Optimizing Kubernetes deployments with Helm

Erwin de Gier - Trifork Amsterdam
Optimizing Kubernetes deployments with Helm
@erwindeg github.com/erwindeg edegier.nl

Project deliveries
EAR WAR JAR
Docker
Images
YML

Redis Master
(Container)
Redis Slave
(Container)
PHP Webserver
(Container)
PHP Webserver
(Container)
PHP Webserver
(Container)
Redis Slave
(Container)
Redis Master
(Service)
Frontend
(Service)
Redis Master
(Service)

source: http://helm.sh

source: https://blog.hasura.io/draft-vs-gitkube-vs-helm-vs-ksonnet-vs-metaparticle-vs-skaffold-f5aa9561f948

Prerequisites
• Connection to a Kubernetes Cluster

• Docker Edge with Kubernetes

• Mini-Kube

• Hosted Kubernetes (GKE, AWS)

• Installation of Helm (homebrew / download)

https://github.com/erwindeg/k8s-helm

$ kubectl config current-context 
docker-for-desktop 
$ helm init 
Tiller (the Helm server-side component) has been installed into your Kubernetes Cluster. 
Happy Helming!
$ git clone https://github.com/erwindeg/k8s-helm 
$ cd k8s-helm 
$ helm install --name helm-gb-chart --namespace helm-gb ./helm_chart_guestbook 
NAME: helm-gb-chart 
LAST DEPLOYED: Fri Apr 20 15:44:13 2018 
NAMESPACE: helm-gb 
STATUS: DEPLOYED

NAME READY STATUS RESTARTS
frontend-788d978f9b-bwm5p 1/1 Running 0
frontend-788d978f9b-hxmj6 1/1 Running 0
frontend-788d978f9b-mpvk5 1/1 Running 0
redis-master-7747787588-wp5cr 1/1 Running 0
redis-slave-865486c9df-8mcx5 1/1 Running 0
redis-slave-865486c9df-pnk5m 1/1 Running 0
$ kubectl get pods --namespace helm-gb

NAME TYPE CLUSTER-IP PORT(S)  
frontend NodePort 10.107.212.37 80:32080/TCP 
redis-master ClusterIP 10.106.134.71 6379/TCP 
redis-slave ClusterIP 10.108.147.227 6379/TCP

$ kubectl get svc --namespace helm-gb

$ helm list 
NAME REVISION UPDATED STATUS CHART  
helm-gb-chart 1 Fri Apr 20 15:44:13 2018 DEPLOYED Guestbook-Chart-1.0.0 
 
$ helm upgrade helm-gb-chart helm_chart_guestbook --set /frontend.image=harshals/gb-frontend:1.1 
Release "helm-gb-chart" has been upgraded. Happy Helming!
 
$ helm list 
NAME REVISION UPDATED STATUS CHART 
helm-gb-chart 2 Fri Apr 20 16:05:51 2018 DEPLOYED Guestbook-Chart-1.0.0

$ helm history helm-gb-chart 
REVISION UPDATED STATUS CHART DESCRIPTION
1 Fri Apr 20 15:44:13 2018 SUPERSEDED Guestbook-Chart-1.0.0 Install complete
2 Fri Apr 20 16:05:51 2018 DEPLOYED Guestbook-Chart-1.0.0 Upgrade complete
$ helm rollback helm-gb-chart 1
Rollback was a success! Happy Helming!
$ helm history helm-gb-chart 
REVISION UPDATED STATUS CHART DESCRIPTION 
1 Fri Apr 20 15:44:13 2018 SUPERSEDED Guestbook-Chart-1.0.0 Install complete 
2 Fri Apr 20 16:05:51 2018 SUPERSEDED Guestbook-Chart-1.0.0 Upgrade complete 
3 Mon Apr 23 08:49:15 2018 DEPLOYED Guestbook-Chart-1.0.0 Rollback to 1

source: https://blog.hasura.io/draft-vs-gitkube-vs-helm-vs-ksonnet-vs-metaparticle-vs-skaffold-f5aa9561f948
https://github.com/kubernetes/charts

Gitlab CI
Docker
Registry
Kubernetes
helm upgrade —install $release-name $chartname —set image.tag=$branch_commit-hash
$branch_commit-hash
push

Gitlab CI
Docker
Registry
Kubernetes
helm upgrade $release-name $chartname
$branch_commit-hash
push
Chart
Repository upgrade
upload

Alternatives
• Kubectl

• Terraform Kubernetes provider

Conclusion
• Manage complex applications

• Versioning and updates

• Rollback

• Sharing

Optimizing Kubernetes deployments with Helm

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