Helm helps you manage Kubernetes applications - Helm Charts helps you define, install, and upgrade even the most complex Kubernetes application.

1. Package Manager in K8S
Piotr Perzyna - 03/21/2018

2. Agenda
● What is HELM?
○ 4 Words to know
● How to use it?
● Why teams HELM?

3. What is HELM?
HELM is a package manager like . . . . . . . . for kubernetes app.
● npm
● brew
● pip
● apt
● yum

4. Simple chart
$ helm create application
application/
values.yml # A YAML file containing sample
values
chart.yaml # A YAML file containing information about the
chart
README.md # OPTIONAL: A human-readable README file
requirements.yaml # OPTIONAL: A YAML file listing
charts/ # OPTIONAL: A directory containing depends
charts.
templates/ # OPTIONAL: A directory of
templates K8S manifest
deployment.yml # EXAMPLE
configmap.yml # EXAMPLE
secrets.yml # EXAMPLE
service.yml # EXAMPLE

5. Sample chart
service.yml
apiVersion: v1
kind: Service
metadata:
name: {{ .Values.name }}
namespace: {{ .Values.namespace }}
labels:
app: {{ .Values.name }}
release: {{ .Release.Name }}
spec:
type: {{ .Values.service.type }}
ports:
- protocol: TCP
port: {{ .Values.service.port }}
targetPort: 8000
selector:
app: {{ .Values.name }}
release: {{ .Release.Name }}
values.yml
namespace: default
name: application
image:
repository: 10clouds/application
tag: latest
pullPolicy: IfNotPresent
service:
type: NodePort
port: 80
env:
DJANGO_DEBUG: ‘1’
…
…
…

6. 4 Words to know!
chart
templated K8S manifest
charts repository
registry of charts
+
chart + value = release
tiller
pod to manage releases
1 2
3 4

7. Manage charts
Install
$ helm install -n release-name -f values.yml ./application
LIST
$ helm list --all
NAME VERSION UPDATED STATUS CHART
release-name 1 10:00 21/03/2018 DEPLOYED application-1.0.0
production 44 09:15 21/03/2018 DELETED another_app-1.0.0
UPDATE
$ helm upgrade --recreate-pods -f values.yml --set image.tag=123 release-name ./application
ROLLBACK
$ helm rollback --recreate-pods release-name <version>

8. Why teams HELM?
● easy install
● app portability
● versionable
● easy rollbacks
● templatable
● better then kubectl apply -f

9. Q&A

10. THE END
Thank you for your attention!
Piotr Perzyna, 10Clouds