対応方法：
— 01.01 apache 起動する
[root@datagrp oracle]# /usr/local/apache2/bin/apachectl start
(98)Address already in use: make_sock: could not bind to address [::]:80
no listening sockets available, shutting down
Unable to open logs
— 01.02 apacheの使用状況確認
[apadmin@datagrp conf]$ /usr/sbin/lsof -i | grep http
httpd 2493 root 3u IPv6 5477 TCP *:http (LISTEN)
httpd 17787 apache 3u IPv6 5477 TCP *:http (LISTEN)
httpd 17788 apache 3u IPv6 5477 TCP *:http (LISTEN)
httpd 17789 apache 3u IPv6 5477 TCP *:http (LISTEN)
httpd 17790 apache 3u IPv6 5477 TCP *:http (LISTEN)
httpd 17791 apache 3u IPv6 5477 TCP *:http (LISTEN)
httpd 17792 apache 3u IPv6 5477 TCP *:http (LISTEN)
httpd 17793 apache 3u IPv6 5477 TCP *:http (LISTEN)
httpd 17794 apache 3u IPv6 5477 TCP *:http (LISTEN)
—※プロセス2493～17794が apacheを使っている模様。
— 01.03 プロセスを停止する
kill 2493
kill 17787
…
kill 17794
— 01.04 apacheを起動する
[root@datagrp oracle]# /usr/local/apache2/bin/apachectl start
