vagrant up するとエラーが出た。(vagrant-hostsupdater)

Vagrantを使用して仮想環境(CentOS7)を作成しようとした際にエラーが発生しました。
暫定対応ではあるものの一旦解決ということでメモします。
テスト環境としてしか使用していないので良いかなぁ。

環境
　VirtualBox：5.1.22r115126
　Vagrant：1.8.6

エラーログ
-------------------------------------
$ vagrant up
Bringing machine 'test' up with 'virtualbox' provider...
==> test: Importing base box 'geerlingguy/centos7'...
==> test: Matching MAC address for NAT networking...
==> test: Checking if box 'geerlingguy/centos7' is up to date...
==> test: Setting the name of the VM: test_test_1497674923638_5926
==> test: Clearing any previously set network interfaces...
==> test: Preparing network interfaces based on configuration...
    test: Adapter 1: nat
    test: Adapter 2: hostonly
==> test: Forwarding ports...
    test: 22 (guest) => 2422 (host) (adapter 1)
    test: 22 (guest) => 2222 (host) (adapter 1)
==> test: Running 'pre-boot' VM customizations...
==> test: Booting VM...
==> test: Waiting for machine to boot. This may take a few minutes...
    test: SSH address: 127.0.0.1:2222
    test: SSH username: vagrant
    test: SSH auth method: private key
    test: Warning: Remote connection disconnect. Retrying...
    test: Warning: Remote connection disconnect. Retrying...
    test: Warning: Remote connection disconnect. Retrying...
==> test: Machine booted and ready!
==> test: Checking for guest additions in VM...
==> test: [vagrant-hostsupdater] Checking for host entries
==> test: [vagrant-hostsupdater] Writing the following entries to (C:/WINDOWS/system32/drivers/etc/hosts)
==> test: [vagrant-hostsupdater]   192.168.33.53  test  # VAGRANT: 9eb404e1ac140ac4d8bb999a55ed8440 (test) / 97f8545c-ab6a-4e87-9bac-7b2739ef1a99
==> test: [vagrant-hostsupdater] This operation requires administrative access. You may skip it by manually adding equivalent entries to the hosts file.
==> test: Forcing shutdown of VM...
==> test: Destroying VM and associated drives...
C:/Users/shiro/.vagrant.d/gems/gems/vagrant-hostsupdater-1.0.2/lib/vagrant-hostsupdater/HostsUpdater.rb:98:in `initialize': Permission denied @ rb_sysopen - C:/WINDOWS/system32/drivers/etc/hosts (Errno::EACCES)
        from C:/Users/shiro/.vagrant.d/gems/gems/vagrant-hostsupdater-1.0.2/lib/vagrant-hostsupdater/HostsUpdater.rb:98:in `open'
        from C:/Users/shiro/.vagrant.d/gems/gems/vagrant-hostsupdater-1.0.2/lib/vagrant-hostsupdater/HostsUpdater.rb:98:in `addToHosts'
        from C:/Users/shiro/.vagrant.d/gems/gems/vagrant-hostsupdater-1.0.2/lib/vagrant-hostsupdater/HostsUpdater.rb:47:in `addHostEntries'
        from C:/Users/shiro/.vagrant.d/gems/gems/vagrant-hostsupdater-1.0.2/lib/vagrant-hostsupdater/Action/UpdateHosts.rb:17:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/check_guest_additions.rb:49:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/customize.rb:40:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/wait_for_communicator.rb:71:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/customize.rb:40:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/boot.rb:18:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/customize.rb:40:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/sane_defaults.rb:38:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/set_hostname.rb:16:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/forward_ports.rb:31:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/network_fix_ipv6.rb:41:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/network.rb:122:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/clear_network_interfaces.rb:26:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/prepare_nfs_settings.rb:18:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/synced_folders.rb:87:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/synced_folder_cleanup.rb:28:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/synced_folders/nfs/action_cleanup.rb:19:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/prepare_nfs_valid_ids.rb:12:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/handle_forwarded_port_collisions.rb:49:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/prepare_forwarded_port_collision_params.rb:30:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/env_set.rb:19:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/provision.rb:80:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/clear_forwarded_ports.rb:15:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/set_name.rb:50:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/clean_machine_folder.rb:17:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/check_accessible.rb:18:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builder.rb:116:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `block in run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/util/busy.rb:19:in `busy'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/call.rb:53:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builder.rb:116:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `block in run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/util/busy.rb:19:in `busy'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/call.rb:53:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builder.rb:116:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `block in run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/util/busy.rb:19:in `busy'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/call.rb:53:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/box_check_outdated.rb:78:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/config_validate.rb:25:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/check_virtualbox.rb:17:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/match_mac_address.rb:19:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/discard_state.rb:15:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/import.rb:74:in `import'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/import.rb:13:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/prepare_clone_snapshot.rb:17:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/prepare_clone.rb:15:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/customize.rb:40:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/check_accessible.rb:18:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builder.rb:116:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `block in run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/util/busy.rb:19:in `busy'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/call.rb:53:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/config_validate.rb:25:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/handle_box.rb:56:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:95:in `block in finalize_action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builder.rb:116:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `block in run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/util/busy.rb:19:in `busy'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builtin/call.rb:53:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/plugins/providers/virtualbox/action/check_virtualbox.rb:17:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/warden.rb:34:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/builder.rb:116:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `block in run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/util/busy.rb:19:in `busy'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/action/runner.rb:66:in `run'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/machine.rb:225:in `action_raw'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/machine.rb:200:in `block in action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/environment.rb:567:in `lock'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/machine.rb:186:in `call'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/machine.rb:186:in `action'
        from C:/HashiCorp/Vagrant/embedded/gems/gems/vagrant-1.8.6/lib/vagrant/batch_action.rb:82:in `block (2 levels) in run'

-------------------------------------

ログの以下の内容から

C:/WINDOWS/system32/drivers/etc/hostsを変更?しようとしたけど、
権限で無理でしたーってことらしい。

C:/Users/shiro/.vagrant.d/gems/gems/vagrant-hostsupdater-1.0.2/lib/vagrant-hostsupdater/HostsUpdater.rb:98:in `initialize': Permission denied @ rb_sysopen - C:/WINDOWS/system32/drivers/etc/hosts (Errno::EACCES)

そもそもvagrant-hostsupdaterってなんだろうと調べてみたら
hostsファイルにエントリを追加するプラグインっぽい。
(ちょろっと書いてるけど管理者権限が必要みたい)
Vagrant::Hostsupdater

わざわざ管理者権限でvagrant upするのもどうかと思ったので、
ドキュメントに従って、Vagrantfileを変更しました。

変更箇所
変更前：c1.vm.network :private_network, ip: "192.168.33.53"
変更後：c1.vm.network :private_network, ip: "192.168.33.53", hostsupdater: "skip"

変更後再度「$ vagrant up」を実行。
エラーは解消して仮想環境が立ち上がりましたー。

が、しかし、、赤文字で以下の文章が出現・・・。
-------------------------------------

$ vagrant up
Bringing machine 'test' up with 'virtualbox' provider...
==> test: Importing base box 'geerlingguy/centos7'...
==> test: Matching MAC address for NAT networking...
==> test: Checking if box 'geerlingguy/centos7' is up to date...
==> test: Setting the name of the VM: test_test_1497677181126_29912
==> test: Clearing any previously set network interfaces...
==> test: Preparing network interfaces based on configuration...
    test: Adapter 1: nat
    test: Adapter 2: hostonly
==> test: Forwarding ports...
    test: 22 (guest) => 2422 (host) (adapter 1)
    test: 22 (guest) => 2222 (host) (adapter 1)
==> test: Running 'pre-boot' VM customizations...
==> test: Booting VM...
==> test: Waiting for machine to boot. This may take a few minutes...
    test: SSH address: 127.0.0.1:2222
    test: SSH username: vagrant
    test: SSH auth method: private key
    test: Warning: Remote connection disconnect. Retrying...
    test: Warning: Remote connection disconnect. Retrying...
    test: Warning: Remote connection disconnect. Retrying...
==> test: Machine booted and ready!
==> test: Checking for guest additions in VM...
==> test: [vagrant-hostsupdater] Checking for host entries
==> test: [vagrant-hostsupdater] Skipping adding host entries (config.vm.network hostsupdater: "skip" is set)
==> test: Setting hostname...
==> test: Configuring and enabling network interfaces...
==> test: Mounting shared folders...
    test: /vagrant => D:/vagrant/test
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=1000,gid=1000 vagrant /vagrant

The error output from the command was:

mount: wrong fs type, bad option, bad superblock on vagrant,
       missing codepage or helper program, or other error

       In some cases useful info is found in syslog - try
       dmesg | tail or so.
-------------------------------------

調べると同じ事象ですでに解決策まで探してくれている記事を発見(ありがたや)。

VirtualBox 5.1.20で共有フォルダーが動かなくなる対策

早速実行してみる。

起動した仮想環境にログインして、以下のコマンドを実行。

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

仮想マシンを再起動するためローカル環境で以下のコマンドを実行。

$ vagrant reload

無事エラー解消！

上記以外にも以下の対応でも対処できるようです。

仮想環境にログイン

$ vagrant ssh

カーネルアップデート

$ sudo yum update kernel

$ exit

仮想環境再起動

$ vagrant reload

はまりどころが結構ありますが、

使いこなせればかなり便利です。

今回は以上です。