准备

[root@VM_100_6_centos opt]# ls
coredns_1.6.5_linux_amd64.tgz  rh
[root@VM_100_6_centos opt]# 
[root@VM_100_6_centos opt]# 
[root@VM_100_6_centos opt]# tar xzvf coredns_1.6.5_linux_amd64.tgz 
coredns
[root@VM_100_6_centos opt]# ls
coredns  coredns_1.6.5_linux_amd64.tgz  rh
[root@VM_100_6_centos opt]# file coredns
coredns: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), statically linked, stripped

查看帮助

[root@VM_100_6_centos opt]# ./coredns --help
Usage of ./coredns:
  -conf string
        Corefile to load (default "Corefile")
  -dns.port string
        Default port (default "53")
  -pidfile string
        Path to write pid file
  -plugins
        List installed plugins
  -quiet
        Quiet mode (no initialization output)
  -version
        Show version

创建两个配置文件 Corefile 和 example.org

[root@VM_100_6_centos opt]# ll
total 53108
-rwxr-xr-x  1   33   33 41365504 Nov  5 21:57 coredns
-rw-r--r--  1 root root 13002512 Nov 21 16:59 coredns_1.6.5_linux_amd64.tgz
-rw-r--r--  1 root root      145 Nov 21 17:09 Corefile
-rw-r--r--  1 root root      434 Nov 21 17:08 example.org
drwxr-xr-x. 2 root root     4096 Mar 26  2015 rh
[root@VM_100_6_centos opt]# 
[root@VM_100_6_centos opt]# cat Corefile 
example.org {
    file example.org
    prometheus     # enable metrics
    errors         # show errors
    log            # enable query logs
}
[root@VM_100_6_centos opt]# cat example.org 
$ORIGIN example.org.
@   3600 IN SOA sns.dns.icann.org. noc.dns.icann.org. (
                2017042745 ; serial
                7200       ; refresh (2 hours)
                3600       ; retry (1 hour)
                1209600    ; expire (2 weeks)
                3600       ; minimum (1 hour)
                )

    3600 IN NS a.iana-servers.net.
    3600 IN NS b.iana-servers.net.

www     IN A     127.0.0.1
        IN AAAA  ::1
[root@VM_100_6_centos opt]# 

启动CoreDNS运行

[root@VM_100_6_centos opt]# ./coredns -conf Corefile -dns.port 1053
example.org.:1053
CoreDNS-1.6.5
linux/amd64, go1.13.4, c2fd1b2

使用dig测试

[root@VM_100_6_centos ~]# dig -p 1053 @localhost AAAA www.example.org +noall +answer

; <<>> DiG 9.9.4-RedHat-9.9.4-50.el7 <<>> -p 1053 @localhost AAAA www.example.org +noall +answer
; (2 servers found)
;; global options: +cmd
www.example.org.    3600    IN  AAAA    ::1
[root@VM_100_6_centos ~]# 

在CoreDNS的标准输出显示

[INFO] [::1]:44111 - 32024 "AAAA IN www.example.org. udp 44 false 4096" NOERROR qr,aa,rd 162 0.00012048s

DEMO 跑成功了

下面研究 ：
zone file 的配置 （同bind9）
CoreDNS集群/主备
CoreDNS插件

CoreDNS已经安装的插件

[root@VM_100_6_centos opt]# ./coredns -plugins
Server types:
  dns

Caddyfile loaders:
  flag
  default

Other plugins:
  dns.acl
  dns.any
  dns.auto
  dns.autopath
  dns.azure
  dns.bind
  dns.cache
  dns.cancel
  dns.chaos
  dns.clouddns
  dns.debug
  dns.dnssec
  dns.dnstap
  dns.erratic
  dns.errors
  dns.etcd
  dns.federation
  dns.file
  dns.forward
  dns.grpc
  dns.health
  dns.hosts
  dns.k8s_external
  dns.kubernetes
  dns.loadbalance
  dns.log
  dns.loop
  dns.metadata
  dns.nsid
  dns.pprof
  dns.prometheus
  dns.ready
  dns.reload
  dns.rewrite
  dns.root
  dns.route53
  dns.secondary
  dns.sign
  dns.template
  dns.tls
  dns.trace
  dns.transfer
  dns.whoami
  on