Alexander Matyushentsev
6 years ago
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blue-green/.helmignore
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blue-green/Chart.yaml
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blue-green/README.md
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blue-green/templates/NOTES.txt
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blue-green/templates/_helpers.tpl
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blue-green/templates/rollout.yaml
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blue-green/templates/services.yaml
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blue-green/values.yaml
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guestbook/README.md
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# Patterns to ignore when building packages. |
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# This supports shell glob matching, relative path matching, and |
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# negation (prefixed with !). Only one pattern per line. |
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.DS_Store |
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# Common VCS dirs |
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.git/ |
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.gitignore |
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.bzr/ |
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.bzrignore |
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.hg/ |
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.hgignore |
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.svn/ |
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# Common backup files |
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*.swp |
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*.bak |
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*.tmp |
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*~ |
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# Various IDEs |
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.project |
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.idea/ |
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*.tmproj |
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apiVersion: v1 |
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appVersion: "1.0" |
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description: A Helm chart for Kubernetes |
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name: helm-guestbook |
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version: 0.1.0 |
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# Blue Green |
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The blue green strategy is not supported by built-in Kubernetes Deployment but available via third-party Kubernetes controller. |
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This example demonstrates how to implement blue-green deployment via [Argo Rollouts](https://github.com/argoproj/argo-rollouts): |
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1. Install Argo Rollouts controller: https://github.com/argoproj/argo-rollouts#installation |
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2. Create a sample application and sync it. |
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``` |
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argocd app create --name blue-green --repo https://github.com/argoproj/argocd-example-apps --dest-server https://kubernetes.default.svc --dest-namespace default --path blue-green && argocd app sync blue-green |
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``` |
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Once the application is synced you can access it using `blue-green-helm-guestbook` service. |
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3. Change image version parameter to trigger blue-green deployment process: |
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``` |
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argocd app set blue-green -p image.tag=0.2 && argocd app sync blue-green |
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``` |
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Now application runs `ks-guestbook-demo:0.1` and `ks-guestbook-demo:0.2` images simultaneously. |
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The `ks-guestbook-demo:0.2` is still considered `blue` available only via preview service `blue-green-helm-guestbook-preview`. |
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4. Promote `ks-guestbook-demo:0.2` to `green` by patching `Rollout` resource: |
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``` |
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argocd app patch-resource blue-green --kind Rollout --resource-name blue-green-helm-guestbook --patch '{ "spec": { "paused": false } }' --patch-type 'application/merge-patch+json' |
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``` |
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This promotes `ks-guestbook-demo:0.2` to `green` status and `Rollout` deletes old replica which runs `ks-guestbook-demo:0.1`. |
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1. Get the application URL by running these commands: |
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{{- if .Values.ingress.enabled }} |
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{{- range .Values.ingress.hosts }} |
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http{{ if $.Values.ingress.tls }}s{{ end }}://{{ . }}{{ $.Values.ingress.path }} |
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{{- end }} |
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{{- else if contains "NodePort" .Values.service.type }} |
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export NODE_PORT=$(kubectl get --namespace {{ .Release.Namespace }} -o jsonpath="{.spec.ports[0].nodePort}" services {{ template "helm-guestbook.fullname" . }}) |
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export NODE_IP=$(kubectl get nodes --namespace {{ .Release.Namespace }} -o jsonpath="{.items[0].status.addresses[0].address}") |
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echo http://$NODE_IP:$NODE_PORT |
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{{- else if contains "LoadBalancer" .Values.service.type }} |
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NOTE: It may take a few minutes for the LoadBalancer IP to be available. |
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You can watch the status of by running 'kubectl get svc -w {{ template "helm-guestbook.fullname" . }}' |
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export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ template "helm-guestbook.fullname" . }} -o jsonpath='{.status.loadBalancer.ingress[0].ip}') |
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echo http://$SERVICE_IP:{{ .Values.service.port }} |
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{{- else if contains "ClusterIP" .Values.service.type }} |
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export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app={{ template "helm-guestbook.name" . }},release={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}") |
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echo "Visit http://127.0.0.1:8080 to use your application" |
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kubectl port-forward $POD_NAME 8080:80 |
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{{- end }} |
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{{/* vim: set filetype=mustache: */}} |
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{{/* |
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Expand the name of the chart. |
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*/}} |
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{{- define "helm-guestbook.name" -}} |
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{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}} |
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{{- end -}} |
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{{/* |
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Create a default fully qualified app name. |
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We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec). |
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If release name contains chart name it will be used as a full name. |
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*/}} |
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{{- define "helm-guestbook.fullname" -}} |
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{{- if .Values.fullnameOverride -}} |
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{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}} |
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{{- else -}} |
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{{- $name := default .Chart.Name .Values.nameOverride -}} |
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{{- if contains $name .Release.Name -}} |
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{{- .Release.Name | trunc 63 | trimSuffix "-" -}} |
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{{- else -}} |
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{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}} |
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{{- end -}} |
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{{- end -}} |
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{{- end -}} |
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{{/* |
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Create chart name and version as used by the chart label. |
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*/}} |
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{{- define "helm-guestbook.chart" -}} |
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{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}} |
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{{- end -}} |
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apiVersion: argoproj.io/v1alpha1 |
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kind: Rollout |
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metadata: |
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name: {{ template "helm-guestbook.fullname" . }} |
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labels: |
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app: {{ template "helm-guestbook.name" . }} |
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chart: {{ template "helm-guestbook.chart" . }} |
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release: {{ .Release.Name }} |
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heritage: {{ .Release.Service }} |
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spec: |
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replicas: {{ .Values.replicaCount }} |
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revisionHistoryLimit: 3 |
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selector: |
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matchLabels: |
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app: {{ template "helm-guestbook.name" . }} |
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release: {{ .Release.Name }} |
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strategy: |
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blueGreen: |
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activeService: {{ template "helm-guestbook.fullname" . }} |
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previewService: {{ template "helm-guestbook.fullname" . }}-preview |
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template: |
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metadata: |
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labels: |
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app: {{ template "helm-guestbook.name" . }} |
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release: {{ .Release.Name }} |
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spec: |
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containers: |
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- name: {{ .Chart.Name }} |
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image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}" |
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imagePullPolicy: {{ .Values.image.pullPolicy }} |
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ports: |
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- name: http |
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containerPort: 80 |
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protocol: TCP |
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livenessProbe: |
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httpGet: |
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path: / |
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port: http |
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readinessProbe: |
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httpGet: |
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path: / |
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port: http |
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resources: |
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{{ toYaml .Values.resources | indent 12 }} |
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{{- with .Values.nodeSelector }} |
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nodeSelector: |
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{{ toYaml . | indent 8 }} |
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{{- end }} |
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{{- with .Values.affinity }} |
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affinity: |
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{{ toYaml . | indent 8 }} |
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{{- end }} |
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{{- with .Values.tolerations }} |
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tolerations: |
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{{ toYaml . | indent 8 }} |
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{{- end }} |
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--- |
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apiVersion: v1 |
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kind: Service |
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metadata: |
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name: {{ template "helm-guestbook.fullname" . }} |
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labels: |
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app: {{ template "helm-guestbook.name" . }} |
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chart: {{ template "helm-guestbook.chart" . }} |
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release: {{ .Release.Name }} |
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heritage: {{ .Release.Service }} |
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spec: |
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type: {{ .Values.service.type }} |
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ports: |
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- port: {{ .Values.service.port }} |
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targetPort: http |
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protocol: TCP |
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name: http |
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selector: |
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app: {{ template "helm-guestbook.name" . }} |
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release: {{ .Release.Name }} |
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--- |
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apiVersion: v1 |
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kind: Service |
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metadata: |
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name: {{ template "helm-guestbook.fullname" . }}-preview |
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labels: |
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app: {{ template "helm-guestbook.name" . }} |
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chart: {{ template "helm-guestbook.chart" . }} |
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release: {{ .Release.Name }} |
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heritage: {{ .Release.Service }} |
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spec: |
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type: {{ .Values.service.type }} |
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ports: |
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- port: {{ .Values.service.port }} |
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targetPort: http |
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protocol: TCP |
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name: http |
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selector: |
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app: {{ template "helm-guestbook.name" . }} |
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release: {{ .Release.Name }} |
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# Default values for helm-guestbook. |
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# This is a YAML-formatted file. |
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# Declare variables to be passed into your templates. |
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replicaCount: 1 |
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image: |
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repository: gcr.io/heptio-images/ks-guestbook-demo |
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tag: 0.1 |
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pullPolicy: IfNotPresent |
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service: |
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type: ClusterIP |
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port: 80 |
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ingress: |
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enabled: false |
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annotations: {} |
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# kubernetes.io/ingress.class: nginx |
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# kubernetes.io/tls-acme: "true" |
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path: / |
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hosts: |
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- chart-example.local |
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tls: [] |
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# - secretName: chart-example-tls |
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# hosts: |
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# - chart-example.local |
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resources: {} |
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# We usually recommend not to specify default resources and to leave this as a conscious |
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# choice for the user. This also increases chances charts run on environments with little |
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# resources, such as Minikube. If you do want to specify resources, uncomment the following |
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# lines, adjust them as necessary, and remove the curly braces after 'resources:'. |
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# limits: |
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# cpu: 100m |
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# memory: 128Mi |
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# requests: |
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# cpu: 100m |
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# memory: 128Mi |
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nodeSelector: {} |
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tolerations: [] |
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affinity: {} |