背景
为了方便记忆，我们的线上服务器都按照一定规则定义了hostname,这样就不用记忆ip了，之前机器很少，直接在每台机器上配置了host（/etc/hosts）就行了，但是每次增加机器就要逐台修改host配置，比较麻烦，想着内部配置一个DNS就能很好解决这个问题。

安装
yum install named bind bind-chroot bind-utils

配置

vim /etc/named.conf

options {
listen-on port 53 { any; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt";
allow-query     { any;};
recursion yes;
dnssec-enable yes;
dnssec-validation yes;
bindkeys-file "/etc/named.iscdlv.key";
managed-keys-directory "/var/named/dynamic";
pid-file "/run/named/named.pid";
session-keyfile "/run/named/session.key";
};
logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};


zone "." IN {
type hint;
file "named.ca";
};

zone "ydh.net" {
type master;
file "/var/named/ydh.net.zone";
};

vim /var/named/ydh.net.zone

$TTL 3H
@       IN SOA  @ ydh.net. (
        0       ; serial
        1D      ; refresh
        1H      ; retry
        1W      ; expire
        3H )      ; minimum


@ IN      NS      ns.ydh.net.
ns      IN      A       10.xxx.xxx.xxx
www                  IN      A       10.xxx.xxx.xxx
t01.bj         IN      A    10.xxx.xxx.xxx

启动服务

systemctl restart  named.service

设置开机启动

systemctl enable named

使用DNS服务器
vim /etc/resolv.conf

nameserver 10.xxx.xxx.xxx

测试

ping     t01.bj.ydh.net

看能否通