修复 vagrant plugin install 失败问题

由于最近重装了系统，需要重新搭建homestead+laravel环境。安装Virutal Box 6.0.0, Vagrant 2.2.2, 然后执行vagrant plugin install vagrant-winnfsd时报错：

Installing the 'vagrant-winnfsd' plugin. This can take a few minutes...
C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:834:in `connect':
 The requested address is not valid in its context. - connect(2) for "0.0.0.0" p
ort 53 (Errno::EADDRNOTAVAIL)
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:834:
in `block in lazy_initialize'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:826:
in `synchronize'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:826:
in `lazy_initialize'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:846:
in `sender'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:525:
in `block in fetch_resource'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:1133
:in `block (3 levels) in resolv'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:1131
:in `each'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:1131
:in `block (2 levels) in resolv'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:1130
:in `each'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:1130
:in `block in resolv'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:1128
:in `each'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:1128
:in `resolv'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:520:
in `fetch_resource'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:510:
in `each_resource'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/resolv.rb:491:
in `getresource'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/rubygems/remot
e_fetcher.rb:105:in `api_endpoint'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/rubygems/sourc
e.rb:47:in `api_uri'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/rubygems/sourc
e.rb:183:in `load_specs'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/bundler.rb:424:in `block in validate_configured_sources!'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/rubygems/sourc
e_list.rb:98:in `each'
        from C:/HashiCorp/Vagrant/embedded/mingw64/lib/ruby/2.4.0/rubygems/sourc
e_list.rb:98:in `each_source'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/bundler.rb:422:in `validate_configured_sources!'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/bundler.rb:330:in `internal_install'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/bundler.rb:128:in `install'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/plugin/manager.rb:138:in `block in install_plugin'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/plugin/manager.rb:148:in `install_plugin'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/plugins
/commands/plugin/action/install_gem.rb:30:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/action/builder.rb:116:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/action/runner.rb:66:in `block in run'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/util/busy.rb:19:in `busy'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/action/runner.rb:66:in `run'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/plugins
/commands/plugin/command/base.rb:14:in `action'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/plugins
/commands/plugin/command/install.rb:70:in `block in execute'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/plugins
/commands/plugin/command/install.rb:69:in `each'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/plugins
/commands/plugin/command/install.rb:69:in `execute'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/plugins
/commands/plugin/command/root.rb:66:in `execute'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/cli.rb:54:in `execute'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/lib/vag
rant/environment.rb:291:in `cli'
        from C:/HashiCorp/Vagrant/embedded/gems/2.1.5/gems/vagrant-2.1.5/bin/vag
rant:164:in `<main>'

搜索The requested address is not valid in its context. connect(2) for "0.0.0.0" port 53 (Errno::EADDRNOTAVAIL)，看这篇文章vagrant up fail in 1.9.3 on windows10，但这是已经添加box后的操作了，没什么帮助。

既然说连不上0.0.0.0:53，看下网络状态： netstat -ano，有一行

UDP 0.0.0.0:53 *:* 10144

说明是有程序在监听这个UDP端口的。思路中断，看其他文章。

再看这篇Installing gem error (EADDRNOTAVAIL)，有网友说是DNS出问题了。

又看到这一篇ERROR: While executing gem … (Errno::EADDRNOTAVAIL)The requested address is not valid in its context. - connect(2) for “0.0.0.0” port 53，作者说：

Looks like your DNS resolver address is set to 0.0.0.0, so that the name resolution fails. Check your network settings!

蛤？

想到以前启用HyperV虚拟机、配置网络时会生成一个新的虚拟网卡 vEthernet (New Virtual Switch)，大部分 IPv4 设置沿用之前的网卡设置，但是 DNS 一栏会给置空。

我最近这次重装系统后也启用过 HyperV 一阵子了，可以正常上网就忘掉有这回事，或许是这个问题？打开一看果然，DNS 栏空空如也，填写两个 DNS server： 192.168.1.1, 114.114.114.114，再次运行 vagrant plugin install vagrant-winnfsd，终于成功：

C:\Users\capta>vagrant plugin install vagrant-winnfsd
Installing the 'vagrant-winnfsd' plugin. This can take a few minutes...
Fetching: vagrant-winnfsd-1.4.0.gem (100%)
Installed the plugin 'vagrant-winnfsd (1.4.0)'!

这算什么破问题，搞了两个下午。。。

用过virtual box 6.0.0 和 5.2.22，Vagrant 2.2.2 和 2.1.5，结果他们都没问题，是我系统环境有问题！

2019年1月11日00:07:30 增补

卧槽vbox和hyperv不能共存。。。那我重装系统之前咋用的？噢，很久以前玩过hyperv后来关了，所以上次搭建homestead环境没出问题。然后再启用hyperv，毕竟微软自家儿子，还可以正常用，但是！这段时间直到我重装系统，我都没有再用过vbox了！。。。

参考hyper-v disables vt-x for other hypervisors 和 Turning hyper-v on and off，设置机器启动时是否开启hyperv：

开启 bcdedit /set hypervisorlaunchtype auto start
关闭 bcdedit /set hypervisorlaunchtype off

修复 vagrant plugin install 失败问题

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修复 vagrant plugin install 失败问题

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