This documentation covers Convox V2, our ECS-based engine. V2 is fully supported and actively maintained. Looking for the Kubernetes-based V3 engine? See docs.convox.com.
MaxAvailabilityZones
The maximum number of Availability Zones that the Rack cluster should use. This controls how many AZs the Rack's subnets and resources are distributed across.
| Setting | Value |
|---|---|
| Default value | 3 |
| Allowed values | 2, 3 |
Use Cases
- Setting to
2in AWS regions that only have two Availability Zones - Reducing to
2to lower cross-AZ data transfer costs in cost-sensitive environments - Updating this value when changing AvailabilityZones to match the new number of AZs specified
Additional Information
When updating the AvailabilityZones parameter to a different set of AZs, you must also set MaxAvailabilityZones to match the quantity of AZs you are selecting.
Using 3 Availability Zones (the default) provides better fault tolerance since your workloads are distributed across more isolated data centers. Only reduce to 2 when necessary due to region limitations or specific cost constraints.
$ convox rack params set MaxAvailabilityZones=2
See Also
