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Local NSE death

This example shows that NSM keeps working after the local NSE death.

NSC and NSE are using the kernel mechanism to connect with each other.

Requires

Make sure that you have completed steps from basic or memory setup.

Run

Deploy NSC and NSE:

kubectl apply -k https://github.com/networkservicemesh/deployments-k8s/examples/heal/local-nse-death/nse-before-death?ref=34e1f2476dbc21097ab0a50348a966fd58b79985

Wait for applications ready:

kubectl wait --for=condition=ready --timeout=1m pod -l app=alpine -n ns-local-nse-death
kubectl wait --for=condition=ready --timeout=1m pod -l app=nse-kernel -n ns-local-nse-death

Ping from NSC to NSE:

kubectl exec pods/alpine -n ns-local-nse-death -- ping -c 4 172.16.1.100 -I 172.16.1.101

Ping from NSE to NSC:

kubectl exec deployments/nse-kernel -n ns-local-nse-death -- ping -c 4 172.16.1.101 -I 172.16.1.100

Stop NSE pod:

kubectl scale deployment nse-kernel -n ns-local-nse-death --replicas=0
kubectl exec pods/alpine -n ns-local-nse-death -- ping -c 4 172.16.1.100 -I 172.16.1.101 2>&1 | egrep "100% packet loss|Network unreachable|can't set multicast source"

Apply patch:

kubectl apply -k https://github.com/networkservicemesh/deployments-k8s/examples/heal/local-nse-death/nse-after-death?ref=34e1f2476dbc21097ab0a50348a966fd58b79985

Restore NSE pod:

kubectl scale deployment nse-kernel -n ns-local-nse-death --replicas=1

Wait for new NSE to start:

kubectl wait --for=condition=ready --timeout=1m pod -l app=nse-kernel -l version=new -n ns-local-nse-death

Find new NSE pod:

NEW_NSE=$(kubectl get pods -l app=nse-kernel -l version=new -n ns-local-nse-death --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')

Ping should pass with newly configured addresses.

Ping from NSC to new NSE:

kubectl exec pods/alpine -n ns-local-nse-death -- ping -c 4 172.16.1.102 -I 172.16.1.103

Ping from new NSE to NSC:

kubectl exec ${NEW_NSE} -n ns-local-nse-death -- ping -c 4 172.16.1.103 -I 172.16.1.102

Cleanup

Delete ns:

kubectl delete ns ns-local-nse-death