What is localhost?

localhost is a networking term; it’s the hostname for the loopback network interface of whichever server it’s said in reference to (meaning every server has a ‘localhost‘). The loopback interface bypasses any local network interface hardware, and serves as a method to connect back to the server itself. The term localhost is used often in both networking and in server administration.

IPv4 Localhost

The IPv4 address for localhost, or the loopback network interface, is 127.0.0.1.

IPv6 Localhost

The IPv6 address for localhost, or the loopback network interface, is ::1.

Error: (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80 on Ubuntu [SOLVED]

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  • These instructions are intended specifically for solving the error: (98)Address already in use: make_sock: could not bind to address 0.0.0.0:80
  • I’ll be working from both Liquid Web Core Managed Ubuntu 12.04 LTS and 14.04 LTS servers, and I’ll be logged in as root.

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Error: /usr/sbin/ifconfig: No such file or directory [SOLVED]

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  • I’ll be working from a Liquid Web Self Managed CentOS 7 server, and I’ll be logged in as root.

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