FreeBSD在重启后，主机名为空。 如何解决？
如何使用DHCP设置主机名？

dhclient脚本

dhclient会不时调用DHCP客户端网络配置脚本。
DHCP客户端使用此脚本在请求地址之前设置每个接口的初始配置，在提供地址后对其进行测试，并在获取租约后设置接口的最终配置。

修改文件/etc/rc.conf：

hostname=""

创建一个新文件/etc/dhclient-enter-hooks

# vi /etc/dhclient-enter-hooks

内容如下：

#!/bin/sh
check_hostname(){
hostname laptop.theitroad.com
}

设置权限：

# chmod +x /etc/dhclient-enter-hooks

重启服务器,或者dhcp

# dhclient iface

dhclient.conf文件示例

/etc/dhclient.conf：

timeout 60;
	   retry 60;
	   reboot 10;
	   select-timeout 5;
	   initial-interval 2;
	   

	   interface "ep0" {
	       send host-name "laptop.theitroad.com";
	       send dhcp-client-identifier 1:0:a0:24:ab:fb:9c;
	       send dhcp-lease-time 3600;
	       supersede domain-name "theitroad.net.in r.theitroad.com r.vsnl.theitroad.net.in";
	       prepend domain-name-servers 127.0.0.1;
	       request subnet-mask, broadcast-address, time-offset, routers,
		       domain-name, domain-name-servers, host-name;
	       require subnet-mask, domain-name-servers;
	       script "/etc/dhclient-script";
	       media "media 10baseT/UTP", "media 10base2/BNC";
	   }

	   alias {
	     interface "ep0";
	     fixed-address 192.5.5.213;
	     option subnet-mask 255.255.255.255;
	   }