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Add note on NTP sync (#4919)

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Jim Galasyn 2017-10-12 10:40:18 -07:00 committed by GitHub
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datacenter/ucp/2.2/guides/admin/install/system-requirements.md
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@ -73,6 +73,14 @@ to communicate before they time out.
| RethinkDB | 10000 | no |
| Stand-alone swarm | 90000 | no |
## Time Synchronization
In distributed systems like Docker UCP, time synchronization is critical
to ensure proper operation. As a best practice to ensure consistency between
the engines in a UCP swarm, all engines should regularly synchronize time
with a Network Time Protocol (NTP) server. If a server's clock is skewed,
unexpected behavior may cause poor performance or even failures.
## Compatibility and maintenance lifecycle
Docker EE is a software subscription that includes three products: