Kubernetes Code Components Meetup

Presentation

Kubernetes Code Components

Prerequisites

1. A running Kubernetes Cluster - AKS Instructions
2. Helm - Installation Instructions
3. Draft - Installation Instructions
4. kubectl - Installation Instructions
5. Docker - Installation Instructions

Nodeless Jenkins on Kubernetes

Set up Jenkins using helm

# if this is the first time you are using helm, please uncomment the line below.

# helm init

helm install --name jenkins stable/jenkins

# Alternatively, if you are having issues with the persistant volume class, you can still install jenkins from the chart provided in this repo:
# helm install --name jenkins jenkins-helm/.
# or to pass the storage class parameter:
helm install --name jenkins stable/jenkins --set Persistence.StorageClass=default

# the provided chart also Adds ACI plugin and Azure AD plugin (needs to be configured though)

Get Jenkins admin password

printf $(kubectl get secret --namespace default jenkins-jenkins -o jsonpath="{.data.jenkins-admin-password}" | base64 --decode);echo

Build a Docker Image for Jenkins Slave on your own

git clone https://github.com/idanshahar/K8SCodeComponentsMeetup.git

cd KubernetesCodeComponents/jenkins

docker build . --tag ${YOUR_DOCKER_REGISTRY}:${TAG}

docker push ${YOUR_DOCKER_REGISTRY}:${TAG}

Jenkins Configuration

Go to "Manage Jenkins" -> "Configure System"

1. Under Container Template, change the Docker Image to: idanshahar/jenkins-slave:latest
2. Add the following host path volumes: /var/run/docker.sock, /usr/bin/docker
3. Create a new Pipeline job and select the jenkins file from git
4. Change kubernetes url to 10.0.0.1

Go to "Credentials" -> "System" -> "Global credentials" -> "Add Credentials"

1. Choose "Global" Scope
2. Add your Dockerhub credentials
3. Insert 'docker-hub-credentials' as the credentialls ID

Containerize applications using Draft

# cd to your app root folder
cd node-draft

draft init #initialize draft

draft create 

draft up

Monitoring

Official Kubernetes Metrics Project

Implementations

1. Heapster
2. Metrics Server
3. Prometheus Adapter
4. Google Stackdriver (coming soon)