apache重启报错：Address already in use: make_sock: could not bind to address的解决
今天配置了apache的多虚拟主机，基于端口的，基于IP的，基于域名的，都配置了，这些测试也成功。之后，就接着配置多虚拟主机的mod_expires，关于mod_expires的文件就不贴在这里了，网上很多，类似的。
可是配置了之后，对apache进行apache优雅重启，但是报错如下：
[*]# /application/apache2.2.23/bin/apachectl graceful
[*]httpd not running, trying to start
[*](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
仔细检查，没发现配置方面的错误，包括主配置文件，虚拟机配置文件都正确。
报错信息的提示是，端口已经在使用了，不能绑定到指定的端口上。
仔细想想，已经有apache在启动了，用ps查进程，再杀掉。
[*]# ps -ef | grep httpd
[*]root 367728780 18:35 pts/1 00:00:00 grep httpd
[*]root 5536 10 10:44 ? 00:00:00 /application/apache2.2.23/bin/httpd -k start
[*]daemon 1020355360 11:45 ? 00:00:00 /application/apache2.2.23/bin/httpd -k start
[*]daemon 1020455360 11:45 ? 00:00:00 /application/apache2.2.23/bin/httpd -k start
[*]daemon 1020655360 11:45 ? 00:00:00 /application/apache2.2.23/bin/httpd -k start
[*]daemon 1020855360 11:45 ? 00:00:00 /application/apache2.2.23/bin/httpd -k start
[*]daemon 1030055360 11:46 ? 00:00:00 /application/apache2.2.23/bin/httpd -k start
[*]# killall httpd
#
#
再进行apache优雅重启，正常了，测试mod_expires（可以看到，已经为html文件生成缓存了），OK。
[*]# curl -I 192.168.88.128:8081
[*]HTTP/1.1 200 OK
[*]Date: Sun, 02 Dec 2012 10:41:04 GMT
[*]Server: Apache/2.2.23 (Unix) DAV/2
[*]Last-Modified: Sun, 02 Dec 2012 03:10:51 GMT
[*]ETag: "2d802d-63-4cfd5fae2e4c0"
[*]Accept-Ranges: bytes
[*]Content-Length: 99
[*]Cache-Control: max-age=31104000
[*]Expires: Wed, 27 Nov 2013 10:41:04 GMT
[*]Content-Type: text/html
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