PHP’s open_basedir is one way I isolate the various PHP applications running on my VPS. Within the directory that holds this WordPress install, there exists a symlink from when I relocated my presentation slides from http://ethitter.com/slides/ to https://slides.ethitter.com/. VaultPress doesn’t particularly appreciate this:
PHP Warning: file_exists(): open_basedir restriction in effect. File(/.../network/public_html/slides) is not within the allowed path(s).
Letting VaultPress access the directory that the symlink points to would defeat the purpose of using open_basedir, so instead, my VPS continually frustrates VaultPress.