dns第二部分集群

程序员文章站 2024-03-16 10:32:10

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（1）辅助dns
设定slave
选定一台机子作辅助dns机
在辅助机上的操作

1. yum install bind -y
2.vim /etc/named.conf
 listen-on port 53 { any; };
 allow-query     { any; };
 dnssec-validation no;
3.vim /etc/named.rfc1912.zones 
zone "westos.com" IN {
        type slave;
        masters {172.25.254.117; };
        file "slaves/westos.com.zone";
        allow-update { none; };
};
4.vim /etc/resolv.conf
namesever 172.25.254.117
5.systemctl restart named
6.systemctl stop firewalld

主dns设置

vim  /etc/named.rfc1912.zones
zone "westos.com" IN {
        type master;
        file "westos.com.zone";
        allow-update {none; };
        allow-transfer {172.25.254.209; };    ##允许209同步数据
};
$TTL 1D
@       IN SOA  dns.westos.com. root.westos.com. (
                                        0       ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
        NS      dns.westos.com.
dns     A       172.25.254.109
www     A       172.25.254.140
www     A       172.25.254.240
systemctl restart named           ##重启服务

进行以上操作后将在辅助dns机的slaves/有 westos.com.zone文件
可以在辅助dns机中 dig www.westos.com
dns第二部分集群
（2）辅助dns自动获取主dns数据
主dns设置

vim /etc/named.rfc1912.zones 
zone "westos.com" IN {
        type master;
        file "westos.com.zone";
        allow-update { 172.25.254.209; };
        allow-transfer {172.25.254.209; };
        also-notify {172.25.254.209; };    ##主dns发生变化时，将同步到辅助dns
};
 vim /var/named/westos.com.zone 
$TTL 1D
@       IN SOA  dns.westos.com. root.westos.com. (
                                2016112901      ; serial
                                        1D      ; refresh
                                        1H      ; retry
                                        1W      ; expire
                                        3H )    ; minimum
        NS      dns.westos.com.
dns     A       172.25.254.109
www     A       172.25.254.140
www     A       172.25.254.152
systemctl restart named

(以上的操作是改变www.westos.com的ip地址，并且要辅助dns机与之同步，常规操作则必须删除辅助机中slave/westos.com.zone文件，而每次进行这样的操作过于麻烦，而上面的操作则是选择在主dns机中修改/var/named/westos.com.zone文件中的serial值（上限10位数）以达到在以后的操作中自动同步主dns)
在辅助dns上测试
[aaa@qq.com slaves]# dig www.westos.com

（3）远程主机对dns的A记录修改
主dns设置

cp -p /var/named/westos.com.zone /mnt      ##备份到/mnt以便于恢复
vim /etc/named.rfc1912.zones 
zone "westos.com" IN {
        type master;
        file "westos.com.zone";
        allow-update { 172.25.254.209; };   ##允许209 更新
        allow-transfer {172.25.254.209; };
        also-notify {172.25.254.209; };
};
chmod 770 /var/named/                      ##对/var/named组执行权限
systemctl restart named                    ##重启服务

辅助dns设置

[1]删除www.westos.com
[aaa@qq.com slaves]# nsupdate
> server 172.25.254.109
> update delete www.westos.com
> send
> quit

测试结果
[aaa@qq.com slaves]# dig www.westos.com

[2]添加www.westos.com
[aaa@qq.com slaves]# nsupdate
> server 172.25.254.109
> update add www.westos.com 86400 A 172.25.254.160
> send
> quit

测试结果
[aaa@qq.com slaves]# dig www.westos.com

恢复
主dns设置
[aaa@qq.com named]# rm -fr westos.com.zone.jnl westos.com.zone
[aaa@qq.com named]# cp /mnt/westos.com.zone /var/named/
(4)主机更新上锁

一般机子对主dns不可以修改A记录但对于有key的机子开放
[root@dns-server named]# cp -p /etc/rndc.key /etc/westos.key
[root@dns-server named]# cd /mnt
[root@dns-server mnt]# dnssec-****** -a HMAC-MD5 -b 128 -n HOST westos
Kwestos.+157+28134                      ##生成钥匙 -a是加密方式 -b是密码大小 -n是加密用户
[root@dns-server mnt]# scp /mnt/Kwestos.+157+28134.private 172.25.254.209:/mnt
root@172.25.254.209's password: 
Kwestos.+157+28134.private                                                   100%  165     0.2KB/s   00:00    
[aaa@qq.com mnt]# scp /mnt/Kwestos.+157+28134.key 172.25.254.209:/mnt
aaa@qq.com's password: 
Kwestos.+157+28134.key                                                       100%   50     0.1KB/s   00:00   

[root@dns-server mnt]# vim /etc/westos.key 
key "westos" {
        algorithm hmac-md5;
        secret "Lz3B1zirL3Otb1gIk6917g==";
};

[root@dns-server mnt]# vim /etc/named.conf 
include "/etc/westos.key";
[root@dns-server mnt]# vim /etc/named.rfc1912.zones 
zone "westos.com" IN {
        type master;
        file "westos.com.zone";
        allow-update { key westos; };   ##允许key westos 更新
};:
[root@dns-server mnt]# systemctl restart named

辅助dns操作

[aaa@qq.com mnt]# nsupdate -k /mnt/Kwestos.+157+28134.private
> server 172.25.254.109        
> update delete www.westos.com
> send
> quit

可以在主dns上测试
（5）ddns
ddns=dhcp+dns
动态dns需要dhcp与dns的协同工作
这里dns所需要的bind6以上的版本，以及dhcp需要3.0以上版本。在操作以前要把原来的westos.com.zone恢复，以免影响后续操作。

主dns设置 
yum install dhcp -y
systemctl start dhcpd
systemctl stop firewalld
setenforce 0
cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcp.conf
vim /etc/dhcp/dhcp.conf 
      7 option domain-name "westos.com";
      8 option domain-name-servers 172.25.254.117;
     13 # Use this to enble / disable dynamic dns updates globally.
     14 ddns-update-style interim;
      ##删除27，28行
     subnet 172.25.254.0 netmask 255.255.255.0 {
      range 172.25.254.110 172.25.254.120;
      option routers 172.25.254.117;
    }
    key westos {
        algorithm hmac-md5;
        secret Lz3B1zirL3Otb1gIk6917g==;
    };
    zone westos.com. {
    primary 127.25.254.117;
    key westos
    }
systemctl restart dhcpd
systemctl restart named
辅助dns上的设置
hostnamectl set-hostname hello.westos.com
vim /etc/sysconfig/network-scripts/ifcfg-eth0
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
PEERDNS=yes
IPV6INIT=no
PERSISTENT_DHCLIENT=1
systemctl restart network

测试:systemctl restart network获取ip地址
dig hello.westos.com

dns第二部分集群