[Helm] Helm #helm

basics.sh

## locate installed helm charts in a namespace:
helm list

## add new local repo
helm repo add prometheus-community https://prometheus-community.github.io/helm-charts
helm repo update

## get available chart versions
# helm search repo <reponame>/<chartname> --versions
helm search repo prometheus-community/kube-prometheus-stack --versions

## dry run:
helm upgrade --dry-run \
     --namespace abc \
     --values ./pipelines/deploy/helm-test.yaml \
     --values ./pipelines/deploy/myapp/app-values.yaml \
     my-chart-name helm/job

## upgrade or install
helm upgrade --install \
     --namespace abc \
     --values ./pipelines/deploy/helm-test.yaml \
     --values ./pipelines/deploy/myapp/app-values.yaml \
     my-chart-name helm/job

## template charts locally
helm template \
	--values ./pipelines/deploy/helm-test.yaml \
    --values ./pipelines/deploy/myapp/app-values.yaml \
     my-chart-name helm/job
     
## set var on install:
helm template \
	--values ./pipelines/deploy/helm-test.yaml \
    --values ./pipelines/deploy/myapp/app-values.yaml \
    --set image.tage=v0.1 \
     my-chart-name helm/job

helm_test.sh

# Dockerfile
FROM bash:4.4
RUN apk add --update curl
COPY healthCheck.sh /
CMD ["bash", "/healthCheck.sh"]

# healthCheck.sh
echo "$DOMAIN"
sleep 30
RESPONSE=$(curl --write-out '%{http_code}' --silent --output /dev/null $DOMAIN)
echo "$RESPONSE"
if [ $RESPONSE ==  "200" ]; then
    echo "It is all healthy!"
    exit 0
else
    echo "Something is wrong here!"
    exit 1
fi

# /helm/templates/test/test.yaml
apiVersion: v1
kind: Pod
metadata:
  name: "{{ .Release.Name }}-test"
  annotations:
    "helm.sh/hook": test
spec:
  containers:
    - name: {{ .Release.Name }}-test
      image: {{ .Values.helmtest.repository }}
      imagePullPolicy: Always
      env:
        - name: DOMAIN
          value: http://{{ .Values.svc.name }}/health
  restartPolicy: Never

helm test --namespace myns myhelmrelease
# rollback on failure
helm rollback --namespace myns myhelmrelease

## pip reference:
stages:
- stage: ${{ parameters.environment }}_Apps_Deployments
  variables:
  - group: ${{ parameters.varGroupName }}
  displayName: ${{ parameters.environment }}_Apps_Deployments
  jobs:
  - deployment: ${{ parameters.environment }}_Apps_Deployments
    displayName: ${{ parameters.environment }}_Apps_Deployments
    pool: ${{ parameters.agentPool }}
    environment: ${{ parameters.devopsEnvironment }}
    dependsOn: ${{ parameters.environment }}_SQL_Script
    condition: succeeded()
    strategy:
      runOnce:
        deploy:
          steps:
          - checkout: self
            path: reporting
          - task: Kubernetes@1
            inputs:
              connectionType: 'Kubernetes Service Connection'
              command: 'login'
              versionSpec: ${{ parameters.k8sVersion }}
          - task: Bash@3
            displayName: 'Deploy Apps via helm'
            inputs:
              workingDirectory: "$(Agent.BuildDirectory)/reporting/helm"
              targetType: 'inline'
              script: |
                helm upgrade --install --namespace ${{ parameters.namespace }} \
                  -f values.yaml \
                  -f ${{ parameters.helmValues }} \
                  --set dockerBuildTag=$(Build.SourceBranchName)-$(Build.BuildId) \
                  --timeout 5m --wait \
                  reportingjobserver .
          - task: Bash@3
            displayName: 'Test Helm Chart'
            inputs:
              workingDirectory: "$(Agent.BuildDirectory)/reporting/helm"
              targetType: 'inline'
              script: |
                helm test --namespace ${{ parameters.namespace }} reportingjobserver
        on:
          failure:         
            pool: ${{ parameters.agentPool }}          
            steps:
            - checkout: self
              path: reporting
            - task: Kubernetes@1
              inputs:
                connectionType: 'Kubernetes Service Connection'
                command: 'login'
                versionSpec: ${{ parameters.k8sVersion }}
            - task: Bash@3
              displayName: 'Rollback on failed test'
              inputs:
                workingDirectory: "$(Agent.BuildDirectory)/reporting/helm"
                targetType: 'inline'
                script: |
                  helm rollback --namespace ${{ parameters.namespace }} reportingjobserver