How to Allow Non-root Process to Bind to Low-numbered Ports

Use CAP_NET_BIND_SERVICE to grant low-numbered port access to a process:

With this you can grant permanent access to a specific binary to bind to low-numbered ports via the setcap command:

For more details on the e/i/p part, see cap_from_text.

After doing this, /path/to/binary will be able to bind to low-numbered ports. Note that you must use setcap on the binary itself rather than a symlink.

FROM:

https://superuser.com/questions/710253/allow-non-root-process-to-bind-to-port-80-and-443