Re: [libvirt-users] Need help regarding perl sys::virt
Daniel,
Could you please help me with the question below. Please let me know if question is not
clear.
Regards,
Rawat
-----Original Message-----
From: Rawat, Vishwanath
Sent: Tuesday, December 18, 2012 4:14 PM
To: 'Daniel P. Berrange'
Cc: libvirt-users(a)redhat.com
Subject: RE: [libvirt-users] Need help regarding perl sys::virt
Hi Daniel,
It means that libvirt (and other related) libs should be installed on both client and
server?
Client is the machine from where connection is made(using $uri) to Remote
machine(server).
Regards,
Rawat
-----Original Message-----
From: Daniel P. Berrange [mailto:berrange@redhat.com]
Sent: Tuesday, December 11, 2012 9:29 PM
To: Rawat, Vishwanath
Cc: libvirt-users(a)redhat.com
Subject: Re: [libvirt-users] Need help regarding perl sys::virt
On Tue, Dec 11, 2012 at 12:46:55PM +0000, Rawat, Vishwanath wrote:
Hi,
I wanted to use perl Sys::Virt (which uses libvirt) to remotely connect
KVM hypervisor. As a start I tried following simple script(KVM.pl) but I am getting
following error.
First it will ask for authentication which I am providing to it manually then it fails.
Do I need to do some configuration on KVM hypervisor before executing this script? Any
help is appreciated.
bash-3.2$ perl KVM.pl
root(a)10.238.132.125's password:
Unable to open connection to qemu+ssh://root@10.238.132.125/system?no_verify=1: End of
file while reading data: Warning: Perm: Input/output error8.132.125' (RSA) to the list
of known hosts.
This is showing that libvirt failed to connect to the remote host.
This is not likely to be related to the Perl bindings. You should check the same conection
using virsh. eg
virsh -c qemu+ssh://root@10.238.132.125/system?no_verify=1 uri
Can't call method "list_domains" on an undefined value
at KVM.pl line 21.
This error is because you failed to connect, but your script ignored the error and carried
on running, instead of exiting.
bash-3.2$
bash-3.2$ cat KVM.pl
use strict;
use warnings;
use Sys::Virt;
use Data::Dump qw(dump);
my $user = "root";
my $host = <some_host>;
my $uri = "qemu+ssh://root\@$host/system?no_verify=1";
my $vmm;
eval {
$vmm = Sys::Virt->new(uri => $uri, readonly => 1); }; if ($@) {
print "Unable to open connection to $uri: " . $@->message .
"\n";
You need to exit at this point, since you have no valid connection
}
>
> for my $dom ($vmm->list_domains, $vmm->list_defined_domains) {
> ## see perldoc Sys::Virt::Domain
> print "name: ", $dom->get_name, "\n";
> print "uuid: ", $dom->get_uuid_string(), "\n";
> ## $dom->get_info returns a hash reference
> dump $dom->get_info;
> print "\n";
}
>
Daniel
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