回想以前,想要安装个虚拟机是多么的麻烦。先要费尽心机找到想要的操作系统镜像文件,然后安装虚拟化软件,按照其提供的GUI界面操作一步步创建,整个过程费时费力。但是,自从使用了Vagrant以后,咱腰不酸了,腿不痛了,一口气起5个虚拟机还不费劲。
Vagrant是什么?
这是官网上Vagrant的介绍。
Create and Configure lightweight, reproducible, and portable development environments.
即用来创建和配置轻量级、可重现的、便携式的开发环境。
使用Vagrant可以将创建虚拟机的整个过程自动化起来,并具有高度的重用性。假如你是个开发者,你可以很容易为每个团队成员创建一模一样的开发环境,从根本上防止‘在我的机器上可以工作’之类的bug。假如你是个测试人员,可以一键创建多个一模一样的测试环境并行跑测试,并且跑完测试后还可以一键销毁这些测试环境,达到真正的按需创建。如果你是devops成员,需要和AWS、Chef之类的工具打交道,那么Vagrant是个很好的结合点。你可以通过Vagrant在AWS上直接创建虚拟机,并且自动运行Chef的脚本配置你的新虚拟机。
几个概念
正式介绍Vagrant功能之前先了解一下Vagrant使用的一些概念。
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Provider - 供应商,在这里指Vagrant调用的虚拟化工具。Vagrant本身并没有能力创建虚拟机,它是调用一些虚拟化工具来创建,如VirtualBox,VMWare,甚至AWS。
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Box - 可被Vagrant直接使用的虚拟机镜像文件。针对不同的Provider,Box文件的格式是不一样的。
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Vagrantfile - Vagrant根据Vagrantfile中的配置来创建虚拟机。在Vagrantfile文件中你需要指明使用哪个Box,需要预安装哪些软件,虚拟机的网络配置等。
Vagrant的安装
安装Vagrant非常简单,可以在Downloads页面选择最新的版本安装。Vagrant支持Windows、Linux、Mac等平台。
Box管理
使用Vagrant之前先要给Vagrant添加Box,也就是可供Vagrant使用的虚拟机镜像文件。Vagrant官网本身维护了一些镜像文件,我们可以直接使用。http://www.vagrantbox.es/上面有更多的box可以供我们使用。
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#添加名为precise32的box文件
$ vagrant init precise32 http://files.vagrantup.com/precise32.box
$ vagrant box list
precise32 (virtualbox)
$ vagrant box remove precise64 virtualbox
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可以看到Box与Provider是相关的,每个Box都必须指定Provier,只有使用对应的Provier才能正确使用Box。
创建并运行虚拟机
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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
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vagrant init precise32
会在当前目录下生成一个Vagrantfie文件,其使用precise32作为box。vagrant up
则是使用virtual box这个provider来初始化并启动precise32这个虚拟机。
我们可以详细的看看Vagrantfile这个文件。
Vagrantfile
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# -*- mode: ruby -*-
# vi: set ft=ruby :
# Vagrantfile API及语法版本
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.
"
# # }
#
# 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
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从上述的文件可以看出Vagrantfile可以配置很多东西,比如使用的Box,需要转发的端口,同步指定的目录,使用Chef、puppet等对虚拟机进行预配置等。
如果修改了Vagrantfile中的配置,只需要执行vagrant reload
来应用新配置。
同步目录
虚拟机启动起来以后就可以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:~$
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Vagrant会自动给虚拟机根目录下创建一个名为vagrant的目录。这个目录可以与主机Vagrantfile所在的目录保持同步。这个同步是相互的,无论改动了主机目录中的文件,还是虚拟机目录中的文件,都可以自动同步到另一方。
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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
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多机器管理
其实Vagrantfile支持配置多台机器,如果你需要设置多台服务器及数据库环境,可以用一个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
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这个文件配置了两个box,一个叫web,一个叫db。现在启动虚拟机就需要加上虚拟机名了。
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#启动web虚拟机
$ vagrant up web
#启用db虚拟机
$ vagrant up db
#默认启动所有的虚拟机
$ vagrant up
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关闭虚拟机
Vagrant提供了好几种方法来关闭虚拟机,你可以根据不同的情况选择不同的方式。
vagrant suspend
将虚拟机置于休眠状态。这时候主机会保存虚拟机的当前状态。再用vagrant up
启动虚拟机时能够返回之前工作的状态。这种方式优点是休眠和启动速度都很快,只有几秒钟。缺点是需要额外的磁盘空间来存储当前状态。
vagrant halt
则是关机。如果想再次启动还是使用vagrant up
命令,不过需要多花些时间。
vagrant destroy
则会将虚拟机从磁盘中删除。如果想重新创建还是使用vagrant up
命令。
另外1.2以上版本的Vagrant还引用了插件机制。可以通过vagrant plugin
来添加各种各样的plugin,这给Vagrant的应用带来了更大的灵活性和针对性。比如可以添加vagrant-windows
的插件来增加对windows系统的支持,通过添加vagrant-aws
插件来实现给AWS创建虚拟机的功能。你也可以编写自己的插件。由于Vagrant是ruby写的一个gem,其插件的编写也是使用的Ruby语言。这里就不多做介绍了。感兴趣的可以去官网查看。