Add dual stack examples

Signed-off-by: Laszlo Kiraly <laszlo.kiraly@est.tech>

examples/features/README.md

@@ -15,6 +15,8 @@ To run any feature example follow steps for [Basic NSM setup](../basic)
 - [Kernel2Wireguard2Memif IPv6 example](ipv6/Kernel2Wireguard2Memif_ipv6)
 - [Memif2Wireguard2Kernel IPv6 example](ipv6/Memif2Wireguard2Kernel_ipv6)
 - [Memif2Wireguard2Memif IPv6 example](ipv6/Memif2Wireguard2Memif_ipv6)
+- [Kernel2Kernel dual stack example](dual-stack/Kernel2Kernel_dual_stack)
+- [Kernel2Wireguard2Kernel dual stack example](dual-stack/Kernel2Wireguard2Kernel_dual_stack)
 - [Admission webhook](./webhook)
 - [DNS](./dns)
 - [Topology aware scale from zero](./scale-from-zero)

examples/features/dual-stack/.gitignore

@@ -0,0 +1,2 @@
+client.yaml
+

examples/features/dual-stack/Kernel2Kernel_dual_stack/README.md

@@ -0,0 +1,128 @@
+# Test kernel to kernel connection
+
+
+This example shows that NSC and NSE on the one node can find each other by ipv6 addresses.
+
+NSC and NSE are using the `kernel` mechanism to connect to its local forwarder.
+
+## Run
+
+Create test namespace:
+```bash
+NAMESPACE=($(kubectl create -f https://raw.githubusercontent.com/networkservicemesh/deployments-k8s/f6a529e80624810033753dc6c808a7aaaa6918ac/examples/features/namespace.yaml)[0])
+NAMESPACE=${NAMESPACE:10}
+```
+
+Select node to deploy NSC and NSE:
+```bash
+NODE=($(kubectl get nodes -o go-template='{{range .items}}{{ if not .spec.taints  }}{{index .metadata.labels "kubernetes.io/hostname"}} {{end}}{{end}}')[0])
+```
+
+Create customization file:
+```bash
+cat > kustomization.yaml <<EOF
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: ${NAMESPACE}
+
+resources: 
+- client.yaml
+bases:
+- ../../../../apps/nse-kernel
+
+patchesStrategicMerge:
+- patch-nse.yaml
+EOF
+```
+
+Create Client:
+```bash
+cat > client.yaml <<EOF
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: alpine
+  labels:
+    app: alpine    
+  annotations:
+    networkservicemesh.io: kernel://icmp-responder/nsm-1
+spec:
+  containers:
+  - name: alpine
+    image: alpine:3.15.0
+    imagePullPolicy: IfNotPresent
+    stdin: true
+    tty: true
+  nodeName: ${NODE}
+EOF
+```
+Create NSE patch:
+```bash
+cat > patch-nse.yaml <<EOF
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nse-kernel
+spec:
+  template:
+    spec:
+      containers:
+        - name: nse
+          env:
+            - name: NSM_CIDR_PREFIX
+              value: 172.16.1.100/31,2001:db8::/116
+      nodeName: ${NODE}
+EOF
+```
+
+Deploy NSC and NSE:
+```bash
+kubectl apply -k .
+```
+
+Wait for applications ready:
+```bash
+kubectl wait --for=condition=ready --timeout=1m pod -l app=alpine -n ${NAMESPACE}
+```
+```bash
+kubectl wait --for=condition=ready --timeout=1m pod -l app=nse-kernel -n ${NAMESPACE}
+```
+
+Find NSC and NSE pods by labels:
+```bash
+NSC=$(kubectl get pods -l app=alpine -n ${NAMESPACE} --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
+```
+```bash
+NSE=$(kubectl get pods -l app=nse-kernel -n ${NAMESPACE} --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
+```
+
+Check connectivity:
+```bash
+kubectl exec ${NSC} -n ${NAMESPACE} -- ping -c 4 2001:db8::
+```
+
+Check connectivity:
+```bash
+kubectl exec ${NSE} -n ${NAMESPACE} -- ping -c 4 2001:db8::1
+```
+
+Ping from NSC to NSE:
+```bash
+kubectl exec ${NSC} -n ${NAMESPACE} -- ping -c 4 172.16.1.100
+```
+
+Ping from NSE to NSC:
+```bash
+kubectl exec ${NSE} -n ${NAMESPACE} -- ping -c 4 172.16.1.101
+```
+
+## Cleanup
+
+Delete ns:
+```bash
+kubectl delete ns ${NAMESPACE}
+```

examples/features/dual-stack/Kernel2Wireguard2Kernel_dual_stack/README.md

@@ -0,0 +1,131 @@
+# Test kernel to wireguard to kernel connection
+
+This example shows that NSC and NSE on the different nodes could find and work with each other using IPv6.
+
+NSC and NSE are using the `kernel` mechanism to connect to its local forwarder.
+Forwarders are using the `wireguard` mechanism to connect with each other.
+
+## Run
+
+Create test namespace:
+```bash
+NAMESPACE=($(kubectl create -f https://raw.githubusercontent.com/networkservicemesh/deployments-k8s/f6a529e80624810033753dc6c808a7aaaa6918ac/examples/features/namespace.yaml)[0])
+NAMESPACE=${NAMESPACE:10}
+```
+
+Get nodes exclude control-plane:
+```bash
+NODES=($(kubectl get nodes -o go-template='{{range .items}}{{ if not .spec.taints  }}{{index .metadata.labels "kubernetes.io/hostname"}} {{end}}{{end}}'))
+```
+
+Create customization file:
+```bash
+cat > kustomization.yaml <<EOF
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: ${NAMESPACE}
+
+resources: 
+- client.yaml
+bases:
+- ../../../../apps/nse-kernel
+
+patchesStrategicMerge:
+- patch-nse.yaml
+EOF
+```
+
+Create Client:
+```bash
+cat > client.yaml <<EOF
+---
+apiVersion: v1
+kind: Pod
+metadata:
+  name: alpine
+  labels:
+    app: alpine    
+  annotations:
+    networkservicemesh.io: kernel://icmp-responder-ip/nsm-1
+spec:
+  containers:
+  - name: alpine
+    image: alpine:3.15.0
+    imagePullPolicy: IfNotPresent
+    stdin: true
+    tty: true
+  nodeName: ${NODES[0]}
+EOF
+```
+Create NSE patch:
+```bash
+cat > patch-nse.yaml <<EOF
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nse-kernel
+spec:
+  template:
+    spec:
+      containers:
+        - name: nse
+          env:
+            - name: NSM_CIDR_PREFIX
+              value: 172.16.1.100/31,2001:db8::/116
+            - name: NSM_PAYLOAD
+              value: IP
+            - name: NSM_SERVICE_NAMES
+              value: icmp-responder-ip
+      nodeName: ${NODES[1]}
+EOF
+```
+
+Deploy NSC and NSE:
+```bash
+kubectl apply -k .
+```
+
+Wait for applications ready:
+```bash
+kubectl wait --for=condition=ready --timeout=1m pod -l app=alpine -n ${NAMESPACE}
+```
+```bash
+kubectl wait --for=condition=ready --timeout=1m pod -l app=nse-kernel -n ${NAMESPACE}
+```
+
+Find NSC and NSE pods by labels:
+```bash
+NSC=$(kubectl get pods -l app=alpine -n ${NAMESPACE} --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
+```
+```bash
+NSE=$(kubectl get pods -l app=nse-kernel -n ${NAMESPACE} --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
+```
+
+Ping from NSC to NSE:
+```bash
+kubectl exec ${NSC} -n ${NAMESPACE} -- ping -c 4 2001:db8::
+```
+
+Ping from NSE to NSC:
+```bash
+kubectl exec ${NSE} -n ${NAMESPACE} -- ping -c 4 2001:db8::1
+```
+
+Ping from NSC to NSE:
+```bash
+kubectl exec ${NSC} -n ${NAMESPACE} -- ping -c 4 172.16.1.100
+```
+
+Ping from NSE to NSC:
+```bash
+kubectl exec ${NSE} -n ${NAMESPACE} -- ping -c 4 172.16.1.101
+```
+## Cleanup
+
+Delete ns:
+```bash
+kubectl delete ns ${NAMESPACE}
+```