tc-init

Kubernetes init container for throttling bandwidth with tc.

Currently, only egress bandwidth limits work (sending data out of the container).

First things first: don't use this

...if you don't have to!

Kubernetes has annotations that should enable you to accomplish bandwidth limits without any help:

spec:
  annotations:
  - kubernetes.io/egress-bandwidth: 1M
  - kubernetes.io/ingress-bandwidth: 10M

Unfortunately, I've found that many network implementations do not respect these annotations (as of kubernetes 1.8, anyway), so test if these more official annotations work before adopting tc-init.

Using tc-init

Add tc-init to your containers as an initContainer. It will run tc and limit the egress bandwidth to EGRESS_BANDWIDTH. The value is passed to tc, e.g 10mbit for ten megabits per second, or 5mbps for five megabytes per second.

For example:

spec:
  initContainers:
  - name: tc-init
    image: minrk/tc-init
    env:
    - name: EGRESS_BANDWIDTH
      value: 1mbit
    securityContext:
      capabilities:
        add:
        - NET_ADMIN