You can generate a base64 representation using the following command:

$ echo -n 'my connectionstring' | base64

Update backend.yaml, frontend.yaml and cronjob.yaml and provide correct name for your docker images (again replace thhdemo.azurecr.io with your ACR stuff).

Deploy to AKS

Execute the following commands to deploy everything to AKS:

$ cd deployment
deployment $ kubectl create -f secrets.yaml
deployment $ kubectl create -f services.yaml
deployment $ kubectl create -f backend.yaml
deployment $ kubectl create -f frontend.yaml
deployment $ kubectl create -f cronjob.yaml

Scale deployments

$ kubectl scale deployment sessions-api --replicas 5
$ kubectl scale deployment votings-api --replicas 5
$ kubectl scale deployment sessions-spa --replicas 3