Cloud Infrastructure
Azure AKS Cluster Upgrade for a National Certification Board
Clearing subnet and VM-capacity blockers in an AKS upgrade
A national certification board's AKS upgrade was blocked by subnet IP exhaustion and regional VM SKU capacity limits. BaristaLabs expanded the network path, migrated node pools, and completed the Kubernetes upgrade without application downtime.
A National Certification Board
Healthcare & Certification
1 week
6 min read
The Challenge
The organization's Azure Kubernetes Service cluster was running on a deprecated Kubernetes version and needed an upgrade to remain on a supported path. The upgrade was blocked by insufficient subnet IP headroom for rolling node replacement and limited regional capacity for the existing VM SKU.
Our Solution
BaristaLabs analyzed subnet utilization, calculated the IP headroom required for a safe rolling upgrade, provisioned a larger subnet, migrated node pools, selected an available equivalent-performance VM SKU, validated workloads, and completed the Kubernetes version upgrade without application downtime.
Results & Impact
Zero
Downtime
Application downtime during migration and upgrade
Restored
Kubernetes Support
Cluster returned to a vendor-supported Kubernetes version path
Expanded
Subnet Capacity
Additional IP headroom created for rolling upgrades and node scaling
Cleared
Upgrade Path
Future Kubernetes upgrades and node-pool changes no longer blocked by the original constraints
Project Snapshot
Engagement
AKS upgrade remediation
Build Window
1 week
What Shipped
Subnet expansion, node-pool migration, VM SKU change, workload validation, and Kubernetes version upgrade
Client Testimonial
“Our AKS upgrade had been stalled for months due to infrastructure constraints that our internal team couldn't resolve. Barista Labs diagnosed both issues quickly, laid out a clear remediation plan, and executed the entire migration and upgrade with zero downtime. We're now fully compliant and positioned for future growth.”
Director of Technology
Director of Technology, A National Certification Board
Project Details
Difficulty Level
advancedTeam Size
1 person
Services Used
Cloud InfrastructureDevOps ConsultingCustom Solutions
Technologies
Azure Kubernetes ServiceAzure Virtual NetworkKubernetesAzure CLIInfrastructure as CodeContainer Orchestration
Tags
AzureKubernetesAKSCloud MigrationDevOpsInfrastructure
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