systemctl start dhcpd

cp  /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp/dhcpd.conf

  7 option domain-name "server.com"; 
      ##域名:參見/etc/resolv.conf
  8 option domain-name-servers 172.25.10.254;
      ##指定dns服務器，多臺用逗號隔開。
 30 subnet 172.25.10.0 netmask 255.255.255.0 {
      ##指定子網(wǎng)絡及子網(wǎng)掩碼
 31   range 172.25.10.10 172.25.10.20;
      ##指定IP范圍
 32   option routers 172.25.10.254;
 ##指定默認網(wǎng)關
 33 }
 34#### 刪除27,28行，34行及以后

DEVICE=eth0
BOOTPROTO=dhcp
###關鍵部位為dhcp
ONBOOT=yes

systemctl restart network
###在本次試驗，我遇到了如下問題：執(zhí)行該命令報錯，無法通過DHCP服務器獲得ip,解決思路為：DHCP通常是用于局域網(wǎng)內的一個通信協(xié)議，它主要通過客戶端發(fā)送廣播數(shù)據(jù)包給整個物理網(wǎng)段內的所有主機，若局域網(wǎng)內有DHCP服務器時，才會響應客戶端的ip參數(shù)要求。所以DHCP服務器與客戶端應該在同一個物理網(wǎng)段內。整個DHCP數(shù)據(jù)包在服務器與客戶端間的交互情況如下圖(1)：
###所以我猜測是防火墻阻止了數(shù)據(jù)包的傳送
###我采取的解決方法是：
兩臺虛擬機均執(zhí)行命令：
firewall-cmd --permanent --add-service=dhcp
firewall-cmd --reload 
查看dhcp是否通行：
firewall-cmd --list-all
重啟虛擬機后問題解決。

# dhcpd.conf
#
# Sample configuration file for ISC dhcpd
#

# option definitions common to all supported networks...
option domain-name "example.org";
option domain-name-servers 192.168.0.199;

default-lease-time 600;
max-lease-time 7200;

# Use this to enble / disable dynamic dns updates globally.
#ddns-update-style none;

# If this DHCP server is the official DHCP server for the local
# network, the authoritative directive should be uncommented.
#authoritative;

# Use this to send dhcp log messages to a different log file (you also
# have to hack syslog.conf to complete the redirection).
log-facility local7;

# No service will be given on this subnet, but declaring it helps the 
# DHCP server to understand the network topology.


# This is a very basic subnet declaration.

subnet 192.168.0.0 netmask 255.255.255.0 {
  range 192.168.0.10 192.168.0.20;
  option routers 192.168.0.199;
}