[PVE-User] Debian 7 guest losing network

[Eneko Lacunza]

Hi all,

I'm happy to report that this issue seems worked-around, at least. No 
problems since this physical server change more than 3 weeks ago, PVE 
packages are the same on both nodes (details quoted below).

Some more details:

  * "Good" node: Dell T20 Xeon E3-1225v3 4c, 12GB with additional 
Broadcom BCM5720 dual port 1gbit. VM network uses broadcom ethernet 
port. There are 2 other VMs on this node (a nagios host and a DC).

* Previous node: Dell T320 Xeon E5-2407 4c, 12 GB  with 4 Broadcom 
BCM5720 ethernet ports. It has 2 VMs currently (DC + ERP node, incoming 
firewall VM)

* Switch is Allied Telesis AT-GS950/24 (24x1gbit)

There's no bonding involved. VMs are on a small same-node ceph storage, 
we have independent network ports for public and private ceph, no 
problems noticed with Ceph.

I've seen some strange problems with Windows domain netlogon, that 
could  mean network problems with DCs, but those problems if they 
happen, are not permanent. But this happened only in one desktop so 
maybe it's not server-related.

I'm looking forward to further diagnose this problem, what do you think 
could be the reason for losing network in that Debian 7 VM?

Thanks a lot
Eneko

El 02/10/15 a las 09:07, Eneko Lacunza escribió:
> Hi,
>
> I do have some tens too, without problem except this one. I have moved 
> the VM to another physical server in the cluster in case there's some 
> kind of problem with the physical server or switch port (there are 
> another 2 VMs in that original proxmox node, but who knows...).
>
> Evening and night have been good; I'll keep the list up-to-date on 
> this issue.
>
> El 02/10/15 a las 08:03, Alexandre DERUMIER escribió:
>> Hi,
>>
>> thi is really strange, I'm running around 1000 debian vms in production,
>>
>> wheezy with 3.16 kernel or jessie with 3.16, and I never had packets 
>> drop like this.
>>
>> ----- Mail original -----
>> De: "Eneko Lacunza" <elacunza at binovo.es>
>> À: "proxmoxve" <pve-user at pve.proxmox.com>
>> Envoyé: Jeudi 1 Octobre 2015 17:33:38
>> Objet: Re: [PVE-User] Debian 7 guest losing network
>>
>> Hi,
>>
>> Just for the record, I tried with latest backport kernel, but we're
>> seeing the problem yet.
>>
>> Today it has lost network 3 times (the last one with 3.16 bpo kernel),
>> this is a change since the previous about-1-week frequency...
>>
>> Cheers
>> Eneko
>>
>> El 29/09/15 a las 06:11, Alexandre DERUMIER escribió:
>>> Hi,
>>>
>>> Not sure it's related but
>>> I remember some network latency problems with kernel 3.2 from wheezy 
>>> and virtio
>>> nics in the past.
>>> Using kernel 3.16 from backports fixed the problem.
>>>
>>>
>>> ----- Mail original -----
>>> De: "Eneko Lacunza" <elacunza at binovo.es>
>>> À: "proxmoxve" <pve-user at pve.proxmox.com>
>>> Envoyé: Lundi 28 Septembre 2015 17:53:29
>>> Objet: [PVE-User] Debian 7 guest losing network
>>>
>>> Hi all,
>>>
>>> I have a PVE 3.4 node with pve kernel 2.6.32-39 (details below).
>>>
>>> A quite busy Samba server VM is losing network conectivity about every
>>> week since 27th August.
>>> This VM can't ping other network elements, and one can't access the
>>> Samba in the VM nor ping it when this happens.
>>> VM is a security-updated Debian 7. Last apt-get upgrade in the VM 
>>> before
>>> first lost network was on 19th August.
>>>
>>> Last Proxmox update was on 15th June, so I don't really think this is a
>>> Proxmox related issue - but I'm sure there are lot's of Debian 7 VMs 
>>> out
>>> there. Is anyone having this problem? Any idea?
>>>
>>> I tried both e1000 and virtio network adapters, but VM continues to 
>>> lose
>>> network. I do have other 2 Debian 7 hosts in the cluster (one in the
>>> same host), but they are not so busy (and haven't lost network for 
>>> now).
>>>
>>> # pveversion -v
>>> proxmox-ve-2.6.32: 3.4-156 (running kernel: 2.6.32-39-pve)
>>> pve-manager: 3.4-6 (running version: 3.4-6/102d4547)
>>> pve-kernel-2.6.32-39-pve: 2.6.32-156
>>> pve-kernel-2.6.32-29-pve: 2.6.32-126
>>> pve-kernel-2.6.32-34-pve: 2.6.32-140
>>> lvm2: 2.02.98-pve4
>>> clvm: 2.02.98-pve4
>>> corosync-pve: 1.4.7-1
>>> openais-pve: 1.1.4-3
>>> libqb0: 0.11.1-2
>>> redhat-cluster-pve: 3.2.0-2
>>> resource-agents-pve: 3.9.2-4
>>> fence-agents-pve: 4.0.10-2
>>> pve-cluster: 3.0-17
>>> qemu-server: 3.4-6
>>> pve-firmware: 1.1-4
>>> libpve-common-perl: 3.0-24
>>> libpve-access-control: 3.0-16
>>> libpve-storage-perl: 3.0-33
>>> pve-libspice-server1: 0.12.4-3
>>> vncterm: 1.1-8
>>> vzctl: 4.0-1pve6
>>> vzprocps: 2.0.11-2
>>> vzquota: 3.1-2
>>> pve-qemu-kvm: 2.2-10
>>> ksm-control-daemon: 1.1-1
>>> glusterfs-client: 3.5.2-1
>>>
>>> Thanks a lot
>>> Eneko
>>>
>>
>
>


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