service httpd restart 重启APACHE失败解决

现象：

# service httpd restart
Stopping httpd:                                            [FAILED]
Starting httpd: [Mon Mar 04 04:05:12 2013] [warn] module limitipconn_module is already loaded, skipping
httpd: Could not reliably determine the server's fully qualified domain name, using Xfor ServerName
[Mon Mar 04 04:05:12 2013] [warn] NameVirtualHost *:443 has no VirtualHosts
[Mon Mar 04 04:05:12 2013] [warn] NameVirtualHost *:80 has no VirtualHosts
(98)Address already in use: make_sock: could not bind to address [::]:80
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down
Unable to open logs

~~~~~~~

原因：

Normally a "could not bind to address" error means that another process 
is bound to port 80 preventing Apache from starting up on that port. 
This can happen if you are you using a caching server or another web 
server that is also using port 80, If this is the case, stop this 
alternate process and try restarting Apache again.

解决链接：

http://stackoverflow.com/questions/9757599/apache-restart-failed

要用到KILL命令，我开始找的PKILL或是KILL PROC命令在CENTOS下并不通用。

~~~~~~~~~~~

首先，确定HTTPD的PID。

 ps -ef|grep httpd
root      2213     1  0 Mar02 ?        00:00:39 /usr/sbin/httpd
apache    7641  2213  2 03:16 ?        00:01:09 /usr/sbin/httpd
。。。
apache   11050  2213  2 04:05 ?        00:00:03 /usr/sbin/httpd

显然，parent httpd process id为2213。

然后，kill 2213

再运行service httpd start,

搞定，收工。