CentOS7 安裝DHCP服務並啟用DHCP failover

1. 安裝dhcp服務

yum install -y dhcp

2. host1

vi /etc/dhcp/dhcpd.failover

failover peer "dhcpfailover" {
        primary;
        address host1;
        port 647;
        peer address host2;
        peer port 647;
        max-response-delay 60;
        max-unacked-updates 10;
        mclt 1800;
        split 128;
        load balance max seconds 3;
}

vi /etc/dhcp/dhcpd.conf

include "/etc/dhcp/dhcpd.failover";

default-lease-time 600;
max-lease-time 7200;
ddns-update-style none;
authoritative;
allow booting;
allow bootp;
option domain-name-servers      ns1, ns2;

subnet 192.168.1.0 netmask 255.255.255.0 {
        option routers    192.168.1.1;
        option subnet-mask 255.255.255.0;
        pool{
                failover peer "dhcpfailover";
                range 192.168.1.50 192.168.1.150;
        }
}

3. host2

vi /etc/dhcp/dhcpd.failover

failover peer "dhcpfailover" {
        secondary;
        address host2;
        port 647;
        peer address host1;
        peer port 647;
        max-response-delay 60;
        max-unacked-updates 10;
        #mclt 1800;
        #split 128;
        load balance max seconds 3;
}

從host1下載dhcpd.conf

scp host1:/etc/dhcp/dhcpd.conf /etc/dhcp/

4. 開通所需要的防火牆政策

firewall-cmd --permanent --zone=public --add-port=647/tcp

firewall-cmd --permanent --zone=public --add-port=67/udp

5. 啟用dhcp服務

systemctl enable dhcpd
systemctl start dhcpd

6. 確認IP租用狀態

tail -n 30 /var/lib/dhcp/dhcpd.lease