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this is in registries.yaml

mirrors:
  <http://docker.io|docker.io>:
    endpoint:
      - "<https://my.localrepo.com:8443>"
configs:
  "<http://my.localrepo.com:8443|my.localrepo.com:8443>":
    tls:
      insecure_skip_verify: true

Depends on where you want the registry used. There's a global system registry setting that will be used for all images (global settings --> settings). Per cluster this can be overridden as well (think that was your screenshot). Not quite sure how rke2 picks those up, or if rancher itself updates that rke2 file

rke2 uses

/etc/rancher/rke2/registries.yaml

I can confirm that when I install rke2 I see the pull requests in registries log file For Rancher, I missed the system-default-registry under Global Settings I will update that with my local registry thank you!