"If you have multiple servers with similar or identical
configurations (such as nodes in a cluster), it's often difficult
to make sure the contents and configuration of those servers are
identical. It's even more difficult when you need to make
configuration modifications from the command line, knowing you'll
have to execute the exact same command on a large number of systems
(better get coffee first). You could try writing a script to
perform the task automatically, but sometimes scripting is overkill
for the work to be done. Fortunately, there's another way to
execute commands on multiple hosts simultaneously..."
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