Overview

Demo .NET Core 2.1 generic host background application running in OpenShift. Application pulls messages from Azure Service Bus and writes them to the console log.

Concepts

1. .NET Core
   1. Generic Host
   2. Configuration
   3. Hosted Services
2. OpenShift
   1. Config Map
   2. Secrets
   3. Deployment Config
   4. Namespaces/Projects
   5. OC CLI

Environment Setup

• install Docker for Windows (use Linux containers)
• install Visual Studio Code
• oc cluster up
• create Azure Service Bus Queue
  • Configure MessageProcessor.ConnectionString in appsettings.Development.json
  • Configure MessageProcessor.QueueName in appsettings.json
• (optional) install the dotnet-azsb (Azure Service Bus CLI). Provides the ability to create SaS tokens used to post http messages to the queue.
  • dotnet azsb queue sas create -n -k /messages

OpenShift Integration

Setup

• Get registry url:
  • login to OpenShift CLI as admin: oc login -u System:admin
  • oc get svc -n default | grep registry
• Get OpenShift access token:
  • login to OpenShift CLI as developer: oc login -u developer -p test
  • oc whoami -t
• Login to OpenShift registry: docker login -u developer -p k5iGmgVEj_O3Rx9JYOLC2ivoFoK1uTtkC-rqg25RSWw 172.30.1.1:5000
• Create project:
  • oc new-project myproject

CI/CD

• Build image: docker-compose build
• Tag image for OpenShift: docker tag samplehosting:latest 172.30.1.1:5000/myproject/samplehosting:1.0.0
• Push to registry: docker push 172.30.1.1:5000/myproject/samplehosting:1.0.0
• Apply config map: oc apply -f secrets.yml
• Apply secrets: oc apply -f configmap.yml
• Apply app
  • via UI
    • create OpenShift app from image: oc new-app myproject/samplehosting --name=mysamplehosting
  • via yaml
    • oc apply -f kubedeploy.yml -n myproject

Troubleshooting

• Execute commands: oc exec -it mysamplehosting-1-6mtlq /bin/bash
• Remote Shell: oc rsh mysamplehosting-1-6mtlq
• Logs: oc logs mysamplehosting-1-6mtlq