egressd

egressd

Kubernetes aware network traffic monitoring.

How it works

• DaemonSet pod starts on each node.
• Conntrack entries are fetched for pods running on each at configured interval (5 seconds by default).
  • If Cilium is used then conntrack records are fetched from eBPF maps located at host /sys/fs/bpf. These maps are created by Cilium.
  • If Linux Netfilter Conntrack module is used then Netlink is used to get these records.
• Records are reduced by source IP, destination, IP and protocol.
• Kubernetes context is added including source and destination pods, nodes, node zones, ips.
• Exporter can export logs to http or prometheus.

Priviledges

Egressd runs as priviledged container for a few reasons:

1. DNS tracer uses eBPF.
2. Fetch conntrack entries:
   • Bidirectional mount propogation is used to enable netfilter conntrack accounting and mount cgroupv2.
   • If Cilium is used collector reads from ebpf maps which stores data in kernel.

Install

Install demo with preconfigured grafana and prometheus metrics.

curl -fsSL https://raw.githubusercontent.com/castai/egressd/master/demo.sh | bash

Expose grafana locally

 kubectl port-forward svc/egressd-grafana 8080:80 -n egressd

Example dashboard available at http://localhost:8080/d/egressd/egressd Metrics should be visible after few minutes.

(Optionally) Install demo onlineboutique eshop

If you want to test egressd on empty cluster.

helm upgrade --install onlineboutique oci://us-docker.pkg.dev/online-boutique-ci/charts/onlineboutique -n demo --create-namespace

Development

Start all components + test grafana,promtheus in tilt local k8s cluster.

tilt up

Release procedure (with automatic release notes)

Head to the GitHub new release page, create a new tag at the top, and click Generate Release Notes at the middle-right.

Run e2e tests locally

KIND_CONTEXT=tilt IMAGE_TAG=local ./e2e/run.sh