We will perform most configuration tasks from the controlplane node. After the following steps you will be able to use ssh to log into worker nodes from the controlplane prompt.
You can if you prefer log into worker nodes from separate terminal sessions using e.g.
multipass shell node01
Here we create an SSH key pair for the ubuntu user who we are logged in as. We will copy the public key of this pair to both workers to permit us to use password-less SSH (and SCP) to get from controlplane to these other nodes in the context of the ubuntu user which exists on all nodes.
Generate Key Pair on controlplane node
ssh-keygen
Leave all settings to default (just press ENTER at any questions).
Copy the key to the other hosts. For this step please enter ubuntu where a password is requested.
The option -o StrictHostKeyChecking=no tells it not to ask if you want to connect to a previously unknown host. Not best practice in the real world, but speeds things up here.
ssh-copy-id -o StrictHostKeyChecking=no ubuntu@node01
ssh-copy-id -o StrictHostKeyChecking=no ubuntu@node02
For each host, the output should be similar to this. If it is not, then you may have entered an incorrect password. Retry the step.
Number of key(s) added: 1
Now try logging into the machine, with: "ssh 'ubuntu@node01'"
and check to make sure that only the key(s) you wanted were added.
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