Dear Scott and all, Thanks so much Scott for your help.
Regarding the 4th point you described, I checked so much web sites in order to do it, but I still have one issue. In fact, the network is not working continuously. It disconnects frequently and I can not make 2 successive pings. When I set the address for the guest VM, the ping works fine, but after few seconds the network disconnects !! Please any idea to fix this issue ? Best regards 2015-11-23 21:31 GMT+01:00 Scott Lowe <scott.l...@scottlowe.org>: > Please see my responses inline, prefixed by [SL]. > > > > On Nov 23, 2015, at 1:28 PM, David Gabriel <davidgab...@gmail.com> > wrote: > > > > Dear Scott and, > > > > Could you please detail the procedure to ensure the connection between > the different components of my topology ? > > I will opt to the tools you recommend. > > > [SL] Here's a quick overview: > > 1. Install and configure VMware Workstation on Ubuntu on your physical > system. > 2. Install two VMs (I assume running Ubuntu, since that's what you're > already using) and enable nested virtualization support in Workstation for > these VMs. > 3. Install OVS, KVM, Libvirt, etc., into these VMs. > 4. Create nested VMs on each of the virtualized hypervisors, connecting > those VMs to OVS. > > Use <insert search engine of choice> to get more details on any of these > specific steps; they're all pretty well-documented out there. > > Have fun! > > > > Thanks in advance. > > Regards > > > > 2015-11-23 17:57 GMT+01:00 Scott Lowe <scott.l...@scottlowe.org>: > > Please see my responses inline, prefixed by [SL]. > > > > > > > On Nov 23, 2015, at 9:40 AM, David Gabriel <davidgab...@gmail.com> > wrote: > > > > > > Your analysis is very good ! > > > What I want to get is that VM-A (or VM-B,C,D) runs on a separate VM > but if it is not feasible, I can adapt my scenario to the last figure you > made : > > > VM-A VM-B VM-C VM-D > > > | | | | > > > HostMachineVM1 HostMachineVM2 > > > w/ OVS w/ OVS > > > | | > > > | | > > > +-------Hypervisor-------+ > > > I am using Ubuntu and VirtualBox. If you recommand other > distribution/tool I will change my environment. > > > Now could you please tell me how shall I proceed to ensure the > connection in my topology? > > > > > > [SL] Ubuntu+VirtualBox doesn't support nested virtualization, so you > can't build this topology. You'd need to switch to Ubuntu+KVM (and > configure KVM to use nested virtualization, which AFAIK is not the default) > or use VMware Workstation on Linux (which does support nested > virtualization). You are running Ubuntu on the host, so it's possible to go > the Ubuntu+KVM route (but a fair amount more work, TBH). Unless you're > really familiar with Ubuntu+KVM+Libvirt, the easiest route is probably to > switch to VMware Workstation, which would allow you to build this topology > used nested virtualization support. > > > > There *may* be a way to break out VM-A/B/C/D into separate VMs, but as I > pointed out to Hassan in a separate reply that would involve using bridges > to connect VMs to where OVS was running, and that's not a configuration > I've ever tested/used/verified. > > > > > > > > > 2015-11-23 17:11 GMT+01:00 Scott Lowe <scott.l...@scottlowe.org>: > > > Please see my responses inline, prefixed by [SL]. > > > > > > > > > > On Nov 23, 2015, at 8:59 AM, David Gabriel <davidgab...@gmail.com> > wrote: > > > > > > > > Dear Scott, > > > > > > > > Thanks for reactivity. > > > > Since I have only one physical machine so I want to create inside it > : > > > > 1- One VM representing OVS switch #1 > > > > 2- One VM representing OVS switch #2 > > > > 3- One VM representing the host machine #1 connected to OVS switch #1 > > > > 4- One VM representing the host machine #2 connected to OVS switch #2 > > > > > > > > Then I have to ensure the connection between my 2 switches in one > hand. On the other hand I have to connect switch #1 to host #1. And I have > to do same witch switch 2 and host2 > > > > My scenario may be unusual but I have a limitation regarding > physical equipment availability. > > > > > > > > c1 c2 > > > > | | > > > > | | > > > > | | > > > > |ovs1|--------------|ovs2| > > > > | | > > > > | | > > > > | | > > > > HostMachine1 HostMachine2 > > > > > > > > > [SL] Before we go any further let's make sure we understand that OVS > generally exists *inside* the hosts, so your diagram would typically look > something more like this: > > > > > > HostMachine1 HostMachine2 > > > w/ OVS w/ OVS > > > | | > > > | | > > > +----Physical network----+ > > > > > > In your case, you want to run all this virtual because you have > limited physical hardware. No problem. The diagram shifts slightly to look > like this: > > > > > > HostMachineVM1 HostMachineVM2 > > > w/ OVS w/ OVS > > > | | > > > | | > > > +-------Hypervisor-------+ > > > > > > In this case, "hypervisor" could be Linux+KVM, Linux+Xen, ESXi, or any > number of hosted type 2 hypervisors (VirtualBox, Fusion, Workstation, > etc.). *IF* the hypervisor is a Linux variant, then you can use OVS there > to provide connectivity between the VMs; otherwise, you are limited to > whatever the hypervisor provides. > > > > > > Taking this to the next level...*IF* your hypervisor supports what is > known as nested virtualization, then you can run VMs inside the VMs so it > looks something like this: > > > > > > VM-A VM-B VM-C VM-D > > > | | | | > > > HostMachineVM1 HostMachineVM2 > > > w/ OVS w/ OVS > > > | | > > > | | > > > +-------Hypervisor-------+ > > > > > > In this sort of configuration, you can use OVS (inside HostMachineVM1 > and HostMachineVM2) to provide networking connectivity to the nested VMs > (VM-A through VM-D). > > > > > > I *think* this last scenario is probably what you're seeking to do, > but I could be wrong. > > > > > > Does this help at all? > > > > > > > > > > > > > 2015-11-23 16:42 GMT+01:00 Scott Lowe <scott.l...@scottlowe.org>: > > > > Please see my response below. > > > > > > > > > > > > On Nov 23, 2015, at 8:37 AM, David Gabriel <davidgab...@gmail.com> > wrote: > > > >> > > > >> Dears, > > > >> > > > >> I am lookig to define a basic topology including 2 OVS switches and > 2 hosts (each host is connected to one switch). These 4 components > (switches ans hosts) are running in one separate VM. Please tell me how to > connect them in order to ensure the communication in my basic network. > > > >> I checked so many links in the Internet but I didn't find a > holistic tutorial ... > > > >> Regarding the controller I learn how to set it. > > > > > > > > > > > > Generally speaking, OVS runs *in* the host, so I'm a bit unclear on > what you're trying to achieve. Can you elaborate so that we can try to help > you? > > > > -- > > Scott > > > > > >
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