How it possible to scale out istiod?

1

Can anyone point me to the relevant documentation? Can’t find anything…

2

Istiod is created as a deployment in Kubernetes, so scaling out is done by increasing the number of replicas on the istiod deployment. However, check if you’re hitting the limits – as per docs, a single instance can support 1000 services (assuming you use the sidecar resource and isolate the namespaces). Istio / Performance and Scalability

3

You can modify the IstioOperator config and set an hpaSpec:


spec:
  components:
    pilot:
      enabled: true
      k8s:
        hpaSpec:
          minReplicas: 2
1 Like
4

jlcrow is 100% correct.

You always want to set istiod replicas > 1, in production, for HA… However, do it all your other clusters too (dev/qa & sit), otherwise PodDisruptionBudgets will bite you during your Kubernetes upgrades. Ignore this warning at your own peril.

2 Likes