Feb 3 09:12:32 dhcphost dhcpd: Internet Systems Consortium DHCP Server 4.1.1-P1
Feb 3 09:12:32 dhcphost dhcpd: Copyright 2004-2010 Internet Systems Consortium.
Feb 3 09:12:32 dhcphost dhcpd: All rights reserved.
Feb 3 09:12:32 dhcphost dhcpd: For info, please visit
Feb 3 09:12:32 dhcphost dhcpd: Not searching LDAP since ldap-server, ldap-port and ldap-base-dn were not specified in the config file
Feb 3 09:12:32 dhcphost dhcpd: Can't chown new lease file: Operation not permitted
Feb 3 09:12:32 dhcphost dhcpd:
Feb 3 09:12:32 dhcphost dhcpd: This version of ISC DHCP is based on the release available
Feb 3 09:12:32 dhcphost dhcpd: on ftp.isc.org. Features have been added and other changes
Feb 3 09:12:32 dhcphost dhcpd: have been made to the base software release in order to make
Feb 3 09:12:32 dhcphost dhcpd: it work better with this distribution.
Feb 3 09:12:32 dhcphost dhcpd:
Feb 3 09:12:32 dhcphost dhcpd: Please report for this software via the CentOS Bugs Database:
Feb 3 09:12:32 dhcphost dhcpd:
Feb 3 09:12:32 dhcphost dhcpd:
Feb 3 09:12:32 dhcphost dhcpd: exiting.
其中这一行引起注意
Feb 3 09:12:32 dhcphost dhcpd: Can't chown new lease file: Operation not permitted
于是检查 /etc/rc.d/init.d/dhcpd 文件，发现其中有如下两行定义了启动dhcp的user和group
user=dhcpd
group=dhcpd
想到上面提到的用 "sudo service dhcpd start" 不能启动而用 "sudo dhcp" 可以启动，想到可能是用户权限问题，于是把这两个参数修改为：
user=root
group=root
然后再使用 "sudo service dhcpd start" 启动DHCP，问题解决。
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