Re: [Openstack] looking for a Nova scheduler filter plugin to boot nodes on named hosts
You may find what you want here: http://docs.openstack.org/trunk/openstack-compute/admin/content/ch_scheduling.html On Mon, Oct 15, 2012 at 8:45 PM, Christian Parpart tra...@gmail.com wrote: Hi all, I am looking for a (Essex) Nova scheduler plugin that parses the scheduler_hints to get a hostname of the hypervisor to spawn the actual VM on, rejecting any other node. This allows us to explicitely spawn a VM on a certain host (yes, there are really usecases where you want that). :-) I was trying to build my own and searching around since I couldn't believe I was the only one, but didn't find one yet. Does anyone of you maybe have the skills to actually write that simple plugin, or even maybe knows where such a plugin has already been developed? Many thanks in advance, Christian Parpart. ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp -- *guilherme* \n \tab *maluf* ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] looking for a Nova scheduler filter plugin to boot nodes on named hosts
Hi Christian, I think you might be able to use the existing filters in Essex. For example, you can add the following lines in the nova.conf of the controller host (or where nova-scheduler runs) and restart nova-scheduler: isolated_hosts=nova7 isolated_images=sadsd1e35dfe63 This will allow you to run the image with ID sadsd1e35dfe63 only on the compute host nova7. You can also pass a list of compute servers in the isolated_hosts, if you have the need. I certainly see the use-case for this feature, for example when you want to run Windows based instances and you don't want to buy a Windows datacenter license for each nova-compute host, but only for a few that will run Windows instances. I hope this helps you. On Mon, Oct 15, 2012 at 7:45 PM, Christian Parpart tra...@gmail.com wrote: Hi all, I am looking for a (Essex) Nova scheduler plugin that parses the scheduler_hints to get a hostname of the hypervisor to spawn the actual VM on, rejecting any other node. This allows us to explicitely spawn a VM on a certain host (yes, there are really usecases where you want that). :-) I was trying to build my own and searching around since I couldn't believe I was the only one, but didn't find one yet. Does anyone of you maybe have the skills to actually write that simple plugin, or even maybe knows where such a plugin has already been developed? Many thanks in advance, Christian Parpart. ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] looking for a Nova scheduler filter plugin to boot nodes on named hosts
Hi Christian, For a more general solution you might want to look at the code that supports passing in -availabilty_zone=az:host (look for forced_host in compute/api.py). Currently this is limited to admin, but I think that should be changed to be a specific action that can be controlled by policy (we have a change in preparation for this). Cheers, Phil From: openstack-bounces+philip.day=hp@lists.launchpad.net [mailto:openstack-bounces+philip.day=hp@lists.launchpad.net] On Behalf Of GMI M Sent: 16 October 2012 15:13 To: Christian Parpart Cc: openstack@lists.launchpad.net Subject: Re: [Openstack] looking for a Nova scheduler filter plugin to boot nodes on named hosts Hi Christian, I think you might be able to use the existing filters in Essex. For example, you can add the following lines in the nova.conf of the controller host (or where nova-scheduler runs) and restart nova-scheduler: isolated_hosts=nova7 isolated_images=sadsd1e35dfe63 This will allow you to run the image with ID sadsd1e35dfe63 only on the compute host nova7. You can also pass a list of compute servers in the isolated_hosts, if you have the need. I certainly see the use-case for this feature, for example when you want to run Windows based instances and you don't want to buy a Windows datacenter license for each nova-compute host, but only for a few that will run Windows instances. I hope this helps you. On Mon, Oct 15, 2012 at 7:45 PM, Christian Parpart tra...@gmail.commailto:tra...@gmail.com wrote: Hi all, I am looking for a (Essex) Nova scheduler plugin that parses the scheduler_hints to get a hostname of the hypervisor to spawn the actual VM on, rejecting any other node. This allows us to explicitely spawn a VM on a certain host (yes, there are really usecases where you want that). :-) I was trying to build my own and searching around since I couldn't believe I was the only one, but didn't find one yet. Does anyone of you maybe have the skills to actually write that simple plugin, or even maybe knows where such a plugin has already been developed? Many thanks in advance, Christian Parpart. ___ Mailing list: https://launchpad.net/~openstackhttps://launchpad.net/%7Eopenstack Post to : openstack@lists.launchpad.netmailto:openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstackhttps://launchpad.net/%7Eopenstack More help : https://help.launchpad.net/ListHelp ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] looking for a Nova scheduler filter plugin to boot nodes on named hosts
Hey all,
many thanks for your replies so far.
In general, I must say that there really is an absolute need for explicit
provisioning, that is, deciding by the admin what single host to prefer
(but still to reject when there're just no resources left of course).
- Filter like SameHost filter only works when there is already a host, and
then you've to look up and built up the correlation first (not a big
problem, but doesn't feel comfortable).
- IsolatedHosts filter doesn't make that much sense, as we are using one
general template-%{TIMESTAMP} to bootstrap some node and then set up
everything else inside, and we usually still may have more than one VM on
that compute node (e.g. a memcached VM and a postfix VM).
- availability zones, so I got told, are deprecated already (dunno) and I
can't give every compute node a different availability zone, as - tbh -
that's what I have hostnames for :-)
Philip, I'd really like to dive into developing such a plugin, let's call
it HostnameFilter-plugin, that the operator can pass one (or a set of)
hostname(s) that are allowed to spawn the VM on.
However, I just wrote Python once, and even dislike the syntax a bit, not
saying I hate it, but still :-)
Is there any guide (/tutorial) for reference (or hello_world nova scheduler
plugin) I can look at to learn on how to write such a plugin?
Many thanks for your replies so far,
Christian Parpart.
On Tue, Oct 16, 2012 at 4:22 PM, Day, Phil philip@hp.com wrote:
Hi Christian,
** **
For a more general solution you might want to look at the code that
supports passing in “—availabilty_zone=az:host” (look for forced_host in
compute/api.py). Currently this is limited to admin, but I think that
should be changed to be a specific action that can be controlled by policy
(we have a change in preparation for this).
** **
Cheers,
Phil
** **
*From:* openstack-bounces+philip.day=hp@lists.launchpad.net [mailto:
openstack-bounces+philip.day=hp@lists.launchpad.net] *On Behalf Of *GMI
M
*Sent:* 16 October 2012 15:13
*To:* Christian Parpart
*Cc:* openstack@lists.launchpad.net
*Subject:* Re: [Openstack] looking for a Nova scheduler filter plugin to
boot nodes on named hosts
** **
Hi Christian,
I think you might be able to use the existing filters in Essex.
For example, you can add the following lines in the nova.conf of the
controller host (or where nova-scheduler runs) and restart nova-scheduler:
isolated_hosts=nova7
isolated_images=sadsd1e35dfe63
This will allow you to run the image with ID sadsd1e35dfe63 only on the
compute host nova7.
You can also pass a list of compute servers in the isolated_hosts, if you
have the need.
I certainly see the use-case for this feature, for example when you want
to run Windows based instances and you don't want to buy a Windows
datacenter license for each nova-compute host, but only for a few that will
run Windows instances.
I hope this helps you.
On Mon, Oct 15, 2012 at 7:45 PM, Christian Parpart tra...@gmail.com
wrote:
Hi all,
** **
I am looking for a (Essex) Nova scheduler plugin that parses the
scheduler_hints to get a hostname of the
hypervisor to spawn the actual VM on, rejecting any other node.
** **
This allows us to explicitely spawn a VM on a certain host (yes, there are
really usecases where you want that). :-)
** **
I was trying to build my own and searching around since I couldn't believe
I was the only one, but didn't find one yet.
** **
Does anyone of you maybe have the skills to actually write that simple
plugin, or even maybe knows where such
a plugin has already been developed?
** **
Many thanks in advance,
Christian Parpart.
___
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Post to : openstack@lists.launchpad.net
Unsubscribe : https://launchpad.net/~openstack
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** **
___
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Re: [Openstack] looking for a Nova scheduler filter plugin to boot nodes on named hosts
Hi Chrsitian,
I'm not sure it's a great use case for a scheduler filter, as the filters are
cumulative (so each filter only gets the hosts that the other filters in the
stack have agreed are ok), and even before you get to the filters the host
manager will take out from the list any of the hosts which are marked as
disabled (and one of our use cases is to be able to schedule to a disable host).
The current forcing via the az name seems to me to be in the right place
architecturally - so if we can change that from being admin only to gated on a
specific keystone role (after all we still want to control how can do this)
then it seems to me that all the rest of the capability is already there.
If you want to schedule to a specific subset of hosts then take a look at host
aggregates - these were generalised in Folsom specifically to support this, and
the scheduler is already aggregate aware.
Cheers,
Phil
From: Christian Parpart [mailto:tra...@gmail.com]
Sent: 16 October 2012 15:35
To: Day, Phil
Cc: GMI M; openstack@lists.launchpad.net
Subject: Re: [Openstack] looking for a Nova scheduler filter plugin to boot
nodes on named hosts
Hey all,
many thanks for your replies so far.
In general, I must say that there really is an absolute need for explicit
provisioning, that is, deciding by the admin what single host to prefer (but
still to reject when there're just no resources left of course).
- Filter like SameHost filter only works when there is already a host, and then
you've to look up and built up the correlation first (not a big problem, but
doesn't feel comfortable).
- IsolatedHosts filter doesn't make that much sense, as we are using one
general template-%{TIMESTAMP} to bootstrap some node and then set up
everything else inside, and we usually still may have more than one VM on that
compute node (e.g. a memcached VM and a postfix VM).
- availability zones, so I got told, are deprecated already (dunno) and I can't
give every compute node a different availability zone, as - tbh - that's what I
have hostnames for :-)
Philip, I'd really like to dive into developing such a plugin, let's call it
HostnameFilter-plugin, that the operator can pass one (or a set of) hostname(s)
that are allowed to spawn the VM on.
However, I just wrote Python once, and even dislike the syntax a bit, not
saying I hate it, but still :-)
Is there any guide (/tutorial) for reference (or hello_world nova scheduler
plugin) I can look at to learn on how to write such a plugin?
Many thanks for your replies so far,
Christian Parpart.
On Tue, Oct 16, 2012 at 4:22 PM, Day, Phil
philip@hp.commailto:philip@hp.com wrote:
Hi Christian,
For a more general solution you might want to look at the code that supports
passing in -availabilty_zone=az:host (look for forced_host in
compute/api.py). Currently this is limited to admin, but I think that should
be changed to be a specific action that can be controlled by policy (we have a
change in preparation for this).
Cheers,
Phil
From:
openstack-bounces+philip.day=hp@lists.launchpad.netmailto:hp@lists.launchpad.net
[mailto:openstack-bounces+philip.daymailto:openstack-bounces%2Bphilip.day=hp@lists.launchpad.netmailto:hp@lists.launchpad.net]
On Behalf Of GMI M
Sent: 16 October 2012 15:13
To: Christian Parpart
Cc: openstack@lists.launchpad.netmailto:openstack@lists.launchpad.net
Subject: Re: [Openstack] looking for a Nova scheduler filter plugin to boot
nodes on named hosts
Hi Christian,
I think you might be able to use the existing filters in Essex.
For example, you can add the following lines in the nova.conf of the controller
host (or where nova-scheduler runs) and restart nova-scheduler:
isolated_hosts=nova7
isolated_images=sadsd1e35dfe63
This will allow you to run the image with ID sadsd1e35dfe63 only on the
compute host nova7.
You can also pass a list of compute servers in the isolated_hosts, if you have
the need.
I certainly see the use-case for this feature, for example when you want to run
Windows based instances and you don't want to buy a Windows datacenter license
for each nova-compute host, but only for a few that will run Windows instances.
I hope this helps you.
On Mon, Oct 15, 2012 at 7:45 PM, Christian Parpart
tra...@gmail.commailto:tra...@gmail.com wrote:
Hi all,
I am looking for a (Essex) Nova scheduler plugin that parses the
scheduler_hints to get a hostname of the
hypervisor to spawn the actual VM on, rejecting any other node.
This allows us to explicitely spawn a VM on a certain host (yes, there are
really usecases where you want that). :-)
I was trying to build my own and searching around since I couldn't believe I
was the only one, but didn't find one yet.
Does anyone of you maybe have the skills to actually write that simple plugin,
or even maybe knows where such
a plugin has already been developed?
Many thanks in advance,
Christian Parpart.
___
[Openstack] looking for a Nova scheduler filter plugin to boot nodes on named hosts
Hi all, I am looking for a (Essex) Nova scheduler plugin that parses the scheduler_hints to get a hostname of the hypervisor to spawn the actual VM on, rejecting any other node. This allows us to explicitely spawn a VM on a certain host (yes, there are really usecases where you want that). :-) I was trying to build my own and searching around since I couldn't believe I was the only one, but didn't find one yet. Does anyone of you maybe have the skills to actually write that simple plugin, or even maybe knows where such a plugin has already been developed? Many thanks in advance, Christian Parpart. ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
