[ovirt-devel] [ovirt-system-tests] ssh to an oVirt VM in Lago

[Yaniv Kaul]

On Tue, Jun 6, 2017 at 11:26 AM, Milan Zamazal <mzamazal at redhat.com> wrote:

> Valentina Makarova <makarovavs07 at gmail.com> writes:
>
> > I may use a pakamiko only like this :
> > https://github.com/vmakarova/ovirt-system-tests/commit/
> > 3e9e5ce697da7e0567aaad8397fa886469bc5ae3
> > Lago also use pakamiko, so there is not new dependencies.
> >
> > Is this a good way?
>
> If we don't have higher level means to access VMs via ssh in
> Lago/Ovirt-System-Tests (do we?) then I'd say using paramiko is fine.
>
> > And few more questions about tests and ovirt network.
> >
> > 1) This address of vm0 192.168.201.213. What is this addres? Why it is
> > ip of 'vm0'?  What gave it to vm0 and how the user may to understand
> > that the address would be that?  There is not this ip in virsh
> > net-list and net-dumpxml
>
> It's probably obtained from DHCP, it's in the DHCP range specified in
> LagoInitFile (*.100-*.254).
>
> > 2) In test vm_run (004_basic_sanity) we configure interface eth0 on
> > vm0 with ip 192.168.200.200.  But this interface is unreacheble from
> > engine-host.And when I ask vm0 'ip address' via ssh, there is not
> > interface eth1 there. What for does test add it, if it does not work?
> > Should it work?  And why test finished successful if eth0 was not
> > configured according a start_params?
>
> Good questions.  The complex setup in vm_run looks somewhat mysterious.
> But we should be able to use the Yaniv's suggestion:
>
> > 2017-05-31 23:06 GMT+03:00 Yaniv Kaul <ykaul at redhat.com>:
>
> [...]
>
> >> We can add a fake entry in Lago init file just as we do for
> hosted-engine.
> >> Most importantly, it'll create a MAC to IP address mapping in libvirt's
> >> DHCP.
> >> Of course, then we need to use this MAC.
>
> If I understand it correctly:
>
> - We can create a fake VM in LagoInitFile.  How do we specify it's fake,
>   is it the vm-provider entry?
>

Not sure, but here's the example of hosted-engine VM:
  __ENGINE__:
    vm-provider: ssh
    vm-type: ovirt-engine
    distro: el7
    service_provider: systemd
    ssh-password: 123456
    nics:
      - net: __LAGO_NET__
        ip: 192.168.200.99
    metadata:
      ovirt-engine-password: 123



>
> - If we assign IP to that VM, the mapping for DHCP is automatically
>   created, and the MAC address is determined by lago.utils.ipv4_to_mac.
>

Or use static IP mapping - see above.


>
> - Then we can specify `nics' parameter to params.VM constructor or to
>   add a NIC to the VM as in add_nic test (but I'm not sure sshd would be
>   available on it in that case).
>

I'd hope so...
Y.


>
> Thanks,
> Milan
>
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