优化 vagrantFile config

# 优化 vagrantFile

## vagrang file setting

编辑 Vagrantfile 文件

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

Vagrant.configure("2") do |config|

config.vm.box = "centos-6-mini"

#config.vm.network "forwarded_port", guest: 80, host: 8080
  config.vm.network "private_network", ip: "192.168.30.10"
  config.vm.network "public_network"

config.vm.synced_folder "./data", "/vagrant_data", type: "nfs"
  config.vm.provider "virtualbox" do |vb|
    vb.gui = false
    vb.memory = "1024"
    vb.name = "ansible"
    vb.cpus = "2"
  end
end

```

## 打开VM后验证网络

```bash

eth0      Link encap:Ethernet  HWaddr 08:00:27:C9:A5:AF  
          inet addr:10.0.2.15  Bcast:10.0.2.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fec9:a5af/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1197 errors:0 dropped:0 overruns:0 frame:0
          TX packets:884 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:138573 (135.3 KiB)  TX bytes:160153 (156.3 KiB)

eth1      Link encap:Ethernet  HWaddr 08:00:27:63:45:40  
          inet addr:192.168.30.10  Bcast:192.168.30.255  Mask:255.255.255.0
          inet6 addr: fe80::a00:27ff:fe63:4540/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:100 errors:0 dropped:0 overruns:0 frame:0
          TX packets:81 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:10263 (10.0 KiB)  TX bytes:9117 (8.9 KiB)

eth2      Link encap:Ethernet  HWaddr 08:00:27:A5:D1:F9  
          inet addr:1.81.35.8  Bcast:10.81.35.255  Mask:255.255.254.0
          inet6 addr: fe80::a00:27ff:fea5:d1f9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:16422 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6256 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:22002636 (20.9 MiB)  TX bytes:465492 (454.5 KiB)

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:c9:a5:af brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global eth0
    inet6 fe80::a00:27ff:fec9:a5af/64 scope link 
       valid_lft forever preferred_lft forever
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:63:45:40 brd ff:ff:ff:ff:ff:ff
    inet 192.168.30.10/24 brd 192.168.30.255 scope global eth1
    inet6 fe80::a00:27ff:fe63:4540/64 scope link 
       valid_lft forever preferred_lft forever
4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 08:00:27:a5:d1:f9 brd ff:ff:ff:ff:ff:ff
    inet 1.81.35.28/23 brd 1.81.35.255 scope global eth2
    inet6 fe80::a00:27ff:fea5:d1f9/64 scope link 
       valid_lft forever preferred_lft forever

```