A simple and fast dns cache server written by go.
Similar to dnsmasq ,but support some difference features:
-
Keep hosts records in redis and the local file /etc/hosts
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Auto-Reloads when hosts configuration is changed. (Yes, dnsmasq needs to be reloaded)
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Install
$ go get github.com/kenshinx/godns
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Build
$ cd $GOPATH/src/github.com/kenshinx/godns $ go build -o godns
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Running
$ sudo ./godns -c godns.conf
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Test
$ dig www.github.com @127.0.0.1
More details about how to install and running godns can reference my blog (Chinese)
$ sudo vi /etc/resolv.conf
nameserver #the ip of godns running
All the configuration in godns.conf
is a TOML format config file.
More about Toml :https://github.com/mojombo/toml
Upstream server can be configured by changing file from somewhere other than "/etc/resolv.conf"
[resolv]
resolv-file = "/etc/resolv.conf"
If multiple namerservers
are set in resolv.conf, the upsteam server will try in a top to bottom order
Only the local memory storage backend is currently implemented. The redis backend is in the todo list
[cache]
backend = "memory"
expire = 600 # default expire time 10 minutes
maxcount = 100000
Force resolve domain to assigned ip, support two types hosts configuration:
- locale hosts file
- remote redis hosts
hosts file
can be assigned at godns.conf,default : /etc/hosts
[hosts]
host-file = "/etc/hosts"
redis hosts
This is a special requirment in our system. Must maintain a global hosts configuration, and support update the hosts record from other remote server. so "redis-hosts" will be supported, and will query the redis db when each dns request is reached.
The hosts record is organized with redis hash map. and the key of the map is configured.
[hosts]
redis-key = "godns:hosts"
Insert hosts records into redis
redis > hset godns:hosts www.sina.com.cn 1.1.1.1
Debug close
$ go test -bench=.
testing: warning: no tests to run
PASS
BenchmarkDig-8 50000 57945 ns/op
ok _/usr/home/keqiang/godns 3.259s
The result : 15342 queries/per second
The test environment:
CentOS release 6.4
-
CPU:
Intel Xeon 2.40GHZ 4 cores -
MEM:
46G
Joke: A web console for godns
https://github.com/kenshinx/joke
screenshot
Deployment in productive supervisord highly recommended.
[program:godns]
command=/usr/local/bin/godns -c /etc/godns.conf
autostart=true
autorestart=true
user=root
stdout_logfile_maxbytes = 50MB
stdoiut_logfile_backups = 20
stdout_logfile = /var/log/godns.log
- The redis cache backend
- Update ttl
godns is under the MIT license. See the LICENSE file for details.