DHCP服务器

http://ming228.blog.51cto.com/421298/110659

[root@localhost zzx]# rpm -qa |grep dhcp
dhcp-libs-4.2.5-27.el7.centos.2.x86_64
dhcp-common-4.2.5-27.el7.centos.2.x86_64

[root@localhost zzx]# yum install dhcp

已安装:
  dhcp.x86_64 12:4.2.5-27.el7.centos.2                                         

完毕！

[root@localhost zzx]# rpm -qa |grep dhcp
dhcp-4.2.5-27.el7.centos.2.x86_64
dhcp-libs-4.2.5-27.el7.centos.2.x86_64
dhcp-common-4.2.5-27.el7.centos.2.x86_64

[root@localhost dhcp-4.2.5]# cp /usr/share/doc/dhcp-4.2.5/dhcpd.conf.example /etc/dhcp.conf  #拷贝配置文件到etc下（  正确位置应该是 /etc/dhcp/dhcpd.conf    再次验证放/etc/dhcp.cof是无法启动的）

修改文件内容  

subnet 192.168.56.0 netmask 255.255.255.0 {   //dhcp网段和掩码
  range 192.168.56.150 192.168.56.180;  //dhcp范围
  option domain-name-servers 8.8.8.8;   //dns服务器地址
  option routers 192.168.56.1;   //客户端默认路由
}

 host zabbix-PC {  //ns的名字随便设置一个  不固定 就是一个计算机名      设置好固定ip需要重启dhcpd服务
  hardware ethernet 00:0C:29:9A:33:bb;  //需要设置固定ip的电脑的mac地址
  fixed-address 192.168.56.22;   //固定ip
 }

          

 按教程把配置文件考到/etc/下  结果启动时失败   提示 See 'systemctl status dhcpd.service''               运行systemctl status dhcpd.service'    提示   Loaded: loaded (/usr/lib/systemd/system/dhcpd.service; disabled)   打开 /usr/lib/systemd/system/dhcpd.service    提示ExecStart=/usr/sbin/dhcpd -f -cf /etc/dhcp/dhcpd.conf -user dhcpd -group dhcpd --no-pid  原来是位置不对   正确位置应该是 /etc/dhcp/dhcpd.conf

接着启动 

[root@localhost zzx]# service dhcpd restart         #修改文件内容后需要重启服务  否则无法生效        别把dhcpd和named搞混了                     
Redirecting to /bin/systemctl restart  dhcpd.service

ps aux |grep dhcp   看到多了一项 dhcpd     7521  0.0  1.8 109256 18220 ?        Ss   10:45   0:00 /usr/sbin/dhcpd -f -cf /etc/dhcp/dhcpd.conf -user dhcpd -group dhcpd --no-pid

说明启动成功

 /var/lib/dhcpd/dhcpd.leases  临时租期数据库被写入 dhcpd.leases 文件

[root@nginx ~]# cat /var/lib/dhcpd/dhcpd.leases
# The format of this file is documented in the dhcpd.leases(5) manual page.
# This lease file was written by isc-dhcp-4.1.1-P1

server-duid "0001000137Pdv0014)|"306";

lease 192.168.1.5 {
starts 3 2016/08/24 13:58:25;
ends 3 2016/08/24 14:08:25;
cltt 3 2016/08/24 13:58:25;
binding state active;
next binding state free;
hardware ethernet 68:3e:34:48:1e:52;
client-hostname "zzx";
}

简单的dhcp 服务器(多vlan)

三层交换机配置多VLAN和DHCP服务器实例