centos7 VM VirtualBox设置共享目录时报错。 /sbin/mount.vboxsf: mounting failed with the error: No such device

 执行  mount -t vboxsf workspace /mnt/workspace

解决办法：

yum clean all
yum update
yum install kernel
yum install kernel-devel
yum install kernel-headers
yum install gcc
yum install make  
reboot


cd /opt/VBoxGuestAdditions-*/init  
./vboxadd setup
reboot