解决flag to force provisioning. Provisioners marked to run always will still run.

解决办法：

此报错一般是修改了Homestead.yaml文件之后，使用vagrant reload或者vagrant up命令之后产生的错误，

先使用vagrant provision重新构建配置之后，再reload 即可

如果还是报错，使用 vagrant global-status命令查看是否已经有虚拟机在运行，再vagrant ssh 虚拟机ID

进行连接

报错信息：

ilaptop@ilaptop MINGW64 ~/Homestead ((v7.6.0))
$ vagrant reload
==> homestead-7: Attempting graceful shutdown of VM...
==> homestead-7: Checking if box 'laravel/homestead' is up to date...
==> homestead-7: Clearing any previously set forwarded ports...
==> homestead-7: Clearing any previously set network interfaces...
==> homestead-7: Preparing network interfaces based on configuration...
    homestead-7: Adapter 1: nat
    homestead-7: Adapter 2: hostonly
==> homestead-7: Forwarding ports...
    homestead-7: 80 (guest) => 8000 (host) (adapter 1)
    homestead-7: 443 (guest) => 44300 (host) (adapter 1)
    homestead-7: 3306 (guest) => 33060 (host) (adapter 1)
    homestead-7: 4040 (guest) => 4040 (host) (adapter 1)
    homestead-7: 5432 (guest) => 54320 (host) (adapter 1)
    homestead-7: 8025 (guest) => 8025 (host) (adapter 1)
    homestead-7: 27017 (guest) => 27017 (host) (adapter 1)
    homestead-7: 22 (guest) => 2222 (host) (adapter 1)
==> homestead-7: Running 'pre-boot' VM customizations...
==> homestead-7: Booting VM...
==> homestead-7: Waiting for machine to boot. This may take a few minutes...
    homestead-7: SSH address: 127.0.0.1:2222
    homestead-7: SSH username: vagrant
    homestead-7: SSH auth method: private key
==> homestead-7: Machine booted and ready!
==> homestead-7: Checking for guest additions in VM...
==> homestead-7: Setting hostname...
==> homestead-7: Configuring and enabling network interfaces...
==> homestead-7: Mounting shared folders...
    homestead-7: /vagrant => C:/Users/ilaptop/Homestead
    homestead-7: /home/vagrant/code => C:/Users/ilaptop/Code
==> homestead-7: Machine already provisioned. Run `vagrant provision` or use the `--provision`
==> homestead-7: flag to force provisioning. Provisioners marked to run always will still run.

命令说明：

摘抄自：https://github.com/astaxie/go-best-practice/blob/master/ebook/zh/01.3.md

vagrant provision：

通常情况下Box只做最基本的设置，而不是设置好所有的环境，因此Vagrant通常使用Chef或者Puppet来做进一步的环境搭建。那么Chef或者Puppet称为provisioning，而该命令就是指定开启相应的provisioning。按照Vagrant作者的说法，所谓的provisioning就是"The problem of installing software on a booted system"的意思。除了Chef和Puppet这些主流的配置管理工具之外，我们还可以使用Shell来编写安装脚本。

我自己对vagrant provision的理解是：修改了Homestead.yaml文件，需要使用vagrant provision命令重新构建配置

vagrant reload：

重新启动虚拟机，主要用于重新载入配置文件

vagrant reload=vagrant halt&vagrant up