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Chapter 10.
Maintaining Consistent Time: Time Servers
Every time you set up a computer, you must
set its clock. What's worse, computer clocks are imperfect, so they drift from
the true timeand they drift at different rates. The result is that, on a
network of any size, a few weeks (or possibly just a few hours) after you've
set all the computers' clocks to the same time, they'll show annoying
differences. Daylight Savings Time can also cause problems, because you'll have
to set the computers' clocks again or allow the computers to adjust their own
timesa process that can itself cause problems if a computer has more than one
OS installed on it. All told, keeping all your systems' clocks synchronized can
be an administrative headache. Fortunately, a class of programs exists to help
work around this problem:time servers. These
programs deliver accurate time measurements to their clients, so setting up a
central time server and configuring clients to use it can keep all your
computers set to the same time. You can even have your central time server
synchronize itself to an outside time server that sets its time using an atomic
clock, thus allowing for very accurate time settings across your entire network.
