如何解决httpd启动中遇到的问题

今天在安装HTTP服务时出现如下错误提示：

1. [root@localhost ~]# service httpd start
2. Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName

1. (98)Address already in use: make_sock: could not bind to address [::]:80
2. (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80

1. no listening sockets available, shutting down
2. Unable to open logs

[FAILED]

如上错误有两部分错误：
Starting httpd: httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName
分析：
这个问题是由于/etc/httpd/conf/httpd.conf文件中设置了 ServerName 所以它就用主机上的名称来取代，这样的话先去找/etc/hosts 中有沒有主机的定义。
解决方法：
所以要解决这个问题可以设置 ServerName 或者在 /etc/hosts 中填入自己的主机名称 datacentersky，如下：

vi /etc/hosts
127.0.0.1 localhost.localdomain localhost datacentersky

2. 第二个错误：

1. (98)Address already in use: make_sock: could not bind to address [::]:80
2. (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80