[Apache] apache無法啟動: make_sock: could not bind to address 0.0.0.0:80 no listening sockets available

發現VM的apache無法啟動，噴了一些
make_sock: could not bind to address 0.0.0.0:80 no listening sockets available的錯誤，找到這篇wiki https://wiki.apache.org/httpd/CouldNotBindToAddress

可能是有其他process程式佔住port或不是root的權限(Unix based systems disallow non-root users to bind processes to port numbers below 1024. Get root!)

不過最後下了apachectrl start就開啟了....