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Currently cloud-init writes something like this to console output:
ec2: #############################################################
ec2: -----BEGIN SSH HOST KEY FINGERPRINTS-----
ec2: 2048 78:ae:f3:91:04:6f:8d:ee:ef:e1:2d:72:83:6a:d0:82 root@h (RSA)
ec2: 1024 d3:b6:32:64:22:d4:43:05:f9:25:b4:f3:65:4e:e2:51 root@h (DSA)
ec2: -----END SSH HOST KEY FINGERPRINTS-----
ec2: #############################################################
the key fingerprints are useful for humans to read, but not so useful
for machines, as you cannot populate a KnownHostsFile (~/.ssh/known_hosts)
from the data there.
This change adds output like:
-----BEGIN SSH HOST KEY KEYS-----
ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdH......STI= root@h
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDYRIQe6m......tWF3 root@h
-----END SSH HOST KEY KEYS-----
Those lines can easily be grabbed and appended to a known_hosts file.
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Notes:
* This also makes cc_ssh.py *not* write ssh keys to the console.
That means that if keys-to-console is configured off, nothing will
write the keys to the console.
* I removed Garret's use of xargs, replacing with a shell for loop
in write-ssh-key-fingerprints.
taken from
git://pkgs.fedoraproject.org/cloud-init.git
commit 87f33190f43d2b26cced4597e7298835024466c2
Author: Garrett Holmstrom <gholms@fedoraproject.org>
Patch8: cloud-init-0.6.2-sshkeytypes.patch
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This will allow this code to be called more easily elsewhere.
I'm considering having the "all the way up" message contain fingerprints
so that they're more or less guaranteed to get to the console where
the user could see them.
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