k8s-mesh-checker

This little script checks tcp port for fullmesh connectivity in k8s cluster

workflow:

start centos daemon set with net=host, inside pod start python HTTP server
start centos daemon set with default net and expose it, inside pod start python HTTP server
with 'kubectl exec' check that python HTTP server is accessible for every pod that we started (for 7 node cluster it starts 14 pods, runs 294 checks and takes 5 minutes if all ports are accessible)
send telegram msg if needed
remove daemonsets and services

example usage:

export TELEGRAM_TOKEN=xxx && export TELEGRAM_CHAT=xxx && ./check-network.sh 38743 yes yes