Vagrantでmount関連のエラーが出たときの対処法

エラー

~/p/m/batch> vagrant reload
==> default: Attempting graceful shutdown of VM...
==> default: Clearing any previously set forwarded ports...
==> default: Clearing any previously set network interfaces...
==> default: Preparing network interfaces based on configuration...
    default: Adapter 1: nat
    default: Adapter 2: hostonly
==> default: Forwarding ports...
    default: 22 (guest) => 2216 (host) (adapter 1)
==> default: Running 'pre-boot' VM customizations...
==> default: Booting VM...
==> default: Waiting for machine to boot. This may take a few minutes...
    default: SSH address: 127.0.0.1:2216
    default: SSH username: vagrant
    default: SSH auth method: private key
==> default: Machine booted and ready!
[default] GuestAdditions 5.1.20 running --- OK.
==> default: Checking for guest additions in VM...
==> default: Setting hostname...
==> default: Mounting shared folders...
    default: /vagrant => /Users/***/project/minshu/batch
Vagrant was unable to mount VirtualBox shared folders. This is usually
because the filesystem "vboxsf" is not available. This filesystem is
made available via the VirtualBox Guest Additions and kernel module.
Please verify that these guest additions are properly installed in the
guest. This is not a bug in Vagrant and is usually caused by a faulty
Vagrant box. For context, the command attempted was:

mount -t vboxsf -o uid=900,gid=1000 vagrant /vagrant

The error output from the command was:

上記のようなエラーが出る。

対処法

一旦インスタンスの中にsshして、symlinkを貼り直す。

~/p/m/batch> vagrant ssh
Last login: Tue Oct 24 16:06:13 2017 from 10.0.2.2

$ sudo rm /sbin/mount.vboxsf
$ sudo ln -s /usr/lib64/VBoxGuestAdditions/mount.vboxsf /sbin/

一旦exitして、reloadするとうまくいく。

~/p/m/batch> vagrant reload