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System - High Availability: explain "Disable preempt" and explain "Automatic failover" a bit better (settings page, versus functionality)

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Ad Schellevis 2021-07-26 11:49:15 +02:00
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14
source/manual/hacarp.rst
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@ -71,12 +71,12 @@ Settings
Automatic failover
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If the primary firewall becomes unavailable, the secondary firewall will take
over without user intervention and minimal interruption.
Although not really a setting on the high availability setup page, it's a crucial part of high available setups.
Using CARP type virtual addresses, the secondary firewall will take over without user intervention and minimal
interruption when the primary becomes unavailable.
Virtual IPs of the type CARP (:doc:`/manual/firewall_vip`) are required for this feature.
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Synchronized state tables
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@ -85,6 +85,14 @@ The firewall’s state table is replicated to all failover configured firewalls.
This means the existing connections will be maintained in case of a failure,
which is important to prevent network disruptions.
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Disable preempt
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By default this option is deselected, which is the advised scenario for most common HA setups.
The preempt option make sure that multiple carp interfaces will act as a group (all :code:`backup` or :code:`master`)
at the same time, assuming no technical issues exist between both.
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Configuration synchronization
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