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README.md

Episode 53: Life of a Packet: Services.

YouTube

Headlines

Life of a packet.

Understanding how Cilium does what it does.

Docs

Scenarios: Episode 51:

  • - pod 2 pod same node
  • - pod 2 pod on adjacent node
  • - pod 2 proxy 2 pod on adjacent node

Scenarios: Episode 53:

Tools:

cilium monitor hubble observe hubble relay

pernode.sh

#!/bin/bash

# The purpose of this script is to deploy to each node in the cluster 2 pods. 
# Each pod will have an env var that shows it's zone.

function netpod () {
  kubectl run net${2}-${1} \
     --image overridden  --labels app=net,pod=net${2}-${1},node=${1}  --overrides \
    '{
      "spec":{
        "hostname": "net'${2}-${1}'",
	      "subdomain": "net",
        "nodeName": "'$1'",
        "containers":[{
          "name":"net",
          "image":"mauilion/debug"
        }]
      }
    }'
}

for worker in $(kubectl get nodes -o name | sed s/node.//)
  do
    for i in {1..2}
      do netpod $worker $i
    done
  done

kubectl create service clusterip net --tcp 8080

Observation Points:

  • to-endpoint
  • to-overlay
  • to-proxy