Add blue-green deployment example (#19)
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Alexander Matyushentsev
GitHub
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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: {}
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