O0十、動手實踐虛擬網絡

參考 http://www.javashuo.com/article/p-vuyxltao-m.html

 

本節將演示如何在實驗環境中實現下圖所示的虛擬網絡

 

 

配置Linux Bridge br0

 

編輯 /etc/network/interfaces ,配置br0 

 

root@ubuntu:~# cat /etc/network/interfaces    #    修改前，網絡信息配置在ens160下

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).

 

source /etc/network/interfaces.d/*

 

# The loopback network interface

auto lo

iface lo inet loopback

 

# The primary network interface

auto ens160

iface ens160 inet static

     address 10.12.31.211

    netmask 255.255.252.0

    network 10.12.28.0

    broadcast 10.12.31.255

    gateway 10.12.28.6

    # dns-* options are implemented by the resolvconf package, if installed

    dns-nameservers 10.12.28.6

    up route add -net 172.22.0.0 netmask 255.255.0.0 gw 10.12.28.1 ens160

 

root@ubuntu:~# cat /etc/network/interfaces    #    修改後，ens160掛載br0下，網絡信息配置在br0上

# This file describes the network interfaces available on your system

# and how to activate them. For more information, see interfaces(5).

 

source /etc/network/interfaces.d/*

 

# The loopback network interface

auto lo

iface lo inet loopback

 

# The primary network interface

auto ens160

iface ens160 inet static

 

auto br0

iface br0 inet static

    bridge_stp off

    bridge_waitport 0

    bridge_fd 0

     bridge_ports ens160

     address 10.12.31.211

    netmask 255.255.252.0

    network 10.12.28.0

    broadcast 10.12.31.255

    gateway 10.12.28.6

    # dns-* options are implemented by the resolvconf package, if installed

    dns-nameservers 10.12.28.6

    up route add -net 172.22.0.0 netmask 255.255.0.0 gw 10.12.28.1 br0

 

root@ubuntu:~# reboot    #    重啓系統生效

 

root@ubuntu:~# ifconfig    #    查看網絡信息都配置到了br0上

br0       Link encap:Ethernet  HWaddr 00:50:56:87:4c:70  

           inet addr:10.12.31.211  Bcast:10.12.31.255  Mask:255.255.252.0

          inet6 addr: fe80::250:56ff:fe87:4c70/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:307 errors:0 dropped:0 overruns:0 frame:0

          TX packets:129 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:19800 (19.8 KB)  TX bytes:18385 (18.3 KB)

 

ens160    Link encap:Ethernet  HWaddr 00:50:56:87:4c:70  

          inet6 addr: fe80::250:56ff:fe87:4c70/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:314 errors:0 dropped:0 overruns:0 frame:0

          TX packets:160 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:24520 (24.5 KB)  TX bytes:22247 (22.2 KB)

 

lo        Link encap:Local Loopback  

          inet addr:127.0.0.1  Mask:255.0.0.0

          inet6 addr: ::1/128 Scope:Host

          UP LOOPBACK RUNNING  MTU:65536  Metric:1

          RX packets:85 errors:0 dropped:0 overruns:0 frame:0

          TX packets:85 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1

          RX bytes:6165 (6.1 KB)  TX bytes:6165 (6.1 KB)

 

virbr0    Link encap:Ethernet  HWaddr 00:00:00:00:00:00  

          inet addr:192.168.122.1  Bcast:192.168.122.255  Mask:255.255.255.0

          UP BROADCAST MULTICAST  MTU:1500  Metric:1

          RX packets:0 errors:0 dropped:0 overruns:0 frame:0

          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

 

root@ubuntu:~# brctl show    #    查看 ens160 掛到了br0 下

bridge name    bridge id        STP enabled    interfaces

br0        8000.005056874c70    no        ens160

virbr0        8000.000000000000    yes        

 

 

除了br0 ，咱們還能看到一個 virbr0 的Bridge ，並且 virbr0 上已經配置了IP 地址 192.168.122.1 。virbr0 的做用咱們後面會介紹。

 

 建立虛機VM1 和 VM2

 

root@ubuntu:~# virsh list    #    查看虛擬列表

Id    Name                           State

----------------------------------------------------

6     VM1                            running

7     VM2                            running

 

 

設置KVM虛機 vnc 端口、密碼、監聽地址的方法

 

    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0' passwd='qB6wbeu39BXnH8JxGTltbeQoLvGjvwax'>

      <listen type='address' address='0.0.0.0'/>

    </graphics>

 

配置VM1 和 VM2

 

將VM1的虛擬網卡鏈接到br0上，VM2也作一樣操做

 

 

root@ubuntu:~# virsh domiflist VM1    #    查看VM1網卡信息

Interface  Type       Source     Model       MAC

-------------------------------------------------------

vnet0      bridge     br0        rtl8139     52:54:00:58:af:ef

 

 

 

在VM1 中給eth0 配置 IP 地址 10.12.31.241/22 ，測試網絡連通性

在VM2 中給eth0 配置 IP 地址 10.12.31.242/22 ，測試網絡連通性

 

 

 

以上實驗證實了 VM一、VM二、宿主機以及宿主機之外的網絡是能夠互相通訊的。

 

ps：由於這裏是在esxi 上部署的kvm，因此該kvm鏈接的esxi網絡須要接受混雜模式