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 

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