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Transfer public key to each destination host as the transfer user:
Easy key copy:
ssh-copy-id [-i [identity_file]] [user@]machine
Manual steps to copy keys:
> scp ~/.ssh/id_rsa.pub destHost:~ (enter password)
Create an authorized_keys file on each destination host:
> ssh destHost (enter password)
> cat id_rsa.pub >> .ssh/authorized_keys
If the .ssh directory does not exist, create it with 700 privileges (mkdir .ssh; chmod 700 .ssh):
> chmod 700 .ssh/authorized_keys
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