If you are using the Vagrant VirtualBox provider, then VirtualBox shared folders are the default synced folder type. These synced folders use the VirtualBox shared folder system to sync file changes from the guest to the host and vice versa.
There is a VirtualBox bug related to
sendfile which can result in corrupted or non-updating files. You should deactivate
sendfile in any web servers you may be running.
© 2010–2017 Mitchell Hashimoto
Licensed under the MPL 2.0 License.