My guide for setting up a great web development environment on your Mac, which was originally written with OS X 10.8 (Mountain Lion) in mind, updated for Mavericks, and then overhauled for Yosemite, has now been confirmed—by me—to work with macOS High Sierra (10.13).

If you had previously used my tutorial, and upon upgrading to High Sierra, your localhost has stopped working, it’s likely that you may need to restore your Apache config files.

When the High Sierra updater runs, it replaces your edited Apache configuration files with the default ones, wiping out any changes you have made. The good news is that there is a back up of your config files.

Running the following commands will restore your previous Apache configuration, and restart apache:

This alone should restore your settings, and kick start your old environment under High Sierra, but if you’re using PHP, there’s another step. High Sierra comes with PHP7, so you need to alter a few lines from your Apache configuration.

168  LoadModule rewrite_module libexec/apache2/mod_rewrite.so
169  LoadModule php5_module libexec/apache2/libphp5.so
170  #LoadModule perl_module libexec/apache2/mod_perl.so

becomes

168  LoadModule rewrite_module libexec/apache2/mod_rewrite.so
169  LoadModule php7_module libexec/apache2/libphp7.so
170  #LoadModule perl_module libexec/apache2/mod_perl.so

Then restart apache and you should be good to go.

If you have not yet upgraded, I would encourage you to first make your own backup of your config file, just in case your upgrade fails, and you need to start from scratch.