How to change the the default node agent images in kubernetes environment?

for some reason I don’t have internet connection in my cluster ,when I add a new host to a kubernetes environment,rancher will automatically download some default images like rancher/agent、rancher/k8s:v1.2.0-rancher-1…but all I have is a private registry with rancher/agentrancher/k8s:v1.2.0-rancher-1 pre I need to change the default image to and and so on.

is there any way I can do that?