[Starlingx-discuss] heads-up, upcoming Kubernetes changes you may need to plan for

Chris Friesen chris.friesen at windriver.com
Wed Oct 19 14:06:44 UTC 2022

Hi all,

We are in the process of adding support for Kubernetes 1.24.4 and there 
is a change that people need to be aware of.

In 1.20 upstream K8s added a new 
"node-role.kubernetes.io/control-plane=" label to identify control-plane 
nodes.  This is in addition to the previous 
"node-role.kubernetes.io/master=" label that already existed.

Until K8s 1.24 there has been a "node-role.kubernetes.io/master=" taint 
on the control-plane node.  In 1.24 this taint is replaced with a 
"node-role.kubernetes.io/control-plane=" taint.

Currently in StarlingX we have reverted this upstream K8s change to buy 
us time to change all of the platform code to be compatible with the new 

If anyone has application pods that run on controller nodes currently, 
there are two recommendations:

 1. For pod nodeSelectors, replace any usage of
    "node-role.kubernetes.io/master=" with
 2. For pod tolerations, for any pod with a toleration of
    "node-role.kubernetes.io/master=", add a new toleration for

The current expectation is that we will be switching to the new 
label/taint for the K8s 1.25 timeframe at the latest, though if things 
go more smoothly than expected it may be possible to complete the switch 
in the current release.

Chris Friesen

Containers TL
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