Open Stack

Devstack is not meant to be restarted. However, setting the IP address 
on br-ex and bringing it up is normally sufficient to re-establish 
networking. After that, you probably still need to recreate the loop 
devices for Cinder and Swift.

What I don't understand: The external network that Devstack sets up by 
default, named "public", is fake. It's not external, and it's not 
connected to the outside world at all, thus the IP address range of 
172.24.4.0/24. How your instances were able to access the internet 
without any manual tweaking is a mystery to me. If you did some manual 
tweaking, I guess it was lost when you rebooted.

Perhaps you had a non-persistent routing table entry that connected 
172.24.4.0/24 to the outside world?

Bernd.

On 8/22/2020 10:24 AM, 李志远 wrote:
> I'm sorry to disturb you.
> Recently, I tried to install openstack through devstack. When I input 
> "./stack.sh". I can install openstack successfully.
> Then I tried to create a cloud instance and use the public network 
> 172.24.4.0/24 <http://172.24.4.0/24> which is created during 
> installation( this subnet is created by default, I didn't configure 
> network informartion in local.conf before installation). And the 
> instance can access to the Internet smoothly.
> But the instance will not access the Internet when I reboot my server  
> (physical machine). After rebooting, I input "sudo ifconfig br-ex 
> 172.24.4.1/24 <http://172.24.4.1/24> up", the instance can access my 
> server IP, but it can't PING the gateway addresses of my server. Of 
> course, the instance also can't access the Internet. But my server can 
> PING it's gateway and access to the Internet. Finally, the cloud 
> instance can only communicate with my server.
> I tried many methods to restore the network environment of my 
> openstack. But I can't find the reason. So I need your help. I install 
> the version of devstack is stable/train. Thank you very much!
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