DNS用来做主机名和IP地址的解析
DHCP用来动态分配IP
这里要做的是，使DHCP在分配IP时，动态更新DNS的解析记录
服务器IP：192.168.0.202
客户端测试IP：192.168.0.240-250
相关阅读：
Linux系统下构建DHCP服务器
CentOS下配置主从DNS服务器以及DHCP下的DDNS
SUSE Linux 11 pxe+DHCP+tftp+ftp 无人值守安装
Linux上一步一步实现DHCP服务器
1、DHCP
[root@dd ~]# yum install dhcp.x86_64 -y
[root@dd ~]# vim /etc/dhcp/dhcpd.conf
参考/usr/share/doc/dhcp*/dhcpd.conf.sample
option domain-name "example.com";
option domain-name-servers 192.168.0.202;
default-lease-time 600;
max-lease-time 7200;
log-facility local7;
subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.240 192.168.0.250;
option routers 192.168.0.1;
}
最后需加入
ddns-update-style interim;
update-conflict-detection false;
key ddns {
algorithm hmac-md5;
secret MARnLjY0Har0LMmn8R/Biw==;
};
zone example.com. {
primary 192.168.0.202;
key ddns;
}
测试DHCP，使用另外一台虚拟机test，ip为自动获取，OK
2、DNS
[root@dd mnt]# yum install bind.x86_64 bind-chroot.x86_64 -y
[root@dd mnt]# dnssec-keygen -a HMAC-MD5 -b 128 -n HOST ddns
[root@dd named]# /etc/init.d/named start
在/var/named/chroot/etc下cp -p rndc.key ddns.key
更改ddns为
key "ddns" {
algorithm hmac-md5;
secret "MARnLjY0Har0LMmn8R/Biw==";
};
更改named.conf
添加include "/etc/ddns.key";
options {
listen-on port 53 { any; }; 监听所有
// 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; }; 允许任何用户访问
recursion yes;
dnssec-enable yes;
dnssec-validation yes;
dnssec-lookaside auto;
/* Path to ISC DLV key */
bindkeys-file "/etc/named.iscdlv.key";
managed-keys-directory "/var/named/dynamic";
};
向named.rfc1912.zones添加
zone "example.com" IN {
type master;
file "example.com.zone";
allow-update { key ddns; };
};
/var/named/复制cp -p named.localhost example.com.zone，写入如下内容：
$TTL 1D
@ IN SOA dd.example.com. root.example.com. (
0 ; serial
1D ; refresh
1H ; retry
1W ; expire
3H ) ; minimum
NS dd.example.com.
dd A 192.168.0.202
ThinkPad A 192.168.0.1
正向解析和动态更新到此就做完了，剩下可以做做反向解析和主从DNS
3、反向PTR记录
[root@dd named]# vim chroot/etc/named.rfc1912.zones
zone "0.168.192.in-addr.arpa" IN {
type master;
file "example.com.ptr";
allow-update { none; };
};