Add example for cri-o

cri-o was used as an example as it is relatively easy to setup a cluster
using that container runtime as compared to others.

examples/cri/cluster-role-binding.yaml

@@ -0,0 +1,16 @@
+# borrowed from https://cloud.weave.works/k8s/scope.yaml?k8s-version=1.10.0
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: weave-scope
+  labels:
+    name: weave-scope
+  namespace: weave
+roleRef:
+  kind: ClusterRole
+  name: weave-scope
+  apiGroup: rbac.authorization.k8s.io
+subjects:
+  - kind: ServiceAccount
+    name: weave-scope
+    namespace: weave

examples/cri/cluster-role.yaml

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+# borrowed from https://cloud.weave.works/k8s/scope.yaml?k8s-version=1.10.0
+# with little modificatios to reduce permissions
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  labels:
+    name: weave-scope
+  name: weave-scope
+  namespace: weave
+rules:
+- apiGroups:
+  - ""
+  resources:
+  - pods
+  - replicationcontrollers
+  - services
+  - nodes
+  verbs:
+  - list
+  - watch
+- apiGroups:
+  - apps
+  resources:
+  - statefulsets
+  verbs:
+  - list
+  - watch
+- apiGroups:
+  - batch
+  resources:
+  - cronjobs
+  - jobs
+  verbs:
+  - list
+  - watch
+- apiGroups:
+  - extensions
+  resources:
+  - daemonsets
+  - deployments
+  - replicasets
+  verbs:
+  - list
+  - watch

examples/cri/deploy.yaml

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+# borrowed from https://cloud.weave.works/k8s/scope.yaml?k8s-version=1.10.0
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: weave-scope-app
+  labels:
+    name: weave-scope-app
+    app: weave-scope
+    weave-cloud-component: scope
+    weave-scope-component: app
+  namespace: weave
+spec:
+  replicas: 1
+  revisionHistoryLimit: 2
+  template:
+    metadata:
+      labels:
+        name: weave-scope-app
+        app: weave-scope
+        weave-cloud-component: scope
+        weave-scope-component: app
+    spec:
+      containers:
+        - name: app
+          args:
+            - '--no-probe'
+          env: []
+          image: weaveworks/scope:1.9.0
+          imagePullPolicy: IfNotPresent
+          ports:
+            - containerPort: 4040
+              protocol: TCP

examples/cri/ds.yaml

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+# borrowed from https://cloud.weave.works/k8s/scope.yaml?k8s-version=1.10.0
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: weave-scope-agent
+  labels:
+    name: weave-scope-agent
+    app: weave-scope
+    weave-cloud-component: scope
+    weave-scope-component: agent
+  namespace: weave
+spec:
+  minReadySeconds: 5
+  template:
+    metadata:
+      labels:
+        name: weave-scope-agent
+        app: weave-scope
+        weave-cloud-component: scope
+        weave-scope-component: agent
+    spec:
+      containers:
+        - name: scope-agent
+          args:
+            - '--no-app'
+            - '--probe.docker=false'
+            - '--probe.kubernetes=true'
+            - '--probe.cri=true'
+            - '--probe.cri.endpoint=unix:///var/run/crio/crio.sock'
+            - 'weave-scope-app.weave.svc.cluster.local:80'
+          env:
+            - name: KUBERNETES_NODENAME
+              valueFrom:
+                fieldRef:
+                  apiVersion: v1
+                  fieldPath: spec.nodeName
+          image: weaveworks/scope:1.9.0
+          imagePullPolicy: IfNotPresent
+          securityContext:
+            privileged: true
+          volumeMounts:
+            - name: crio-socket
+              mountPath: /var/run/crio/crio.sock
+            - name: scope-plugins
+              mountPath: /var/run/scope/plugins
+            - name: sys-kernel-debug
+              mountPath: /sys/kernel/debug
+      dnsPolicy: ClusterFirstWithHostNet
+      hostNetwork: true
+      hostPID: true
+      serviceAccountName: weave-scope
+      tolerations:
+        - effect: NoSchedule
+          operator: Exists
+      volumes:
+        - name: cri-socket
+          hostPath:
+            path: /var/run/crio/crio.sock
+        - name: scope-plugins
+          hostPath:
+            path: /var/run/scope/plugins
+        - name: sys-kernel-debug
+          hostPath:
+            path: /sys/kernel/debug
+  updateStrategy:
+    rollingUpdate:
+      maxUnavailable: 1

examples/cri/ns.yaml

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+# borrowed from https://cloud.weave.works/k8s/scope.yaml?k8s-version=1.10.0
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: weave

examples/cri/sa.yaml

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+# borrowed from https://cloud.weave.works/k8s/scope.yaml?k8s-version=1.10.0
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: weave-scope
+  labels:
+    name: weave-scope
+  namespace: weave

examples/cri/svc.yaml

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+# borrowed from https://cloud.weave.works/k8s/scope.yaml?k8s-version=1.10.0
+apiVersion: v1
+kind: Service
+metadata:
+  name: weave-scope-app
+  labels:
+    name: weave-scope-app
+    app: weave-scope
+    weave-cloud-component: scope
+    weave-scope-component: app
+  namespace: weave
+spec:
+  ports:
+    - name: app
+      port: 80
+      protocol: TCP
+      targetPort: 4040
+  selector:
+    name: weave-scope-app
+    app: weave-scope
+    weave-cloud-component: scope
+    weave-scope-component: app