#/etc/init.d/httpd restart
Stopping httpd:                                            [FAILED]
Starting httpd: (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
                                                           [FAILED]

用netstat察看80端口的情况：
# netstat -tulpn| grep :80

如果 80端口被 httpd 占用，全杀：
# killall -9 httpd

重启Apache：
# /etc/init.d/httpd start