Comments (7)
vlerenc
commented on September 15, 2024
1
Ping... cc MCM @PadmaB, @amshuman-kr, @hardikdr, @prashanth26.
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rfranzke
commented on September 15, 2024
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rfranzke
commented on September 15, 2024
FYI: Azure AZs are now supported in Kubernetes 1.12+
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rfranzke
commented on September 15, 2024
@dkistner what do you think?
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dkistner
commented on September 15, 2024
So the main difference to AvailabilitySets is that they give max. 99.95% availability guarantee. With AZ zones we could reach 99.99%. Zones are not available in all regions.
As prerequisite we would need to switch the LoadBalancer SKU from Basic to Standard as only Standard supports zones.
Next issue zones seems not to work in combination with AvailabilitySets AND afaik we need to pass an AvailabilitySet or ScaleSet to the Azure config which we use to configure the control plane components, otherwise the LB backend pool management does not work. But this is something we need to evaluate.
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vlerenc
commented on September 15, 2024
So, AZs have better availability, but are not available everywhere. On the other hand, it doesn't matter s we can't switch anyhow because of the LB backend pool mgmt. That's twisted. Should we cancel the idea then? If we continue, should we drop all regions that don't support it from the default cloud profile so that nobody creates clusters in such regions and we can't migrate them later?
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dkistner
commented on September 15, 2024
As said I would like to evaluate if there is really no way to configure Zones without AvailabilitySets and ScaleSets. Maybe I have next week already more information.
I think when we would move to zones we can only support regions which have zones, otherwise we would need to support two mechanisms to deploy and manage machines (AvailabilitySet for non zone regions and the zone configuration approach without an AvailabilitySet).
The figure shows the availability of zones: https://azure.microsoft.com/en-us/global-infrastructure/regions/
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