GODNS

A simple and fast dns cache server written by go.

Similar as dnsmasq ,but support some difference features:

• Keep hosts records in redis instead of the local file /etc/hosts

• Atuo-Reload when hosts configuration changed. (Yes,dnsmasq need restart)

• Cache records save in memory or redis configurable

Install & Running

1. Install

    $ go get github.com/kenshinx/godns
   

2. Build

    $ cd $GOPATH/src/github.com/kenshinx/godns 
    $ go build -o godns *.go
   

3. Running

    $ sudo ./godns -c godns.conf
   

4. Use

    $ sudo vi /etc/resolv.conf
    nameserver 127.0.0.1
   

Configuration

All the configuration on godns.conf a TOML formating config file.
More about Toml :https://github.com/mojombo/toml

resolv.conf

Upstream server can be configuration by change file from somewhere other that "/etc/resolv.conf"

[resolv]
resolv-file = "/etc/resolv.conf"

If multi namerserver set at resolv.conf, the upsteam server will try in order of up to botton

hosts

cache

Only the local memory storage backend implemented now. The redis backend is in todo list

[cache]
backend = "memory"   
expire = 600  # default expire time 10 minutes
maxcount = 100000

Benchmak

$ go test -bench=.

testing: warning: no tests to run
PASS
BenchmarkDig-4	    5000	    435141 ns/op
ok  	_/Users/kenshin/workspace/godns	2.270s

The result : 2200 queries/per second

The enviroment of test:

MacBook Air

• CPU:
  Inter Core i5 1.7G
  Double cores

• MEM:
  8G

TODO

• The redis cache backend
• Update ttl