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Diff for: ‎.openshiftio/application.yaml

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apiVersion: v1
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kind: Template
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metadata:
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name: launchpad-builder
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annotations:
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description: This template creates a Build Configuration using an S2I builder.
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tags: instant-app
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parameters:
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- name: SUFFIX_NAME
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description: The suffix name for the template objects
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displayName: Suffix name
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value: ''
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- name: RELEASE_VERSION
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description: The release version number of application
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displayName: Release version
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value: 1.0.0
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- name: SOURCE_REPOSITORY_URL
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description: The source URL for the application
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displayName: Source URL
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required: true
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- name: SOURCE_REPOSITORY_REF
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description: The branch name for the application
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displayName: Source Branch
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value: master
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required: true
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- name: GITHUB_WEBHOOK_SECRET
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description: A secret string used to configure the GitHub webhook.
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displayName: GitHub Webhook Secret
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required: true
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from: '[a-zA-Z0-9]{40}'
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generate: expression
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objects:
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- apiVersion: image.openshift.io/v1
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kind: ImageStream
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metadata:
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name: 'golang-health-check${SUFFIX_NAME}'
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labels:
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version: '${RELEASE_VERSION}'
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spec: {}
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- apiVersion: v1
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kind: BuildConfig
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metadata:
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name: 'golang-health-check-s2i${SUFFIX_NAME}'
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labels:
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version: '${RELEASE_VERSION}'
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spec:
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output:
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to:
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kind: ImageStreamTag
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name: 'golang-health-check${SUFFIX_NAME}:${RELEASE_VERSION}'
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postCommit: {}
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resources: {}
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source:
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git:
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uri: '${SOURCE_REPOSITORY_URL}'
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ref: '${SOURCE_REPOSITORY_REF}'
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type: Git
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strategy:
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type: Source
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sourceStrategy:
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from:
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kind: DockerImage
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name: 'centos/go-toolset-7-centos7'
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incremental: true
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triggers:
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- github:
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secret: '${GITHUB_WEBHOOK_SECRET}'
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type: GitHub
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- type: ConfigChange
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status:
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lastVersion: 0
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- apiVersion: v1
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kind: Service
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spec:
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ports:
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- protocol: TCP
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port: 8080
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targetPort: 8080
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type: ClusterIP
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selector:
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project: golang-health-check
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provider: golang-starters
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metadata:
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name: 'golang-health-check${SUFFIX_NAME}'
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labels:
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provider: golang-starters
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expose: 'true'
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project: golang-health-check
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version: '${RELEASE_VERSION}'
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- apiVersion: v1
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kind: DeploymentConfig
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metadata:
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name: 'golang-health-check${SUFFIX_NAME}'
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labels:
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app: golang-health-check
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provider: golang-starters
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project: golang-health-check
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version: '${RELEASE_VERSION}'
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spec:
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template:
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spec:
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containers:
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- readinessProbe:
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httpGet:
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path: /api/health
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port: 8080
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scheme: HTTP
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failureThreshold: 3
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initialDelaySeconds: 10
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periodSeconds: 5
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successThreshold: 1
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timeoutSeconds: 1
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livenessProbe:
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httpGet:
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path: /api/health
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port: 8080
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scheme: HTTP
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failureThreshold: 2
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initialDelaySeconds: 60
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periodSeconds: 3
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successThreshold: 1
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timeoutSeconds: 1
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image: ''
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name: golang-health-check
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securityContext:
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privileged: false
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ports:
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- containerPort: 8080
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name: http
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protocol: TCP
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metadata:
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labels:
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app: golang-health-check
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project: golang-health-check
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provider: golang-starters
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version: '${RELEASE_VERSION}'
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replicas: 1
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selector:
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app: golang-health-check
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project: golang-health-check
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provider: golang-starters
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triggers:
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- type: ConfigChange
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- type: ImageChange
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imageChangeParams:
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automatic: true
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containerNames:
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- golang-health-check
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from:
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kind: ImageStreamTag
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name: 'golang-health-check${SUFFIX_NAME}:${RELEASE_VERSION}'
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- apiVersion: v1
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kind: Route
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metadata:
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labels:
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project: golang-health-check
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provider: golang-starters
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version: '${RELEASE_VERSION}'
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name: 'golang-health-check${SUFFIX_NAME}'
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spec:
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port:
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targetPort: 8080
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to:
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kind: Service
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name: 'golang-health-check${SUFFIX_NAME}'

Diff for: ‎main.go

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package main
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import (
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"fmt"
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"log"
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"net/http"
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)
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var isOnline = true
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func main() {
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http.HandleFunc("/api/greeting", greeting)
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http.HandleFunc("/api/stop", stop)
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http.HandleFunc("/api/health", health)
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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http.ServeFile(w, r, "public/index.html")
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})
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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func greeting(w http.ResponseWriter, r *http.Request) {
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if isOnline {
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message := "World"
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if m := r.FormValue("name"); m != "" {
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message = m
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}
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fmt.Fprintf(w, "Hello %s!", message)
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return
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}
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w.WriteHeader(503)
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w.Write([]byte("Not Online"))
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}
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func stop(w http.ResponseWriter, r *http.Request) {
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isOnline = false
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w.Write([]byte("Stopping HTTP Server"))
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}
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func health(w http.ResponseWriter, r *http.Request) {
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if isOnline {
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w.WriteHeader(200)
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return
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}
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w.WriteHeader(500)
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}

Diff for: ‎public/index.html

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<html>
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<head>
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<meta charset="utf-8">
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<title>Health Check Mission - Golang</title>
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u"
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crossorigin="anonymous">
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</head>
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<body>
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<div class="container">
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<div>
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<div class="sect1">
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<h2 id="_health_check_booster">Health Check Booster</h2>
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<div class="sectionbody">
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<div class="paragraph">
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<p>Demonstrates how the Kubernetes/Openshift health checks work to determine if a container is still alive (the <em>liveness</em>
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of the container) and ready to serve the traffic for the HTTP endpoints of the application (the <em>readiness</em>
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of the container).</p>
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</div>
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<div class="paragraph">
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<p>To demonstrate this behavior, the application configures a <code>/health</code> HTTP endpoint, which is
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used
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by Kubernetes/Openshift to issue HTTP requests. If the container is still alive—​which means the Health HTTP
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endpoint
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is able to reply—​the management platform will receive HTTP code 200 as a response, and no further action
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is taken. After you click the
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<code>Stop Service</code> button, the HTTP endpoint starts
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returning a 500 response, and the platform then
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restarts
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the pod with the failed container. While the pod is down, the booster UI polls the service
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periodically
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until the pod is restarted. In the meantime, do <strong>not</strong> refresh the page because it will
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not be served until the pod finishes restarting.</p>
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</div>
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<div class="sect2">
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<h3 id="_using_the_greeting_service">Using the greeting service</h3>
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</div>
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</div>
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</div>
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<form class="form-inline">
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<div class="form-group">
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<label for="name">Name</label>
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<input type="text" class="form-control" id="name" placeholder="World">
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</div>
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<button id="invoke" type="submit" class="btn btn-success">Invoke</button>
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<button id="stop" type="submit" class="btn btn-danger">Stop Service</button>
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</form>
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<h3>Result:</h3>
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<pre><code id="greeting-result">Invoke the service to see the result.</code></pre>
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</div>
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</div>
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa"
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crossorigin="anonymous"></script>
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<script>
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var stopTime;
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var attempts;
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function invokeService() {
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var n = $("#name").val() || "World";
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$.get("/api/greeting?name=" + n, function (res) {
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$("#greeting-result").html(res);
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});
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}
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function invokeServiceandRetryUponFailures() {
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var n = $("#name").val() || "World";
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$.get("/api/greeting?name=" + n, function (res) {
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var rebirth = new Date();
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var diff = (stopTime.getTime() - rebirth.getTime()) / 1000;
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var abs = Math.abs(diff);
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$("#greeting-result").html(res + " (the recovery took " + abs + " seconds)");
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})
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.fail(function () {
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$("#greeting-result").html("[" + ++attempts + "] Service not available... Retrying in 2 seconds");
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setTimeout(invokeServiceandRetryUponFailures, 2000);
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});
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}
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$(document).ready(function () {
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$("#invoke").click(function (e) {
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invokeService();
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e.preventDefault();
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});
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$("#stop").click(function (e) {
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$.get("/api/stop", function (data) {
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$("#greeting-result").html("The application has been stopped...");
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stopTime = new Date();
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attempts = 0;
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setTimeout(invokeServiceandRetryUponFailures, 2000);
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});
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e.preventDefault();
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});
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});
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</script>
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</body>
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</html>

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