vagrant upでmountエラーがでる場合の対処法

$vagrant up

これをやると以下のエラーがでる

Failed to mount folders in Linux guest. This is usually beacuse
the "vboxsf" file system is not available. Please verify that
the guest additions are properly installed in the guest and
can work properly. The command attempted was:

mount -t vboxsf -o uid=`id -u vagrant`,gid=`getent group apache | cut -d: -f3`,dmode=777,fmode=777 /vagrant /vagrant
mount -t vboxsf -o uid=`id -u vagrant`,gid=`id -g apache`,dmode=777,fmode=777 /vagrant /vagrant

vboxをリビルドすることで解決できる

$vagrant ssh

$ sudo /etc/init.d/vboxadd setup

Removing existing VirtualBox non-DKMS kernel modules       [  OK  ]
Building the VirtualBox Guest Additions kernel modules
Building the main Guest Additions module                   [  OK  ]
Building the shared folder support module                  [  OK  ]
Building the OpenGL support module                         [  OK  ]
Doing non-kernel setup of the Guest Additions              [  OK  ]
Starting the VirtualBox Guest Additions                    [  OK  ]

それで再起動

$vagrant halt
$vagrant up

これでmountできてる