Add kubernetes helm chart (serverless#448)

contrib/helm/README.md

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+# Event Gateway Helm chart
+
+This chart deploys the Event Gateway with etcd onto a Kubernetes cluster.
+
+## Installation
+
+Make sure you have helm installed on you machine and run `helm init` on your K8s cluster.
+
+From the `event-gateway/contrib/helm` folder:
+
+First, install etcd operator:
+```
+helm install stable/etcd-operator --name ego
+```
+
+Then, install the Event Gateway:
+```
+helm install event-gateway --name eg
+```
+
+Note: to deploy the stack to a namespace other than the default, add `--namespace` option to both `helm install` commands.
+
+To get the Event Gateway load balancer IP:
+```
+kubectl get svc
+```
+
+To delete the Event Gatway and etcd:
+```
+helm delete eg
+helm delete ego
+```
+
+## Configuration
+
+| Parameter                   | Description                                  | Default                    |
+|-----------------------------|----------------------------------------------|----------------------------|
+| `images.repository`         | Event Gateway image                          | `serverless/event-gateway` |
+| `images.tag`                | Event Gateway image tag                      | `0.9.0`                    |
+| `replicaCount`              | Number of containers                         | `3`                        |
+| `service.type`              | Type of Kubernetes service                   | `LoadBalancer`             |
+| `service.config.port`       | Config API port number                       | `4001`                     |
+| `service.events.port`       | Events API port number                       | `4000`                     |
+| `resources.limits.cpu`      | CPU resource limits                          | `200m`                     |
+| `resources.limits.memory`   | Memory resource limits                       | `256Mi`                    |
+| `resources.requests.cpu`    | CPU resource requests                        | `200m`                     |
+| `resources.requests.memory` | Memory resource requests                     | `256Mi`                    |
+| `command`                   | Options to pass to `event-gateway` command   | `[-db-hosts=eg-etcd-cluster-client:2379, -log-level=debug]`|
+| `etcd_cluster_name`         | Name of the etcd cluster. Must be passed to the `-db-host` option as `<etcd-cluster-name>-client`  | `eg-etcd-cluster`|

contrib/helm/event-gateway/.helmignore

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+# Patterns to ignore when building packages.
+# This supports shell glob matching, relative path matching, and
+# negation (prefixed with !). Only one pattern per line.
+.DS_Store
+# Common VCS dirs
+.git/
+.gitignore
+.bzr/
+.bzrignore
+.hg/
+.hgignore
+.svn/
+# Common backup files
+*.swp
+*.bak
+*.tmp
+*~
+# Various IDEs
+.project
+.idea/
+*.tmproj

contrib/helm/event-gateway/Chart.yaml

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+apiVersion: v1
+description: https://github.com/serverless/event-gateway
+name: event-gateway
+version: 0.1.0

contrib/helm/event-gateway/templates/_helpers.tpl

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+{{/* vim: set filetype=mustache: */}}
+{{/*
+Expand the name of the chart.
+*/}}
+{{- define "event-gateway.name" -}}
+{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+
+{{/*
+Create a default fully qualified app name.
+We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
+If release name contains chart name it will be used as a full name.
+*/}}
+{{- define "event-gateway.fullname" -}}
+{{- if .Values.fullnameOverride -}}
+{{- .Values.fullnameOverride | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- if contains $name .Release.Name -}}
+{{- .Release.Name | trunc 63 | trimSuffix "-" -}}
+{{- else -}}
+{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
+{{- end -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Create chart name and version as used by the chart label.
+*/}}
+{{- define "event-gateway.chart" -}}
+{{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
+{{- end -}}

contrib/helm/event-gateway/templates/etcd-cluster.yaml

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+apiVersion: "etcd.database.coreos.com/v1beta2"
+kind: "EtcdCluster"
+metadata:
+  name: {{ .Values.etcd_cluster_name }}
+spec:
+  size: 3
+  version: "3.2.13"

contrib/helm/event-gateway/templates/event-gateway.yaml

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+apiVersion: apps/v1beta2
+kind: Deployment
+metadata:
+  name: {{ template "event-gateway.fullname" . }}
+  labels:
+    app: {{ template "event-gateway.fullname" . }}
+    chart: {{ template "event-gateway.chart" . }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  replicas: {{ .Values.replicaCount }}
+  selector:
+    matchLabels:
+      app: {{ template "event-gateway.name" . }}
+      release: {{ .Release.Name }}
+  template:
+    metadata:
+      labels:
+        app: {{ template "event-gateway.name" . }}
+        release: {{ .Release.Name }}
+    spec:
+      containers:
+        - name: {{ .Chart.Name }}
+          image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
+          imagePullPolicy: {{ .Values.image.pullPolicy }}
+          args:
+            {{- range .Values.command }}
+            - {{ . }}
+            {{- end }}
+          livenessProbe:
+            httpGet:
+              path: /v1/status
+              port: {{ .Values.service.config.port }}
+          readinessProbe:
+            httpGet:
+              path: /v1/status
+              port: {{ .Values.service.config.port }}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: {{ template "event-gateway.fullname" . }}
+  labels:
+    chart: "{{ .Chart.Name }}-{{ .Chart.Version | replace "+" "_" }}"
+spec:
+  type: {{ .Values.service.type }}
+  ports:
+  - name: config
+    port: {{ .Values.service.config.port }}
+  - name: events
+    port: {{ .Values.service.events.port }}
+  selector:
+    app: {{ template "event-gateway.name" . }}

contrib/helm/event-gateway/values.yaml

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+image:
+  repository: serverless/event-gateway
+  tag: 0.9.0
+  pullPolicy: IfNotPresent
+replicaCount: 3
+service:
+  type: LoadBalancer
+  config:
+    port: 4001
+  events:
+    port: 4000
+resources:
+  limits:
+   cpu: 200m
+   memory: 256Mi
+  requests:
+   cpu: 200m
+   memory: 256Mi
+command: ["-db-hosts=eg-etcd-cluster-client:2379", "-log-level=debug"]
+etcd_cluster_name: eg-etcd-cluster