httpd绑定ip有问题 要怎么做?

我apachectl restart

提示
httpd not running, trying to start
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down


要怎么做,,具体什么命令哦,教教偶
linux系统apache2.0