[pve-devel] pve-firewall : vm live migration: rules applied only after vm config file move

Alexandre DERUMIER aderumier at odiso.com
Fri Feb 15 07:07:01 CET 2019


>>Perhaps using Network Namespaces would help? I'd like to see Proxmox officially support them for other reasons, this might be one reason to do. 
>>You could recreate the Network Namespace in the destination for the VM about to be migrated. 

Well, we already have a fwbr created when target vm is starting, so we could detect that to enable rules, even if config file is not present.

but for CT, it's stop/move config/start . so if CT is booting fast, firewall rules could be applied too late.
I think it's same for HA with vm.


----- Mail original -----
De: "Paul Chambers" <bod at bod.org>
À: "Alexandre Derumier" <aderumier at odiso.com>
Cc: "pve-devel" <pve-devel at pve.proxmox.com>
Envoyé: Jeudi 14 Février 2019 20:28:29
Objet: Re: [pve-devel] pve-firewall : vm live migration: rules applied only after vm config file move

Perhaps using Network Namespaces would help? I'd like to see Proxmox officially support them for other reasons, this might be one reason to do. 

You could recreate the Network Namespace in the destination for the VM about to be migrated. 

- Paul 

Alexandre DERUMIER wrote on 2/11/2019 3:05 PM: 



Hi,

Currently pve-firewall only applied vm rules,
for vms where config are local to the node.


That mean that when we do a live migration,
the rules are not apply until the config file is moved. (and vm resume just after).

So, we can have some seconds where the rules are not yet applied.


I'm not sure how we could handle this correctly ?

1) force rules update after the config move but before the resume.(but maybe for complex/big iptables this will give us some seconds of timeout for the vm)

2) update rules during live migration (maybe simply detect if vm process is running (pid ? systemd scope ?), or if vmbrfw device exist ?

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