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12 changes: 10 additions & 2 deletions admin_guide/high_availability.adoc
Original file line number Diff line number Diff line change
Expand Up @@ -29,8 +29,16 @@ For some IP-based traffic services, virtual IP addresses (VIPs) should always be
serviced for as long as a single instance is available. This simplifies the
operational overhead and handles failure cases gracefully.

IMPORTANT: Even though
a service is highly available, performance can still be affected.
[IMPORTANT]
====
Setting up a nodePort is a privileged operation.
====

[IMPORTANT]
====
Even though a service VIP is highly available, performance can still be affected. *keepalived* makes sure that each of the VIPs is serviced by some node in the configuration, and several VIPs may end up on the same node even when other nodes have none. Strategies that externally load balance across a set of VIPs
may be thwarted when ipfailover puts multiple VIPs on the same node.
====

Use cases for high-availability include:

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