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Thanks for your help, really.
My cluster: 2 controllers nodes, OVS, L3-HA.
All nodes had to be rebooted 
All is working for example with external networks (so dhcp on external networks). 
There are no dead containers, all seems ok.

I try to create a new instance on a L3 network. No ERROR in neutron*.log.
The only error is nova-api.log:

Example:
2022-11-11 08:45:54.452 42 ERROR oslo.messaging._drivers.impl_rabbit [-] [8b6fd776-f096-4c8a-927e-88225a3adb43] AMQP server on 10.0.5.109:5672 is unreachable: <RecoverableConnectionError: unknown error>. Trying again in 1 seconds.: amqp.exceptions.RecoverableConnectionError: <RecoverableConnectionError: unknown error>

But on the first node (10.0.5.109 on the internal network) « netstat -atnp |wc-l »  ———>>> 505 connections

So…. if I backup /etc/kolla, my glance images, my configuration files…
if a do « koll-ansible destroy », is next step « kolla-ansible bootstraps…. » and preaches, and deploy,
or directly deploy ? 

What’s the difference with cleanup-containers ? 



I use this openstack cluster for my students, I have a month to get it working again. I could reinstall everything (and change the operating system) but I don't have time for that.
So I can lose all the users data, if I have my glance images, my flavors, the configuration to hang the ldap, the certificates, I think it will be ok.



Franck VEDEL
> 
> Are you asking how to completely zero out your entire cluster and rebuild it? That seems a bit drastic.
> 
> kolla-ansible destroy will nuke everything. Take a backup of /etc/kolla (or wherever your inventory / globals.yml / passwords/yml is) first. Older versions removed some things there when running destroy and I can't recall when / if that changed.
> 
> How many controllers do you have? 
> 
> Are you using OVS, OVN, or something else? 
> 
> Are you using L3-HA? DVR? 
> 
> Did all nodes have to be rebooted? If not, then which ones?
> 
> Have you confirmed there are no dead containers on any controllers? ( docker ps -a )
> 
> Have you looked in logs for ERROR messages? In particular: neutron-server.log, neutron-dhcp-agent.log, nova-api.log, and nova-compute.log ?
> 
> Strange things happen when time is out of sync. Verify all the nodes synced properly to an NTP server. Big symptom of this is 'openstack hypervisor list' will show hosts going up and down every few seconds.
> 
>  

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