[libvirt-users] On which /dev/pts/x is channel source
Jean-Pierre Ribeauville
jpribeauville at axway.com
Wed Aug 26 14:13:06 UTC 2015
Hi,
I just tested by using "unix virtio" channel instead of pty.
It looks easier to handle.
Thx for help.
Regards,
J.P.
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Objet : libvirt-users Digest, Vol 68, Issue 26
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Today's Topics:
1. Isolated networks && test lab (Spanky Horawitz)
2. Re: On which /dev/pts/x is channel source mapped ?
(Pierre Schweitzer)
3. Virtio serial exposition (Jean-Pierre Ribeauville)
4. Re: On which /dev/pts/x is channel source mapped ?
(Daniel P. Berrange)
----------------------------------------------------------------------
Message: 1
Date: Tue, 25 Aug 2015 17:17:56 -0700
From: Spanky Horawitz <shorawitz at gmail.com>
To: libvirt-users at redhat.com
Subject: [libvirt-users] Isolated networks && test lab
Message-ID: <1440548276.17239.68.camel at psdchristensen>
Content-Type: text/plain; charset="utf-8"
I'm trying to migrate my VirtualBox test lab to KVM. In my VB configuration, I have several VM routers with 4 interfaces each. Each router has a bridged interface which connects them all together and to the outside world. I have servers/clients dispersed on each of the other private (Isolated) segments that use the routers as default gateways.
In trying to make this work, I used Virtual Machine Manager to define 3x Virtual Networks (Isolated networks) and created a VM router which has 3 interfaces (192.168.x.1) on each Isolated network and a 4th interface using the br0 interface to get to the outside world. The router is able to connect to the outside world.
Using Virtual Machine Manager, I also created "client" VM and connected it's single interface to one of the Isolated networks. While testing connectivity of the "client" VM to the router, it seems to go straight to the Host (tested using 'ssh 192.168.x.1'.) I'm trying to isolate the networks from the Host and have the router receive packets for the
192.168.x.1 address on the individual Isolated network segments.
Host:
br0 (em1): 192.168.1.16
vibr0 (default): 192.168.122.1
virbr1: 192.168.2.1
virbr2: 192.168.3.1
virbr3: 192.168.4.1
VM router:
eth0: 192.168.1.10
eth1: 192.168.2.1
eth2: 192.168.3.1
eth3: 192.168.4.1
VM client:
eth0: 192.168.3.101
Is there some trick to isolate the Host from the VM's? Is there a comprehensive guide that explains how the networks should be setup (with/without Virtual Machine Manager)? I'm not afraid to get my hands dirty on the console if needed, but GUI's are easier to navigate when you're learning a new technology. I switched to using RemoteBox for managing my VB vm's as it made things a lot easier to deal with than VBoxManage.
Thanks for your help!
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Message: 2
Date: Wed, 26 Aug 2015 13:58:10 +0200
From: Pierre Schweitzer <pierre at reactos.org>
To: Jean-Pierre Ribeauville <jpribeauville at axway.com>,
"libvirt-users at redhat.com" <libvirt-users at redhat.com>
Subject: Re: [libvirt-users] On which /dev/pts/x is channel source
mapped ?
Message-ID: <55DDA9D2.40101 at reactos.org>
Content-Type: text/plain; charset=windows-1252
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Dear Jean-Pierre,
Here, at the ReactOS Foundation, we've hit the same issue with our automated regression testing using KVM (and thus, libvirt).
The solution we use is that we first start the VM and then, we ask libvirt to dump the VM XML and we parse it to get the pts.
I'm not sure whether that's the most efficient method, but at least, that's a method that works.
You can have a look at our code which is GPLv2. It is available here:
https://svn.reactos.org/svn/project-tools/trunk/sysreg2/
More specifically, the part where we ask again for the config happens in kvm.cpp, KVM class, in KVM::GetConsole() function.
I hope it helps. If you need more information, don't hesitate to ask.
Cheers,
On 08/25/2015 05:17 PM, Jean-Pierre Ribeauville wrote:
> Hi,
>
> By adding following lines in a Guest .xml conf file , I'm able to
> send / receive datas between host and this guest.
>
> <channel type='pty'> <target type='virtio'
> name='arbitrary.virtio.serial.port.name'/> <address
> type='virtio-serial' controller='0' bus='0' port='1'/> </channel>
>
> My question is the following :
>
> How may I find to which /dev/pts/x is mapped the source path ( from
> the host point of view) ? I was able to find it by having a look in
> the virt manager GUI , but I want to do it programmatically.
>
> I've tried to force it by specifying a source path in the .xml file
> .... No way
>
>
> Thx for help.
>
> Regards,
>
> J.P. Ribeauville
>
>
> P: +33.(0).1.47.17.27.87
>
>
> Puteaux 3 Etage 5 Bureau 4
>
> jpribeauville at axway.com<mailto:jpribeauville at axway.com>
> http://www.axway.com<http://www.axway.com/>
>
>
>
> P Pensez ? l'environnement avant d'imprimer.
>
>
>
>
>
>
> _______________________________________________ libvirt-users mailing
> list libvirt-users at redhat.com
> https://www.redhat.com/mailman/listinfo/libvirt-users
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- --
Pierre Schweitzer <pierre at reactos.org>
System & Network Administrator
Senior Kernel Developer
ReactOS Deutschland e.V.
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Message: 3
Date: Wed, 26 Aug 2015 12:17:20 +0000
From: Jean-Pierre Ribeauville <jpribeauville at axway.com>
To: "libvirt-users at redhat.com" <libvirt-users at redhat.com>
Subject: [libvirt-users] Virtio serial exposition
Message-ID:
<1051EFB4D3A1704680C38CCAAC5836D279B89B36 at WPTXMAIL1.ptx.axway.int>
Content-Type: text/plain; charset="iso-8859-1"
Hi,
I try to exchange datas between host and Guest by adding these lines in a guest .xml conf file :
<channel type='pty'>
<target type='virtio' name='arbitrary.virtio.serial.port.name'/>
<address type='virtio-serial' controller='0' bus='0' port='1'/>
</channel>
Then /dev/virtio-ports/arbitrary.virtio.serial.port.name is exposed in the guest and a /dev/pts/x is seen as source path on the host.
I checked that on two Linux hosts :
1)
libvirt-daemon-driver-qemu-1.2.8-16.el7_1.3.x86_64
qemu-kvm-1.5.3-86.el7_1.5.x86_64
qemu-kvm-common-1.5.3-86.el7_1.5.x86_64
qemu-guest-agent-2.1.0-4.el7.x86_64
ipxe-roms-qemu-20130517-6.gitc4bce43.el7.noarch
qemu-img-1.5.3-86.el7_1.5.x86_64
Linux sparring 3.10.0-229.el7.x86_64 #1 SMP Thu Jan 29 18:37:38 EST 2015 x86_64 x86_64 x86_64 GNU/Linux
2)
qemu-img-0.12.1.2-2.415.el6.x86_64
qemu-kvm-0.12.1.2-2.415.el6.x86_64
gpxe-roms-qemu-0.9.7-6.10.el6.noarch
Linux orion 2.6.32-431.el6.x86_64 #1 SMP Sun Nov 10 22:19:54 EST 2013 x86_64 x86_64 x86_64 GNU/Linux
The device is only exposed on the guest of the first host .
Is it due to a too old version of qemu and/or Linux on the second host or some packages missing on this second host ?
Thx.
Regards,
J.P. Ribeauville
P: +33.(0).1.47.17.27.87
Puteaux 3 Etage 5 Bureau 4
jpribeauville at axway.com<mailto:jpribeauville at axway.com>
http://www.axway.com<http://www.axway.com/>
P Pensez ? l'environnement avant d'imprimer.
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Message: 4
Date: Wed, 26 Aug 2015 14:37:47 +0100
From: "Daniel P. Berrange" <berrange at redhat.com>
To: Jean-Pierre Ribeauville <jpribeauville at axway.com>
Cc: "libvirt-users at redhat.com" <libvirt-users at redhat.com>
Subject: Re: [libvirt-users] On which /dev/pts/x is channel source
mapped ?
Message-ID: <20150826133747.GM21787 at redhat.com>
Content-Type: text/plain; charset=utf-8
On Tue, Aug 25, 2015 at 03:17:51PM +0000, Jean-Pierre Ribeauville wrote:
> Hi,
>
> By adding following lines in a Guest .xml conf file , I'm able to send / receive datas between host and this guest.
>
> <channel type='pty'>
> <target type='virtio' name='arbitrary.virtio.serial.port.name'/>
> <address type='virtio-serial' controller='0' bus='0' port='1'/>
> </channel>
>
> My question is the following :
>
> How may I find to which /dev/pts/x is mapped the source path ( from the host point of view) ?
You have to queryy the XML from libvirt after the guest has started, at which point libvirt will have filled in the dynamically alllocated pty path.
Honestly, you're probably better off not using type='pty', and instead use type='unix', which lets you specify an explicit UNIX domain socket path upfront, avoiding the whole problem.
Regards,
Daniel
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