neutron之SDN简单测试

时间 2019-11-11

标签 neutron sdn 简单测试繁體版

原文原文链接

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

本文旨在经过本身搭建相似neutron （openvswitch + gre）实现SDN 的环境，学习了解其工做原理，模拟核心原理，好比：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。linux

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

###主机网卡配置github

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)网络

模拟Network 节点相关实现，好比L三、dhcp-agent实现，为了模拟多节点网络状况，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。hexo

网络接口配置dom

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post

service network restart

安装须要用到的包学习

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

移除默认的libvirt 网络，方便清晰分析网络状况测试

virsh net-destroy default virsh net-autostart --disable default virsh net-undefine default

设置容许ipforwarding

vi /etc/sysctl.conf net.ipv4.ip_forward=1 net.ipv4.conf.all.rp_filter=0 net.ipv4.conf.default.rp_filter=0

当即生效

sysctl -p

启动openvswitch

service openvswitch start chkconfig openvswitch on

建立一个linux bridge

brctl addbr qbr01 ip link set qbr01 up

建立一个instance，并链接到qbr01 Bridge，网络接口部分配置以下

<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>

能够参考附件./gre/instance1.xml建立

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 之后,登陆添加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

建立一个内部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

建立一个veth peer，链接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

查看如今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

安装须要用到的包

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

设置容许ipforwarding

vi /etc/sysctl.conf net.ipv4.ip_forward=1 net.ipv4.conf.all.rp_filter=0 net.ipv4.conf.default.rp_filter=0

当即生效

sysctl -p

启动openvswitch

service openvswitch start chkconfig openvswitch on

建立一个linux bridge

brctl addbr qbr02 ip link set qbr02 up

建立一个vm，并链接到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，能够参考附件./gre/instance2.xml建立

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 之后,登陆添加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

建立一个内部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

建立一个veth peer，链接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

查看如今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

##经过 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 中建立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

##经过 Network Namespace 和Iptables 实现L3 router

ovs-vsctl add-br br-ex

从新配置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，做为私有网络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

若是须要清除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