karmadactl support list images

[liangyuanpeng]

What would you like to be added:

Support command of karmadactl config images list

Why is this needed:

[lonelyCZ]

Hi @liangyuanpeng ，thanks for your contributions, could you share the usage scenario and why to do it?

[liangyuanpeng]

Since the karmadactl init component is serial, I would like to first pull all required container images before deploying to speed up the init process.

[liangyuanpeng]

$ kubeadm config images list
registry.k8s.io/kube-apiserver:v1.30.0
registry.k8s.io/kube-controller-manager:v1.30.0
registry.k8s.io/kube-scheduler:v1.30.0
registry.k8s.io/kube-proxy:v1.30.0
registry.k8s.io/coredns/coredns:v1.11.1
registry.k8s.io/pause:3.9
registry.k8s.io/etcd:3.5.12-0

[liangyuanpeng]

$ kubeadm config images  list --image-repository=registry.k8s.io2
registry.k8s.io2/kube-apiserver:v1.30.0
registry.k8s.io2/kube-controller-manager:v1.30.0
registry.k8s.io2/kube-scheduler:v1.30.0
registry.k8s.io2/kube-proxy:v1.30.0
registry.k8s.io2/coredns:v1.11.1
registry.k8s.io2/pause:3.9
registry.k8s.io2/etcd:3.5.12-0

[tiansuo114]

Hello tutor, I am currently developing the code of this function, and I have encountered some problems and would like to ask your opinion
I observed that in kubeadm,image list is constructed by constructing an InitConfiguration structure, in which all deployment information and image addresses are stored. However, karmada seems to assemble strings through many private methods of CommandInitOption to compose image address information required for deployment I am not sure how to get it. I hope you can give me some suggestions

@liangyuanpeng

[liangyuanpeng]

we decide pause to work for feature of karmadactl image list based on the content of the meeting, #5387

This feature will be reconsidered if it is generally needed.