In case having problem with Vagrant Sync folders...
After being stuck with vagrant that sync-folders are not synced on vagrant up, I seem to find a way to fix it. Here is the way I tried. * host-os: OSX Yosemite & guest-os: CentOS6 1. Install vagrant guest plugin. vagrant plugin install vagrant-vbguest 2. update kernel on vagrant's guest. sudo yum install kernel-devel sudo yum update kernel* 3. exit guest and reload vagrant. vagrant reload