9:41 a.m.
----- Original Message -----
I am trying to set up a testing network using o-virt, but the
networking is
refusing to cooperate. I am testing for possible use in two different
production setups.
My previous experience has been with VMWare. I have always set up a single
bridged network on each host. All my hosts, VMs, and non-VM computers were
peers on the LAN. They could all talk to each other, and things worked very
well. There was a firewall/gateway that provided access to the Internet, and
hosts, VMs, and could all communicate with the Internet as needed.
o-virt seems to be compartmentalizing things beyond all reason.
Is there any way to set up simple networking, so ALL computers can see each
other?
Is there anywhere that describes the philosophy behind the networking setup?
What reason is there that networks are so divided?
Yes there is lack of documentation in this area, it's a shame but given it's an
open source project with an open wiki, everyone is invited to contribute and
improve this.
I'll see if I can get a page started..
After banging my head against the wall trying to configure just one host, I
am very frustrated. I have spent several HOURS Googling for a coherent
explanation of how/why networking is supposed to work, but only fine obscure
references like "letting non-VMs see VM traffic would be a huge security
violation". I have no concept of what king of an installation the o-virt
designers have in mind, but it is obviously worlds different from what I am
trying to do.
The best I can tell, o-virt networking works like this (at least when you
have only one NIC):
there must be an ovirtmgt network, which cannot be combined with any other
network.
the ovirtmgt network cannot talk to VMs (unless that VM is running the
engine)
the ovirtmgt network can only talk to hosts, not to other non-VM
computers
a VM network can talk only to VMs
cannot talk to hosts
cannot talk to non-VMs
hosts cannot talk to my LAN
hosts cannot talk to VMs
VMs cannot talk to my LAN
All of the above are enforced by a boatload of firewall rules that o-virt
puts into every host and VM under its jurisdiction.
Not sure what you mean by all these "restrictions", from what I know the
firewall
rules that are set on each host are to allow host to talk to engine
(ssh, vdsm, VM consoles traffic, etc) no more no less..
Usually the default behavior of firewall is to block almost all communication so
when you add a host and check the "Configure firewall" box it modifies it so
that
your host can function properly.
oVirt has no sense of firewall otherwise. For all it cares you can turn it off
completely, or configure it by yourself (manually or via puppet/chef/foreman/etc)
and not use the capability of the system to configure it for you.
You can also change it so that it uses the rules you want by modifying
IPTablesConfig via engine-config tool.
All of the above is inferred from things I Googled, because I can't find
anywhere that explains what or how things are supposed to work--only things
telling people WHAT THEY CANT DO. All I see on the mailing lists is people
getting their hands slapped because they are trying to do SIMPLE SETUPS that
should work, but don't (due to either design restrictions or software bugs).
What slaps did you see?
What simple setups don't work?
My use case A:
* My (2 or 3) hosts have only one physical NIC.
* My VMs exist to provide services to non-VM computers.
* The VMs do not run X-windows, but they provide GUI programs to
non-VMs via "ssh -X" connections.
* MY VMs need access to storage that is shared with hosts and non-VMs on
the LAN.
Your VMs will be sitting on the ovirtmgmt network, or on a VLAN?
If you want to use VLANs for the VM traffic, you can configure the management
network to be non-VM thus allowing you to put VLANs on the same NIC this
network is occupying (just make sure to sync it first, because changes aren't
applied automatically to the hosts, yet).
In my small setup, the VMs are not on VLAN and can talk to all other machines
on the LAN via SSH and I didn't configure anything special on host level..
Is there some way to TURN OFF network control in o-virt? My systems are
small and static. I can hand-configure the networking a whole lot easier
than I can deal with o-virt (as I have used it so far). Mostly I would need
to be able to turn off the firewall rules on both hosts and VMs.
banging head against wall,
Try not to break the wall (or your head) ;)
Ted
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