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Feature #6230

closed

Increase Unbound Host Cache

Added by Clinton Cory over 8 years ago. Updated over 8 years ago.

Status:
Resolved
Priority:
Normal
Category:
DNS Resolver
Target version:
Start date:
04/21/2016
Due date:
% Done:

0%

Estimated time:
Plus Target Version:
Release Notes:

Description

Versions 2.* have a drop-down option under DNS Resolver -> Advanced:
"Number of Hosts to cache"

The maximum number of hosts presented is 50,000. This value is updated in /var/unbound/unbound.conf:
infra-cache-numhosts: 50000

Several of our servers appear to be exceeding this:
msg.cache.count=96942

The server referenced above is an R320 with a 10gig NIC. It frequently passes over 1Gb of traffic with several thousand clients.

Additionally, several tuning guides recommend increasing this value to 100,000. Here is one of them:
https://calomel.org/unbound_dns.html

Rather than hacking something outside of the webGUI I feel it'd be of value to add 100,000 as an option in the drop-down.

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