How virtual machines in OpenStack communicate with physical machines

How-to-connection-ns-outsideEnvironment configuration

Network interface

vi/etc/sysconfig/network-scripts/ifcfg-eth0device=eth0type=ethernetonboot=yesnm_ controlled=yesbootproto=staticipaddr=10.20.0.10netmask=255.255.255.0vi/etc/sysconfig/network-scripts/ ifcfg-eth1device=eth1type=ethernetonboot=yesnm_controlled=yesbootproto=staticipaddr=172.16.0.10netmask= 255.255.255.0vi/etc/sysconfig/network-scripts/ifcfg-eth2device=eth2type=ethernetonboot=yesnm_controlled= yesbootproto=staticipaddr=192.168.4.10netmask=255.255.255.0  

Restart Network Service

service network restart

Create a network namespace foo

ip netns add foo

View Network namespace

ip netns

Create a VETHP

ip link add tap-foo type veth peer name tap-root

assigning Tap-foo to Foo namespace

ip link set tap-foo  netns foo

Add an IP address for Tap-foo

ip netns exec foo ip addr add 192.168.10.2/24 dev tap-foo ip netns exec foo ip link set tap-foo up

View NIC information in Foo space

ip netns exec foo ip a

Add IP to Tap-root in root namespace

 ip addr add 192.168.10.1/24 dev tap-root ip netns exec foo ip link set tap-root up

View network card information in the root space

ip a

Check if network connectivity

 ping 192.168.10.2 ip netns exec foo ping 192.168.10.1

Install the package that needs to be used

yum install libvirt openvswitch python-virtinst xauth tigervnc -y

Remove the default Libvirt network for easy and clear analysis of network conditions

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

Start Openvswitch

service openvswitch startchkconfig openvswitch on

Create a openvswitch bridge called Br-int

ovs-vsctl add-br br-int

Use Openvswitch's br-int to define a libvirt network

vi libvirt-vlans.xml<network> <name>ovs-network</name> <forward mode= ' Bridge '/> <bridge name= ' br-int '/> <virtualport type= ' openvswitch '/> <portgroup name= ' No-vlan ' default= ' yes ' > </portgroup> <portgroup name= ' vlan-100 ' > <vlan> <tag id= ' + '/> < ;/vlan> </portgroup> <portgroup name= ' vlan-200 ' > <vlan> <tag id= ' $ '/> </vlan&  Gt </portgroup></network>  

Start Libvirt Network

virsh net-define libvirt-vlans.xmlvirsh net-autostart ovs-networkvirsh net-start ovs-network

Create a instance, and connect to the Ovs-network, the Network Interface section is configured as follows

<interface type=‘network‘>  <source network=‘ovs-network‘ portgroup=‘vlan-100‘/>  <model type=‘virtio‘/></interface>

You can refer to attachment instance1.xml to create

cp ~/gre/ /var/tmp/cd /var/tmp/gremv cirros-0.3.0-x86_64-disk.img instance1.imgvirsh define instance1.xmlvirsh start instance1virsh vncdesplay instance1vncviewer :0

After you start the console, login to add IP to know 192.168.1.20

ip addr add 192.168.1.20/24 dev eth0

Add a Openvswitch port

ip link add br-int-tap100 type veth peer name tap100ovs-vsctl add-port br-int br-int-tap100ovs-vsctl set port br-int-tap100 tag=100ip addr add 192.168.1.21/24 dev tap100ip link set tap100 upip link set br-int-tap100 up

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

How virtual machines in OpenStack communicate with physical machines