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Apache起動時に他のプロセスのポートと被ってエラーが出た場合

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apacheを起動しようとして

service httpd start

すると以下のようなエラーが

 httpd: Could not reliably determine the server's fully qualified domain name, using localhost.localdomain for ServerName
(98)Address already in use: make_sock: could not bind to address [::]:80
(98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
no listening sockets available, shutting down

他のプロセスがそのポート(上記の場合80)を使ってるので、
そのプロセスをkillしてやる。
以下のコマンドで被っているプロセスを特定

netstat -lnp | grep :80  

結果

tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      1531/nginx

最後にあるのがプロセス番号なので

kill -9 1531

これで大丈夫なはずだが、もう一度netstatで確認しておく。
そして

service httpd start

で無時起動

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