service httpd start
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

这是启动apache发生的错误，是监听80端口的问题，解决办法：

1. 打开httpd.conf
2. 找到：
   

   # Change this to Listen on specific IP addresses as shown below to # prevent Apache from glomming onto all bound IP addresses (0.0.0.0)

3. 下面的Listen这一行修改为：
   

   Listen 127.0.0.1:80