Centos 7 dhcp集群搭建

dhcp集群搭建
一、两台centos7安装dhcp服务,并设定开机自启
yum install dhcp -y
systemctl enable dhcpd
二、编辑dhcpd.conf配置文件
1、primary服务器：
vim /etc/dhcp/dhcpd.conf

ddns-update-style none;       #dhcp不更新dns
default-lease-time 7200;      #默认的地址租约，单位秒
max-lease-time 14400;         #最大的地址租约，单位秒
option domain-name-servers 114.114.114.114;
option domain-name "cmsk1979.local";         #dns的后缀
failover peer "dhcp" {
 primary;
 address 192.168.243.130;
 port 67;
 peer address 192.168.243.129;
 peer port 67;
 max-response-delay 60;   #同步信息最大时间延迟
 max-unacked-updates 10;  #在未收到 PARTNER 回复时，BNDUPD 消息的最多重发次数
 mclt 7200;               #Maximum Client Lead Time. 在灾备方案中，该时间延迟保证 PARTNER 上的 IP 租约已经过期，注：该参数只能定义在主服务器中
 split 128;               #以24位的子网，主辅服务器的地址分割，通常是各一半，128个ip地址
 load balance max seconds 3;  
}
include "/etc/dhcp/dhcpd.master";  
~                                  

vim /etc/dhcp/dhcpd.master

subnet 192.168.243.0 netmask 255.255.255.0 {
  option routers 192.168.243.2;
  pool {
    range 192.168.243.10 192.168.243.20;
    failover peer "dhcp";
    deny dynamic bootp clients;
  }
  host host1 {
    hardware ethernet 00:50:56:C0:00:01;
    fixed-address 192.168.243.18;
  }
}

2、secondary服务器：

vim /etc/dhcp/dhcpd.conf

ddns-update-style none;
default-lease-time 7200;
max-lease-time 14400;
option domain-name-servers 114.114.114.114;
option domain-name "cmsk1979.local";
failover peer "dhcp" {
 secondary;
 address 192.168.243.129;
 port 67;
 peer address 192.168.243.130;
 peer port 67;
 max-response-delay 60;
 max-unacked-updates 10;
 load balance max seconds 3;
}
include "/etc/dhcp/dhcpd.master";
~                                   

vim /etc/dhcp/dhcpd.master

subnet 192.168.243.0 netmask 255.255.255.0 {
  option routers 192.168.243.2;
  pool {
    range 192.168.243.10 192.168.243.20;
    failover peer "dhcp";
    deny dynamic bootp clients;
  }
  host host1 {
    hardware ethernet 00:50:56:C0:00:01;
    fixed-address 192.168.243.18;
  }
}

三、配置定时任务实现两台间的配置文件同步
1、sh-keygen -t rsa 生成秘钥
2、cd /root/.ssh/ && ssh-copy-id -i id_rsa.pub root@192.168.243.129 将密码分发给对应的主机
3、vim dhcp_syc.sh
scp /etc/dhcp/dhcpd.master root@192.168.243.129:/etc/dhcp/
4、master配置计划任务
*/2 * * * * sh dhcp_syc.sh
*/2 * * * * systemctl restart dhcpd
5、secondary配置计划任务
*/2 * * * * systemctl restart dhcpd