Scenario-101

Table of Contents

• Requirements
• Background & Highlights
• Procedures
  • Deployment
  • Verify Deployment
• More resources

Requirements

Scenario-101: 1-Node K8S Deployment I

• Objective: Get familiar with K8S concept. Here K8S stands for Kubernetes.
• Requirements:

1. Start one node of k8s in your laptop. Mac or Linux
2. Start a nginx webserver with one instance
3. Scale nginx service into 2 instances.
4. Get familiar with k8s dashboard. Find pods from GUI, check nginx log.

Background & Highlights

• Q: How to use your own docker image?

• Q: What does "kubectl expose deployment .." do behind the scene?

Procedures

For single node deployment, we have multiple choices. Here we use minikube.

Deployment

• Install virtualbox and minikube

which minikube
which kubectl

• Start env

# start a VM to host our deployment
minikube start

# Create k8s deployment and export service
kubectl apply -f .

Verify Deployment

• Check k8s web UI Dashboard

minikube dashboard

• List k8s resources

# list deployments
kubectl get deployment

# list service
kubectl get services

# list pods
kubectl get pods

• Check the first pod

# Get all pods
kubectl get pods -l app="nginx"

# Get the first pod
POD_NAME=$(kubectl get pods -l app="nginx" -o jsonpath="{.items[0].metadata.name}")
echo "POD_NAME: $POD_NAME"

# Login to the first pod
kubectl exec -ti $POD_NAME hostname

# Check log of the first pd
kubectl logs -f $POD_NAME

• Run functional test

# Get endpoint url of nginx service
kubectl get services

# Send requests
service_url="$(minikube service my-nginx-service --url)"
for((i=0; i< 5; i++)); do { curl -I "$service_url";}; done

Destroy env:

• Delete k8s resources

kubectl apply -R -f .

• Remove VM

minikube delete

More resources

• minikube: https://kubernetes.io/docs/getting-started-guides/minikube/
• k8s local solutions: https://kubernetes.io/docs/setup/pick-right-solution/#local-machine-solutions