错误：
httpd: apr_sockaddr_info_get() failed for web.keke.com
httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName
解决方法：
1.修改hosts：
     vi /etc/hosts
127.0.0.1   web.keke.com   web   localhost.localdomain   localhost 
2. 修改network：
     vi /etc/sysconfig/network
HOSTNAME=web.keke.com                                              
3. 修改Apache的http.conf：
     vi /usr/local/apache/conf/httpd.conf
ServerName 127.0.0.1:80