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回想以前,想要安裝個虛擬機是多么的麻煩。先要費盡心機找到想要的操作系統鏡像文件,然后安裝虛擬化軟件,按照其提供的GUI界面操作一步步創建,整個過程費時費力。但是,自從使用了Vagrant以后,咱腰不酸了,腿不痛了,一口氣起5個虛擬機還不費勁。

Vagrant是什么?

這是官網上Vagrant的介紹。

Create and Configure lightweight, reproducible, and portable development environments.

即用來創建和配置輕量級、可重現的、便攜式的開發環境。

使用Vagrant可以將創建虛擬機的整個過程自動化起來,并具有高度的重用性。假如你是個開發者,你可以很容易為每個團隊成員創建一模一樣的開發環境,從根本上防止‘在我的機器上可以工作’之類的bug。假如你是個測試人員,可以一鍵創建多個一模一樣的測試環境并行跑測試,并且跑完測試后還可以一鍵銷毀這些測試環境,達到真正的按需創建。如果你是devops成員,需要和AWS、Chef之類的工具打交道,那么Vagrant是個很好的結合點。你可以通過Vagrant在AWS上直接創建虛擬機,并且自動運行Chef的腳本配置你的新虛擬機。

幾個概念

正式介紹Vagrant功能之前先了解一下Vagrant使用的一些概念。

  • Provider - 供應商,在這里指Vagrant調用的虛擬化工具。Vagrant本身并沒有能力創建虛擬機,它是調用一些虛擬化工具來創建,如VirtualBox,VMWare,甚至AWS。

  • Box - 可被Vagrant直接使用的虛擬機鏡像文件。針對不同的Provider,Box文件的格式是不一樣的。

  • Vagrantfile - Vagrant根據Vagrantfile中的配置來創建虛擬機。在Vagrantfile文件中你需要指明使用哪個Box,需要預安裝哪些軟件,虛擬機的網絡配置等。

Vagrant的安裝

安裝Vagrant非常簡單,可以在Downloads頁面選擇最新的版本安裝。Vagrant支持Windows、Linux、Mac等平臺。

Box管理

使用Vagrant之前先要給Vagrant添加Box,也就是可供Vagrant使用的虛擬機鏡像文件。Vagrant官網本身維護了一些鏡像文件,我們可以直接使用。http://www.vagrantbox.es/上面有更多的box可以供我們使用。

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#添加名為precise32的box文件
 $ vagrant init precise32 http://files.vagrantup.com/precise32.box
$ vagrant box list
precise32 (virtualbox)

$ vagrant box remove precise64 virtualbox

可以看到Box與Provider是相關的,每個Box都必須指定Provier,只有使用對應的Provier才能正確使用Box。

創建并運行虛擬機

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$ vagrant box list
precise32 (virtualbox)
$ vagrant init precise32
A `Vagrantfile` has been placed in this directory. You are now
ready to `vagrant up` your first virtual environment! Please read
the comments in the Vagrantfile as well as documentation on
`vagrantup.com` for more information on using Vagrant.
$ vagrant up
Bringing machine 'default' up with 'virtualbox' provider...
[default] Importing base box 'precise32'...
[default] Matching MAC address for NAT networking...
[default] Setting the name of the VM...
[default] Clearing any previously set forwarded ports...
[default] Creating shared folders metadata...
[default] Clearing any previously set network interfaces...
[default] Preparing network interfaces based on configuration...
[default] Forwarding ports...
[default] -- 22 => 2222 (adapter 1)
[default] Booting VM...
[default] Waiting for machine to boot. This may take a few minutes...
[default] Machine booted and ready!
[default] Mounting shared folders...
[default] -- /vagrant

vagrant init precise32會在當前目錄下生成一個Vagrantfie文件,其使用precise32作為box。vagrant up則是使用virtual box這個provider來初始化并啟動precise32這個虛擬機。

我們可以詳細的看看Vagrantfile這個文件。

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

# Vagrantfile API及語法版本
VAGRANTFILE_API_VERSION = "2"

Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|

  # 使用的box
  config.vm.box = "precise32"

  # 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

  # If true, then any SSH connections made will enable agent forwarding.
  # Default value: false
  # config.ssh.forward_agent = true

  # 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|
  #   # Don't boot with headless mode
  #   vb.gui = true
  #
  #   # Use VBoxManage to customize the VM. For example to change memory:
  #   vb.customize ["modifyvm", :id, "--memory", "1024"]
  # end
  #
  # View the documentation for the provider you're using for more
  # information on available options.

  # Enable provisioning with Puppet stand alone.  Puppet manifests
  # are contained in a directory path relative to this Vagrantfile.
  # You will need to create the manifests directory and a manifest in
  # the file precise32.pp in the manifests_path directory.
  #
  # An example Puppet manifest to provision the message of the day:
  #
  # # group { "puppet":
  # #   ensure => "present",
  # # }
  # #
  # # File { owner => 0, group => 0, mode => 0644 }
  # #
  # # file { '/etc/motd':
  # #   content => "Welcome to your Vagrant-built virtual machine!
  # #               Managed by Puppet.\n"
  # # }
  #
  # config.vm.provision :puppet do |puppet|
  #   puppet.manifests_path = "manifests"
  #   puppet.manifest_file  = "site.pp"
  # end

  # Enable provisioning with chef solo, specifying a cookbooks path, roles
  # path, and data_bags path (all relative to this Vagrantfile), and adding
  # some recipes and/or roles.
  #
  # config.vm.provision :chef_solo do |chef|
  #   chef.cookbooks_path = "../my-recipes/cookbooks"
  #   chef.roles_path = "../my-recipes/roles"
  #   chef.data_bags_path = "../my-recipes/data_bags"
  #   chef.add_recipe "mysql"
  #   chef.add_role "web"
  #
  #   # You may also specify custom JSON attributes:
  #   chef.json = { :mysql_password => "foo" }
  # end

  # Enable provisioning with chef server, specifying the chef server URL,
  # and the path to the validation key (relative to this Vagrantfile).
  #
  # The Opscode Platform uses HTTPS. Substitute your organization for
  # ORGNAME in the URL and validation key.
  #
  # If you have your own Chef Server, use the appropriate URL, which may be
  # HTTP instead of HTTPS depending on your configuration. Also change the
  # validation key to validation.pem.
  #
  # config.vm.provision :chef_client do |chef|
  #   chef.chef_server_url = "https://api.opscode.com/organizations/ORGNAME"
  #   chef.validation_key_path = "ORGNAME-validator.pem"
  # end
  #
  # If you're using the Opscode platform, your validator client is
  # ORGNAME-validator, replacing ORGNAME with your organization name.
  #
  # If you have your own Chef Server, the default validation client name is
  # chef-validator, unless you changed the configuration.
  #
  #   chef.validation_client_name = "ORGNAME-validator"
end

從上述的文件可以看出Vagrantfile可以配置很多東西,比如使用的Box,需要轉發的端口,同步指定的目錄,使用Chef、puppet等對虛擬機進行預配置等。

如果修改了Vagrantfile中的配置,只需要執行vagrant reload來應用新配置。

同步目錄

虛擬機啟動起來以后就可以ssh上去了。

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$ vagrant ssh
Welcome to Ubuntu 12.04 LTS (GNU/Linux 3.2.0-23-generic-pae i686)

 * Documentation:  https://help.ubuntu.com/
Welcome to your Vagrant-built virtual machine.
Last login: Wed Oct  2 09:41:08 2013 from 10.0.2.2
vagrant@precise32:~$ who
vagrant  pts/0        2013-10-02 09:47 (10.0.2.2)
vagrant@precise32:~$ hostname
precise32
vagrant@precise32:~$

Vagrant會自動給虛擬機根目錄下創建一個名為vagrant的目錄。這個目錄可以與主機Vagrantfile所在的目錄保持同步。這個同步是相互的,無論改動了主機目錄中的文件,還是虛擬機目錄中的文件,都可以自動同步到另一方。

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vagrant@precise32:~$ cd /vagrant/
vagrant@precise32:/vagrant$ ls
Vagrantfile
vagrant@precise32:/vagrant$ touch test.txt
vagrant@precise32:/vagrant$ exit
logout
Connection to 127.0.0.1 closed.
$ ls
Vagrantfile test.txt

多機器管理

其實Vagrantfile支持配置多臺機器,如果你需要設置多臺服務器及數據庫環境,可以用一個Vagrantfile搞定。

Vagrantfile
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Vagrant.configure("2") do |config|  config.vm.provision "shell", inline: "echo Hello"  config.vm.define "web" do |web|    web.vm.box = "apache"  end  config.vm.define "db" do |db|    db.vm.box = "mysql"  end
end

這個文件配置了兩個box,一個叫web,一個叫db。現在啟動虛擬機就需要加上虛擬機名了。

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#啟動web虛擬機
$ vagrant up web

#啟用db虛擬機
$ vagrant up db

#默認啟動所有的虛擬機
$ vagrant up

關閉虛擬機

Vagrant提供了好幾種方法來關閉虛擬機,你可以根據不同的情況選擇不同的方式。

vagrant suspend將虛擬機置于休眠狀態。這時候主機會保存虛擬機的當前狀態。再用vagrant up啟動虛擬機時能夠返回之前工作的狀態。這種方式優點是休眠和啟動速度都很快,只有幾秒鐘。缺點是需要額外的磁盤空間來存儲當前狀態。

vagrant halt則是關機。如果想再次啟動還是使用vagrant up命令,不過需要多花些時間。

vagrant destroy則會將虛擬機從磁盤中刪除。如果想重新創建還是使用vagrant up命令。

另外1.2以上版本的Vagrant還引用了插件機制。可以通過vagrant plugin來添加各種各樣的plugin,這給Vagrant的應用帶來了更大的靈活性和針對性。比如可以添加vagrant-windows的插件來增加對windows系統的支持,通過添加vagrant-aws插件來實現給AWS創建虛擬機的功能。你也可以編寫自己的插件。由于Vagrant是ruby寫的一個gem,其插件的編寫也是使用的Ruby語言。這里就不多做介紹了。感興趣的可以去官網查看。


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