requirements.rst 1.65 KB
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.. highlight:: none
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.. _Requirements:
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Requirements
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Hardware
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Knot DNS requirements are not very demanding for typical
installations, and a commodity server or a virtual solution will be
sufficient in most cases.

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However, please note that there are some scenarios that will require
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administrator's attention and a testing of exact requirements before
deploying Knot DNS to a production environment. These cases include deployment for a
large number of zones (DNS hosting), large number of records in one
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or more zones (TLD) or large number of requests.

CPU requirements
----------------

Knot DNS scales with processing power and also with the number of
available cores/CPUs.

There is no lower bound on the CPU requirements, but it should support
memory barriers and CAS (i586 and newer).

Memory requirements
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Knot DNS implementation focuses on performance and thus can be quite
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memory demanding. The rough estimate for memory requirements is
3 times the size of the zone in text format. Again this is only
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an estimate and you are advised to do your own measurements before
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deploying Knot DNS to production.
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Also note that to ensure uninterrupted serving of the zone, Knot DNS
employs a Read-Copy-Update mechanism instead of locking and thus
requires twice the amount of memory for the duration of incoming
transfers.

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Operating system
================
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Knot DNS itself is written in a portable way, but it depends on
several libraries. Namely userspace-rcu, which could be a constraint
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when it comes to the operating system support. Knot DNS can be compiled
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and run on most UNIX-like systems, such as Linux, \*BSD, and OS X.