Learn how to get Kubernetes up and running on Google Cloud Platform with GKE. Go over why you should use Kubernetes, and why using a managed service like GKE is important. After that we will go over how to deploy both simple and advanced applications to your cluster.

1. Get started with Kubernetes
on GKE
Zach Russell - GDG Cloud Philly

2. Follow Along!
zachary-russell/kubernetes-on-gke
zachrussell.net/kubernetes-on-gke

3. Agenda
● Cover the basic Kubernetes nomenclature and concepts
● Create a cluster on GKE
● Deploy a simple app on GKE
● Deploy WordPress on GKE

4. What is Kubernetes?
● Open source system of managing containerized
applications
● Developed by Google after 15 years of running
containers in production
● Scalable - add as many servers to the cluster
● Portable - run on bare metal, private or public
clouds

5. Why use Kubernetes
Enterprises
● Run on bare metal for max performance
● Vendor neutral infrastructure
● Multi Cloud
● Variable capacity
● Multi tenancy
● Possibly use spot instances for temp
workloads
SMBs & Startups
● Streamline devops and production
engineering workflows
● Multi tenancy
● Infrastructure can grow with needs
● Modular (only scale what you need to)
● GKE: Committed Use Discounts

6. Why use GKE
● Installing Kubernetes is complex
● Fully managed by Google SREs
● Auto scale
● Auto upgrade
● Container Optimized OS
● GPUs!
● Integrated Logging/Monitoring (via Stackdriver)
● FREE!

7. The Basics

8. Kubernetes Master & Nodes
● Master coordinates the cluster
● Nodes run the processes
● GKE manages the Kubernetes Master with regional replication

9. Kubernetes Deployment
● Deployment instructs Kubernetes how to create and update instances of
your application.
● Master schedules applications to run on nodes

10. Kubectl
● CLI for interacting with the Kubernetes API

11. Pods
● Group of one or more containers with shared resources
○ Network (unique IP)
○ Storage

12. Service
● Defines how pods communicate (i.e. a microservice)
○ Pod-to-pod communication within a cluster
○ Communication outside the cluster (i.e. a website)
■ ClusterIP
■ Nodeport
■ LoadBalancer
■ ExternalName

13. Create Cluster
1. Install gCloud SDK and Kubectl ($ gcloud components install kubectl)
2. Start cluster $ gcloud container clusters create [cluster-name]
3. Get auth creds $ gcloud container clusters get-credentials
[CLUSTER_NAME]
4. $ kubectl run hello-server --image gcr.io/google-samples/hello-app:1.0 --
port 8080
5. $ kubectl expose deployment hello-server --type "LoadBalancer"

14. Run WordPress on GKE

15. Kubernetes Infrastructure as Code
All Kubectl commands can be stored as code (YAML) and deployed to the
cluster.
1. For volume claims $kubectl apply -f [file_name].yaml
2. For depoyments & services $kubectl create -f [file_name].yaml

16. Step 1: Create PersistentVolumes and
PersistentVolumeClaims
● PresistentVolumeClaim is a request for storage
● If no volume exists, one is dynamically provisioned
● GKE creates PersistentVolumes backed by persistent disks
$ kubectl apply -f mysql-volumeclaim.yaml
$ kubectl apply -f wordpress-volumeclaim.yaml

17. Step 2: Deploy MySQL
● Create secret - $ kubectl create secret generic mysql --from-
literal=password=YOUR_PASSWORD
● Deploy Service - $ kubectl create -f mysql.yaml
● Confirm pod is running - $ kubectl get pod -l app=mysql
● Deploy MySQL Service - $ kubectl create -f mysql-service.yaml
● Confirm service is created - $ kubectl get service mysql

18. Step 3: Deploy WordPress
● Deploy manifest file $ kubectl create -f wordpress.yaml
● Confirm pod is running $ kubectl get pod -l app=wordpress
● Expose WordPress Service $ kubectl create -f wordpress-service.yaml
● Get service external IP $ kubectl get svc -l app=wordpress
● Access your site!

19. Cleanup
$ kubectl delete service wordpress
$ gcloud compute forwarding-rules list
$ kubectl delete pvc wordpress-volumeclaim
$ kubectl delete pvc mysql-volumeclaim
$ gcloud container clusters delete [cluster_name]

20. Resources
● Kubernetes.io
● Udacity - Scalable Microservices with Kubernetes (free course by Google)
● Kubernetes the Hard Way by Kacey Hightower
● Minikube
● Kubernetes Slack