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SSH - Distribute public keys

Any generic configuration management software like Puppet, Chef, Bcfg2 or cfengine could accomplish the task.

A very easy solution, that does the same with firewall-rules

Example file hosts.conf:

192.168.0.1
192.168.2.99
192.168.2.100

#!/bin/bash
for d in `cat ./hosts.conf`; do
  echo "copying to $d ...";
  scp /root/.ssh./authorized_keys root@$d:/root/.ssh./authorized_keys
done;