Kernel2Kernel_dual_stack

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:

NAMESPACE=($(kubectl create -f https://raw.githubusercontent.com/networkservicemesh/deployments-k8s/7be52e47e136c606a141b091c740b7a924e53597/examples/features/namespace.yaml)[0])
NAMESPACE=${NAMESPACE:10}

Select node to deploy NSC and NSE:

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:

cat > kustomization.yaml <<EOF
---
apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

namespace: ${NAMESPACE}

resources:
- client.yaml
bases:
- https://github.com/networkservicemesh/deployments-k8s/apps/nse-kernel?ref=7be52e47e136c606a141b091c740b7a924e53597

patchesStrategicMerge:
- patch-nse.yaml
EOF

Create Client:

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:

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:

kubectl apply -k .

Wait for applications ready:

kubectl wait --for=condition=ready --timeout=1m pod -l app=alpine -n ${NAMESPACE}

kubectl wait --for=condition=ready --timeout=1m pod -l app=nse-kernel -n ${NAMESPACE}

Find NSC and NSE pods by labels:

NSC=$(kubectl get pods -l app=alpine -n ${NAMESPACE} --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')

NSE=$(kubectl get pods -l app=nse-kernel -n ${NAMESPACE} --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')

Check connectivity:

kubectl exec ${NSC} -n ${NAMESPACE} -- ping -c 4 2001:db8::

Check connectivity:

kubectl exec ${NSE} -n ${NAMESPACE} -- ping -c 4 2001:db8::1

Ping from NSC to NSE:

kubectl exec ${NSC} -n ${NAMESPACE} -- ping -c 4 172.16.1.100

Ping from NSE to NSC:

kubectl exec ${NSE} -n ${NAMESPACE} -- ping -c 4 172.16.1.101

Cleanup

Delete ns:

kubectl delete ns ${NAMESPACE}