使用libvirt / openvswitch在两台主机和两台VM之间建立专用网络

时间:2015-07-22 14:50:43

标签: linux networking debian libvirt openvswitch

我有两个节点和两个VM

kvm01
-nic1 123.123.123.1

VM1 
-vnet1 123.123.123.2 (public) -vnet2 10.0.0.1 (private)

kvm02
-nic1 123.123.123.2

VM2
-vnet1 123.123.123.4 (public) -vnet2 10.0.0.2 (private)

如何设置openvswitch网络以便VM1和VM2位于专用网络上,但主机位于两个不同的位置?

编辑:

运行此命令:

# ovs-vsctl add-port br-private vxlan1 -- \
  set Interface vxlan1 type=vxlan options:remote_ip=123.123.123.2

导致此OVS配置:

root@backup01:~# ovs-vsctl show
6276bd0a-920b-469d-a4e0-90d990dd8f94
    Bridge "br-private1"
        Port "vxlan1"
            Interface "vxlan1"
                type: vxlan
                options: {remote_host="107.150.29.72"}
        Port "br-private1"
            Interface "br-private1"
                type: internal
    ovs_version: "2.3.0"
root@kvmssd01:~# ovs-vsctl show
da6399d4-1435-437d-90d7-3e75c443389b
    Bridge br-private
        Port "vxlan1"
            Interface "vxlan1"
                type: vxlan
                options: {remote_host="107.150.29.68"}
        Port br-private
            Interface br-private
                type: internal
    ovs_version: "2.3.0"

使用此内核:

root@backup01:~# uname -r
3.16.0-4-amd64

使用此模块:

root@backup01:~# modinfo openvswitch
filename:       /lib/modules/3.16.0-4-amd64/kernel/net/openvswitch/openvswitch.ko
license:        GPL
description:    Open vSwitch switching datapath
depends:        libcrc32c,vxlan,gre
intree:         Y
vermagic:       3.16.0-4-amd64 SMP mod_unload modversions 

这个版本的OVS:

root@backup01:~# ovs-vsctl --version
ovs-vsctl (Open vSwitch) 2.3.0
Compiled Dec 19 2014 03:59:10
DB Schema 7.6.0

导致这些错误:

root@backup01:~# ovs-vswitchd logs
2015-07-23T16:34:59Z|00001|reconnect|INFO|logs: connecting...
2015-07-23T16:34:59Z|00002|reconnect|INFO|logs: connection attempt failed
  (Address family not supported by protocol)
2015-07-23T16:34:59Z|00003|reconnect|INFO|logs: waiting 1 seconds before reconnect
2015-07-23T16:35:00Z|00004|reconnect|INFO|logs: connecting...
2015-07-23T16:35:00Z|00005|reconnect|INFO|logs: connection attempt failed 
    (Address family not supported by protocol)
2015-07-23T16:35:00Z|00006|reconnect|INFO|logs: waiting 2 seconds before reconnect

lsmod输出:

# lsmod | grep openvswitch 
openvswitch 63932 0 
gre 12777 1 openvswitch 
vxlan 35053 1 openvswitch 
libcrc32c 12426 1 openvswitch

1 个答案:

答案 0 :(得分:2)

一种选择是在两台主机上的OVS网桥之间建立VXLAN隧道。

创建OVS网桥

在每台主机上,创建一个将由专用网络使用的OVS网桥:

ovs-vsctl add-br br-private

创建libvirt虚拟机时,请将每个访客的vnet2附加到br-private网桥。使用virt-install这看起来像:

virt-install ... -w bridge=br-private,virtualport_type=openvswitch

如果您使用其他机制来创建guest虚拟机,则相应的XML如下所示:

<interface type='bridge'>
    < source bridge='br-private'/>
    < virtualport type='openvswitch'/>
< /interface>

创建VXLAN隧道

现在创建一个从kvm01kvm02的VXLAN隧道。在kvm01

ovs-vsctl add-port br-private vxlan1 -- \
  set Interface vxlan1 type=vxlan options:remote_ip=123.123.123.2

kvm02

ovs-vsctl add-port br-private vxlan1 -- \
  set Interface vxlan1 type=vxlan options:remote_ip=123.123.123.1

使用此隧道并将您的访客连接到br-private, 您已经创建了一个跨多个主机的虚拟网络。

请注意,VXLAN在UDP端口4789上运行,因此您可能需要修改防火墙配置以允许这些连接。

完成的OVS配置如下所示:

# ovs-vsctl show
ac885d3d-b636-4bb1-a75e-37f361af87e3
    Bridge br-private
        Port "vxlan1"
            Interface "vxlan1"
                type: vxlan
                options: {remote_ip="192.168.122.107"}
        Port br-private
            Interface br-private
                type: internal
        Port vnet2
            Interface vnet2
    ovs_version: "2.3.2"

...虽然当然使用你的主机IP地址,而不是我测试环境中的这个地址。