feat(Vagrantfile): Add Vagrantfile for easy start

.gitignore

@@ -3,3 +3,4 @@
 /machine*
 /bin
 /src
+.vagrant

Documentation/development-tools.md

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+# Development tools
+
+## Vagrant
+
+For fast start you can use Vagrant. `vagrant up` will make etcd build and running on virtual machine. Required Vagrant version is 1.5.0.
+
+Next lets set a single key and then retrieve it:
+
+```
+curl -L http://127.0.0.1:4001/v2/keys/mykey -XPUT -d value="this is awesome"
+curl -L http://127.0.0.1:4001/v2/keys/mykey
+```

README.md

@@ -45,6 +45,10 @@ _NOTE_: you need go 1.2+. Please check your installation with
 go version
 ```
 
+See the [development tools documentation][development-tools.md] for alternative build methods like using Vagrant.
+
+[development-tools.md]: https://github.com/coreos/etcd/blob/master/Documentation/development-tools.md
+
 ### Running
 
 First start a single machine cluster of etcd:

Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+#
+Vagrant.require_version '>= 1.5.0'
+Vagrant.configure("2") do |config|
+  config.vm.box = "precise64"
+  config.vm.box_url = "http://files.vagrantup.com/precise64.box"
+
+  config.vm.network :forwarded_port, host: 4001, guest: 4001
+  config.vm.network :forwarded_port, host: 7001, guest: 7001
+
+  # Fix docker not being able to resolve private registry in VirtualBox
+  config.vm.provider :virtualbox do |vb, override|
+    vb.customize ["modifyvm", :id, "--natdnshostresolver1", "on"]
+    vb.customize ["modifyvm", :id, "--natdnsproxy1", "on"]
+  end
+
+  config.vm.provision "docker" do |d|
+    d.build_image "/vagrant", args: '-t etcd'
+    d.run "etcd", args: "-p 4001:4001 -p 7001:7001", demonize: true
+  end
+
+  # plugin conflict
+  if Vagrant.has_plugin?("vagrant-vbguest")
+    config.vbguest.auto_update = false
+  end
+end