1# Unbound 2 3[](https://travis-ci.org/NLnetLabs/unbound) 4[](https://repology.org/project/unbound/versions) 5[](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:unbound) 6[](https://unbound.readthedocs.io/en/latest/?badge=latest) 7 8Unbound is a validating, recursive, caching DNS resolver. It is designed to be 9fast and lean and incorporates modern features based on open standards. If you 10have any feedback, we would love to hear from you. Don’t hesitate to 11[create an issue on Github](https://github.com/NLnetLabs/unbound/issues/new) 12or post a message on the [Unbound mailing list](https://lists.nlnetlabs.nl/mailman/listinfo/unbound-users). 13You can learn more about Unbound by reading our 14[documentation](https://nlnetlabs.nl/documentation/unbound/). 15 16## Compiling 17 18Make sure you have the C toolchain, OpenSSL and its include files, and libexpat 19installed. Unbound can be compiled and installed using: 20 21``` 22./configure && make && make install 23``` 24 25You can use libevent if you want. libevent is useful when using many (10000) 26outgoing ports. By default max 256 ports are opened at the same time and the 27builtin alternative is equally capable and a little faster. 28 29Use the `--with-libevent=dir` configure option to compile Unbound with libevent 30support. 31 32## Unbound configuration 33 34All of Unbound's configuration options are described in the man pages, which 35will be installed and are available on the Unbound 36[documentation page](https://nlnetlabs.nl/documentation/unbound/). 37 38An example configuration file is located in 39[doc/example.conf](https://github.com/NLnetLabs/unbound/blob/master/doc/example.conf.in). 40
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