Probes

Probes are simple jobs running inside kubernetes cluster measuring SLIs that could not be measured through other means.

Probe Types

Ping Client

This probe exports the probes_in_cluster_network_latency_seconds metric. It implements the Network Latency Scalability SLI

Running locally

go run cmd/main.go --mode=ping-client --metric-bind-address=:8071 --ping-server-address=127.0.0.1:8081 --stderrthreshold=INFO

Ping Server

This probe doesn't export any metrics, it's needed for the Ping Client to work.

Running locally

go run cmd/main.go --mode=ping-server --metric-bind-address=:8070 --ping-server-bind-address=0.0.0.0:8081 --stderrthreshold=INFO

Building and Releasing

1. Increment the TAG in the Makefile.
2. make build
3. Test changes with docker run gcr.io/k8s-testimages/probes:latest -- ...
4. Release with make push

Go Modules

This project uses Go Modules to manage the external dependencies.