networking

[mir]

Will proxmox automatically make a venet for every nic?

Suppose we have a pve with two nic's, eth0 and eth1, will a venet0 connected to eth0 and a venet1 connected to eth1 be configured automatically?

 

[charnov]

The network model primarily uses software bridges to the physical network cards. You can NAT or make a bridge device for your VM to use. See here: http://pve.proxmox.com/wiki/Network_Model for an overview. The network tab is were you create your bridges.

 

[mir]

I was not referring to bridge networks but the internal virtual networks where devices are named venet.

 

[charnov]

Here is the KVM recommended way: http://www.linux-kvm.org/page/Networking#private_virtual_bridge and is done with bridges.

I think Virtual Distributed Ethernet http://vde.sourceforge.net/ is another way but it is not the default with KVM. KVM does not use a software switch or crossbar like Xen or VMWare... well, that's not entirely true. One can use Open vSwitch which has been included with the bleeding edge Linux 3.3 kernel, but it is incompatible with with OpenVZ (which is a custome kernel) at least right now.

 

[CiscOH]

i have a similar question. i created the Virtual interfaces but Proxmox keeps overwriting my changes. What am i missing?

 

[dietmar]

i have a similar question. i created the Virtual interfaces but Proxmox keeps overwriting my changes. What am i missing?

What exactly do we overwrite?

 

[CiscOH]

i created a vlan interface in /etc/network/interfaces and it was removed when i made other changes via the GUI

 

[dietmar]

i created a vlan interface in /etc/network/interfaces and it was removed when i made other changes via the GUI

I need more detailed info - how can I reproduce it?

 

[charnov]

I think he is making changes from the command line and then making changes in the GUI. Without looking at what the GUI does, I am betting that the GUI is not aware of the changes made at the CLI level (at least not without a reboot or restart of networking) and the GUI is operating with a local or cached copy of the settings thus overwriting the changes from the CLI. That's my guess, anyways. Dietmar, does that sound possible?

 

[dietmar]

That's my guess, anyways. Dietmar, does that sound possible?

Maybe. The PVE GUI write everything to /etc/network/interfaces.new. At reboot we copy that file to /etc/network/interfaces, but only if that file is older.

 

[mir]

The important questions here are: How often, and when does the PVE GUI read /etc/network/interfaces? For simple checking the gui could make a hash of the file and then check against this hash - any change reread the file and create a new hash.

 

[dietmar]

The important questions here are: How often, and when does the PVE GUI read /etc/network/interfaces?

We use inotify to detect changes. But feel free to study the source code for details ;-)