libvirt users - Apr 2010 - Windows Client

Having newly compiled a Libvirt on a Windows Vista machine (many thanks to
Matthias Bolte) I have attempted to connect to a remote Ubuntu machine using
virsh.exe.  However, the connection fails as follows:

 

$ virsh -c qemu+tcp:///system

error: unable to connect to libvirtd at 'localhost': errno=10061

error: failed to connect to the hypervisor

 

1.  I have modified /etc/libvirt/libvirt.conf to set listen_tcp=1.

2.  I cannot find /etc/sysconfig/libvirtd so I am unable to set
LIBVIRTD_ARGS="--listen".

 

As stated on a previous post, my background is Windows rather than Linux, so
I am at a loss as to know where to look next.  I would very much appreciate
some guidance.  Many thanks in anticipation...

 

Tim McLeod

 

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On 04/28/2010 03:38 PM, Tim McLeod wrote:
> Having newly compiled a Libvirt on a Windows Vista machine (many thanks
> to Matthias Bolte) I have attempted to connect to a remote Ubuntu
> machine using virsh.exe.  However, the connection fails as follows:
> 
>  
> 
> $ virsh -c qemu+tcp:///system
Well, you have two problems.  The first is that this URI is trying
to connect to the localhost; you need to specify which host you want
to connect to:

$ virsh -c qemu+tcp://ubuntu-host.example.com/system

The second problem...
> 1.  I have modified /etc/libvirt/libvirt.conf to set listen_tcp=1.
> 
> 2.  I cannot find /etc/sysconfig/libvirtd so I am unable to set
> LIBVIRTD_ARGS="--listen".
...is that this setup is not enough.  When using TCP, by default, we
require authentication/encryption to be done via SASL (kerberos).  Your
best bet for production use is going to be to setup TLS (meaning you have
to setup certificates on the destination machine) or setup SASL (meaning
you have to setup sasl on the destination machine).  Instructions for
generating certificates are here:

http://libvirt.org/remote.html#Remote_certificates

(unfortunately setting up SASL is a bit baroque, and I don't remember all
of the ins and outs of it at the moment)

If you just want to *test* using plain TCP, then you'll have to change
auth_tcp = "sasl" to auth_tcp = "none" (and uncomment it) in
/etc/libvirt/libvirtd.conf
on the destination machine (though we don't recommend this setup).

-- 
Chris Lalancette

2010/4/28 Tim McLeod <tim.mcleod at simulamen.eu>:
> Having newly compiled a Libvirt on a Windows Vista machine (many thanks to
> Matthias Bolte)
Nine :)
> I have attempted to connect to a remote Ubuntu machine using
> virsh.exe.? However, the connection fails as follows:
>
>
>
> $ virsh -c qemu+tcp:///system
You need to specify the server in this URI using a hostname or IP
address: qemu+tcp://ubuntu-server.com/system
> error: unable to connect to libvirtd at 'localhost': errno=10061
>
> error: failed to connect to the hypervisor
>
>
>
> 1.? I have modified /etc/libvirt/libvirt.conf to set listen_tcp=1.
You also need to change this

   #auth_tcp = "sasl"

to

   auth_tcp = "none"

to disable SASL authentication/encryption for TCP connections, because
your libvirt on Windows is compiled without SASL support. If you need
the libvirt connections to be encrypted you can switch from TCP to TLS
connections using: qemu+tls://ubuntu-server.com/system
> 2.? I cannot find /etc/sysconfig/libvirtd so I am unable to set
> LIBVIRTD_ARGS="--listen".
>
For Ubuntu packaged libvirt see /etc/default/libvirt-bin and change

   libvirtd_opts="-d"

to

   libvirtd_opts="-d -l"

as the comment suggest and restart libvirtd using

   /etc/init.d/libvirt-bin restart

Now you should be able to connect to the libvirtd on your Ubuntu server.

Matthias