[系统运维]在ensp里用centos7做DHCP服务器

1.做好桥接云，桥接到centos 7 服务器上

2.利用华为模拟器做一个简单的局域网

3.交换机的配置

接入层交换机：

interface Ethernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094

interface Ethernet0/0/2
port link-type access
port default vlan 10

interface Ethernet0/0/3
port link-type access
port default vlan 10

核心交换机：

要在全局下开启DHCP功能 【】 dhcp enable

interface Vlanif10
ip address 192.168.10.1 255.255.255.0
dhcp select relay
dhcp relay server-ip 192.168.100.2

interface Vlanif20
ip address 192.168.20.1 255.255.255.0
dhcp select relay
dhcp relay server-ip 192.168.100.2

interface Vlanif30
ip address 192.168.100.1 255.255.255.0

interface GigabitEthernet0/0/1
port link-type trunk
port trunk allow-pass vlan 2 to 4094

interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 2 to 4094

interface GigabitEthernet0/0/3
port link-type access
port default vlan 30

4.centos 7的准备工作

①在全局下新建一个网络，并使用桥接模式（必须是在ensp里桥接的网卡）

②在虚拟机设置里选择自定义网络（刚刚创建的）

③手动配置centos 7的IP地址（这里设为192.168.100.2）

5.在centos 7 上下载dhcp，并配置

①下载DHCP

 yum install -y dhcp

②配置DHCP的配置文件 /etc/dhcp/dhcpd.conf
其中域名可以删掉

log-facility local7;

subnet 192.168.10.0  netmask 255.255.255.0 {
  range 192.168.10.100  192.168.10.200;                                 
  option domain-name-servers  114.114.114.114;                   
  option domain-name "ddblog.xyz";                               
  option routers 192.168.10.1;                                      
  option broadcast-address 192.168.10.255;                          
  default-lease-time 300;                                        
  max-lease-time 7200;                                          
}

subnet 192.168.10.0  netmask 255.255.255.0 {
  range 192.168.10.20  192.168.10.200;                           ##地址池 
  option domain-name-servers  114.114.114.114;                   ##DNS服务器地址
  option domain-name "ddblog.xyz";                               ##域名
  option routers 192.168.10.1;                                   ##默认路由
  option broadcast-address 192.168.10.255;                       ##广播地址
  default-lease-time 300;                                        ##默认租约时间 
  max-lease-time 7200;                                           ##最大租约时间 
}

③启动DHCP服务

systemctl start dhcpd

6.其他

      rpm -ql dhcp    #查看dhcp包安装了哪些文件和程序
      /etc/dhcpd.conf                                           #主配置文件
      /etc/rc.d/init.d/dh                                        #服务启动脚本
      /etc/rc.d/init.d/dhcrelay                                  #继dhcp服务启动脚本
      /etc/sysconfig/dhcpd                                       #次要配置文件
      /etc/sysconfig/dhcrelay
      /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example               #示例文件
      /ust/lib/systemd/system/dhcpd.services                     # 服务启动脚本 
      /var/lib/dhcpd/dhcpd.leases                                #租约信息存放的文件
      /var/lib/dhclient/dhclient.leases          	 #客户端租约文件
      /var/lib/dhcpd/dhcpd.leases               	#服务器端的租约文件在
      /etc/dhcp/dhcpd.conf                          #dhcp配置文件

7.结果展示

博客地址 https://www.ddblog.xyz/articles/56