Capturing Container Traffic on Kubernetes

Capturing Container Traffic on Kubernetes

It’s easy to capture network traffic with a capture tool if we have access to the network interface. But it’s tricky in Kubernetes. Let's learn Capturing Container Traffic on Kubernetes.

It’s easy to capture network traffic with a capture tool (for example: tcpdump) if we have access to the network interface. But it’s tricky in Kubernetes. There are several options, for example: sidecar container, capture plugin, docker container, direct access in same network namespace.

Managed Kubernetes providers hardened security configurations, so depending on our access possibilities and rights to the cluster, the below examples may work (if it’s possible to access the node OS, if container is enabled to run the container as root, etc.). Below examples are tested on a VM-based K8s cluster created for my earlier article Setup On-premise Kubernetes with Kubeadm, MetalLB, Traefik, and Vagrant.

  • Tools
  • Direct access to the K8s node
  • Capturing in the container
  • Sidecar container in same Pod
  • Ephemeral Debug Containers

kubernetes

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