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bind/PLATFORMS.md
Ondřej Surý 58bd26b6cf Update the copyright information in all files in the repository 
This commit converts the license handling to adhere to the REUSE
specification.  It specifically:

1. Adds used licnses to LICENSES/ directory

2. Add "isc" template for adding the copyright boilerplate

3. Changes all source files to include copyright and SPDX license
   header, this includes all the C sources, documentation, zone files,
   configuration files.  There are notes in the doc/dev/copyrights file
   on how to add correct headers to the new files.

4. Handle the rest that can't be modified via .reuse/dep5 file.  The
   binary (or otherwise unmodifiable) files could have license places
   next to them in <foo>.license file, but this would lead to cluttered
   repository and most of the files handled in the .reuse/dep5 file are
   system test files.
2022-01-11 09:05:02 +01:00

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Supported platforms

In general, this version of BIND will build and run on any POSIX-compliant system with a C11-compliant C compiler, BSD-style sockets with RFC-compliant IPv6 support, and POSIX-compliant threads, plus the following mandatory libraries:

  • libuv for asynchronous I/O operations and event loops
  • libssl and libcrypto from OpenSSL for cryptography

Use of the following libraries is optional:

  • libjemalloc for improved memory allocation performance
  • libnghttp2 for DNS-over-HTTPS (DoH) support

The following C11 features are used in BIND 9:

  • Atomic operations support, either in the form of C11 atomics or __atomic builtin operations.

  • Thread Local Storage support, either in the form of C11 _Thread_local/thread_local, or the __thread GCC extension.

The C11 variants are preferred.

BIND 9.17 requires a fairly recent version of libuv (at least 1.x). For some of the older systems listed below, you will have to install an updated libuv package from sources such as EPEL, PPA, or other native sources for updated packages. The other option is to build and install libuv from source.

Certain optional BIND features have additional library dependencies. These include:

  • libfstrm and libprotobuf-c for DNSTAP
  • libidn2 for display of internationalized domain names in dig
  • libjson-c for JSON statistics
  • libmaxminddb for geolocation
  • libnghttp2 for DNS over HTTPS
  • libxml2 for XML statistics
  • libz for compression of the HTTP statistics channel
  • readline for line editing in nsupdate and nslookup

ISC regularly tests BIND on many operating systems and architectures, but lacks the resources to test all of them. Consequently, ISC is only able to offer support on a "best effort" basis for some.

Regularly tested platforms

As of Dec 2021, BIND 9.17 is fully supported and regularly tested on the following systems:

  • Debian 9, 10, 11
  • Ubuntu LTS 18.04, 20.04
  • Fedora 35
  • Red Hat Enterprise Linux / CentOS / Oracle Linux 7, 8
  • FreeBSD 12.3, 13.0
  • OpenBSD 7.0
  • Alpine Linux 3.15

The amd64, i386, armhf and arm64 CPU architectures are all fully supported.

Best effort

The following are platforms on which BIND is known to build and run. ISC makes every effort to fix bugs on these platforms, but may be unable to do so quickly due to lack of hardware, less familiarity on the part of engineering staff, and other constraints. None of these are tested regularly by ISC.

  • macOS 10.12+
  • Solaris 11
  • NetBSD
  • Other Linux distributions still supported by their vendors, such as:
    • Ubuntu 20.10+
    • Gentoo
    • Arch Linux
  • OpenWRT/LEDE 17.01+
  • Other CPU architectures (mips, mipsel, sparc, ...)

Community maintained

These systems may not all have the required dependencies for building BIND easily available, although it will be possible in many cases to compile those directly from source. The community and interested parties may wish to help with maintenance, and we welcome patch contributions, although we cannot guarantee that we will accept them. All contributions will be assessed against the risk of adverse effect on officially supported platforms.

  • Platforms past or close to their respective EOL dates, such as:
    • Ubuntu 14.04, 16.04 (Ubuntu ESM releases are not supported)
    • CentOS 6
    • Debian Jessie
    • FreeBSD 10.x, 11.x

Unsupported platforms

These are platforms on which BIND 9.17 is known not to build or run:

  • Platforms without at least OpenSSL 1.0.2
  • Windows
  • Solaris 10 and older
  • Platforms that don't support IPv6 Advanced Socket API (RFC 3542)
  • Platforms that don't support atomic operations (via compiler or library)
  • Linux without NPTL (Native POSIX Thread Library)
  • Platforms on which libuv cannot be compiled