add helm chart example

helm/Chart.yaml

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+name: ovpn-admin
+version: 1.0.0

helm/README.md

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+helm chart example

helm/templates/configmap.yaml

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+{{ $openvpnNetwork := required "A valid .Values.openvpn.subnet entry required!" .Values.openvpn.subnet }}
+{{ $openvpnNetworkAddress := index (splitList "/" $openvpnNetwork) 0 }}
+{{ $openvpnNetworkNetmask := index (splitList "/" $openvpnNetwork) 1 }}
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: openvpn
+data:
+  openvpn.conf: |-
+    user nobody
+    group nogroup
+
+    mode server
+    tls-server
+    # dev-type tun
+    dev tun
+    proto tcp-server
+    port 1194
+    # local 127.0.0.1
+    management 127.0.0.1 8989
+
+    tun-mtu 1500
+    mssfix
+    # only udp
+    #fragment 1300
+
+    keepalive 10 60
+    client-to-client
+    persist-key
+    persist-tun
+
+    cipher AES-128-CBC
+    duplicate-cn
+
+    server {{ $openvpnNetworkAddress }} {{ $openvpnNetworkNetmask }}
+
+    topology subnet
+    push "topology subnet"
+    push "route-metric 9999"
+
+    verb 4
+
+    ifconfig-pool-persist /tmp/openvpn.ipp
+    status /tmp/openvpn.status
+
+    key-direction 0
+
+    ca /etc/openvpn/certs/pki/ca.crt
+    key /etc/openvpn/certs/pki/private/server.key
+    cert /etc/openvpn/certs/pki/issued/server.crt
+    dh /etc/openvpn/certs/pki/dh.pem
+    crl-verify /etc/openvpn/certs/pki/crl.pem
+    tls-auth /etc/openvpn/certs/pki/ta.key
+    client-config-dir /etc/openvpn/ccd
+
+  entrypoint.sh: |-
+    #!/bin/sh
+    set -x
+
+    iptables -t nat -A POSTROUTING -s {{ $openvpnNetworkAddress }}/{{ $openvpnNetworkNetmask }} ! -d {{ $openvpnNetworkAddress }}/{{ $openvpnNetworkNetmask }} -j MASQUERADE
+
+    mkdir -p /dev/net
+    if [ ! -c /dev/net/tun ]; then
+        mknod /dev/net/tun c 10 200
+    fi
+
+    wait_file() {
+      file_path="$1"
+      while true; do
+        if [ -f $file_path ]; then
+          break
+        fi
+        echo "wait $file_path"
+        sleep 2
+      done
+    }
+
+    easyrsa_path="/etc/openvpn/certs"
+
+    wait_file "$easyrsa_path/pki/ca.crt"
+    wait_file "$easyrsa_path/pki/private/server.key"
+    wait_file "$easyrsa_path/pki/issued/server.crt"
+    wait_file "$easyrsa_path/pki/ta.key"
+    wait_file "$easyrsa_path/pki/dh.pem"
+    wait_file "$easyrsa_path/pki/crl.pem"
+
+    openvpn --config /etc/openvpn/openvpn.conf

helm/templates/deployment.yaml

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+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: openvpn
+spec:
+  selector:
+    matchLabels:
+      app: openvpn
+  template:
+    metadata:
+      labels:
+        app: openvpn
+    spec:
+      {{- if .Values.openvpn.nodeSelector }}
+      nodeSelector:
+      {{- .Values.openvpn.nodeSelector | toYaml | indent 8 | printf "\n%s" }}
+      {{- end }}
+      {{- if .Values.openvpn.tolerations }}
+      tolerations:
+      {{- .Values.openvpn.tolerations | toYaml | indent 8 | printf "\n%s" }}
+      {{- end }}
+      terminationGracePeriodSeconds: 0
+      serviceAccountName: openvpn
+      containers:
+      - name: ovpn-admin
+        image: {{ .Values.ovpnAdmin.image }}
+        command:
+        - /bin/sh
+        - -c
+        - /app/ovpn-admin
+            --storage.backend="kubernetes.secrets"
+            --listen.host="0.0.0.0"
+            --listen.port="8000"
+            --role="master"
+            {{- if hasKey .Values.openvpn "inlet" }}
+              {{- if eq .Values.openvpn.inlet "LoadBalancer" }}
+            --ovpn.server.behindLB
+            --ovpn.service="openvpn-external"
+              {{- end }}
+            {{- end }}
+            --mgmt=main="127.0.0.1:8989"
+            --ccd --ccd.path="/mnt/ccd"
+            --easyrsa.path="/mnt/certs"
+            {{- $externalHost := "" }}
+            {{- if hasKey .Values.openvpn "inlet" }}
+              {{- if eq .Values.openvpn.inlet "ExternalIP" }}{{ $externalHost = .Values.openvpn.externalIP }}{{- end }}
+            {{- end }}
+            {{- if hasKey .Values.openvpn "externalHost" }}{{ $externalHost = .Values.openvpn.externalHost }}{{- end }}
+            {{- if ne $externalHost "" }}
+            --ovpn.server="{{ $externalHost }}:{{ .Values.openvpn.externalPort | default 5416 | quote }}:tcp"
+            {{- end }}
+        ports:
+        - name: ovpn-admin
+          protocol: TCP
+          containerPort: 8000
+        volumeMounts:
+          - name: certs
+            mountPath: /mnt/certs
+          - name: ccd
+            mountPath: /mnt/ccd
+      - name: openvpn
+        image: {{ .Values.openvpn.image }}
+        command: [ '/entrypoint.sh' ]
+        # imagePullPolicy: Always
+        securityContext:
+          allowPrivilegeEscalation: false
+          capabilities:
+            add:
+            - NET_ADMIN
+            - NET_RAW
+            - MKNOD
+            - SETGID
+            - SETUID
+            drop:
+            - ALL
+        ports:
+        - name: openvpn-tcp
+          protocol: TCP
+          containerPort: 1194
+          {{- if eq .Values.openvpn.inlet "HostPort" }}
+          hostPort: {{ .Values.openvpn.hostPort }}
+          {{- end }}
+        volumeMounts:
+        - name: tmp
+          mountPath: /tmp
+        - name: dev-net
+          mountPath: /dev/net
+        - name: certs
+          mountPath: /etc/openvpn/certs
+        - name: ccd
+          mountPath: /etc/openvpn/ccd
+        - name: config
+          mountPath: /etc/openvpn/openvpn.conf
+          subPath: openvpn.conf
+          readOnly: true
+        - name: entrypoint
+          mountPath: /entrypoint.sh
+          subPath: entrypoint.sh
+          readOnly: true
+      volumes:
+      - name: tmp
+        emptyDir: {}
+      - name: dev-net
+        emptyDir: {}
+      - name: certs
+        emptyDir: {}
+      - name: ccd
+        emptyDir: {}
+      - name: config
+        configMap:
+          name: openvpn
+          defaultMode: 0644
+      - name: entrypoint
+        configMap:
+          name: openvpn
+          defaultMode: 0755

helm/templates/ingress.yaml

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+---
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: ovpn-admin
+  annotations:
+    kubernetes.io/ingress.class: nginx
+    nginx.ingress.kubernetes.io/backend-protocol: HTTP
+    nginx.ingress.kubernetes.io/auth-type: basic
+    nginx.ingress.kubernetes.io/auth-realm: "Authentication Required"
+    nginx.ingress.kubernetes.io/auth-secret: basic-auth
+spec:
+  tls:
+  - hosts:
+    - {{ .Values.domain }}
+    secretName: ingress-tls
+  rules:
+  - host: {{ .Values.domain }}
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: ovpn-admin
+            port:
+              name: http
+---
+apiVersion: cert-manager.io/v1
+kind: Certificate
+metadata:
+  name: ovpn-admin
+spec:
+  secretName: ingress-tls
+  dnsNames:
+  - {{ .Values.domain }}
+  issuerRef:
+    name: letsencrypt
+    kind: ClusterIssuer

helm/templates/rbac.yaml

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+---
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: openvpn
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: openvpn
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - services
+  verbs:
+  - get
+  - list
+- apiGroups:
+  - ""
+  resources:
+  - secrets
+  verbs:
+  - "*"
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: openvpn
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: openvpn
+subjects:
+- kind: ServiceAccount
+  name: openvpn

helm/templates/secret.yaml

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+---
+apiVersion: v1
+kind: Secret
+metadata:
+  name: basic-auth
+type: Opaque
+data:
+  auth: {{ print .Values.ovpnAdmin.basicAuth.user ":{PLAIN}" .Values.ovpnAdmin.basicAuth.password | b64enc | quote }}

helm/templates/service.yaml

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+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: ovpn-admin
+spec:
+  clusterIP: None
+  ports:
+  - name: http
+    port: 8000
+    protocol: TCP
+    targetPort: 8000
+  selector:
+    app: openvpn
+---
+{{- if hasKey .Values.openvpn "inlet" }}
+
+  {{- if eq .Values.openvpn.inlet "LoadBalancer" }}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: openvpn-external
+spec:
+  externalTrafficPolicy: Local
+  type: LoadBalancer
+  ports:
+    - name: openvpn-tcp
+      protocol: TCP
+      port: {{ .Values.openvpn.externalPort | default 1194 }}
+      targetPort: openvpn-tcp
+  selector:
+    app: openvpn
+  {{- else if eq .Values.openvpn.inlet "ExternalIP" }}
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: openvpn-external
+spec:
+  type: ClusterIP
+  externalIPs:
+  - {{ .Values.openvpn.externalIP }}
+  ports:
+  - name: openvpn-tcp
+    port: {{ .Values.openvpn.externalPort | default 1194 }}
+    protocol: TCP
+    targetPort: openvpn-tcp
+  selector:
+    app: openvpn
+  {{- else if eq .Values.openvpn.inlet "HostPort" }}
+---
+  {{- else }}
+    {{- cat "Unsupported inlet type" .inlet | fail }}
+  {{- end }}
+
+{{- end }}

helm/values.yaml

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+domain: changeme
+ovpnAdmin:
+  image: changeme
+  basicAuth:
+    user: admin
+    password: changeme
+openvpn:
+  image: changeme
+  subnet: 172.16.200.0/255.255.255.0
+  # nodeSelector:
+  #   node-role.kubernetes.io/master: ""
+  # tolerations:
+  # - effect: NoSchedule
+  #   key: node-role.kubernetes.io/master
+  #
+  # // LoadBalancer or ExternalIP or HostPort
+  inlet: HostPort
+  #
+  # If inlet: ExternalIP
+  # externalIP: 1.2.3.4
+  # externalPort: 1194
+  #
+  # If inlet: HostPort
+  hostPort: 1194
+  # Domain or ip for connect to OpenVPN server
+  # externalHost: 1.2.3.4