空主机头千万不要做CNAME记录，它会导致整个域名解析不正常。

[root@linux9da log]# less /var/log/messages | grep test.com

Sep 10 18:05:19 linux9da named[1204]: dns_master_load: test.zone:15: test.com: CNAME and other data
Sep 10 18:05:19 linux9da named[1204]: zone test.com/IN: loading from master file test.zone failed: CNAME and other data