Hugo Pot

The network connection of instance has been lost after restart Nova-Network host


In my consideration , all services should not affect others while restart/stop service within cloud platform...

That means instances connection should be alive while admin restart nova-network host , but it won't work as your expectation. I faced this issue one month ago. And I spend around 1 hour to understand what's going on with this problem.

In regular nova deployment , nova-network host is the gateway of all instances.  This Linux network box works like a router.  So that has a ARP table over the box.

In my test , if the flat_interface(or vlan_interface)  do not auto up after reboot , the box will lose ARP table. And you can not ping or ssh  instance anymore.  While you up the nic manually , you have to wait for ARP rebuild .

Link from http://gigaom.com/cloud/openstack-turns-1-whats-next/?utm_source=earth2tech&utm_medium=specialtopics




OpenStack, the open-source, cloud-computing software project founded by Rackspace and NASA, celebrates its first birthday tomorrow. It has been a busy year for the project, which appears to have grown much fas ter than even its founders expected it would. A year in, OpenStack is still picking up steam and looks not only like an open source alternative to Amazon Web Services and VMware vCloud in the public Infrastructure as a Service space, but also a democratizing force in the private-cloud software space. Let’s take a look at what happened in the past year — at least what we covered — and what to expect in the year to come.

There's a easy way to build UEC tarball for me
From an exist Ubuntu instance......
!!Still in test!!
Very smooth in Maverick , but failed with Natty server b64
===In instance== 1.source novarc to import environment variable
2.bundle a virtual disk, don't specify the kernel id #euca-bundle-vol -d destination_of_img -p name_of_image -s img_size

找我請到IRC的 freenode
#openstack
#openstack-dev 頻道

謝謝.....blogger 這樣討論效率不是很高

ID hugokuo

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The method to bundle WinXP image 


Refference[CSS group] Image management

I'm using WinXP b32 Eng.


On a linux host and kvm is installed inside this machine , Actually , you can use nova-compute node

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The network range is not big enough to fit 256. Network size is 256
Command failed, please check log for more info


https://answers.launchpad.net/nova/+question/163627
https://answers.launchpad.net/nova/+question/163695

As Vish mentioned in the above QA link .

Due to the multi_nic feature support , network creating has some changes .

You have to add a "label" in cmd
example:

Older version
#nova-manage network create 1.2.3.4/24 1 256
Trunk(r1245 for me)
#nova-manage network create label_flag 1.2.3.4/24 1 256

In my knowing , label could be "public" or "private" currently.
Not sure the difference of labels, still seeking more info about this change .
I'll appreciate any further info from you.

The most powerful one of those three network modes in Nova

Let's have a look at VlanManager
Benefits:
Support VPN End user could access their own project instances with VPN feature. Through a cloud-pipe instance which is a simple image include OPENVPN. It make user manage instance easier without lots of public ip.
Isolation Vlan netwotk Per project/Per Vlan , a bunch of instance within a project will not communicate with other project instance.
1. enable Vlan support in kernel root@nova:~# dmesg | grep -i 802 [ 8.346579] 802.1Q VLAN Support v1.8 Ben Greear
If the vlan folder exist , means your kernel support Vlan
root@nova:~# ls -l /proc/net/vlan total 0 -rw------- 1 root root 0 2011-07-05 21:57 config
root@nova:~# modprobe -v 8021q root@nova:~# lsmod | grep 8021q 8021q 24326 0 garp 14471 1 8021q