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Debug Me Maybe

You know how ksniff allows to remote tcpdump a pod? Well this project attaches a debugger for Operators using dlv. This is purely an adaptation of the ksniff source code.

Build

make build install

Usage

Attach to pid #1 on the konnectivity-agent-p9ppv pod in the kube-system namespace and redirect the remote debugger port on your local machine (2345/TCP by default):

kubectl dmm -n kube-system konnectivity-agent-p9ppv

Trying to Ctrl+C to shut it all off will only stop the port-forward. If you want to also kill the remote debugger:

oc dmm -n kube-system konnectivity-agent-p9ppv --force-kill

How?

  1. Finds your pod
  2. Uploads dlv (https://github.com/go-delve/delve, a go debugger) onto the pod (in /tmp/dlv by default). Have your pick of upload methods:
    • direct is equivalent to kubectl cp and only works if the pod has tar.
    • stager creates a stager pod, copies the debugger to it, then uses curl from the pod to debug to retrieve the debugger.
  3. Attaches the debugger for a pid on your pod and listens for debug commands on a port (2345/tcp by default)
  4. Locally spawns a port-forward (kubectl port-forward) to expose the remote debugger port onto your local machine