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I'd recommend running a separate ingress-nginx in any ns you choose to do the sidecar injection. If your tight on resources you can disable rke2-ingress-nginx addon. Just keep in mind that removing the addon will cause your nodes to reconcile and restart rke2-server service.

Can we disable the already deployed addon by some means?Also,I wanted to use the same RKE2 INGRESS CONTROLLER chart. How can I deploy separately in other ns.

You can always modify the rke2 ingress controller chart using https://docs.rke2.io/helm#customizing-packaged-components-with-helmchartconfig