coredns 編譯模式添加插件

備注：

   coredns 默認已經安裝了一些插件，比如大家用的多的kubernetes etcd ... 但是我們可以自己編譯插件，構建我們自己的

coredns 版本，方便集成使用

1. 項目結構

├── Corefile
├── coredns.go

2. 參考代碼

a. main.go

package main
import (
        _ "github.com/coredns/example"
        "github.com/coredns/coredns/coremain"
        _ "github.com/coredns/coredns/plugin/auto"
	_ "github.com/coredns/coredns/plugin/autopath"
	_ "github.com/coredns/coredns/plugin/bind"
	_ "github.com/coredns/coredns/plugin/cache"
	_ "github.com/coredns/coredns/plugin/chaos"
	_ "github.com/coredns/coredns/plugin/debug"
	_ "github.com/coredns/coredns/plugin/dnssec"
	_ "github.com/coredns/coredns/plugin/dnstap"
	_ "github.com/coredns/coredns/plugin/erratic"
	_ "github.com/coredns/coredns/plugin/errors"
	_ "github.com/coredns/coredns/plugin/etcd"
	_ "github.com/coredns/coredns/plugin/federation"
	_ "github.com/coredns/coredns/plugin/file"
	_ "github.com/coredns/coredns/plugin/health"
	_ "github.com/coredns/coredns/plugin/hosts"
	_ "github.com/coredns/coredns/plugin/kubernetes"
	_ "github.com/coredns/coredns/plugin/loadbalance"
	_ "github.com/coredns/coredns/plugin/log"
	_ "github.com/coredns/coredns/plugin/metrics"
	_ "github.com/coredns/coredns/plugin/nsid"
	_ "github.com/coredns/coredns/plugin/pprof"
	_ "github.com/coredns/coredns/plugin/proxy"
	_ "github.com/coredns/coredns/plugin/reload"
	_ "github.com/coredns/coredns/plugin/reverse"
	_ "github.com/coredns/coredns/plugin/rewrite"
	_ "github.com/coredns/coredns/plugin/root"
	_ "github.com/coredns/coredns/plugin/route53"
	_ "github.com/coredns/coredns/plugin/secondary"
	_ "github.com/coredns/coredns/plugin/template"
	_ "github.com/coredns/coredns/plugin/tls"
	_ "github.com/coredns/coredns/plugin/trace"
	_ "github.com/coredns/coredns/plugin/whoami"
	_ "github.com/coredns/example"
	_ "github.com/coredns/forward"
	_ "github.com/mholt/caddy/onevent"
        _ "github.com/mholt/caddy/startupshutdown"
        _ "github.com/arvancloud/redis"
        "github.com/coredns/coredns/core/dnsserver"
)
var directives = []string{
        "example",
        "tls",
	"reload",
	"nsid",
	"root",
	"bind",
	"debug",
	"trace",
	"health",
	"pprof",
	"prometheus",
	"errors",
	"log",
	"dnstap",
	"chaos",
	"loadbalance",
	"cache",
	"rewrite",
	"dnssec",
	"autopath",
	"reverse",
	"template",
	"hosts",
	"route53",
	"federation",
	"kubernetes",
	"file",
	"auto",
        "secondary",
        "etcd",
        "redis",
	"forward",
	"proxy",
	"erratic",
	"whoami",
	"on",
	"startup",
	"shutdown",
}

func init() {
        dnsserver.Directives = directives
}

func main() {
        coremain.Run()
}

    
b. Corefile
    
example.com {
  proxy . 8.8.8.8:53
  log
  example
}

3. 代碼說明

a. main.go 

為集成全部插件，我使用了 coredns 源碼中的plugins 配置代碼里面包含了默認的全部，同時我添加了
官方的example  以及一個redis 插件

b. Corefile

配置文件使用已有的插件  example

4. 構建

a. 依賴包安裝

簡答的方式是使用源碼包中的make 腳本，對於沒有的使用go get  進行安裝


b. 構建

go build

c. 查看編譯的插件

./main -plugins

Password:
Server types:
  dns

Caddyfile loaders:
  flag
  default

Other plugins:
  dns.auto
  dns.autopath
  dns.bind
  dns.cache
  dns.chaos
  dns.debug
  dns.dnssec
  dns.dnstap
  dns.erratic
  dns.errors
  dns.etcd
  dns.example
  dns.federation
  dns.file
  dns.forward
  dns.health
  dns.hosts
  dns.kubernetes
  dns.loadbalance
  dns.log
  dns.nsid
  dns.pprof
  dns.prometheus
  dns.proxy
  dns.redis
  dns.reload
  dns.reverse
  dns.rewrite
  dns.root
  dns.route53
  dns.secondary
  dns.template
  dns.tls
  dns.trace
  dns.whoami
  on
  shutdown
  startup

5. 運行

sudo ./main -conf Corefile

參考日志：

example.com.:53
2018/02/02 22:32:12 [INFO] CoreDNS-1.0.5
2018/02/02 22:32:12 [INFO] darwin/amd64, go1.9.3, 
CoreDNS-1.0.5
darwin/amd64, go1.9.3, 
2018/02/02 22:32:12 [INFO] "A IN connpm.gj.qq.com." - No such zone at dns://:53 (Remote: 192.168.31.161:59752)
2018/02/02 22:32:41 [INFO] "A IN www.thoughtworks.com." - No such zone at dns://:53 (Remote: 192.168.31.161:52965)
2018/02/02 22:32:45 [INFO] "A IN static.thoughtworks.com." - No such zone at dns://:53 (Remote: 192.168.31.161:54903)
2018/02/02 22:32:45 [INFO] "A IN s7.addthis.com." - No such zone at dns://:53 (Remote: 192.168.31.161:63212)
2018/02/02 22:32:45 [INFO] "A IN qzonestyle.gtimg.cn." - No such zone at dns://:53 (Remote: 192.168.31.161:54212)
2018/02/02 22:32:45 [INFO] "A IN app-e.marketo.com." - No such zone at dns://:53 (Remote: 192.168.31.161:62861)
2018/02/02 22:32:45 [INFO] "A IN dynamic.thoughtworks.com." - No such zone at dns://:53 (Remote: 192.168.31.161:54761)
2018/02/02 22:3
。。。。。

6. 參考資料

https://github.com/coredns/example
https://github.com/arvancloud/redis
https://github.com/coredns/coredns
https://coredns.io/2017/07/25/compile-time-enabling-or-disabling-plugins/