Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
Hi Sorry If I didn't understand clearly about it , looks to me the hypervisor itself hosts the instances and it should have a IP with it (like Linux host KVM instances, Linux is the hypervisor, the PC is the host) while the host is physical node and only to be used by 'hypervisor' concept ,so I think maybe we don't need ip for the 'host' ? thanks a lot Best Regards! Kevin (Chen) Ji 纪 晨 Engineer, zVM Development, CSTL Notes: Chen CH Ji/China/IBM@IBMCN Internet: jiche...@cn.ibm.com Phone: +86-10-82454158 Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District, Beijing 100193, PRC From: Lingxian Kong anlin.k...@gmail.com To: OpenStack Development Mailing List (not for usage questions) openstack-dev@lists.openstack.org Date: 12/31/2014 07:22 AM Subject:Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host? Thanks Kevin for your clarification, which further affirms my belief that ip address should be included in the host info. I will contact Jay Pipes on IRC, to see what can I help towards this effort, soon after the New Year's Day in China. :) 2014-12-31 0:34 GMT+08:00 Kevin L. Mitchell kevin.mitch...@rackspace.com: On Tue, 2014-12-30 at 14:52 +0800, Lingxian Kong wrote: Just as what Jay Lau said, 'nova hypervisor-show hypervisor_id' indeed returns host ip address, and there are more other information included than 'nova host-describe hostname'. I feel a little confused about the 'host' and 'hypervisor', what's the difference between them? For cloud operator, maybe 'host' is more usefull and intuitive for management than 'hypervisor'. From the implementation perspective, both 'compute_nodes' and 'services' database tables are used for them. Should them be combined for more common use cases? Well, the host and the hypervisor are conceptually distinct objects. The hypervisor is, obviously, the thing on which all the VMs run. The host, though, is the node running the corresponding nova-compute service, which may be separate from the hypervisor. For instance, on Xen-based setups, the host runs in a VM on the hypervisor. There has also been discussion of allowing one host to be responsible for multiple hypervisors, which would be useful for providers with large numbers of hypervisors. -- Kevin L. Mitchell kevin.mitch...@rackspace.com Rackspace ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Regards! --- Lingxian Kong ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
On Wed, 2014-12-31 at 20:56 +0100, Chen CH Ji wrote: Sorry If I didn't understand clearly about it , looks to me the hypervisor itself hosts the instances and it should have a IP with it (like Linux host KVM instances, Linux is the hypervisor, the PC is the host) while the host is physical node and only to be used by 'hypervisor' concept ,so I think maybe we don't need ip for the 'host' ? thanks a lot The hypervisor hosts the VMs, yes, but the component that sits between the hypervisor and the rest of nova—that is, nova-compute—does not necessarily reside on the hypervisor. It is the nova-compute node (which may be either a VM or a physical host) that is referred to by the nova term host. For KVM, I believe the host is often the same as the hypervisor, meaning that nova-compute runs directly on the hypervisor… but this is not necessarily the case for all virt drivers. For example, the host for Xen-based installations is often a separate VM on the same hypervisor, which would have its own distinct IP address. -- Kevin L. Mitchell kevin.mitch...@rackspace.com Rackspace ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
ok, that make sense to me , thanks a lot Best Regards! Kevin (Chen) Ji 纪 晨 Engineer, zVM Development, CSTL Notes: Chen CH Ji/China/IBM@IBMCN Internet: jiche...@cn.ibm.com Phone: +86-10-82454158 Address: 3/F Ring Building, ZhongGuanCun Software Park, Haidian District, Beijing 100193, PRC From: Kevin L. Mitchell kevin.mitch...@rackspace.com To: openstack-dev@lists.openstack.org Date: 12/31/2014 09:37 PM Subject:Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host? On Wed, 2014-12-31 at 20:56 +0100, Chen CH Ji wrote: Sorry If I didn't understand clearly about it , looks to me the hypervisor itself hosts the instances and it should have a IP with it (like Linux host KVM instances, Linux is the hypervisor, the PC is the host) while the host is physical node and only to be used by 'hypervisor' concept ,so I think maybe we don't need ip for the 'host' ? thanks a lot The hypervisor hosts the VMs, yes, but the component that sits between the hypervisor and the rest of nova―that is, nova-compute―does not necessarily reside on the hypervisor. It is the nova-compute node (which may be either a VM or a physical host) that is referred to by the nova term host. For KVM, I believe the host is often the same as the hypervisor, meaning that nova-compute runs directly on the hypervisor… but this is not necessarily the case for all virt drivers. For example, the host for Xen-based installations is often a separate VM on the same hypervisor, which would have its own distinct IP address. -- Kevin L. Mitchell kevin.mitch...@rackspace.com Rackspace ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
On Dec 31, 2014, at 12:35 PM, Kevin L. Mitchell kevin.mitch...@rackspace.com wrote: but this is not necessarily the case for all virt drivers. For example, the host for Xen-based installations is often a separate VM on the same hypervisor, which would have its own distinct IP address. This is quite similar to how Openstack / xCat / zVM would work together. Cheers, -j ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
Yes, host is from service table and hypervisor is from compute_nodes table, I think that there are some discussion for this in Paris Summit and there might be some change for this in Kilo. - Detach service from compute node: https://review.openstack.org/#/c/126895/ (implementation on a patch series https://review.openstack.org/#/q/status:open+project:openstack/nova+branch:master+topic:bp/detach-service-from-computenode,n,z) https://review.openstack.org/#/q/status:open+project:openstack/nova+branch:master+topic:bp/detach-service-from-computenode,n,z%29 - Goal : Only provide resources to the ComputeNode object, not anything else - The primary goal of this blueprint is to decouple the servicegroup API from the ideas of tracking resources, since they are two wholly separate things I'm not sure if there are some changes for those commands when host was added to compute_nodes table. 2014-12-30 14:52 GMT+08:00 Lingxian Kong anlin.k...@gmail.com: Thanks, Jay Pipes and Jay Lau, for your reply! Just as what Jay Lau said, 'nova hypervisor-show hypervisor_id' indeed returns host ip address, and there are more other information included than 'nova host-describe hostname'. I feel a little confused about the 'host' and 'hypervisor', what's the difference between them? For cloud operator, maybe 'host' is more usefull and intuitive for management than 'hypervisor'. From the implementation perspective, both 'compute_nodes' and 'services' database tables are used for them. Should them be combined for more common use cases? 2014-12-29 21:40 GMT+08:00 Jay Lau jay.lau@gmail.com: Does nova hypervisor-show help? It already include the host ip address. 2014-12-29 21:26 GMT+08:00 Jay Pipes jaypi...@gmail.com: On 12/29/2014 06:51 AM, Lingxian Kong wrote: Hi Stackers: As for now, we can get the 'host name', 'service' and 'availability zone' of a host through the CLI command 'nova host-list'. But as a programmer who communicates with OpenStack using its API, I want to get the host ip address, in order to perform some other actions in my program. And what I know is, the ip address of a host is populated in the 'compute_nodes' table of the database, during the 'update available resource' periodic task. So, is it possible of the community to support it in the future? I apologize if the topic was once covered and I missed it. Hi! I see no real technical reason this could not be done. It would require waiting until all of the API microversioning bits are done, and a micro-increment of the API, along with minimal changes of code in the hosts extension to return the host_ip field from the nova.objects.ComputeNode objects returned to the HostController object. Are you interested in working on such a feature? I would be happy to guide you through the process of making a blueprint and submitting code if you'd like. Just find me on IRC #openstack-nova. My IRC nick is jaypipes. Best, -jay ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Thanks, Jay ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Regards! --- Lingxian Kong ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Thanks, Jay ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
On Tue, 2014-12-30 at 14:52 +0800, Lingxian Kong wrote: Just as what Jay Lau said, 'nova hypervisor-show hypervisor_id' indeed returns host ip address, and there are more other information included than 'nova host-describe hostname'. I feel a little confused about the 'host' and 'hypervisor', what's the difference between them? For cloud operator, maybe 'host' is more usefull and intuitive for management than 'hypervisor'. From the implementation perspective, both 'compute_nodes' and 'services' database tables are used for them. Should them be combined for more common use cases? Well, the host and the hypervisor are conceptually distinct objects. The hypervisor is, obviously, the thing on which all the VMs run. The host, though, is the node running the corresponding nova-compute service, which may be separate from the hypervisor. For instance, on Xen-based setups, the host runs in a VM on the hypervisor. There has also been discussion of allowing one host to be responsible for multiple hypervisors, which would be useful for providers with large numbers of hypervisors. -- Kevin L. Mitchell kevin.mitch...@rackspace.com Rackspace ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
Thanks Kevin for your clarification, which further affirms my belief that ip address should be included in the host info. I will contact Jay Pipes on IRC, to see what can I help towards this effort, soon after the New Year's Day in China. :) 2014-12-31 0:34 GMT+08:00 Kevin L. Mitchell kevin.mitch...@rackspace.com: On Tue, 2014-12-30 at 14:52 +0800, Lingxian Kong wrote: Just as what Jay Lau said, 'nova hypervisor-show hypervisor_id' indeed returns host ip address, and there are more other information included than 'nova host-describe hostname'. I feel a little confused about the 'host' and 'hypervisor', what's the difference between them? For cloud operator, maybe 'host' is more usefull and intuitive for management than 'hypervisor'. From the implementation perspective, both 'compute_nodes' and 'services' database tables are used for them. Should them be combined for more common use cases? Well, the host and the hypervisor are conceptually distinct objects. The hypervisor is, obviously, the thing on which all the VMs run. The host, though, is the node running the corresponding nova-compute service, which may be separate from the hypervisor. For instance, on Xen-based setups, the host runs in a VM on the hypervisor. There has also been discussion of allowing one host to be responsible for multiple hypervisors, which would be useful for providers with large numbers of hypervisors. -- Kevin L. Mitchell kevin.mitch...@rackspace.com Rackspace ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Regards! --- Lingxian Kong ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
[openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
Hi Stackers: As for now, we can get the 'host name', 'service' and 'availability zone' of a host through the CLI command 'nova host-list'. But as a programmer who communicates with OpenStack using its API, I want to get the host ip address, in order to perform some other actions in my program. And what I know is, the ip address of a host is populated in the 'compute_nodes' table of the database, during the 'update available resource' periodic task. So, is it possible of the community to support it in the future? I apologize if the topic was once covered and I missed it. -- Regards! --- Lingxian Kong ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
On 12/29/2014 06:51 AM, Lingxian Kong wrote: Hi Stackers: As for now, we can get the 'host name', 'service' and 'availability zone' of a host through the CLI command 'nova host-list'. But as a programmer who communicates with OpenStack using its API, I want to get the host ip address, in order to perform some other actions in my program. And what I know is, the ip address of a host is populated in the 'compute_nodes' table of the database, during the 'update available resource' periodic task. So, is it possible of the community to support it in the future? I apologize if the topic was once covered and I missed it. Hi! I see no real technical reason this could not be done. It would require waiting until all of the API microversioning bits are done, and a micro-increment of the API, along with minimal changes of code in the hosts extension to return the host_ip field from the nova.objects.ComputeNode objects returned to the HostController object. Are you interested in working on such a feature? I would be happy to guide you through the process of making a blueprint and submitting code if you'd like. Just find me on IRC #openstack-nova. My IRC nick is jaypipes. Best, -jay ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
Does nova hypervisor-show help? It already include the host ip address. 2014-12-29 21:26 GMT+08:00 Jay Pipes jaypi...@gmail.com: On 12/29/2014 06:51 AM, Lingxian Kong wrote: Hi Stackers: As for now, we can get the 'host name', 'service' and 'availability zone' of a host through the CLI command 'nova host-list'. But as a programmer who communicates with OpenStack using its API, I want to get the host ip address, in order to perform some other actions in my program. And what I know is, the ip address of a host is populated in the 'compute_nodes' table of the database, during the 'update available resource' periodic task. So, is it possible of the community to support it in the future? I apologize if the topic was once covered and I missed it. Hi! I see no real technical reason this could not be done. It would require waiting until all of the API microversioning bits are done, and a micro-increment of the API, along with minimal changes of code in the hosts extension to return the host_ip field from the nova.objects.ComputeNode objects returned to the HostController object. Are you interested in working on such a feature? I would be happy to guide you through the process of making a blueprint and submitting code if you'd like. Just find me on IRC #openstack-nova. My IRC nick is jaypipes. Best, -jay ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Thanks, Jay ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
Re: [openstack-dev] [Nova] should 'ip address' be retrived when decribe host?
Thanks, Jay Pipes and Jay Lau, for your reply! Just as what Jay Lau said, 'nova hypervisor-show hypervisor_id' indeed returns host ip address, and there are more other information included than 'nova host-describe hostname'. I feel a little confused about the 'host' and 'hypervisor', what's the difference between them? For cloud operator, maybe 'host' is more usefull and intuitive for management than 'hypervisor'. From the implementation perspective, both 'compute_nodes' and 'services' database tables are used for them. Should them be combined for more common use cases? 2014-12-29 21:40 GMT+08:00 Jay Lau jay.lau@gmail.com: Does nova hypervisor-show help? It already include the host ip address. 2014-12-29 21:26 GMT+08:00 Jay Pipes jaypi...@gmail.com: On 12/29/2014 06:51 AM, Lingxian Kong wrote: Hi Stackers: As for now, we can get the 'host name', 'service' and 'availability zone' of a host through the CLI command 'nova host-list'. But as a programmer who communicates with OpenStack using its API, I want to get the host ip address, in order to perform some other actions in my program. And what I know is, the ip address of a host is populated in the 'compute_nodes' table of the database, during the 'update available resource' periodic task. So, is it possible of the community to support it in the future? I apologize if the topic was once covered and I missed it. Hi! I see no real technical reason this could not be done. It would require waiting until all of the API microversioning bits are done, and a micro-increment of the API, along with minimal changes of code in the hosts extension to return the host_ip field from the nova.objects.ComputeNode objects returned to the HostController object. Are you interested in working on such a feature? I would be happy to guide you through the process of making a blueprint and submitting code if you'd like. Just find me on IRC #openstack-nova. My IRC nick is jaypipes. Best, -jay ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Thanks, Jay ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev -- Regards! --- Lingxian Kong ___ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
