194 lines
3.5 KiB
Markdown
194 lines
3.5 KiB
Markdown
GODNS
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====
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A simple and fast dns cache server written by go.
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Similar to [dnsmasq](http://www.thekelleys.org.uk/dnsmasq/doc.html), but supports some difference features:
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* 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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## Installation & Running
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1. Install
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$ go get github.com/kenshinx/godns
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2. Build
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$ cd $GOPATH/src/github.com/kenshinx/godns
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$ go build -o godns
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3. Running
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$ sudo ./godns -c godns.conf
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4. Test
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$ dig www.github.com @127.0.0.1
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More details about how to install and running godns can reference my [blog (Chinese)](http://blog.kenshinx.me/blog/compile-godns/)
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## Use godns
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$ sudo vi /etc/resolv.conf
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nameserver #the ip of godns running
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## Configuration
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All the configuration in `godns.conf` is a TOML format config file.
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More about Toml :[https://github.com/mojombo/toml](https://github.com/mojombo/toml)
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#### resolv.conf
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Upstream server can be configured by changing file from somewhere other than "/etc/resolv.conf"
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```
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[resolv]
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resolv-file = "/etc/resolv.conf"
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```
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If multiple `namerservers` are set in resolv.conf, the upsteam server will try in a top to bottom order
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#### cache
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Only the local memory storage backend is currently implemented. The redis backend is in the todo list
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```
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[cache]
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backend = "memory"
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expire = 600 # default expire time 10 minutes
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maxcount = 100000
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```
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#### hosts
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Force resolve domain to assigned ip, support two types hosts configuration:
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* locale hosts file
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* remote redis hosts
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__hosts file__
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can be assigned at godns.conf,default : `/etc/hosts`
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```
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[hosts]
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host-file = "/etc/hosts"
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```
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Hosts file format is described in [linux man pages](http://man7.org/linux/man-pages/man5/hosts.5.html).
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More than that , `*.` wildcard is supported additional.
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__redis hosts__
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This is a special requirment in our system. Must maintain a global hosts configuration,
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and support update the hosts record from other remote server.
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so "redis-hosts" will be supported, and will query the redis db when each dns request is reached.
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The hosts record is organized with redis hash map. and the key of the map is configured.
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```
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[hosts]
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redis-key = "godns:hosts"
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```
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_Insert hosts records into redis_
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```
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redis > hset godns:hosts www.test.com 1.1.1.1
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```
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Compared with file-backend records, redis-backend hosts support two advanced records formatting.
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1. `*.` wildcard
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```
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redis > hset godns:hosts *.example.com 127.0.0.1
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```
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2. Multiple A entries, delimited by commas
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```
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redis > hset godns:hosts www.test.com 1.1.1.1,2.2.2.2
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```
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## Benchmark
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__Debug close__
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```
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$ go test -bench=.
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testing: warning: no tests to run
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PASS
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BenchmarkDig-8 50000 57945 ns/op
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ok _/usr/home/keqiang/godns 3.259s
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```
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The result : 15342 queries/per second
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The test environment:
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CentOS release 6.4
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* CPU:
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Intel Xeon 2.40GHZ
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4 cores
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* MEM:
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46G
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## Web console
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Joke: A web console for godns
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[https://github.com/kenshinx/joke](https://github.com/kenshinx/joke)
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screenshot
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## Deployment
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Deployment in productive supervisord highly recommended.
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```
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[program:godns]
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command=/usr/local/bin/godns -c /etc/godns.conf
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autostart=true
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autorestart=true
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user=root
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stdout_logfile_maxbytes = 50MB
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stdoiut_logfile_backups = 20
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stdout_logfile = /var/log/godns.log
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```
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## TODO
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* The redis cache backend
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* Update ttl
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## LICENSE
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godns is under the MIT license. See the LICENSE file for details.
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