Helm Hook Flow
Chart Template 생성
helm create mychart
불필요한 파일 삭제
rm -rf deployment.yaml hpa.yaml ingress.yaml service.yaml serviceaccount.yaml tests/test-connection.yaml
Pod 및 Deployment 생성
pre-pod.yaml 생성
apiVersion: v1
kind: Pod
metadata:
name: pre-pod
annotations:
helm.sh/hook: pre-upgrade
spec:
restartPolicy: Never
containers:
- name: container
image: kubetm/init
command: ["sh", "-c", "echo 'start'; sleep 10; echo 'done'"]
- 배포 전에 확인차 만들어지는 Pre-pod
deployment.yaml 생성
apiVersion: v1
kind: Service
metadata:
name: svc
spec:
selector:
type: app
ports:
- port: 80
targetPort: 8080
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: deployment
spec:
selector:
matchLabels:
type: app
replicas: 1
template:
metadata:
labels:
type: app
annotations:
rollme: {{ randAlphaNum 5 | quote }}
spec:
initContainers:
- name: init-myservice
image: kubetm/app
command: ["sh", "-c", "echo 'start'; sleep 10; echo 'done'"]
containers:
- name: container
image: kubetm/app
post-pod.yaml 생성
apiVersion: v1
kind: Pod
metadata:
name: post-pod
annotations:
helm.sh/hook: post-upgrade
spec:
restartPolicy: Never
containers:
- name: container
image: kubetm/init
command: ["sh", "-c", "echo 'start'; sleep 10; echo 'done'"]
tests/test-pod.yaml 생성
apiVersion: v1
kind: Pod
metadata:
name: test-pod
annotations:
helm.sh/hook: test
spec:
restartPolicy: Never
containers:
- name: container
image: kubetm/init
command: ["sh", "-c", "echo 'start'; curl svc/hostname; echo 'done'"]
crds/crd-pod.yaml
apiVersion: v1
kind: Pod
metadata:
name: crd-pod
annotations:
helm.sh/hook: pre-upgrade
spec:
restartPolicy: Never
containers:
- name: container
image: kubetm/init
command: ["sh", "-c", "echo 'start'; sleep 10; echo 'done'"]
Install
helm upgrade mychart ./../ -n nm-1 --create-namespace --install
kubectl get pods -n nm-1
Upgrade
helm upgrade mychart ./../ -n nm-1 --create-namespace --install
kubectl get pods -n nm-1
Test
helm test mychart -n nm-1
kubectl get pods -n nm-1
- 앱을 배포하기 전에 확인을 해보고 성공시에만 배포를 하는 경우 등 App의 기능을 보조
- 쿠버네티스 리소스 생성시 우선순위 할당 가능
[참조]: 인프런 - 대세는 쿠버네티스 [Helm편]
끝!
