Easy SSH key authentication
The nice thing about the
ssh-copy-id command is that it will create
~/.ssh on the remote host and ensure all your directory and file permissions are right for connecting. Debugging a non-working SSH key auth is a real pain.
Install using Homebrew under OSX
$ brew install ssh-copy-id
Generate a new SSH key pair
Just hit enter through all the questions:
$ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/Users/mafro/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /Users/mafro/.ssh/id_rsa. Your public key has been saved in /Users/mafro/.ssh/id_rsa.pub. The key fingerprint is: 4a:0f:21:5d:46:f0:cf:d0:6e:f8:eb:99:bd:03:ec:8f firstname.lastname@example.org
Now move the key pair to your local
~/.ssh, naming the key for the destination hostname and your local hostname, so it's easy to figure out which key is which later:
$ mv .ssh/id_rsa .ssh/hungryhippos.$(hostname).pky $ mv .ssh/id_rsa.pub .ssh/hungryhippos.$(hostname).pky.pub
Copy the key to the remote host
$ ssh-copy-id -i ~/.ssh/hungryhippos.lily.pky pi@hungryhippos /usr/local/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed /usr/local/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys pi@hungryhippos's password: Number of key(s) added: 1 Now try logging into the machine, with: "ssh 'pi@hungryhippos'" and check to make sure that only the key(s) you wanted were added.
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