Add helm chart

Copied and modified teh helm chart available in Gardener repo.

chart/Chart.yaml

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+apiVersion: v1
+description: Helm chart for etcd
+name: etcd
+version: 0.1.0

chart/templates/etcd-bootstrap-configmap.yaml

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+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: etcd-bootstrap-{{ .Values.role }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app: etcd
+data:
+  bootstrap.sh: |-
+    #!/bin/sh
+    while true;
+    do
+      wget http://localhost:8080/initialization/status -S -O status;
+      STATUS=`cat status`;
+      case $STATUS in
+      "New")
+            wget http://localhost:8080/initialization/start -S -O - ;;
+      "Progress")
+            sleep 1;
+            continue;;
+      "Failed")
+            continue;;
+      "Successful")
+            exec etcd --config-file /var/etcd/config/etcd.conf.yaml
+            ;;
+      esac;
+    done
+  etcd.conf.yaml: |-
+    # Human-readable name for this member.
+    name: etcd-{{.Values.role}}
+
+    # Path to the data directory.
+    data-dir: /var/etcd/data/new.etcd
+
+    # Number of committed transactions to trigger a snapshot to disk.
+    snapshot-count: 75000
+
+    # Raise alarms when backend size exceeds the given quota. 0 means use the
+    # default quota.
+    quota-backend-bytes: 8589934592
+
+    # List of comma separated URLs to listen on for client traffic.
+    listen-client-urls: {{ if .Values.tls }}https{{ else }}http{{ end }}://0.0.0.0:2379
+
+    # List of this member's client URLs to advertise to the public.
+    # The URLs needed to be a comma-separated list.
+    advertise-client-urls: {{ if .Values.tls }}https{{ else }}http{{ end }}://0.0.0.0:2379
+
+    # Initial cluster token for the etcd cluster during bootstrap.
+    initial-cluster-token: 'new'
+
+    # Initial cluster state ('new' or 'existing').
+    initial-cluster-state: 'new'
+
+{{- if .Values.tls }}
+    client-transport-security:
+      # Path to the client server TLS cert file.
+      cert-file: /var/etcd/ssl/server/tls.crt
+
+      # Path to the client server TLS key file.
+      key-file: /var/etcd/ssl/server/tls.key
+
+      # Enable client cert authentication.
+      client-cert-auth: true
+
+      # Path to the client server TLS trusted CA cert file.
+      trusted-ca-file: /var/etcd/ssl/ca/ca.crt
+{{- end }}

chart/templates/etcd-client-service.yaml

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+apiVersion: v1
+kind: Service
+metadata:
+  name: etcd-{{ .Values.role }}-client
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app: etcd-statefulset
+    role: {{ .Values.role }}
+spec:
+  type: ClusterIP
+  sessionAffinity: None
+  selector:
+    app: etcd-statefulset
+    role: {{ .Values.role }}
+  ports:
+  - name: client
+    protocol: TCP
+    port: 2379
+    targetPort: 2379

chart/templates/etcd-statefulset.yaml

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+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: etcd-{{ .Values.role }}
+  namespace: {{ .Release.Namespace }}
+  labels:
+    app: etcd-statefulset
+    role: {{ .Values.role }}
+spec:
+  updateStrategy:
+    type: RollingUpdate
+  serviceName: etcd-{{.Values.role}}
+  replicas: {{ .Values.replicas }}
+  selector:
+    matchLabels:
+      app: etcd-statefulset
+      role: {{ .Values.role }}
+  template:
+    metadata:
+      annotations:
+        checksum/configmap-etcd-bootstrap: {{ include (print $.Template.BasePath "/etcd-bootstrap-configmap.yaml") . | sha256sum }}
+{{- if .Values.podAnnotations }}
+{{ toYaml .Values.podAnnotations | indent 8 }}
+{{- end }}
+      labels:
+        app: etcd-statefulset
+        role: {{ .Values.role }}
+    spec:
+      containers:
+      - name: etcd
+        image: {{ index .Values.images "etcd" }}
+        imagePullPolicy: IfNotPresent
+        command:
+        - /var/etcd/bin/bootstrap.sh
+        readinessProbe:
+          httpGet:
+            path: /healthz
+            port: 8080
+          initialDelaySeconds: 15
+          periodSeconds: 5
+        livenessProbe:
+          exec:
+            command:
+            - /bin/sh
+            - -ec
+            - ETCDCTL_API=3
+            - etcdctl
+            - --config-file=/var/etcd/config/etcd.conf.yaml
+            - get
+            - foo
+          initialDelaySeconds: 15
+          periodSeconds: 5
+        ports:
+        - containerPort: 2380
+          name: serverport
+          protocol: TCP
+        - containerPort: 2379
+          name: clientport
+          protocol: TCP
+        resources:
+          requests:
+            cpu: 200m
+            memory: 500Mi
+          limits:
+            cpu: 750m
+            memory: 2560Mi
+        volumeMounts:
+        - name: etcd-{{ .Values.role }}
+          mountPath: /var/etcd/data
+        - name: etcd-bootstrap-sh
+          mountPath: /var/etcd/bin/
+        - name: etcd-config-file
+          mountPath: /var/etcd/config/
+{{- if .Values.tls }}
+        - name: ca-etcd
+          mountPath: /var/etcd/ssl/ca
+        - name: etcd-server-tls
+          mountPath: /var/etcd/ssl/server
+        - name: etcd-client-tls
+          mountPath: /var/etcd/ssl/client
+{{- end }}
+      - name: backup-restore
+        command:
+        - etcdbrctl
+        - server
+        - --schedule={{ .Values.backup.schedule }}
+{{- if eq .Values.backup.garbageCollectionPolicy "LimitBased" }}
+        - --max-backups={{ .Values.backup.maxBackups }}
+        - --garbage-collection-policy={{ .Values.gabageCollectionPolicy }}
+{{- end }}
+        - --data-dir=/var/etcd/data/new.etcd
+        - --storage-provider={{ .Values.backup.storageProvider }}
+        - --store-prefix=etcd-{{ .Values.role }}
+{{- if .Values.tls }}
+        - --cert=/var/etcd/ssl/client/tls.crt
+        - --key=/var/etcd/ssl/client/tls.key
+        - --cacert=/var/etcd/ssl/ca/ca.crt
+        - --insecure-transport=false
+        - --insecure-skip-tls-verify=false
+        - --endpoints=https://etcd-{{ .Values.role }}-0:2379
+{{ else }}
+        - --insecure-transport=true
+        - --insecure-skip-tls-verify=true
+        - --endpoints=http://etcd-{{ .Values.role }}-0:2379
+{{- end }}
+        - --etcd-connection-timeout=300
+        - --delta-snapshot-period-seconds=300
+        image: {{ index .Values.images "etcd-backup-restore" }}
+        imagePullPolicy: IfNotPresent
+        ports:
+        - containerPort: 8080
+          name: server
+          protocol: TCP
+        resources:
+          requests:
+            cpu: 100m
+            memory: 128Mi
+          limits:
+            cpu: 300m
+            memory: 1Gi
+        env:
+        - name: STORAGE_CONTAINER
+          value: {{ .Values.backup.storageContainer }}
+{{- if .Values.backup.env }}
+{{ toYaml .Values.backup.env | indent 8 }}
+{{- end }}
+        volumeMounts:
+        - name: etcd-{{ .Values.role }}
+          mountPath: /var/etcd/data
+        - name: etcd-config-file
+          mountPath: /var/etcd/config/
+{{- if .Values.tls }}
+        - name: ca-etcd
+          mountPath: /var/etcd/ssl/ca
+        - name: etcd-client-tls
+          mountPath: /var/etcd/ssl/client
+{{- end }}
+{{- if .Values.backup.volumeMounts }}
+{{ toYaml .Values.backup.volumeMounts | indent 8 }}
+{{- end }}
+      volumes:
+      - name: etcd-bootstrap-sh
+        configMap:
+          name: etcd-bootstrap-{{ .Values.role }}
+          defaultMode: 0744
+          items:
+          - key: bootstrap.sh
+            path: bootstrap.sh
+      - name: etcd-config-file
+        configMap:
+          name: etcd-bootstrap-{{ .Values.role }}
+          defaultMode: 0644
+          items:
+          - key: etcd.conf.yaml
+            path: etcd.conf.yaml
+{{- if .Values.tls }}
+      - name: etcd-server-tls
+        secret:
+          secretName: {{ .Values.tls.serverSecret }}
+      - name: etcd-client-tls
+        secret:
+          secretName: {{ .Values.tls.clientSecret }}
+      - name: ca-etcd
+        secret:
+          secretName: {{ .Values.tls.caSecret }}
+{{- if .Values.backup.storageProvider }}
+      - name: {{ .Values.backup.backupSecret }}
+        secret:
+          secretName: {{ .Values.backup.backupSecret }}
+{{- end }}
+{{- end }}
+  volumeClaimTemplates:
+  - metadata:
+      name: etcd-{{ .Values.role }}
+    spec:
+      accessModes:
+      - "ReadWriteOnce"
+      resources:
+        requests:
+          storage: 10Gi