ovn gateway出网方案，以及fip

环境

集群

节点	ip 1	ip 2	组件
master01	172.31.133.26/26	172.31.133.90/26	ovn-central(nb,sb,northd)
node01	172.31.133.27/26	172.31.133.91/26	controller,ovs(vswtichd,db)
node02	172.31.133.28/26	172.31.133.92/26	controller,ovs(vswtichd,ovsdb)

ovn初始环境

一个逻辑交换机bridge0 和一个逻辑路由器router0，交换机上挂了容器化的虚机vm0 172.66.1.12

网络配置

# add the router
ovn-nbctl lr-add router0

# create router port for the connection to 'bridge0'
ovn-nbctl lrp-add router0 router1-bridge0 04:ac:10:ff:34:00 172.66.1.10/24

# create the 'bridge0' switch port for connection to 'router0'
ovn-nbctl lsp-add bridge0 bridge0-router0
ovn-nbctl lsp-set-type bridge0-router0 router
ovn-nbctl lsp-set-addresses bridge0-router0 04:ac:10:ff:34:00
ovn-nbctl lsp-set-options bridge0-router0 router-port=router0-bridge0

ovn-nbctl show

router dfecb747-b655-42d8-a63b-54aad5123ab6 (router0)
    port router0-bridge0
        mac: "04:ac:10:ff:34:00"
        networks: ["172.66.1.10/24"]
switch b60a46af-de3a-44c2-ac88-4426fa004140 (bridge0)
    port bridge0-vm0
        addresses: ["dynamic"]
    port bridge0-router0
        type: router
        router-port: router0-bridge0

ovs-sbctl show

Chassis "aa8648e9-e367-4992-9d87-e96b99993ccc"
    hostname: "node01"
    Encap geneve
        ip: "172.31.133.27"
        options: {csum="true"}
Chassis "76dc7a18-0b4e-4a25-84c8-5fce4578cf78"
    hostname: "node02"
    Encap geneve
        ip: "172.31.133.28"
        options: {csum="true"}
    Port_Binding "bridge0-vm0"

gateway

网络拓扑图

文本流程图

         __________ 
        | enp6s0f1 |  Physical Network
         ----------
             |
         ____|_____ 
        |  bridge  |  br-ex 172.31.133.92/26 
         ----------
         ____|____ 
        |  switch |   outside
         ---------
             |
         ____|____ 
        |  router |   gw1 port 'gw1-outside': 172.31.133.95/26  nat
         ---------        port 'gw1-join':    192.168.255.1/24
         ____|____ 
        |  switch |   join  192.168.255.0/24
         ---------  
         ____|____ 
        |  router |   router0 port 'router0-join':  192.168.255.2/24
         ---------            port 'router0-bridge0': 172.66.1.10/24
             |
         ____|____ 
        |  switch |   bridge0 172.66.1.0/24
         ---------  
         /       \
 _______/_       _\_______  
|  vm0    |     |   vm1   |
 ---------       ---------
172.66.1.12      172.66.1.13

网络配置

STEP1

创建并连接交换机join和路由器gw1。

# gw1 join, chassis is master02's id
ovn-nbctl create Logical_Router name=gw1 options:chassis=76dc7a18-0b4e-4a25-84c8-5fce4578cf78
ovn-nbctl ls-add join

# link gw1 and join 
ovn-nbctl lrp-add gw1 gw1-join 02:ac:10:ff:ff:01 192.168.255.1/24
ovn-nbctl lsp-add join join-gw1
ovn-nbctl lsp-set-type join-gw1 router
ovn-nbctl lsp-set-addresses join-gw1 02:ac:10:ff:ff:01
ovn-nbctl lsp-set-options join-gw1 router-port=gw1-join

连接交换机join和路由器router0

#link join and router0
ovn-nbctl lrp-add router0 router0-join 02:ac:10:ff:ff:02 192.168.255.2/24
ovn-nbctl lsp-add join join-router0
ovn-nbctl lsp-set-type join-router0 router
ovn-nbctl lsp-set-addresses join-router0 02:ac:10:ff:ff:02
ovn-nbctl lsp-set-options join-router0 router-port=router0-join

添加路由

# add route for gw1 and router0
ovn-nbctl lr-route-add gw1 "172.66.1.0/24" 192.168.255.2
ovn-nbctl lr-route-add router0 "0.0.0.0/0" 192.168.255.1

STEP2

创建交换机outside并连接路由器gw1

# create new port on router 'gw1'
ovn-nbctl lrp-add gw1 gw1-outside 02:0a:7f:18:01:02 172.31.133.95/26

# create new logical switch and connect it to 'gw1'
ovn-nbctl ls-add outside
ovn-nbctl lsp-add outside outside-gw1
ovn-nbctl lsp-set-type outside-gw1 router
ovn-nbctl lsp-set-addresses outside-gw1 02:0a:7f:18:01:02
ovn-nbctl lsp-set-options outside-gw1 router-port=gw1-outside

STEP3

创建ovs网桥br-ex，并关联逻辑交换机outside

# create localnet port on 'outside'. set the network name to "phyNet"
ovn-nbctl lsp-add outside outside-localnet
ovn-nbctl lsp-set-addresses outside-localnet unknown
ovn-nbctl lsp-set-type outside-localnet localnet
ovn-nbctl lsp-set-options outside-localnet network_name=phyNet

# on node02 
# create a bridge , then mapping outside port
ovs-vsctl add-br br-ex
ip link set br-ex up 
ovs-vsctl set Open_vSwitch . external-ids:ovn-bridge-mappings=phyNet:br-ex

将enp6s0f1挂到ovs网桥上，并将网卡的ip给网桥

# on node02
# add nic for birdge, then set ip 
ovs-vsctl add-port br-ex enp6s0f1
ip addr del 172.31.133.92/26 dev enp6s0f1
ip addr add 172.31.133.92/26 dev br-ex

# add route on node02
ip route add 172.66.1.0/24 via 172.31.133.95 dev br-ex

STEP4

通过snat实现访问外网。通过dnat_and_snat实现fip

# snat 连外网
ovn-nbctl -- --id=@nat create nat type="snat" logical_ip=172.66.1.0/24 external_ip=172.31.133.95 -- add logical_router gw1 nat @nat
# fip
ovn-nbctl -- --id=@nat create nat type="dnat_and_snat" logical_ip=172.66.1.12 external_ip=172.31.133.96 -- add logical_router gw1 nat @nat

查看 snat 和 dnat_and_snat

[root@master01 /]#  ovn-nbctl lr-nat-list gw1
TYPE             EXTERNAL_IP        LOGICAL_IP            EXTERNAL_MAC         LOGICAL_PORT
dnat_and_snat    172.31.133.96      172.66.1.12
snat             172.31.133.95      172.66.1.0/24

验证

在vm0里ping node01

注：此环境中enp6s0f1无法连通外网，不然可以在vm0中ping通外网

[root@master01 ovn]# virtctl console vm0
[root@vm0 ~]# 
[root@vm0 ~]# ping 172.31.133.91
PING 172.31.133.91 (172.31.133.91) 56(84) bytes of data.
64 bytes from 172.31.133.91: icmp_seq=1 ttl=62 time=1.38 ms
64 bytes from 172.31.133.91: icmp_seq=2 ttl=62 time=0.396 ms
 
--- 172.31.133.91 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 0.396/0.889/1.383/0.494 ms
[root@vm0 ~]# 

在master01上ping fip 172.31.133.96

[root@master01 home]# ping 172.31.133.96
PING 172.31.133.96 (172.31.133.96) 56(84) bytes of data.
64 bytes from 172.31.133.96: icmp_seq=1 ttl=62 time=2.04 ms
64 bytes from 172.31.133.96: icmp_seq=2 ttl=62 time=0.530 ms
^C
--- 172.31.133.96 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 0.530/1.285/2.041/0.756 ms
[root@master01 home]#