coredns

灵活、可扩展DNS服务器 https://github.com/coredns/coredns

安装

自行编译或下载二进制包

使用

配置

• 配置文件Corefile

    .:53 {
        hosts ./zj-hosts {
            ttl 600 #second
        }
        log
    }

• host文件zj-hosts

    172.17.0.3 redis.zj
    172.17.0.2 mysql.zj

部署&测试

docker部署docker run -d --name="test-dns-zj" zj0395/coredns:latest 查看容器ipdocker inspect test-dns-zj | grep IPAddress | awk '{print $2}' | awk -F '"' '{print $2}' | tail -n 1 测试dig @YOURIP redis.zj

[zj@VM-0-11-ubuntu ~]# dig @172.17.0.6 redis.zj

; <<>> DiG 9.11.3-1ubuntu1.11-Ubuntu <<>> @172.17.0.6 redis.zj
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54118
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: e0b74b6aa72b256b (echoed)
;; QUESTION SECTION:
;redis.zj.            IN    A

;; ANSWER SECTION:
redis.zj.        600    IN    A    172.17.0.3

;; Query time: 0 msec
;; SERVER: 172.17.0.6#53(172.17.0.6)
;; WHEN: Wed Feb 05 14:30:34 CST 2020
;; MSG SIZE  rcvd: 73

修改dns配置文件/etc/resolve.conf，增加nameserver YOURIP；该文件只能指定ip，无法指定端口 使用ping redis.zj进行测试

最佳实践

• 作为k8s组件用于服务发现