Authentication failure. Retrying - 完全解決vagrant up時警告

碰到的問題

使用vagrant啓動虛擬機時，出現以下警告：

vagrant up default: Warning: Authentication failure. Retrying...

緣由分析

受權失敗主要緣由：

• 虛擬機獲取不到物理機的公鑰（有疑問的小夥伴，建議先了解一下SSH）

解決方案

• 將公鑰複製到虛擬機vagrant用戶家目錄下的authorized_keys文件中

• Vagrantfile中指定物理機當前用戶的私鑰路徑

步驟一、確認物理機中已經生成了公鑰和私鑰

以windows系統爲例，查看當前登陸用戶的文件夾下是否包含.ssh文件夾，以及.ssh文件夾下是否包含id_rsa（私鑰）、id_rsa.pub（公鑰）兩個文件

.ssh文件夾文件以下：

注意：必須打開 【顯示隱藏的文件、文件夾或驅動器】才能看到.ssh文件夾

若是已經包含id_rsa（私鑰）、id_rsa.pub（公鑰）兩個文件則可跳過步驟一。若是沒有兩個文件則繼續往下看

生成公鑰和私鑰有多種方法，咱們使用最經常使用的辦法。開發者通常都會安裝git。直接使用git bash生成一下就行了

進入git安裝目錄

運行git-bash.vbs

執行ssh-keygen

一路回車，完成後，記住下面的地址

進入該路徑，發現有兩個文件：

這兩個文件的含是：首先，他們是1對的，二者缺1不可，id_rsa 是私鑰，id_rsa.pub是公鑰

步驟二、將公鑰複製到authorized_keys文件中

小夥伴可能奇怪，vagrant都報錯了，怎麼還能進入虛擬機？沒錯！其實此時虛擬機已經啓動完畢了，只不過此時不能接受vagrant的命令，也沒法設置共享目錄。

你只須要用客戶端工具（例如：Xshell）登陸虛擬機

通常來講默認的用戶名是vagrant，密碼也是vagrant。

進入.ssh目錄

查看是否有authorized_keys文件

[vagrant@localhost .ssh]$ pwd
/home/vagrant/.ssh
[vagrant@localhost .ssh]$ ls -al
total 8
drwx------  2 vagrant root      28 Jul 26  2016 .
drwx------. 8 vagrant vagrant 4096 Nov  6 11:02 ..
-rw-------  1 vagrant vagrant  786 Jul 26  2016 authorized_keys
[vagrant@localhost .ssh]$

若是authorized_keys文件不存在，則本身手動建立一下。
注意authorized_keys 文件的權限是600，全部者是vagrant，所屬組也是vagrant

[vagrant@localhost .ssh]$ touch authorized_keys
[vagrant@localhost .ssh]$ chmod 600 authorized_keys

複製公鑰

若是已經存在authorized_keys文件，複製物理機公鑰文件id_rsa.pub的內容，粘貼到authorized_keys文件中。每一個公鑰只佔一行
注意：公鑰內容只佔一行
例如個人authorized_keys文件中有兩個公鑰

[vagrant@localhost .ssh]$ vim authorized_keys 
  1 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDlo4N35+9OM2UCAC82E4RtiqROZU/jI6bgg76QAA56cGdLwk4CNZzbn309nNRtO7tyBtWCyFx2AOn3Hd8hIFWiokMgxlf3eSjowT9dZqmbhGrYzAkPq    r63rpHUX7M4FVjMLtoREqrGbBQZ7uZItViKeXXXl7bsGOUserLchzi+p3PJgjmw5j6ea+Kj2P7EThvcevoEPLcwGyckCTEiYo8nJ21K5bkmKCi2F8kaaJ9zbIeJ/2woayUkoZeufNo3A/gZx2bvHYAiFT    4RYLDwjrspq7pQS5Cs83YUGvolPKQfCrJRH3N+sNaeHx1NzEULMvQNxgEsFIVpi5k7OBIf4BY/ vagrant
  2 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCov9Z/3qVWXkxLS6koRWxNu9lEt+e0+/6M+XCtDx7qWiCCZovNSCbKAHO3gwCV3myIyoiP/9bv2d0Sw18d/5BMYHWT4l85IZdF87no0Euu8Yt1w4BEU    rCbL0jrDXHlVBhMyCeETr7BKDlM56meiNMo/PvNuN3qcp6tukLUXgrFRQ24hgg1mMvqQ0Km5UHYnHr+Vygc3udEVEEG5Px+04y6ap8gRZg7tKVgckdXZ7+1rNJtTXqR81uXXXbyown4eoccqsUTOK3iUs    2GdFwH/t3unbCSLu13UKDcLGG6hKG/x4aA1itIl3NdbzODgbte8UGXlifomayG+PTaf1tvb+n/ dc@GZ-Design003

步驟三、在物理機的Vagrantfile中添加如下內容

config.ssh.private_key_path = "C:/Users/dc/.ssh/id_rsa"
config.ssh.forward_agent = true

Vagrantfile所有配置內容以下：

# -*- mode: ruby -*-
# vi: set ft=ruby :

# All Vagrant configuration is done below. The "2" in Vagrant.configure
# configures the configuration version (we support older styles for
# backwards compatibility). Please don't change it unless you know what
# you're doing.
Vagrant.configure(2) do |config|
  config.vm.box = "web"
  config.ssh.private_key_path = "C:/Users/dc/.ssh/id_rsa"
  config.ssh.forward_agent = true
#  config.winnfsd.logging="on"
#  config.winnfsd.uid=1
#  config.winnfsd.gid=1
#  config.vm.synced_folder "./","/vagrant",type:"nfs"
  
  config.vm.define :web do |web|
    web.vm.provider "virtualbox" do |v|
          v.customize ["modifyvm", :id, "--name", "web", "--memory", "2048", "--cpus","2"]
    end
    web.vm.box = "web"
    web.vm.hostname = "web"
    web.vm.synced_folder "./","/vagrant"
#    web.vm.network:private_network, ip: "192.168.33.11"   
    web.vm.network "public_network"
  end
  config.vm.define :php do |php|
    php.vm.provider "virtualbox" do |v|
          v.customize ["modifyvm", :id, "--name", "php", "--memory", "512"]
    end
    php.vm.box = "php"
    php.vm.network:private_network, ip: "192.168.33.10"   
#    php.vm.network "public_network", ip: "192.168.33.10"   
    php.vm.synced_folder "./","/vagrant",type:"nfs"
    php.winnfsd.logging="on"
    php.winnfsd.uid=1
    php.winnfsd.gid=1
    php.vm.synced_folder "./","/vagrant"
  end
  config.vm.define :swoole do |swoole|
    swoole.vm.provider "virtualbox" do |v|
          v.customize ["modifyvm", :id, "--name", "swoole", "--memory", "512"]
    end
    swoole.vm.box = "swoole"
#    swoole.vm.network:private_network, ip: "192.168.33.12"   
    swoole.vm.network "public_network", ip: "192.168.33.12"  
#    swoole.vm.synced_folder "./","/vagrant",type:"nfs"
    swoole.vm.synced_folder "./","/vagrant"
  end
  config.vm.define :master do |master|
    master.vm.provider "virtualbox" do |v|
          v.customize ["modifyvm", :id, "--name", "master", "--memory", "512"]
    end
    master.vm.box = "master" 
    master.vm.network "public_network" 
    master.vm.synced_folder "./","/vagrant"
  end
  config.vm.define :slave do |slave|
    slave.vm.provider "virtualbox" do |v|
          v.customize ["modifyvm", :id, "--name", "slave", "--memory", "512"]
    end
    slave.vm.box = "slave" 
    slave.vm.network "public_network" 
    slave.vm.synced_folder "./","/vagrant"
  end
end
  # The most common configuration options are documented and commented below.
  # For a complete reference, please see the online documentation at
  # https://docs.vagrantup.com.

  # Every Vagrant development environment requires a box. You can search for
  # boxes at https://atlas.hashicorp.com/search.
  

  # Disable automatic box update checking. If you disable this, then
  # boxes will only be checked for updates when the user runs
  # `vagrant box outdated`. This is not recommended.
  # config.vm.box_check_update = false

  # Create a forwarded port mapping which allows access to a specific port
  # within the machine from a port on the host machine. In the example below,
  # accessing "localhost:8080" will access port 80 on the guest machine.
  # config.vm.network "forwarded_port", guest: 80, host: 8080

  # Create a private network, which allows host-only access to the machine
  # using a specific IP.
  # config.vm.network "private_network", ip: "192.168.33.10"

  # Create a public network, which generally matched to bridged network.
  # Bridged networks make the machine appear as another physical device on
  # your network.
  # config.vm.network "public_network"

  # Share an additional folder to the guest VM. The first argument is
  # the path on the host to the actual folder. The second argument is
  # the path on the guest to mount the folder. And the optional third
  # argument is a set of non-required options.
  # config.vm.synced_folder "../data", "/vagrant_data"

  # Provider-specific configuration so you can fine-tune various
  # backing providers for Vagrant. These expose provider-specific options.
  # Example for VirtualBox:
  #
  # config.vm.provider "virtualbox" do |vb|
  #   # Display the VirtualBox GUI when booting the machine
  #   vb.gui = true
  #
  #   # Customize the amount of memory on the VM:
  #   vb.memory = "1024"
  # end
  #
  # View the documentation for the provider you are using for more
  # information on available options.

  # Define a Vagrant Push strategy for pushing to Atlas. Other push strategies
  # such as FTP and Heroku are also available. See the documentation at
  # https://docs.vagrantup.com/v2/push/atlas.html for more information.
  # config.push.define "atlas" do |push|
  #   push.app = "YOUR_ATLAS_USERNAME/YOUR_APPLICATION_NAME"
  # end

  # Enable provisioning with a shell script. Additional provisioners such as
  # Puppet, Chef, Ansible, Salt, and Docker are also available. Please see the
  # documentation for more information about their specific syntax and use.
  # config.vm.provision "shell", inline: <<-SHELL
  #   sudo apt-get update
  #   sudo apt-get install -y apache2
  # SHELL

步驟四、重啓虛擬機

在物理機的命令行重啓虛擬機

vagrant reload XXXX