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feature(Controller): Add first examples
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‎advanced/Controller/README.adoc

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## Controller
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```
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# Start minikube and enable the ingress addon
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minikube start
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minikube addons enable ingress
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# Create a configmap holding the controller shell script:
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kubectl create configmap expose-controller-script --from-file=./expose-controller.sh
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# Create the controller object:
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kubectl create -f expose-controller.yml
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# Create a sample web application with an 'expose' annotation:
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kubectl create -f web-app.yml
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# Check that an ingress has been created
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kubectl get ingress web-app -o yaml
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# Open Ingress route
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open http://$(minikube ip)/mdn
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```

‎advanced/Controller/curl-jq/Dockerfile

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FROM alpine
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RUN apk add --update \
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curl \
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jq \
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&& rm -rf /var/cache/apk/*
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ENTRYPOINT ["curl"]

‎advanced/Controller/expose-controller.sh

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#!/bin/bash
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# Call it with the namespace to monitor
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namespace=${1:-default}
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# API URL setup. Requires an ambassador API proxy running side-by-side
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base=http://localhost:8001
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ns=namespaces/$namespace
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k8s_service_url=$base/api/v1/$ns/services
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k8s_ingress_url=$base/apis/extensions/v1beta1/$ns/ingresses
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# Watch the K8s API on events on service objects
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echo "::: Starting to wait for events"
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curl -N -s -k $k8s_service_url?watch=true | while read event
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do
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# Event type
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type=$(echo $event | jq -r '.type')
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# Annotation "expose" on service
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expose=$(echo $event | jq -r '.object.metadata.annotations.expose?')
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# Firt service port
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port=$(echo $event | jq -r '.object.spec.ports[0]?.port')
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# Service
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service=$(echo $event | jq -r .object.metadata.name)
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echo "::: $type -- $service [$port] expose = $expose"
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# If a new service has been added and when its labeled with "expose", then
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# create an ingress objecgt for it
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if [ $type = "ADDED" ] && [ $expose != 'null' ]; then
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# Check for Ingress with the same name
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http_code=$(curl -s -o /dev/null -w "%{http_code}" $k8s_ingress_url/$service)
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if [ $http_code != 200 ]; then
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echo "::: Creating Ingress backend for service '$service'"
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cat - << EOT | curl -s -H "Content-Type: application/json" -X "POST" -d @- $k8s_ingress_url
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{
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"apiVersion": "extensions/v1beta1",
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"kind": "Ingress",
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"metadata": {
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"name": "$service",
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"namespace": "$namespace"
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},
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"spec": {
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"rules": [{
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"http": {
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"paths": [{
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"backend": {
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"serviceName": "$service",
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"servicePort": $port
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},
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"path": "$expose"
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}]
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}
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}]
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}
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}
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EOT
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echo
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else
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echo "::: Ingress '$service' already exists. Skipping ..."
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fi
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fi
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done

‎advanced/Controller/expose-controller.yml

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# Example Deployment using a config map as input for a template
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# which is processed from an init-container
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---
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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labels:
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project: k8spatterns
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pattern: Controller
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name: expose-controller
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spec:
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replicas: 1
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template:
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metadata:
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labels:
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project: k8spatterns
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pattern: Controller
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spec:
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containers:
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- name: kubeapi-proxy
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image: rhuss/kubeapi-proxy
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- name: expose-controller
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image: rhuss/curl-jq
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command:
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- "sh"
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- "/expose-script/expose-controller.sh"
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volumeMounts:
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- mountPath: "/expose-script"
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name: expose-controller-script
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volumes:
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- name: expose-controller-script
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configMap:
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name: expose-controller-script

‎advanced/Controller/kubeapi-proxy/Dockerfile

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FROM alpine
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ENV KUBECTL_VERSION=v1.8.0
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RUN apk update \
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&& apk add curl \
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&& curl -L -O https://dl.k8s.io/${KUBECTL_VERSION}/kubernetes-client-linux-amd64.tar.gz \
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&& tar zvxf kubernetes-client-linux-amd64.tar.gz kubernetes/client/bin/kubectl \
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&& mv kubernetes/client/bin/kubectl / \
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&& apk del curl \
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&& rm -rf kubernetes \
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&& rm -f kubernetes-client-linux-amd64.tar.gz \
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&& rm -rf /var/cache/apk/*
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ENTRYPOINT [ \
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"/bin/ash", "-c", \
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"/kubectl proxy \
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--server https://$KUBERNETES_SERVICE_HOST:$KUBERNETES_SERVICE_PORT \
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--certificate-authority=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt \
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--token=$(cat /var/run/secrets/kubernetes.io/serviceaccount/token) \
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--accept-paths='^.*' \
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"]

‎advanced/Controller/web-app.yml

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# Example for a HTTP server with a git pulling sidecar
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---
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apiVersion: v1
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kind: List
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items:
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- apiVersion: v1
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kind: Pod
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metadata:
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name: web-app
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labels:
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project: k8spatterns
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pattern: Controller
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app: web-app
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spec:
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containers:
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# Main container is a stock httpd serving from /var/www/html
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- name: app
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image: centos/httpd
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ports:
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- containerPort: 80
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volumeMounts:
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- mountPath: /var/www/html/mdn
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name: git
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# Sidecar poll every 10 minutes a given repository with git
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- name: poll
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image: axeclbr/git
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volumeMounts:
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- mountPath: /var/lib/data
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name: git
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env:
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- name: GIT_REPO
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value: https://github.com/mdn/beginner-html-site-scripted
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command:
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- "sh"
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- "-c"
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- "git clone $(GIT_REPO) . && watch -n 600 git pull"
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workingDir: /var/lib/data
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volumes:
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# The shared directory for holding the files
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- emptyDir: {}
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name: git
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# A service which opens a NodePort is added for your convenience
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# but is not necessarily required for this example:
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- apiVersion: v1
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kind: Service
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metadata:
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labels:
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project: k8spatterns
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pattern: Controller
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app: web-app
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annotations:
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# Annotation indicating that this path should be reachable as
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# ingress route and will be picked up by the ingress controller:
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expose: "/mdn"
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name: web-app
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spec:
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ports:
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- name: http
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port: 8080
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protocol: TCP
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targetPort: 80
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selector:
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app: web-app

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