Installation airgap k3s with private registry


I want to install K3s in airgap mode. I create a private registry (Harbor) and I download on github the images docker. But I can’t import images on Harbor. What is the process ?

Thank you in advance for your answers,

Best regards,

Now I import the image of k3s on harbor. I create a files registries.yaml with my login/password and test pull image. What change name registry of image because I try to pull on dockerhub?