[openstack-dev] [magnum] Discuss the idea of manually managing the bay nodes

Hongbin Lu hongbin.lu at huawei.com
Sun May 15 22:49:39 UTC 2016

Hi all,

This is a continued discussion from the design summit. For recap, Magnum manages bay nodes by using ResourceGroup from Heat. This approach works but it is infeasible to manage the heterogeneity across bay nodes, which is a frequently demanded feature. As an example, there is a request to provision bay nodes across availability zones [1]. There is another request to provision bay nodes with different set of flavors [2]. For the request features above, ResourceGroup won't work very well.

The proposal is to remove the usage of ResourceGroup and manually create Heat stack for each bay nodes. For example, for creating a cluster with 2 masters and 3 minions, Magnum is going to manage 6 Heat stacks (instead of 1 big Heat stack as right now):
* A kube cluster stack that manages the global resources
* Two kube master stacks that manage the two master nodes
* Three kube minion stacks that manage the three minion nodes

The proposal might require an additional API endpoint to manage nodes or a group of nodes. For example:
$ magnum nodegroup-create --bay XXX --flavor m1.small --count 2 --availability-zone us-east-1 ....
$ magnum nodegroup-create --bay XXX --flavor m1.medium --count 3 --availability-zone us-east-2 ...


[1] https://blueprints.launchpad.net/magnum/+spec/magnum-availability-zones
[2] https://blueprints.launchpad.net/magnum/+spec/support-multiple-flavor

Best regards,
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