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SNMP UDP Knative Source

This source receives SNMP traps and converts them into cloudevents to be consumed by Knative. It starts the trap listener on port 8000. If the traps are coming from outside this ContainerSource needs to be exposed via a service.

Knative Eventing uses the label sources.knative.dev/containerSource for the ContainerSource pods and it can be used to create a Nodeport to receive the traps from external trap sources.

Nodeport Example, Target port 30007

cat <<-EOF | kubectl apply -f -
---
apiVersion: v1
kind: Service
metadata:
  name: snmp-service
spec:
  type: NodePort
  selector:
    sources.knative.dev/containerSource: snmp-source
  ports:
    - port: 8000
      protocol: UDP
      targetPort: 8000
      nodePort: 30007
EOF

Test

The source can be tested with snmptrap on Linux.

sudo apt install snmp snmp-mibs-downloader

Sending trap examples:

snmptrap -v 2c -c "Tas" 127.0.0.1:30007 0 1.3.6.1.4.1.2.3 1.3.6.1.6.1.4.1.2.3.1.1.1.1.1 s "This is a Test"

snmptrap -v 2c -c public 127.0.0.1:30007 SNMPv2-MIB::coldStart 1.3.6.1.6.3.1.1.5.1