[CPDEV-98973] Scale Typha replicas to 1 in All-in-One

[ilia1243]

Description

• If Calico Typha is enabled in All-in-One, installation fails.
  • This is caused by [CPDEV-98878] Expect calico-typha pods and deployment if enabled #618 after which we started to expect Typha deployment.
• Calico Typha is not scheduled on control-planes for old Kubernetes versions.

Solution

• Scale Typha replicas to 1 if it is enabled in schemes with 1 Kubernetes node.
• If 2nd Kubernetes node is added, scale replicas to 2 and redeploy calico plugin.
• Add default tolerations to schedule Calico Typha on all nodes for old Kubernetes versions.

How to apply

Run kubemarine migrate_kubemarine --force-apply calico_typha_schedule_control_planes

Test Cases

TestCase 1

Enable Calico Typha in All-in-One.

Steps:

1. Set plugins.calico.typha.enabled to True in All-in-One and install the cluster.

Results:

Before	After
Installation fails	Installation succeeds with 1 deployed Typha replica

TestCase 2

Add 2nd Kubernetes node to All-in-One with Calico Typha enabled.

Steps:

1. Set plugins.calico.typha.enabled to True in All-in-One and install the cluster.
2. Add 2nd Kubernetes node.

ER: calico plugin is redeployed and Calico Typha is scaled to 2 replicas.

TestCase 3

Schedule Calico Typha on control-planes.

Steps:

1. Install cluster of version < v1.26.7 with 3 control planes, and 1 worker.

Before	After
Installation fails with 1 Calico Typha pod being Pending	Installation succeeds with 2 deployed Typha replica

TestCase 4

Migrate Kubemarine.

Steps:

1. Install cluster of version < v1.26.7 with 2 control planes, and 2 workers.

ER: Calico Typha is scheduled on 2 workers.

2. Run kubemarine migrate_kubemarine --force-apply calico_typha_schedule_control_planes
3. Remove 1 worker.

ER: At least 1 Calico Typha pod is scheduled on control plane.

Checklist

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• Integration CI passed
• Unit tests. If Yes list of new/changed tests with brief description
• There is no merge conflicts

Unit tests

test_calico.py - cover new enrichment, and redeploy cases.