Create new g4 flavors to support hypervisor migration from Linuxbridge to OVS Neutron agents
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	taavi
	May 8 2024, 9:56 AM

Description

We have discovered that there's a need to run a single manual database update when migrating an instance from a hypervisor using the current Linuxbridge Neutron agent to the OVS Neutron agent. This is fine (and much better than my initial fears), but requires splitting the hypervisor pool into two with a manual process to migrate instances from Linuxbridge to OVS enabled hypervisors.

I believe the best way to do this is with Nova aggregates and a new set of g4 flavors. These new flavors should be otherwise identical to the current set of g3 (and g2?) flavors except for the Neutron agent selection.

Details

Subject	Repo	Branch	Lines +/-
nova policy: temporarily disable VM resizing	operations/puppet	production	+5 -1
openstack: nova-fullstack: Use g4 flavor	operations/puppet	production	+1 -1
openstack: Drop add_flavor cookbook	cloud/wmcs-cookbooks	main	+1 -200

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Status	Assigned	Task
Open	None	T270694 CloudVPS: introduce tenant networks
Stalled	aborrero	T364725 Migrate Cloud VPS instances to VXLAN based networks
Resolved	Andrew	T326373 Migrate Cloud VPS to Neutron Open vSwitch agent
Resolved	Andrew	T364457 Migrate eqiad1 hypervisors to Neutron OVS agent
Resolved	taavi	T364458 Create new g4 flavors to support hypervisor migration from Linuxbridge to OVS Neutron agents
Resolved	taavi	T365696 Investigate how to run OpenTofu to manage Cloud VPS admin-only resources

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taavi created this task.May 8 2024, 9:56 AM

Seems like Nova (or Placement) do not support a flavor targeting the lack of an aggregate property value on a host. So we will temporarily need to create two aggregates, and once the migration is done we can to remove the OVS/Linuxbridge filters from the flavors and retire those aggregates.

Created new aggregates for testing in codfw1dev:

taavi@cloudcontrol2004-dev ~ $ os aggregate create network-ovs
taavi@cloudcontrol2004-dev ~ $ os aggregate create network-linuxbridge
taavi@cloudcontrol2004-dev ~ $ os aggregate set --property network-agent=ovs network-ovs
taavi@cloudcontrol2004-dev ~ $ os aggregate set --property network-agent=linuxbridge network-linuxbridge
taavi@cloudcontrol2004-dev ~ $ os aggregate add host network-ovs cloudvirt2001-dev
taavi@cloudcontrol2004-dev ~ $ os aggregate add host network-ovs cloudvirt2002-dev
taavi@cloudcontrol2004-dev ~ $ os aggregate add host network-linuxbridge cloudvirt2003-dev
taavi@cloudcontrol2004-dev ~ $ os aggregate add host network-linuxbridge cloudvirt2004-dev
taavi@cloudcontrol2004-dev ~ $ os aggregate add host network-linuxbridge cloudvirt2005-dev
taavi@cloudcontrol2004-dev ~ $ os aggregate add host network-linuxbridge cloudvirt2006-dev

And documented them at https://wikitech.wikimedia.org/wiki/Portal:Cloud_VPS/Admin/Host_aggregates.

taavi opened https://gitlab.wikimedia.org/repos/cloud/cloud-vps/tofu-infra/-/merge_requests/1

Manage new flavors

taavi merged https://gitlab.wikimedia.org/repos/cloud/cloud-vps/tofu-infra/-/merge_requests/1

Manage new flavors

taavi opened https://gitlab.wikimedia.org/repos/cloud/cloud-vps/tofu-infra/-/merge_requests/2

cloudvps_flavors: Support setting per-project flavors per deployment

taavi merged https://gitlab.wikimedia.org/repos/cloud/cloud-vps/tofu-infra/-/merge_requests/2

cloudvps_flavors: Support setting per-project flavors per deployment

Updated existing flavors in codfw1dev:

taavi@cloudcontrol2006-dev ~ $ os flavor list --all -f json | jq -r '.[]|select(.Name | contains("g4") | not).ID' | xargs -L1 sudo wmcs-openstack flavor set --property aggregate_instance_extra_specs:network-agent=linuxbridge