For GCP how to scp file from one node to another node?

Question

On GCP I have a nodepool for our kubernetes cluster and I can ssh to any of the node in the nodepool. However when I tried the scp command on one of the mode to try to copy a file from current node to another node. It says:

Permission denied (publickey).
Lost connection.

This an issue of ssh too. I cannot ssh to another node from the current node.

How to resolve this issue?

Answer 1

If you can ssh to both the GCP nodes here is the step for you to be able to scp from node A to node B.

1. local> SSH to node A
2. nodeA> ssh-keygen -b 4096
3. nodeA> cat ~/.ssh/id_rsa.pub (then copy the public key content)
4. local> SSH to node B
5. nodeB> vi ~/.ssh/authorized_keys (add the copied public key from nodeA as a newline)

Now you can scp from nodeA to nodeB.