potential quota miscalculation in managed Kubernetes in public cloud

[tobihu]

Have you already contacted our help centre?

• Yes, I have contacted the help centre.

Is there an existing issue for this?

• I have checked the existing issues

Describe the bug

When adding three B2-7 worker nodes with 7GB RAM each to a managed K8s in public cloud in the Frankfurt region with an initial quota of 21GB RAM it will fail.

case 1: (Creating a complete new managed K8s cluster)
When trying to create a new cluster with 3x B2-7 worker nodes (7GB RAM each) it will just fail and it seems that nothing happens. But in fact the manager will try to spawn the cluster without notice anyway.

case 2: (Adding a third worker to an existing 2 node K8s cluster)
I created a 2 node K8s cluster with 2x B2-7 nodes and afterwards tried to add a third B2-7 node. This operation will fail with the message: "Your project’s RAM quota is too low to perform the operation." Although having a quota of 21GB RAM (7GB unused).

Steps To Reproduce

Case 1)

1. Create a new project in public cloud
2. Klick on "Create a Kubernetes Cluster"
3. Fill out all questions
   • Region: Frankfurt
   • Version: 1.27
   • Private Network: none
   • Node Type: B2-7
   • Pool Size: 3 (without auto scaling)
   • Billing: Monthly + Anti Affinity
   • Name your cluster: somename
4. Klick on "Send
5. It will fail with an error and it seems that nothing is done.
6. Go to "Managed Kubernetes Service" and see there is a cluster spawning

Case 2)

1. Create a new project in public cloud
2. Klick on "Create a Kubernetes Cluster"
3. Fill out all questions
   • Region: Frankfurt
   • Version: 1.27
   • Private Network: none
   • Node Type: B2-7
   • Pool Size: 2 (without auto scaling)
   • Billing: Monthly + Anti Affinity
   • Name your cluster: somename
4. Klick on "Send
5. You will get a positive feedback
6. Go to Manages Kubernetes Overview and see there is a cluster spawning with 2 nodes.
7. Wait for it to be spawned completely
8. Klick on the Cluster name and "Node Pools" and "Configure Node pool size"
9. Increase the number of nodes to 3 and hit "save"
10. Receive the error message of too small quota (see pictures below)

Expected Behavior

When having a quota of 21 GB RAM it is expected to fit 3 workers with 7 GB RAM each into this quota.

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Firefox

Which devices are used?

Desktop

Additional information to add?

Edit: added separators for the pictures to better distinguish them

[tobihu]

Little Followup: Creating a third VM B2-7 via horizon is possible, but this does not help in scaling up the managed Kubernetes.