72 lines
2.7 KiB
ReStructuredText
72 lines
2.7 KiB
ReStructuredText
.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
|
|
..
|
|
.. SPDX-License-Identifier: MPL-2.0
|
|
..
|
|
.. This Source Code Form is subject to the terms of the Mozilla Public
|
|
.. License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
|
|
..
|
|
.. See the COPYRIGHT file distributed with this work for additional
|
|
.. information regarding copyright ownership.
|
|
|
|
.. _requirements:
|
|
|
|
Resource Requirements
|
|
=====================
|
|
|
|
.. _hw_req:
|
|
|
|
Hardware Requirements
|
|
---------------------
|
|
|
|
DNS hardware requirements have traditionally been quite modest. For many
|
|
installations, servers that have been retired from active duty
|
|
have performed admirably as DNS servers.
|
|
|
|
However, the DNSSEC features of BIND 9 may be quite CPU-intensive,
|
|
so organizations that make heavy use of these features may wish
|
|
to consider larger systems for these applications. BIND 9 is fully
|
|
multithreaded, allowing full utilization of multiprocessor systems for
|
|
installations that need it.
|
|
|
|
.. _cpu_req:
|
|
|
|
CPU Requirements
|
|
----------------
|
|
|
|
CPU requirements for BIND 9 range from i386-class machines, for serving
|
|
static zones without caching, to enterprise-class machines
|
|
to process many dynamic updates and DNSSEC-signed zones, serving
|
|
many thousands of queries per second.
|
|
|
|
.. _mem_req:
|
|
|
|
Memory Requirements
|
|
-------------------
|
|
|
|
Server memory must be sufficient to hold both the cache and the
|
|
zones loaded from disk. The :any:`max-cache-size` option can
|
|
limit the amount of memory used by the cache, at the expense of reducing
|
|
cache hit rates and causing more DNS traffic. It is still good practice
|
|
to have enough memory to load all zone and cache data into memory;
|
|
unfortunately, the best way to determine this for a given installation
|
|
is to watch the name server in operation. After a few weeks, the server
|
|
process should reach a relatively stable size where entries are expiring
|
|
from the cache as fast as they are being inserted.
|
|
|
|
.. _intensive_env:
|
|
|
|
Name Server-Intensive Environment Issues
|
|
----------------------------------------
|
|
|
|
For name server-intensive environments, there are two
|
|
configurations that may be used. The first is one where clients and any
|
|
second-level internal name servers query the main name server, which has
|
|
enough memory to build a large cache; this approach minimizes the
|
|
bandwidth used by external name lookups. The second alternative is to
|
|
set up second-level internal name servers to make queries independently.
|
|
In this configuration, none of the individual machines need to have as
|
|
much memory or CPU power as in the first alternative, but this has the
|
|
disadvantage of making many more external queries, as none of the name
|
|
servers share their cached data.
|
|
|