Kernel2Kernel

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=($(kubectl create -f https://raw.githubusercontent.com/networkservicemesh/deployments-k8s/c89573ec0f82ee02c425c43da72b026397cb52fc/examples/features/namespace.yaml)[0])
NAMESPACE=${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}

bases:
- https://github.com/networkservicemesh/deployments-k8s/apps/nsc-kernel?ref=c89573ec0f82ee02c425c43da72b026397cb52fc
- https://github.com/networkservicemesh/deployments-k8s/apps/nse-kernel?ref=c89573ec0f82ee02c425c43da72b026397cb52fc

patchesStrategicMerge:
- patch-nsc.yaml
- patch-nse.yaml
EOF

Create NSC patch:

cat > patch-nsc.yaml <<EOF
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nsc-kernel
spec:
  template:
    spec:
      containers:
        - name: nsc
          env:
            - name: NSM_NETWORK_SERVICES
              value: kernel://icmp-responder/nsm-1
      nodeSelector:
        kubernetes.io/hostname: ${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: 2001:db8::/116
      nodeSelector:
        kubernetes.io/hostname: ${NODE}
EOF

Deploy NSC and NSE:

kubectl apply -k .

Wait for applications ready:

kubectl wait --for=condition=ready --timeout=1m pod -l app=nsc-kernel -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=nsc-kernel -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

Cleanup

Delete ns:

kubectl delete ns ${NAMESPACE}