neutron之SDN简单测试

title: Neutron SDN 手动实现手册 date: 2017-04-13 23:37 tags: Network

本文旨在通过自己搭建类似neutron （openvswitch + gre）实现SDN 的环境，学习了解其工作原理，模拟核心原理，比如：同一租户自定义网络 instance 互通，手动为instance 分配 floating ip 等相关内容。

![image](E:\公司资料\github page\hexo\source_posts\文档图片\手工SDN1.png)

###主机网卡配置

controller:

	     eth0:10.20.0.201   (management network)

	     eht1:172.16.0.201   (public/external network)

	     eht2:192.168.4.201  (private network，gre tunning)

compute01:

	     eth0:10.20.0.202   (management network)

	     eht1:(disabled)

	     eht2:192.168.4.202  (private network，gre tunning)

##模拟安装网络节点(Network1)

模拟Network 节点相关实现，比如L3、dhcp-agent实现，为了模拟多节点网络情况，这里Network同时也模拟一个计算节点，模拟M2 openvswitch 实现，上面运行instance1。

网络接口配置

vi /etc/sysconfig/network-scripts/ifcfg-eth0

	DEVICE=eth0

	TYPE=Ethernet

	ONBOOT=yes

	NM_CONTROLLED=yes

	BOOTPROTO=static

	IPADDR=10.20.0.201

	NETMASK=255.255.255.0

vi /etc/sysconfig/network-scripts/ifcfg-eth1

	DEVICE=eth1

	TYPE=Ethernet

	ONBOOT=yes

	NM_CONTROLLED=yes

	BOOTPROTO=static

	IPADDR=172.16.0.201

	NETMASK=255.255.255.0

vi /etc/sysconfig/network-scripts/ifcfg-eth2

	DEVICE=eth2

	TYPE=Ethernet

	ONBOOT=yes

	NM_CONTROLLED=yes

	BOOTPROTO=static

	IPADDR=192.168.4.201

	NETMASK=255.255.255.0

重启网络服务

service network restart

安装需要用到的包

yum install libvirt openvswitch python-virtinst xauth tigervnc qemu-* -y

移除默认的libvirt 网络，方便清晰分析网络情况

virsh net-destroy default

virsh net-autostart --disable default

virsh net-undefine default

设置允许ipforwarding

vi /etc/sysctl.conf

	net.ipv4.ip_forward=1

	net.ipv4.conf.all.rp_filter=0

	net.ipv4.conf.default.rp_filter=0

立即生效

sysctl -p

启动openvswitch

service openvswitch start

chkconfig openvswitch on

创建一个linux bridge

brctl addbr qbr01

ip link set qbr01 up

创建一个instance，并连接到qbr01 Bridge，网络接口部分配置如下

<interface type='bridge'>

	      <source bridge='qbr01'/>

	      <target dev='tap01'/>

	      <model type='virtio'/>

	      <driver name='qemu'/>

	      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

	</interface>

可以参考附件./gre/instance1.xml创建

cp ~/gre/ /var/tmp/

	cd /var/tmp/gre

	mv cirros-0.3.0-x86_64-disk.img instance1.img

	virsh define instance1.xml

	virsh start instance1

	virsh vncdisplay instance1

	vncviewer :0

启动console 以后,登录添加ip 地址 192.168.1.11

ip addr add 192.168.1.11/24 dev eth0

route add default gw 192.168.1.1

创建一个内部bridge br-int，模拟 OpenStack integrated bridge

ovs-vsctl add-br br-int

ovs-vsctl add-port br-int gre0 -- set interface gre0 type=gre options:remote_ip=192.168.4.202

创建一个veth peer，连接Linux Bridge 'qbr01' 和 OpenvSwich Bridge 'br-ini'

ip link add qvo01 type veth peer name qvb01

brctl addif qbr01 qvb01

ovs-vsctl add-port br-int qvo01

ovs-vsctl set port qvo01 tag=100

ip link set qvb01 up

ip link set qvo01 up

查看现在network1上的 br-int

ovs-vsctl show

##模拟安装计算节点(compute1)

##网络接口配置

vi /etc/sysconfig/network-scripts/ifcfg-eth0

	DEVICE=eth0

	TYPE=Ethernet

	ONBOOT=yes

	NM_CONTROLLED=yes

	BOOTPROTO=static

	IPADDR=10.20.0.202

	NETMASK=255.255.255.0

vi /etc/sysconfig/network-scripts/ifcfg-eth1

	DEVICE=eth1

	TYPE=Ethernet

	ONBOOT=yes

	NM_CONTROLLED=yes

	BOOTPROTO=static

	IPADDR=172.16.0.202

	NETMASK=255.255.255.0

vi /etc/sysconfig/network-scripts/ifcfg-eth2

	DEVICE=eth2

	TYPE=Ethernet

	ONBOOT=yes

	NM_CONTROLLED=yes

	BOOTPROTO=static

	IPADDR=192.168.4.202

	NETMASK=255.255.255.0

重启网络服务

service network restart

安装需要用到的包

yum install libvirt openvswitch python-virtinst xauth tigervnc  qemu-*

移除libvirt 默认的网络

virsh net-destroy default

virsh net-autostart --disableu default

virsh net-undefine default

设置允许ipforwarding

vi /etc/sysctl.conf

    net.ipv4.ip_forward=1

    net.ipv4.conf.all.rp_filter=0

    net.ipv4.conf.default.rp_filter=0

立即生效

sysctl -p

启动openvswitch

service openvswitch start

chkconfig openvswitch on

创建一个linux bridge

brctl addbr qbr02

ip link set qbr02 up

创建一个vm，并连接到qbr02

<interface type='bridge'>

      <source bridge='qbr02'/>

      <target dev='tap02'/>

      <model type='virtio'/>

      <driver name='qemu'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

</interface>

上gre目录到compute1 节点，可以参考附件./gre/instance2.xml创建

cp ~/gre/ /var/tmp/

cd /var/tmp/gre

mv cirros-0.3.0-x86_64-disk.img instance2.img

virsh define instance2.xml

virsh start instance2

virsh vncdisplay instance2

vncviewer :0

启动console 以后,登录添加ip得知 192.168.1.12

ip addr add 192.168.1.12/24 dev eth0

route add default gw 192.168.1.1

创建一个内部bridge br-int，模拟 OpenStack integrated bridge

ovs-vsctl add-br br-int

ovs-vsctl add-port br-int gre0 -- set interface gre0 type=gre options:remote_ip=192.168.4.201

创建一个veth peer，连接Linux Bridge 'qbr02' 和 OpenvSwich Bridge 'br-ini'

ip link add qvo02 type veth peer name qvb02

brctl addif qbr02 qvb02

ovs-vsctl add-port br-int qvo02

ovs-vsctl set port qvo02 tag=100

ip link set qvb02 up

ip link set qvo02 up

查看现在network1 上的 br-int

ovs-vsctl show

检查是否能连通instance1，在instance2的控制台

ping 192.168.1.11

##通过 Network Namespace 实现租户私有网络互访

添加一个namespace，dhcp01用于隔离租户网络。

ip netns add dhcp01

为私有网络192.168.1.0/24 ，在命名空间dhcp01 中创建dhcp 服务

ovs-vsctl add-port br-int tapdhcp01 -- set interface tapdhcp01 type=internal

ovs-vsctl set port tapdhcp01 tag=100

ip link set tapdhcp01 netns dhcp01

ip netns exec dhcp01 ip addr add 192.168.1.2/24 dev tapdhcp01

ip netns exec dhcp01 ip link set tapdhcp01 up

检查网络是否连通，在namespace 访问instance1 和 instance2

ip netns exec dhcp01 ping 192.168.1.12

ip netns exec dhcp01 ping 192.168.1.11

##通过 Network Namespace 和Iptables 实现L3 router

ovs-vsctl add-br br-ex

重新配置eth1 和 br-ex

vi /etc/sysconfig/network-scripts/ifcfg-eth1

	DEVICE=eth1

	ONBOOT=yes

	BOOTPROTO=none

	PROMISC=yes

	MTU=1546

	###################################

	DEVICE=ens160

    TYPE=OVSPort

    DEVICETYPE=ovs

    OVS_BRIDGE=br-ex

    ONBOOT=yes

	####################################

vi /etc/sysconfig/network-scripts/ifcfg-br-ex

	DEVICE=br-ex

	TYPE=Bridge

	ONBOOT=yes

	BOOTPROTO=none

	IPADDR0=172.16.0.201

	PREFIX0=24

	#######################################

	DEVICE=br-ex

    ONBOOT=yes

    DEVICETYPE=ovs

    TYPE=OVSBridge

    BOOTPROTO=static

    IPADDR=192.168.2.134

    NETMASK=255.255.255.0

    GATEWAY=192.168.2.1

    DNS1=218.2.2.2

	######################################

重启启动网络服务

ovs-vsctl add-port br-ex eth1 && service network restart

检查网络，配置后是否连通

ping 172.16.0.201

添加一个namespace，router01 用于路由和floating ip 分配

ip netns add router01

在br-int添加一个接口，作为私有网络192.168.1.0/24的网关

ovs-vsctl add-port br-int qr01 -- set interface qr01 type=internal

ovs-vsctl set port qr01 tag=100

ip link set qr01 netns router01

ip netns exec router01 ip addr add 192.168.1.1/24 dev qr01

ip netns exec router01 ip link set qr01 up

ip netns exec router01 ip link set lo up

在br-ex中添加一个接口，用于私网192.168.1.0/24设置下一跳地址

ovs-vsctl add-port br-ex qg01 -- set interface qg01  type=internal

ip link set qg01  netns router01

ip netns exec router01 ip addr add 172.16.0.100/24 dev qg01

ip netns exec router01 ip link set qg01 up

ip netns exec router01 ip link set lo up

模拟分配floating ip 访问instance1

为instance1 192.168.1.11 分配floating ip，172.16.0.101

ip netns exec router01 ip addr add 172.16.0.101/32 dev qg01

ip netns exec router01  iptables -t nat -A OUTPUT -d 172.16.0.101/32  -j DNAT --to-destination 192.168.1.11

ip netns exec router01  iptables -t nat -A PREROUTING -d 172.16.0.101/32 -j DNAT --to-destination 192.168.1.11

ip netns exec router01  iptables -t nat -A POSTROUTING -s 192.168.1.11/32 -j SNAT --to-source 172.16.0.101

ip netns exec router01  iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -j SNAT --to-source 172.16.0.100

测试floating ip

ping 172.16.0.101

如果需要清除nat chain

iptables -t nat -F

ip netns exec router01 iptables -t nat -A OUTPUT -d 192.168.2.102/32 -j DNAT --to-destination 192.168.10.11

ip netns exec router01 iptables -t nat -A PREROUTING -d 192.168.2.102/32 -j DNAT --to-destination 192.168.10.11

ip netns exec router01 iptables -t nat -A POSTROUTING -s 192.168.10.11/32 -j SNAT --to-source 192.168.2.102

ip netns exec router01 ip addr add 192.168.2.103/32 dev qg01

ip netns exec router01 iptables -t nat -A OUTPUT -d 192.168.2.103/32 -j DNAT --to-destination 192.168.10.11

ip netns exec router01 iptables -t nat -A PREROUTING -d 192.168.2.103/32 -j DNAT --to-destination 192.168.10.11

ip netns exec router01 iptables -t nat -A POSTROUTING -s 192.168.10.11/32 -j SNAT --to-source 192.168.2.103

ip netns exec router01 route add default gw 192.168.2.1

ip netns exec router01 route -n

巴特西

neutron之SDN简单测试

模拟分配floating ip 访问instance1

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