Add test to log level change via signals feature

examples/features/README.md

@@ -36,4 +36,5 @@ To run any feature example follow steps for [Basic NSM setup](../basic)
 - [Scaled Registry K8s](./scaled-registry)
 - [NSC changes endpoints dynamically](./change-nse-dynamically)
 - [NSE IPAM Policies](./ipam-policies)
+- [Runtime LogLevel Change](./runtime-loglevel-change)
 

examples/features/runtime-loglevel-change/README.md

@@ -0,0 +1,67 @@
+# Test runtime log level change via signals
+
+This example shows how log level can be set, and reset to and from TRACE level
+
+## Requires
+
+Make sure that you have completed steps from [basic](../../basic) setup.
+
+
+## Run
+
+Ensure log level is not set to TRACE
+```bash
+kubectl apply -k ../https://github.com/networkservicemesh/deployments-k8s/examples/features/runtime-loglevel-change?ref=a93498171537efbfcfb704c5272519cc771c5ff0
+```
+
+Wait for forwarders to get ready
+```bash
+kubectl rollout status --timeout=3m -n nsm-system daemonset forwarder-vpp
+```
+
+Select a forwarder pod, get the pid of the running forwarder, and send SIGUSR1 to switch on TRACE
+```bash
+forwarder="$(kubectl get pods -n nsm-system --selector=app=forwarder-vpp --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | head -1)"
+kubectl exec "$forwarder"  -n nsm-system -i -- bash <<'EOF'
+  kill -s SIGUSR1 "$(pgrep 'forwarder')"
+EOF
+```
+
+Check if signal has arrived
+```bash
+kubectl logs --selector=app=forwarder-vpp -n nsm-system --tail -1 --since=1m | grep "SetupLevelChangeOnSignal"
+```
+
+Check if there are TRACE logs
+```bash
+sleep 1m
+kubectl logs --selector=app=forwarder-vpp -n nsm-system --tail -1 --since=1m | grep "TRAC"
+```
+
+Select a forwarder pod, get the pid of the running forwarder, and send SIGUSR2 to restore original log level
+```bash
+forwarder="$(kubectl get pods -n nsm-system --selector=app=forwarder-vpp --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}' | head -1)"
+kubectl exec "$forwarder"  -n nsm-system -i -- bash <<'EOF'
+  kill -s SIGUSR2 "$(pgrep 'forwarder')"
+EOF
+```
+
+Check if signal has arrived
+```bash
+kubectl logs --selector=app=forwarder-vpp -n nsm-system --tail -1 --since=1m | grep "SetupLevelChangeOnSignal"
+  ```
+
+Check if there are no TRACE logs
+```bash
+sleep 1m
+! kubectl logs --selector=app=forwarder-vpp -n nsm-system --tail -1 --since=1m | grep "TRAC"
+```
+
+//---------------------------------------------------------------------------//
+## Cleanup
+
+Reset original basic example
+```bash
+kubectl apply -k https://github.com/networkservicemesh/deployments-k8s/examples/basic?ref=a93498171537efbfcfb704c5272519cc771c5ff0
+kubectl rollout status --timeout=3m -n nsm-system daemonset forwarder-vpp
+```

examples/features/runtime-loglevel-change/forwarder-patch.yaml

@@ -0,0 +1,14 @@
+---
+apiVersion: apps/v1
+kind: DaemonSet
+metadata:
+  name: forwarder-vpp
+spec:
+  selector: {}
+  template:
+    spec:
+      containers:
+      - name: forwarder-vpp
+        env:
+        - name: NSM_LOG_LEVEL
+          value: "INFO"

examples/features/runtime-loglevel-change/kustomization.yaml

@@ -0,0 +1,11 @@
+---
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+
+namespace: nsm-system
+
+resources:
+- ../../basic
+
+patches:
+- path: forwarder-patch.yaml