Connect the second insance to First_local_net-5 minutes a day to play with OpenStack (83)

650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473115257894051500.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473115257894051500.png "alt=" Image544.5.png "style=" BORDER:0PX;FONT-SIZE:14PX; line-height:1.5; "/>

In the previous section, CIRROS-VM1 was deployed in First_local_net, and a instance is deployed today, and the connectivity of two instance is verified.

In the same way launch instance "CIRROS-VM2"

The assigned IP is 172.16.1.4

650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114737938058850.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114915854003301.jpg "style=" border:0px;white-space:normal;float:none; "/>

CIRROS-VM2 is also schedule to the control node, Virsh list and Brctl show output as follows cirros-vm2 for the tap device tapa5bd3746-3f.

650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114738006006885.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114915946020428.jpg "style=" border:0px;white-space:normal;float:none; "/>

Running Ifconfig,instance on CIRROS-VM2 's console has got the DCHP IP address.

650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114738253093540.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114916036035243.jpg "style=" border:0px;white-space:normal;float:none; "/>

Can Ping the IP address of the CIRROS-VM1 172.16.1.3.

650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114738342017806.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114916207090812.jpg "style=" border:0px;white-space:normal;float:none; "/>

The network structure of the current host is as follows.

650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114738815000583.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114916303044651.jpg "style=" border:0px;white-space:normal;float:none; "/>

Two instance VIF are hung on the same Linux bridge and can communicate with each other.

Here's a question for you to think about:

If CIRROS-VM2 launch is schedule to a compute node instead of a control node, does it get DHCP IP?

Answer:

I can't . Because the DHCP agent is running on the control node, CIRROS-VM2 is located on the local network of the compute nodes, and the two are in different physical nodes. Because the local network traffic can only be confined within this node, the DHCP request sent cannot reach the control node.

Now that we have first_local_net and two instance, the next section will create a second seconde_local_net.

650) this.width=650; "Title=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160822-1471817895244049415.png "src=" http://7xo6kd.com1.z0.glb.clouddn.com/ Upload-ueditor-image-20160906-1473114916477074619.jpg "alt=" Blob.png "style=" border:0px; "/>

Connect the second insance to First_local_net-5 minutes a day to play with OpenStack (83)