[Users] Using python sdk to find the VMs running on a host.
Hi, I am using the ovirt-python-sdk to figure out if the host is idle or not. The way to determine if the host is idle at a given instant is finding out the number of VMs running on it. If the number of VMs = 0 implies host is idle. I was exploring the python sdk to figure out Host-VMs mapping i.e What are the VMs running on the different host. Looks like the only way to find this, is to query each VM in /api/vms list to get the host on which it is running. Is this the right way ? Is there no direct query or REST API to list the VMs running on a given host at that instant. I was looking to get the data center hierarchy structure. Number_of_datacenters | V clusters in each data center | V Hosts in each cluster | V VMs on each host. This kind of mapping as seen on the GUI. Is there any way to obtain the same from the ovirt-python-sdk ? With this information, this would help me write scripts to turn-off my hosts if idle automatically and power them on as required. Regards, Deepthi
On 06/25/2013 07:54 AM, Deepthi Dharwar wrote:
Hi,
I am using the ovirt-python-sdk to figure out if the host is idle or not. The way to determine if the host is idle at a given instant is finding out the number of VMs running on it. If the number of VMs = 0 implies host is idle.
adding michael for the rest of the question, but please note to check for SPM role of a host before assuming it is idle. also, may i ask what you are trying to accomplish (it sounds like a power saving policy)?
I was exploring the python sdk to figure out Host-VMs mapping i.e What are the VMs running on the different host.
Looks like the only way to find this, is to query each VM in /api/vms list to get the host on which it is running.
Is this the right way ? Is there no direct query or REST API to list the VMs running on a given host at that instant.
I was looking to get the data center hierarchy structure. Number_of_datacenters | V clusters in each data center | V Hosts in each cluster | V VMs on each host.
This kind of mapping as seen on the GUI. Is there any way to obtain the same from the ovirt-python-sdk ?
With this information, this would help me write scripts to turn-off my hosts if idle automatically and power them on as required.
Regards, Deepthi
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
On 06/25/2013 11:58 AM, Itamar Heim wrote:
On 06/25/2013 07:54 AM, Deepthi Dharwar wrote:
Hi,
I am using the ovirt-python-sdk to figure out if the host is idle or not. The way to determine if the host is idle at a given instant is finding out the number of VMs running on it. If the number of VMs = 0 implies host is idle.
adding michael for the rest of the question, but please note to check for SPM role of a host before assuming it is idle.
Yes, that is essential. Thanks for pointing it out.
also, may i ask what you are trying to accomplish (it sounds like a power saving policy)?
Yes, I was looking to tweak the power saving policy to switch off hosts that have no VMs running on them. Looks like doing it within the ovirt-engine is better option than through scripts and SDK.
I was exploring the python sdk to figure out Host-VMs mapping i.e What are the VMs running on the different host.
Looks like the only way to find this, is to query each VM in /api/vms list to get the host on which it is running.
Is this the right way ? Is there no direct query or REST API to list the VMs running on a given host at that instant.
I was looking to get the data center hierarchy structure. Number_of_datacenters | V clusters in each data center | V Hosts in each cluster | V VMs on each host.
This kind of mapping as seen on the GUI. Is there any way to obtain the same from the ovirt-python-sdk ?
With this information, this would help me write scripts to turn-off my hosts if idle automatically and power them on as required.
Regards, Deepthi
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
On 06/25/2013 12:30 PM, Deepthi Dharwar wrote:
On 06/25/2013 11:58 AM, Itamar Heim wrote:
On 06/25/2013 07:54 AM, Deepthi Dharwar wrote:
Hi,
I am using the ovirt-python-sdk to figure out if the host is idle or not. The way to determine if the host is idle at a given instant is finding out the number of VMs running on it. If the number of VMs = 0 implies host is idle.
adding michael for the rest of the question, but please note to check for SPM role of a host before assuming it is idle.
Yes, that is essential. Thanks for pointing it out.
also, may i ask what you are trying to accomplish (it sounds like a power saving policy)?
Yes, I was looking to tweak the power saving policy to switch off hosts that have no VMs running on them. Looks like doing it within the ovirt-engine is better option than through scripts and SDK.
you should soon be able to write it via python sdk/scripts integrated with the engine via: http://www.ovirt.org/Features/oVirtSchedulerAPI
I was exploring the python sdk to figure out Host-VMs mapping i.e What are the VMs running on the different host.
Looks like the only way to find this, is to query each VM in /api/vms list to get the host on which it is running.
Is this the right way ? Is there no direct query or REST API to list the VMs running on a given host at that instant.
I was looking to get the data center hierarchy structure. Number_of_datacenters | V clusters in each data center | V Hosts in each cluster | V VMs on each host.
This kind of mapping as seen on the GUI. Is there any way to obtain the same from the ovirt-python-sdk ?
With this information, this would help me write scripts to turn-off my hosts if idle automatically and power them on as required.
Regards, Deepthi
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
On 06/25/2013 09:28 AM, Itamar Heim wrote:
On 06/25/2013 07:54 AM, Deepthi Dharwar wrote:
Hi,
I am using the ovirt-python-sdk to figure out if the host is idle or not. The way to determine if the host is idle at a given instant is finding out the number of VMs running on it. If the number of VMs = 0 implies host is idle.
adding michael for the rest of the question, but please note to check for SPM role of a host before assuming it is idle.
also, may i ask what you are trying to accomplish (it sounds like a power saving policy)?
I was exploring the python sdk to figure out Host-VMs mapping i.e What are the VMs running on the different host.
Looks like the only way to find this, is to query each VM in /api/vms list to get the host on which it is running.
Is this the right way ? Is there no direct query or REST API to list the VMs running on a given host at that instant.
you can run query="host = X" for that.
I was looking to get the data center hierarchy structure. Number_of_datacenters | V clusters in each data center | V Hosts in each cluster | V VMs on each host.
This kind of mapping as seen on the GUI. Is there any way to obtain the same from the ovirt-python-sdk ?
you can combine query to fetch vms by dc+cluster+host, query = "datacenter = x and cluster = y and host = z" also you can fetch hosts from the given cluster cluster=x same for cluster "Datacenter.name = x"
With this information, this would help me write scripts to turn-off my hosts if idle automatically and power them on as required.
Regards, Deepthi
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
-- Michael Pasternak RedHat, ENG-Virtualization R&D
On 06/25/2013 01:34 PM, Michael Pasternak wrote:
On 06/25/2013 09:28 AM, Itamar Heim wrote:
On 06/25/2013 07:54 AM, Deepthi Dharwar wrote:
Hi,
I am using the ovirt-python-sdk to figure out if the host is idle or not. The way to determine if the host is idle at a given instant is finding out the number of VMs running on it. If the number of VMs = 0 implies host is idle.
adding michael for the rest of the question, but please note to check for SPM role of a host before assuming it is idle.
also, may i ask what you are trying to accomplish (it sounds like a power saving policy)?
I was exploring the python sdk to figure out Host-VMs mapping i.e What are the VMs running on the different host.
Looks like the only way to find this, is to query each VM in /api/vms list to get the host on which it is running.
Is this the right way ? Is there no direct query or REST API to list the VMs running on a given host at that instant.
you can run query="host = X" for that.
I was looking to get the data center hierarchy structure. Number_of_datacenters | V clusters in each data center | V Hosts in each cluster | V VMs on each host.
This kind of mapping as seen on the GUI. Is there any way to obtain the same from the ovirt-python-sdk ?
you can combine query to fetch vms by dc+cluster+host,
query = "datacenter = x and cluster = y and host = z"
this is redundnat, since host is in one cluster which is in one datacenter, so just querying on host would give the same result.
also you can fetch hosts from the given cluster
cluster=x
same for cluster
"Datacenter.name = x"
With this information, this would help me write scripts to turn-off my hosts if idle automatically and power them on as required.
Regards, Deepthi
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
On 06/25/2013 04:04 PM, Michael Pasternak wrote:
On 06/25/2013 09:28 AM, Itamar Heim wrote:
On 06/25/2013 07:54 AM, Deepthi Dharwar wrote:
Hi,
I am using the ovirt-python-sdk to figure out if the host is idle or not. The way to determine if the host is idle at a given instant is finding out the number of VMs running on it. If the number of VMs = 0 implies host is idle.
adding michael for the rest of the question, but please note to check for SPM role of a host before assuming it is idle.
also, may i ask what you are trying to accomplish (it sounds like a power saving policy)?
I was exploring the python sdk to figure out Host-VMs mapping i.e What are the VMs running on the different host.
Looks like the only way to find this, is to query each VM in /api/vms list to get the host on which it is running.
Is this the right way ? Is there no direct query or REST API to list the VMs running on a given host at that instant.
you can run query="host = X" for that.
Thanks! I was able to successfully come up with the hierarchy.
I was looking to get the data center hierarchy structure. Number_of_datacenters | V clusters in each data center | V Hosts in each cluster | V VMs on each host.
This kind of mapping as seen on the GUI. Is there any way to obtain the same from the ovirt-python-sdk ?
you can combine query to fetch vms by dc+cluster+host,
query = "datacenter = x and cluster = y and host = z"
also you can fetch hosts from the given cluster
cluster=x
same for cluster
"Datacenter.name = x"
With this information, this would help me write scripts to turn-off my hosts if idle automatically and power them on as required.
Regards, Deepthi
_______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users
participants (3)
-
Deepthi Dharwar -
Itamar Heim -
Michael Pasternak