zero/k8s: deployment manifests (#4763)

* zero/k8s: deployment manifests

* convert to statefulset so that it has persistent volume claim

* use standard ports to avoid config customization for k8s

* add XDG_DATA_HOME mapping

k8s/zero/deployment/base.yaml

@@ -0,0 +1,15 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pomerium
+spec:
+  serviceName: "pomerium-proxy"
+  replicas: 1
+  selector:
+    matchLabels:
+      app.kubernetes.io/name: pomerium-zero
+  template:
+    spec:
+      containers:
+        - name: pomerium
+      terminationGracePeriodSeconds: 10

k8s/zero/deployment/env.yaml

@@ -0,0 +1,25 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pomerium
+spec:
+  template:
+    spec:
+      containers:
+        - name: pomerium
+          env:
+            - name: POMERIUM_ZERO_TOKEN
+              valueFrom:
+                secretKeyRef:
+                  name: pomerium
+                  key: pomerium_zero_token
+                  optional: false
+            - name: POMERIUM_NAMESPACE
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: metadata.namespace
+            - name: POD_IP
+              valueFrom:
+                fieldRef:
+                  fieldPath: status.podIP

k8s/zero/deployment/image.yaml

@@ -0,0 +1,12 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pomerium
+spec:
+  replicas: 1
+  template:
+    spec:
+      containers:
+        - name: pomerium
+          image: pomerium/pomerium:main
+          imagePullPolicy: Always

k8s/zero/deployment/kustomization.yaml

@@ -0,0 +1,10 @@
+resources:
+  - base.yaml
+patchesStrategicMerge:
+  - env.yaml
+  - image.yaml
+  - ports.yaml
+  - resources.yaml
+  - no-root.yaml
+  - readonly-root-fs.yaml
+  - volumes.yaml

k8s/zero/deployment/no-root.yaml

@@ -0,0 +1,22 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pomerium
+spec:
+  template:
+    spec:
+      securityContext:
+        fsGroup: 1000
+        runAsNonRoot: true
+        runAsGroup: 1000
+        runAsUser: 1000
+        sysctls:
+          - name: net.ipv4.ip_unprivileged_port_start
+            value: "80"
+      containers:
+        - name: pomerium
+          securityContext:
+            allowPrivilegeEscalation: false
+            capabilities:
+              drop:
+                - ALL

k8s/zero/deployment/ports.yaml

@@ -0,0 +1,19 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pomerium
+spec:
+  template:
+    spec:
+      containers:
+        - name: pomerium
+          ports:
+            - containerPort: 443
+              name: https
+              protocol: TCP
+            - name: http
+              containerPort: 80
+              protocol: TCP
+            - name: metrics
+              containerPort: 9090
+              protocol: TCP

k8s/zero/deployment/readonly-root-fs.yaml

@@ -0,0 +1,11 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pomerium
+spec:
+  template:
+    spec:
+      containers:
+        - name: pomerium
+          securityContext:
+            readOnlyRootFilesystem: true

k8s/zero/deployment/resources.yaml

@@ -0,0 +1,16 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pomerium
+spec:
+  template:
+    spec:
+      containers:
+        - name: pomerium
+          resources:
+            limits:
+              cpu: 5000m
+              memory: 1Gi
+            requests:
+              cpu: 300m
+              memory: 200Mi

k8s/zero/deployment/volumes.yaml

@@ -0,0 +1,34 @@
+apiVersion: apps/v1
+kind: StatefulSet
+metadata:
+  name: pomerium
+spec:
+  template:
+    spec:
+      nodeSelector:
+        kubernetes.io/os: linux
+      containers:
+        - name: pomerium
+          env:
+            - name: TMPDIR
+              value: "/tmp/pomerium"
+            - name: XDG_CACHE_HOME
+              value: "/var/cache"
+            - name: XDG_DATA_HOME
+              value: "/var/cache"
+          volumeMounts:
+            - mountPath: "/tmp/pomerium"
+              name: tmp
+            - mountPath: "/var/cache"
+              name: pomerium-cache
+      volumes:
+        - name: tmp
+          emptyDir: {}
+  volumeClaimTemplates:
+  - metadata:
+      name: pomerium-cache
+    spec:
+      accessModes: [ "ReadWriteOnce" ]
+      resources:
+        requests:
+          storage: 100Mi