DNS 主从同步

Posted 2020-12-28

dns主从同步

环境

两台台centos7.4版本的虚拟机，主虚拟机IP为：192.168.100.139， 从虚拟机IP：192.168.100.140.两台虚拟机均安装bind。虚拟机均关闭防护墙

systemctl stop firewalld.service

setenforce 0

yum install bind -y

实验

在主虚拟机上编辑。

按照要求修改配置文件：
主配置文件：vim /etc/named.conf

修改前
options {
        listen-on port 53 { 127.0.0.1; };
        .......
        allow-query     { localhost; };
修改后
listen-on port 53 { 192.168.100.139; };
......
allow-query     { any; };

编辑区域配置文件：
vim /etc/named.rfc1912.zones

复制模板，
zone "localhost" IN {
        type master;
        file "named.localhost";
        allow-update { none; };
};
修改
zone "benet.com" IN {
        type master;
        file "benet.com.zone";
        allow-transfer { 192.168.100.140; };     //从服务器地址。允许传输的地址
};

保存退出

编辑区域数据文件：
cp -p /var/named/named.localhost /var/named/benet.com.zone

vim /var/named/benet.com.zone

修改前：
$TTL 1D
@       IN SOA  @ rname.invalid. (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
        NS      @
        A       127.0.0.1
        AAAA    ::1
修改后
$TTL 1D
@       IN SOA  @ admin (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
        NS      @
        A       192.168.100.139
www IN  A       192.168.100.139
保存退出

从虚拟机上编辑：

编辑主配置文件

修改前：
options {
        listen-on port 53 { 127.0.0.1; };
        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     { localhost; };
修改后：
options {
        listen-on port 53 { 192.168.100.140; };  //换为本机IP
        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; };
保存退出

编辑区域配置文件

复制一份配置文件
zone "localhost" IN {
        type master;
        file "named.localhost";
        allow-update { none; };
};
修改后的：
zone "benet.com" IN {
        type slave;
        file "slaves/benet.com.zone";
        masters { 192.168.100.139; };  //向此IP获取同步。
};
保存退出

查看slaves文件夹

[[email protected] named]# cd /var/named/
[[email protected] named]# ls
data  dynamic  named.ca  named.empty  named.localhost  named.loopback  slaves
[[email protected] named]# cd slaves/
[[email protected] slaves]# ls
[[email protected] slaves]# 

echo "nameserver 192.168.100.140" > /etc/resolv.conf
启动两台虚拟机的dns服务：

systemctl start named.service

再次查看slaves文件夹

[[email protected] slaves]# ls
benet.com.zone
本来没有文件，现在同步过来了

解析一下，结果没问题。成功。
[[email protected] slaves]# nslookup www.benet.com
Server: 192.168.100.140
Address: 192.168.100.140#53

Name: www.benet.com
Address: 192.168.100.139

[[email protected] slaves]#