002.DHCP配置

  1 yum -y install dhcp

  1 option domain-name #设置所在的DNS域
  2 
  3 option domain-name-servers #设置DNS服务器地址
  4 
  5 default-lease-time #设置默认租约时间，单位为秒
  6 
  7 max-lease-time #设置最大租约时间，单位为秒
  8 
  9 ddns-update-style #设置DNS的更新方式，通常不配
 10 
 11 authoritative #标识权威服务器，多台中生效的标识
 12 
 13 log-facility local7 #日志发送到local7日志服务中

  1 option domain-name-servers 61.153.177.198,223.5.5.5; #全局下DNS配置
  2 
  3 default-lease-time 7200; #全局下最小租约时间
  4 
  5 max-lease-time 14400; #全局下最大租约时间
  6 
  7 subnet 192.168.10.0 netmask 255.255.255.0 { #设置网段
  8 
  9 range 192.168.10.11 192.168.10.254; #设置可分配地址池
 10 
 11 option domain-name-servers 61.153.177.198, 223.5.5.5 #可在全局下配置，对全局生效，亦可在subnet下配置，只对特定subnet生效
 12 
 13 option routers 192.168.10.2; #设定网关
 14 
 15 option broadcast-address 192.168.10.255; #广播
 16 
 17 }

  1 [root@server dhcp]service dhcpd restart #centos6.*系列命令
  2 
  3 [root@server dhcp]systemctl restart dhcpd #centos7系列命令

  1 TYPE=Ethernet
  2 
  3 BOOTPROTO=dhcp
  4 
  5 DEFROUTE=yes
  6 
  7 NAME=eth0
  8 
  9 ONBOOT=yes

  1 [root@client ~]systemctl restart network

  1 [root@server dhcp]# cat /var/lib/dhcpd/dhcpd.leases
  2 
  3 # The format of this file is documented in the dhcpd.leases(5) manual page.
  4 
  5 # This lease file was written by isc-dhcp-4.2.5
  6 
  7 server-duid "\000\001\000\001\037S(\244\000\014)\371Xn";
  8 
  9 lease 192.168.10.11 {
 10 
 11 starts 5 2016/08/26 16:25:24;
 12 
 13 ends 5 2016/08/26 18:25:24;
 14 
 15 cltt 5 2016/08/26 16:25:24;
 16 
 17 binding state active;
 18 
 19 next binding state free;
 20 
 21 rewind binding state free;
 22 
 23 hardware ethernet 00:50:56:36:ad:b9;
 24 
 25 client-hostname "imxhy";
 26 
 27 }

  1 tail -n +4 /var/lib/dhcpd/dhcpd.leases | less | grep -v 'server-duid' | awk 'BEGIN{RS=ORS="}"}{print $2,$25,$29"\n"}' | sed 's/}//g' | sed 's/;//g' | sed 's/"//g' | sort -n | column -t