bind9

Install

```
yum install bind bind-utils
```

backup named.conf file

cp /etc/named.conf /etc/named.conf.bak
    
configure named.conf

```
listen-on port 53 { 127.0.0.1; 192.168.0.201; };
allow-query     { any; };

zone "louyj.com" IN{                
 type master;                       
 file "louyj.com.zone";
};
```

type：

- master指的是主dns解析
- slave指的是从dns解析
- hint指的是根域名解析（根提示域）
- forward指的是转发，转发不使用file

add zone

vi /var/named/louyj.com.zone

```
$TTL 1D
@ IN SOA  ns1.louyj.com. ns2.louyj.com. (
0;serial
1D;refresh
1H;retry
1W;expire
3H;minimum
);
@ IN  NS   ns1
@ IN  NS   ns2
ns1                               IN  A    192.168.0.201
ns2                               IN  A    192.168.0.200
www                               IN  A    192.168.0.201
esxi                              IN  A    192.168.0.201
cloud                             IN  A    192.168.0.201
image                             IN  A    192.168.0.201
media                             IN  A    192.168.0.201
note                              IN  A    192.168.0.201
nexus                             IN  A    192.168.0.201
ceph-grafana                      IN  A    192.168.0.201
ceph                              IN  A    192.168.0.201
code                              IN  A    192.168.0.201
dbeaver                           IN  A    192.168.0.201
che                               IN  A    192.168.0.201
devfile-registry-eclipse-che      IN  A    192.168.0.201
dockerhub                         IN  A    192.168.0.201
estool                            IN  A    192.168.0.201
ghost                             IN  A    192.168.0.201
git                               IN  A    192.168.0.201
graph                             IN  A    192.168.0.201
ide                               IN  A    192.168.0.201
image01                           IN  A    192.168.0.201
jump                              IN  A    192.168.0.201
jumpserver                        IN  A    192.168.0.201
nextcloud01                       IN  A    192.168.0.201
tty                               IN  A    192.168.0.201
*.che                             IN  A    192.168.0.201
```

SOA叫做起始授权机构记录，NS用于标识多台域名解析服务器，SOA记录用于在众多NS记录中那一台是主服务器。

SOA 记录表示此域名的权威解析服务器地址。 当要查询的域名在所有递归解析服务器中没要域名解析的缓存时，就会回源来请求此域名的SOA记录，也叫权威解析记录。

check configuration

named-checkconf -z
     #or
     named-checkconf
     
restart service

service named restart
     
nslookup test

```
nslookup
> www.louyj.com
```

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