CentOS7上配置Open vSwitch和VXLAN实例

环境

实验环境

主机环境

[yuwh@node0 ~]$ uname -a Linux node0 3.10.0-123.9.3.el7.x86_64 #1 SMP Thu Nov 6 15:06:03 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux [yuwh@node0 ~]$ cat /etc/redhat-release CentOS Linux release 7.0.1406 (Core)

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[ yuwh @ node0 ~ ] $ uname - a Linux node0 3.10.0 - 123.9.3.el7.x86_64 #1 SMP Thu Nov 6 15:06:03 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux [ yuwh @ node0 ~ ] $ cat / etc / redhat - release CentOS Linux release 7.0.1406 ( Core )

Open vSwitch

安装Open vSwitch

[root@node0 ~]# yum -y install wget openssl-devel kernel-devel [root@node0 ~]# yum groupinstall "Development Tools" [root@node0 ~]# yum -y install wget openssl-devel kernel-devel [root@node0 ~]# yum groupinstall "Development Tools" [root@node0 ~]# adduser ovswitch [root@node0 ~]# su - ovswitch [ovswitch@node0 ~]$ wget http://openvswitch.org/releases/openvswitch-2.3.0.tar.gz [ovswitch@node0 ~]$ tar xfz openvswitch-2.3.0.tar.gz [ovswitch@node0 ~]$ mkdir -p ~/rpmbuild/SOURCES [ovswitch@node0 ~]$ cp openvswitch-2.3.0.tar.gz ~/rpmbuild/SOURCES 去除Nicira提供的openvswitch-kmod依赖包，创建新的spec文件 [ovswitch@node0 ~]$ sed 's/openvswitch-kmod, //g' openvswitch-2.3.0/rhel/openvswitch.spec > openvswitch-2.3.0/rhel/openvswitch_no_kmod.spec [ovswitch@node0 ~]$ rpmbuild -bb --without check ~/openvswitch-2.3.0/rhel/openvswitch_no_kmod.spec [ovswitch@node0 ~]$ exit [root@node0 ~]# yum localinstall /home/ovswitch/rpmbuild/RPMS/x86_64/openvswitch-2.3.0-1.x86_64.rpm 安装完成，验证一下： [root@node0 ~]# rpm -qf `which ovs-vsctl` openvswitch-2.3.0-1.x86_64

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[ root @ node0 ~ ] # yum -y install wget openssl-devel kernel-devel [ root @ node0 ~ ] # yum groupinstall "Development Tools" [ root @ node0 ~ ] # yum -y install wget openssl-devel kernel-devel [ root @ node0 ~ ] # yum groupinstall "Development Tools" [ root @ node0 ~ ] # adduser ovswitch [ root @ node0 ~ ] # su - ovswitch [ ovswitch @ node0 ~ ] $ wget http : //openvswitch.org/releases/openvswitch-2.3.0.tar.gz [ ovswitch @ node0 ~ ] $ tar xfz openvswitch - 2.3.0.tar.gz [ ovswitch @ node0 ~ ] $ mkdir - p ~ / rpmbuild / SOURCES [ ovswitch @ node0 ~ ] $ cp openvswitch - 2.3.0.tar.gz ~ / rpmbuild / SOURCES 去除 Nicira提供的 openvswitch - kmod依赖包，创建新的 spec文件 [ ovswitch @ node0 ~ ] $ sed 's/openvswitch-kmod, //g' openvswitch - 2.3.0 / rhel / openvswitch .spec > openvswitch - 2.3.0 / rhel / openvswitch_no_kmod .spec [ ovswitch @ node0 ~ ] $ rpmbuild - bb -- without check ~ / openvswitch - 2.3.0 / rhel / openvswitch_no_kmod .spec [ ovswitch @ node0 ~ ] $ exit [ root @ node0 ~ ] # yum localinstall /home/ovswitch/rpmbuild/RPMS/x86_64/openvswitch-2.3.0-1.x86_64.rpm 安装完成，验证一下： [ root @ node0 ~ ] # rpm -qf `which ovs-vsctl` openvswitch - 2.3.0 - 1.x86_64

启动Open vSwitch

SELinux会影响Open vSwitch的运行，比如报错：
error: /etc/openvswitch/conf.db: failed to lock lockfile (No such file or directory)原因是没有权限修改/etc/openvswitch的owner
如果环境允许可用关掉SELinux；想保持enabled需要做如下修改:

[root@node0 ~]# mkdir /etc/openvswitch [root@node0 ~]# semanage fcontext -a -t openvswitch_rw_t "/etc/openvswitch(/.*)?" [root@node0 ~]# restorecon -Rv /etc/openvswitch 启动服务： [root@node0 ~]# systemctl start openvswitch.service

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[ root @ node0 ~ ] # mkdir /etc/openvswitch [ root @ node0 ~ ] # semanage fcontext -a -t openvswitch_rw_t "/etc/openvswitch(/.*)?" [ root @ node0 ~ ] # restorecon -Rv /etc/openvswitch 启动服务： [ root @ node0 ~ ] # systemctl start openvswitch.service

查看结果：
[root@node0 ~]# systemctl -l status openvswitch.service

配置Open vSwitch

ovs-vsctl add-br ovsbr0

1	ovs - vsctl add - br ovsbr0

去掉NetworkManager

systemctl stop NetworkManager.service systemctl disable NetworkManager.service

1 2	systemctl stop NetworkManager .service systemctl disable NetworkManager .service

改用network.services,修改/etc/sysconfig/network-scripts/下的配置文件
/etc/sysconfig/network-scripts/ifcfg-mgmt0

DEVICE=mgmt0 ONBOOT=yes DEVICETYPE=ovs TYPE=OVSIntPort OVS_BRIDGE=ovsbr0 USERCTL=no BOOTPROTO=none HOTPLUG=no IPADDR0=10.0.0.2 PREFIX0=23

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DEVICE = mgmt0 ONBOOT = yes DEVICETYPE = ovs TYPE = OVSIntPort OVS_BRIDGE = ovsbr0 USERCTL = no BOOTPROTO = none HOTPLUG = no IPADDR0 = 10.0.0.2 PREFIX0 = 23

/etc/sysconfig/network-scripts/ifcfg-ovsbr0

DEVICE=ovsbr0 ONBOOT=yes DEVICETYPE=ovs TYPE=OVSBridge HOTPLUG=no USERCTL=no

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DEVICE = ovsbr0 ONBOOT = yes DEVICETYPE = ovs TYPE = OVSBridge HOTPLUG = no USERCTL = no

/etc/sysconfig/network-scripts/ifcfg-enp2s0f0

TYPE=Ethernet BOOTPROTO=none DEFROUTE=yes IPV4_FAILURE_FATAL=no IPV6INIT=yes IPV6_AUTOCONF=yes IPV6_DEFROUTE=yes IPV6_FAILURE_FATAL=no NAME=enp2s0f0 UUID=d81f76d3-7163-42d3-bc07-d936a8536d17 ONBOOT=yes IPADDR=192.168.3.4 PREFIX=23 GATEWAY=192.168.3.1 DNS1=8.8.8.8 DNS2=4.4.4.4 HWADDR=10:51:72:37:76:04 IPV6_PEERDNS=yes IPV6_PEERROUTES=yes

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TYPE = Ethernet BOOTPROTO = none DEFROUTE = yes IPV4_FAILURE_FATAL = no IPV6INIT = yes IPV6_AUTOCONF = yes IPV6_DEFROUTE = yes IPV6_FAILURE_FATAL = no NAME = enp2s0f0 UUID = d81f76d3 - 7163 - 42d3 - bc07 - d936a8536d17 ONBOOT = yes IPADDR = 192.168.3.4 PREFIX = 23 GATEWAY = 192.168.3.1 DNS1 = 8.8.8.8 DNS2 = 4.4.4.4 HWADDR = 10 : 51 : 72 : 37 : 76 : 04 IPV6_PEERDNS = yes IPV6_PEERROUTES = yes

虚拟机

配置网络

libvirt 默认会启用virbr0来作为虚拟机的网桥并启动DHCPD；删除该网桥，使用ovs bridge来替代：

virsh net-destroy default

1	virsh net - destroy default

vi /etc/libvirt/qemu/CentOS7.xml

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type = 'bridge' >        address = '52:54:00:18:16:99' />        bridge = 'ovsbr0' />        type = 'openvswitch' >          interfaceid = '9beb90bc-20a1-4937-901d-805dd6bba190' />               type = 'virtio' />        type = 'pci' domain = '0x0000' bus = '0x00' slot = '0x03' function = '0x0' />

或者通过virt-manager来配置

配置VXLAN

在ovsbr0中添加接口vxlan0
node0上的配置：注意remote_ip node1的ip：192.168.3.5。

ovs-vsctl add-port ovsbr0 vxlan0 -- set interface vxlan0 type=vxlan options:remote_ip=192.168.3.5

1	ovs - vsctl add - port ovsbr0 vxlan0 -- set interface vxlan0 type = vxlan options : remote_ip = 192.168.3.5

启动两个虚拟机后的配置：

[root@node0 samba]# ovs-vsctl show b15949b6-9d9f-4b14-9fd9-277d2b203376 Bridge "ovsbr0" Port "mgmt0" Interface "mgmt0" type: internal Port "vnet0" Interface "vnet0" Port "vxlan0" Interface "vxlan0" type: vxlan options: {remote_ip="192.168.3.5"} Port "ovsbr0" Interface "ovsbr0" type: internal Port "vnet1" Interface "vnet1" ovs_version: "2.3.0" [root@node0 ~]# ip addr 1: lo: mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: enp2s0f0: mtu 1500 qdisc mq state UP qlen 1000 link/ether 10:51:72:37:76:04 brd ff:ff:ff:ff:ff:ff inet 192.168.3.4/23 brd 192.168.3.255 scope global enp2s0f0 valid_lft forever preferred_lft forever inet6 fe80::1251:72ff:fe37:7604/64 scope link valid_lft forever preferred_lft forever 8: ovs-system: mtu 1500 qdisc noop state DOWN link/ether 02:32:3a:73:15:08 brd ff:ff:ff:ff:ff:ff //删掉了不相干部分 48: ovsbr0: mtu 1500 qdisc noqueue state UNKNOWN link/ether fe:45:84:ec:7c:43 brd ff:ff:ff:ff:ff:ff inet6 fe80::fc45:84ff:feec:7c43/64 scope link valid_lft forever preferred_lft forever 49: mgmt0: mtu 1500 qdisc noqueue state UNKNOWN link/ether d6:c5:ed:c4:aa:45 brd ff:ff:ff:ff:ff:ff inet 10.0.0.2/23 brd 10.0.1.255 scope global mgmt0 valid_lft forever preferred_lft forever inet6 fe80::d4c5:edff:fec4:aa45/64 scope link valid_lft forever preferred_lft forever 51: vnet1: mtu 1500 qdisc pfifo_fast master ovs-system state UNKNOWN qlen 500 link/ether fe:54:00:13:04:d8 brd ff:ff:ff:ff:ff:ff inet6 fe80::fc54:ff:fe13:4d8/64 scope link valid_lft forever preferred_lft forever 52: vnet0: mtu 1500 qdisc pfifo_fast master ovs-system state UNKNOWN qlen 500 link/ether fe:54:00:18:16:99 brd ff:ff:ff:ff:ff:ff inet6 fe80::fc54:ff:fe18:1699/64 scope link valid_lft forever preferred_lft forever

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[ root @ node0 samba ] #  ovs-vsctl show b15949b6 - 9d9f - 4b14 - 9fd9 - 277d2b203376      Bridge "ovsbr0"          Port "mgmt0"              Interface "mgmt0"                  type : internal          Port "vnet0"              Interface "vnet0"          Port "vxlan0"              Interface "vxlan0"                  type : vxlan                  options : { remote_ip = "192.168.3.5" }          Port "ovsbr0"              Interface "ovsbr0"                  type : internal          Port "vnet1"              Interface "vnet1"      ovs_version : "2.3.0" [ root @ node0 ~ ] # ip addr 1 : lo : < LOOPBACK , UP , LOWER_UP > mtu 65536 qdisc noqueue state UNKNOWN      link / loopback 00 : 00 : 00 : 00 : 00 : 00 brd 00 : 00 : 00 : 00 : 00 : 00      inet 127.0.0.1 / 8 scope host lo        valid_lft forever preferred_lft forever      inet6 :: 1 / 128 scope host        valid_lft forever preferred_lft forever 2 : enp2s0f0 : < BROADCAST , MULTICAST , UP , LOWER_UP > mtu 1500 qdisc mq state UP qlen 1000      link / ether 10 : 51 : 72 : 37 : 76 : 04 brd ff : ff : ff : ff : ff : ff      inet 192.168.3.4 / 23 brd 192.168.3.255 scope global enp2s0f0        valid_lft forever preferred_lft forever      inet6 fe80 :: 1251 : 72ff : fe37 : 7604 / 64 scope link        valid_lft forever preferred_lft forever 8 : ovs - system : < BROADCAST , MULTICAST > mtu 1500 qdisc noop state DOWN      link / ether 02 : 32 : 3a : 73 : 15 : 08 brd ff : ff : ff : ff : ff : ff / /删掉了不相干部分 48 : ovsbr0 : < BROADCAST , MULTICAST , UP , LOWER_UP > mtu 1500 qdisc noqueue state UNKNOWN      link / ether fe : 45 : 84 : ec : 7c : 43 brd ff : ff : ff : ff : ff : ff      inet6 fe80 :: fc45 : 84ff : feec : 7c43 / 64 scope link        valid_lft forever preferred_lft forever 49 : mgmt0 : < BROADCAST , MULTICAST , UP , LOWER_UP > mtu 1500 qdisc noqueue state UNKNOWN      link / ether d6 : c5 : ed : c4 : aa : 45 brd ff : ff : ff : ff : ff : ff      inet 10.0.0.2 / 23 brd 10.0.1.255 scope global mgmt0        valid_lft forever preferred_lft forever      inet6 fe80 :: d4c5 : edff : fec4 : aa45 / 64 scope link        valid_lft forever preferred_lft forever 51 : vnet1 : < BROADCAST , MULTICAST , UP , LOWER_UP > mtu 1500 qdisc pfifo_fast master ovs - system state UNKNOWN qlen 500      link / ether fe : 54 : 00 : 13 : 04 : d8 brd ff : ff : ff : ff : ff : ff      inet6 fe80 :: fc54 : ff : fe13 : 4d8 / 64 scope link        valid_lft forever preferred_lft forever 52 : vnet0 : < BROADCAST , MULTICAST , UP , LOWER_UP > mtu 1500 qdisc pfifo_fast master ovs - system state UNKNOWN qlen 500      link / ether fe : 54 : 00 : 18 : 16 : 99 brd ff : ff : ff : ff : ff : ff      inet6 fe80 :: fc54 : ff : fe18 : 1699 / 64 scope link        valid_lft forever preferred_lft forever

测试

以上配置，只列出了node0的操作过程；node1作同样配置，ip不同而已。

node0内部vm间通信

vm1 ping vm2:

[root@node0_0 ~]# ip addr 1: lo: mtu 65536 qdisc noqueue state UNKNOWN link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00 inet 127.0.0.1/8 scope host lo valid_lft forever preferred_lft forever inet6 ::1/128 scope host valid_lft forever preferred_lft forever 2: eth0: mtu 1500 qdisc pfifo_fast state UP qlen 1000 link/ether 52:54:00:18:16:99 brd ff:ff:ff:ff:ff:ff inet 10.0.0.3/24 brd 10.0.0.255 scope global eth0 valid_lft forever preferred_lft forever inet6 fe80::5054:ff:fe18:1699/64 scope link valid_lft forever preferred_lft forever [root@node0_0 ~]# ping 10.0.0.4 PING 10.0.0.4 (10.0.0.4) 56(84) bytes of data. 64 bytes from 10.0.0.4: icmp_seq=1 ttl=64 time=0.545 ms 64 bytes from 10.0.0.4: icmp_seq=2 ttl=64 time=0.235 ms 64 bytes from 10.0.0.4: icmp_seq=3 ttl=64 time=0.223 ms ^C --- 10.0.0.4 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 1999ms rtt min/avg/max/mdev = 0.223/0.334/0.545/0.149 ms

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[ root @ node0_0 ~ ] # ip addr 1 : lo : < LOOPBACK , UP , LOWER_UP > mtu 65536 qdisc noqueue state UNKNOWN      link / loopback 00 : 00 : 00 : 00 : 00 : 00 brd 00 : 00 : 00 : 00 : 00 : 00      inet 127.0.0.1 / 8 scope host lo        valid_lft forever preferred_lft forever      inet6 :: 1 / 128 scope host        valid_lft forever preferred_lft forever 2 : eth0 : < BROADCAST , MULTICAST , UP , LOWER_UP > mtu 1500 qdisc pfifo_fast state UP qlen 1000      link / ether 52 : 54 : 00 : 18 : 16 : 99 brd ff : ff : ff : ff : ff : ff      inet 10.0.0.3 / 24 brd 10.0.0.255 scope global eth0        valid_lft forever preferred_lft forever      inet6 fe80 :: 5054 : ff : fe18 : 1699 / 64 scope link        valid_lft forever preferred_lft forever [ root @ node0_0 ~ ] # ping 10.0.0.4 PING 10.0.0.4 ( 10.0.0.4 ) 56 ( 84 ) bytes of data . 64 bytes from 10.0.0.4 : icmp_seq = 1 ttl = 64 time = 0.545 ms 64 bytes from 10.0.0.4 : icmp_seq = 2 ttl = 64 time = 0.235 ms 64 bytes from 10.0.0.4 : icmp_seq = 3 ttl = 64 time = 0.223 ms ^ C -- - 10.0.0.4 ping statistics -- - 3 packets transmitted , 3 received , 0 % packet loss , time 1999ms rtt min / avg / max / mdev = 0.223 / 0.334 / 0.545 / 0.149 ms

wireshark抓包,物理网卡上没有对应的流量，vnet0上的包是普通的ICMP包

node0 vm和node1 vm通信

vm1 ping vm3:

[root@node0_0 ~]# ping 10.0.0.34 PING 10.0.0.34 (10.0.0.34) 56(84) bytes of data. 64 bytes from 10.0.0.34: icmp_seq=1 ttl=64 time=1.62 ms 64 bytes from 10.0.0.34: icmp_seq=2 ttl=64 time=0.383 ms ^C --- 10.0.0.34 ping statistics --- 2 packets transmitted, 2 received, 0% packet loss, time 1001ms rtt min/avg/max/mdev = 0.383/1.003/1.623/0.620 ms

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[ root @ node0_0 ~ ] # ping 10.0.0.34 PING 10.0.0.34 ( 10.0.0.34 ) 56 ( 84 ) bytes of data . 64 bytes from 10.0.0.34 : icmp_seq = 1 ttl = 64 time = 1.62 ms 64 bytes from 10.0.0.34 : icmp_seq = 2 ttl = 64 time = 0.383 ms ^ C -- - 10.0.0.34 ping statistics -- - 2 packets transmitted , 2 received , 0 % packet loss , time 1001ms rtt min / avg / max / mdev = 0.383 / 1.003 / 1.623 / 0.620 ms

vnet0上抓到的报文：普通ICMP包

物理网卡上抓到的报文:vxlan封装的ICMP包 frame 18

vxlan格式

vxlan报文解码

用新版本wireshark（1.12.2）查看 frame 18

node0 vm和node1 ovsbr0管理口通信

[root@node0_0 ~]# ping 10.0.0.32 PING 10.0.0.32 (10.0.0.32) 56(84) bytes of data. 64 bytes from 10.0.0.32: icmp_seq=1 ttl=64 time=1.68 ms 64 bytes from 10.0.0.32: icmp_seq=2 ttl=64 time=0.422 ms 64 bytes from 10.0.0.32: icmp_seq=3 ttl=64 time=0.288 ms ^C --- 10.0.0.32 ping statistics --- 3 packets transmitted, 3 received, 0% packet loss, time 2001ms rtt min/avg/max/mdev = 0.288/0.796/1.680/0.627 ms

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[ root @ node0_0 ~ ] # ping 10.0.0.32 PING 10.0.0.32 ( 10.0.0.32 ) 56 ( 84 ) bytes of data . 64 bytes from 10.0.0.32 : icmp_seq = 1 ttl = 64 time = 1.68 ms 64 bytes from 10.0.0.32 : icmp_seq = 2 ttl = 64 time = 0.422 ms 64 bytes from 10.0.0.32 : icmp_seq = 3 ttl = 64 time = 0.288 ms ^ C -- - 10.0.0.32 ping statistics -- - 3 packets transmitted , 3 received , 0 % packet loss , time 2001ms rtt min / avg / max / mdev = 0.288 / 0.796 / 1.680 / 0.627 ms

参考：
https://n40lab.wordpress.com/2014/09/04/openvswitch-2-3-0-lts-and-centos-7/
http://networkstatic.net/configuring-vxlan-and-gre-tunnels-on-openvswitch/
http://www.astroarch.com/2014/06/rhev-upgrade-saga-installing-open-vswitch-on-rhel-7/