Re-design 'k2s system ssh' and 'k2s system scp' Commands

[jgriegershs]

Problems

• Currently, the k2s system ssh and k2s system scp are tightly coupled to one control-plane (i.e. kubemaster) and a worker node in multi-vm setup. In the near future, K2s will support multiple worker nodes.
• The semantics of e.g. k2s system ssh [m|w] [-- <remote-command>] confuses users.

Solution Proposal

Re-design the aforementioned commands to align with the new k2s node command group, e.g.:

• k2s node connect --ip 172.19.1.100 --> this would create an interactive SSH-based session to the control-plane
• k2s node exec --ip 172.19.1.100 -c "echo 'hello'" --> this would run a batch command on the control-plane using SSH batch execution without interactivity
• k2s node copy --ip 172.19.1.100 --source "c:\temp\my.file" --target "/tmp/" --> this would copy to control-plane using SCP

To display K8s node information, a user can run kgn which results in outputs like:

NAME         STATUS   ROLES           AGE   VERSION   INTERNAL-IP    EXTERNAL-IP   OS-IMAGE                         KERNEL-VERSION          CONTAINER-RUNTIME
kubemaster   Ready    control-plane   19d   v1.29.5   172.19.1.100   <none>        Debian GNU/Linux 11 (bullseye)   5.10.0-32-cloud-amd64   cri-o://1.29.8
pc-12345     Ready    worker          21h   v1.29.5   172.20.1.2     <none>        Windows 10 Enterprise            10.0.19045.4894         containerd://1.7.17

In future implementations, we could add flags like -n kubemaster or -r control-plane as well to determine the target node.

[jgriegershs]

Thinking about the copy command, we might need to continue distinguishing between copying to and from, so we might end up with something like:

• k2s node copy-to --ip 172.19.1.100 --source "c:\temp\my.file" --target "/tmp/"
• k2s node copy-from --ip 172.19.1.100 --source "/tmp/my.file" --target c:\temp\"

What do you think?

[mahenarayan]

@jgriegershs Thank you for writing down the proposal. I agree to the proposal with some comments.

k2s node copy --ip 172.19.1.100 --source "c:\temp\my.file" --target "/tmp/"
k2s node copy --reverse --ip 172.19.1.100 --source "c:\temp\my.file" --target "/tmp/"

Just to be consistent with other tools out there but not a show stopper.

[jgriegershs]

k2s node copy command is already implemented.

The other two commands are described in #854 and #855.