coredns 编译模式添加插件

备注：

   coredns 默认已经安装了一些插件，比如大家用的多的kubernetes etcd ... 但是我们可以自己编译插件，构建我们自己的

coredns 版本，方便集成使用

1. 项目结构

├── Corefile
├── coredns.go

2. 参考代码

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. 代码说明

a. main.go 

为集成全部插件，我使用了 coredns 源码中的plugins 配置代码里面包含了默认的全部，同时我添加了
官方的example  以及一个redis 插件

b. Corefile

配置文件使用已有的插件  example

4. 构建

a. 依赖包安装

简答的方式是使用源码包中的make 脚本，对于没有的使用go get  进行安装

b. 构建

go build

c. 查看编译的插件

./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. 运行

sudo ./main -conf Corefile

参考日志：

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. 参考资料

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/