Overview
The Polystack Compute scheduler determines which physical host runs each new instance. Administrators configure the scheduler behavior through host aggregates (logical groupings of hosts with shared properties) and availability zones (fault domains). The Dashboard provides management interfaces for both.Prerequisites
- Administrator access to the Polystack Dashboard (admin view)
Host Aggregates
Host aggregates group compute hosts with shared characteristics (e.g., SSD storage, GPU hardware, high-memory nodes). The scheduler uses aggregate metadata to match instances with compatible hosts.- Dashboard
- CLI
Navigate to Compute > Host Aggregates in the admin sidebar. The Host Aggregate
tab shows:
Available actions:
Create a Host Aggregate
- Dashboard
- CLI
1
Open the Create Aggregate dialog
Navigate to Compute > Host Aggregates. Click Create Host Aggregate.
2
Configure the aggregate
Click Confirm.
Manage Hosts in an Aggregate
- Dashboard
- CLI
Click the More dropdown on an aggregate row and select Manage Host.The dialog shows a multi-select table of all compute hosts (service:
nova-compute).
Currently assigned hosts are pre-selected. Toggle hosts to add or remove them.The table shows: Host, Availability Zone, Admin Status, State, Last Updated.Availability Zones
The Availability Zones tab on the Host Aggregates page shows a read-only list of all configured zones. Zones are created through host aggregates — each aggregate can be associated with one availability zone.Availability zones are a subset of host aggregates. Create an aggregate with a
zone name to define a new availability zone. See
Availability Zones for user-facing
documentation on zone selection during instance launch.
Next Steps
Compute Hosts
Monitor hypervisor resource utilization
Availability Zones
Understand fault domains and zone placement
Live Migration
Move instances between hosts for maintenance
Flavors
Create flavors with aggregate-matching extra specs