I have answered my own question.
On an XEN kernel, the default hypervisor is XEN and I did not have any
XEN domains.
If I explicitly connect to QEMU - my programs work fine.
I discovered this fact by running the existing programs with
the connect string:
"qemu://steve-1.verizon.net/system"
I then created an XEN domain and when I reconnected with
"xen://steve-1.verizon.net/system"
I received the XEN domain information.
I know this bit of information is very familiar to those who
are experienced in the world of virtual machines. I am passing
the information on for those who are new to this environment.
Thanks
Steve
Date sent: Mon, 14 Jul 2008 12:56:24 -0400
From: Steve Oliphant <sdoliphant@xxxxxxxxxxx>
Subject: [libvirt] listing domains on Fedora 8 XEN kernel
To: libvir-list@xxxxxxxxxx
Send reply to: n2kbd@xxxxxxxx
> I am having a problem being able to get domain information in an Fedora
> 8 XEN environment.The code does not receive an error status on the XEN
> kernel and does not get any information.
>
> The same code running on the non XEN kernel works fine.
>
> I am running default configuration files.
>
> Is this a known issue?
> Do I need to tweak the configuration files?
>
> Is there anything else I need to do get the code to work on the XEN
> kernel? Please point me in the right direction.
>
> If any other information is required to assist in answering my question,
> please let me know.
>
> Thank you in advance for your help.
>
> Steven Oliphant
>
> Software installed:
>
> rpm -qa | grep kernel
>
> kernel-headers-2.6.25.9-40.fc8
> kernel-devel-2.6.23.1-42.fc8
> kernel-2.6.23.1-42.fc8
> kernel-xen-2.6.21-2950.fc8
> kernel-2.6.25.9-40.fc8
> kernel-devel-2.6.25.9-40.fc8
> kernel-xen-2.6.21.7-3.fc8
>
> rpm -qa | grep xen
>
> xen-devel-3.1.2-2.fc8
> xenwatch-0.5.2-2.fc8
> kernel-xen-2.6.21-2950.fc8
> xen-debuginfo-3.1.2-2.fc8
> kernel-xen-2.6.21.7-3.fc8
> xen-libs-3.1.2-2.fc8
> xen-3.1.2-2.fc8
>
> rpm -qa | grep virt
>
> libvirt-devel-0.4.4-1.fc8
> ruby-libvirt-0.0.7-1.fc8
> libvirt-python-0.4.4-1.fc8
> python-virtinst-0.300.2-4.fc8
> virt-manager-0.5.3-2.fc8
> libvirt-debuginfo-0.4.4-1.fc8
> libvirt-0.4.4-1.fc8
>
> Non XEN kernel:
>
> uname -a
> Linux steve-1.verizon.net 2.6.25.9-40.fc8 #1 SMP Fri Jun 27 16:25:53 EDT
> 2008 i686 athlon i386 GNU/Linux
>
> XEN kernel
>
> uname -a
> Linux steve-1.verizon.net 2.6.21.7-3.fc8xen #1 SMP Thu Mar 20 14:57:53
> EDT 2008 i686 athlon i386 GNU/Linux
>
> Code sample:
>
> #include <stdio.h>
> #include <libvirt/libvirt.h>
>
> #define DOMAIN_COUNT 10
>
> /**
> * getInfo:
> *
> * extract the virtual machine information
> */
> static void
> getInfo(void) {
> virConnectPtr conn = NULL; /* the hypervisor connection */
> virDomainPtr dom = NULL; /* the domain being checked */
>
> int ret;
> int id;
> int i, j, k, ids[DOMAIN_COUNT];
>
> char *names[DOMAIN_COUNT];
>
> /* NULL means connect to local Xen hypervisor */
>
> conn = virConnectOpen(NULL);
> if (conn == NULL) {
> fprintf(stderr, "Failed to connect to hypervisor\n");
> goto error;
> }
>
> /* Get the active domain list */
>
> i = virConnectListDomains(conn, &ids[0], DOMAIN_COUNT);
> if (i < 0) {
> fprintf(stderr, "Failed to list the domains\n");
> goto error;
> }
> for (j = 0;j < i;j++) {
> if (ids[j] != 0) {
> id = ids[j];
> fprintf(stdout, "Active Domain: %d\n", id);
> /* Get the information */
>
> }
>
> }
> /* Get defined Domain Names */
>
> ret = virConnectListDefinedDomains (conn, names, DOMAIN_COUNT);
> if (ret < 0) {
> fprintf(stderr, "Failed to get Domain Names\n");
> goto error;
> }
>
> for (k = 0;k < ret;k++) {
> printf("Inactive Domain Name: %s\n", names[k]);
> }
>
>
> error:
> if (dom != NULL)
> virDomainFree(dom);
> if (conn != NULL)
> virConnectClose(conn);
> }
>
> int main() {
>
> getInfo();
>
> return(0);
> }
>
>
> --
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Steve Oliphant - N2KBD
Internet: n2kbd@xxxxxxxx
Packet: N2KBD@WA2SNA.#NNJ.NJ.USA.NOAM
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