how to work with insecure registries? With docker desktop I used to follow this approach - https://www.devopsschool.com/blog/setup-docker-service-to-use-insecurehttp-registry-instead-of-https/

If you mean rancher/rke2: https://docs.rke2.io/install/containerd_registry_configuration

Hi I am using rancher desktop, and question is related to docker login

It's the same I guess ...

/etc/rancher/k3s/registries.yaml

And the same format as in the previously linked documentation.