Been having this problem for a while. Most machines used to be either cloud stacks (like XCP) or FC16 machines (traffic capture) and I had no problem with them. For someone who runs automation across machines, inability to login into SSH passwordlessly is a huge problem. Not because of SSH per se, but because RSYNC over SSH is probably the safest way to sync files across machines and if each RSYNC keeps asking you for the password, ... then you cannot get anything done.
Found several places where this was discussed. But the actual solution was much simpler.
> vi /etc/ssh/sshd_config
#MaxAuthTries 6
#MaxSessions 10
#RSAAuthentication yes
PubkeyAuthentication yes
# The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2
# but this is overridden so installations will only check .ssh/authorized_keys
#AuthorizedKeysFile .ssh/authorized_keys
#AuthorizedKeysCommand none
The key is the authorized_keys2. It looks like FC18 forces SSH to read *_keys file instead of _keys2. Since I was using the customary *_keys2 file, I could not login without the password. As soon as I commented it out, I got my passwordless login.
Weird how things change sometimes.
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