Tag: Kubernetes
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Security Context Constraints and Pod Admission, the Biggest Portability Gap (TKGI to OpenShift Series, Part 7)
Security Context Constraints reject workloads that ran for years on TKGI, and no migration tool fixes that for you. Field level mapping, five real rejection errors, and the remediation paths ranked by cost.
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Application Assessment and Migration Waves for OpenShift (TKGI to OpenShift Series, Part 6)
Scoring 47 TKGI namespaces on six signals turns a flat inventory into four migration waves. Here is the rubric, the wave rules, and why business criticality is the wrong sort key.
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Inventorying the TKGI Estate (TKGI to OpenShift Series, Part 5)
Before you design an OpenShift target you need an honest picture of what TKGI is actually running. Here is the read only discovery sweep I run across a three cluster estate, and the four things it turns up that nobody expected.
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TKGI and OpenShift Architecture Compared, Component by Component (TKGI to OpenShift Series, Part 2)
A component by component architecture comparison of TKGI and OpenShift Container Platform 4, covering control planes, node lifecycle, networking, admission control and the operational trade offs that decide migration effort.
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What OpenShift Offers a TKGI Estate, and Why TKGI Is Winding Down (TKGI to OpenShift Series, Part 1)
TKGI reaches official End of Support in October 2027 and is already incompatible with VCF 9.1 and NSX 9.1. Here is why OpenShift 4 is a credible landing place, how it maps to what you run today, and the migration tooling assumption that costs teams a sprint.
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Day-2 Operations on VKS, Lifecycle, Upgrades and Scaling vs BOSH (TKGI to VKS Series, Part 24)
After the cutover, Day-2 on VKS replaces BOSH and Ops Manager with a declarative model. Here is how to upgrade Kubernetes versions, scale node pools, and roll back safely, with the commands that map to your old TKGI habits.
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Secrets, Config and CI/CD Pipeline Migration to VKS (TKGI to VKS Series, Part 21)
Move plain secrets and ConfigMaps with Velero, re-seal sealed secrets against VKS, and give your CI/CD pipeline a real service account instead of a human login.
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Migrating a Stateless Application End to End on VKS (TKGI to VKS Series, Part 18)
Move a stateless service from TKGI to VKS with Velero, then fix the two things that break on VCF 9, Pod Security admission and image pull secrets, before you touch DNS.
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Identity, RBAC and Harbor on VKS (TKGI to VKS Series, Part 15)
How to replace TKGI UAA with vCenter SSO, map old LDAP groups to vSphere Namespace roles, grant developers scoped RBAC, and install Harbor as a Supervisor Service on your first VKS cluster.
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First VKS Cluster on VCF 9, Namespaces, Cluster Classes and Node Pools (TKGI to VKS Series, Part 14)
Standing up the first VKS cluster the dev wave lands on: create the vSphere Namespace, bind resources, pick a Cluster Class and Tanzu Kubernetes release, apply the manifest, size node pools, and verify with kubectl.
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Application Assessment and Migration Waves for TKGI to VKS (TKGI to VKS Series, Part 6)
Assess every TKGI application, pick between a Velero restore and a pipeline redeploy, and sort your workloads into migration waves that reach VKS on VCF 9 without a big-bang cutover.
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Inventorying the TKGI Estate Before a VKS Migration (TKGI to VKS Series, Part 5)
A read only, three pass inventory of a TKGI 1.18 estate, TKGI CLI for clusters, BOSH for the VMs, kubectl for workloads and storage, and why the persistent volumes, not the cluster count, decide your migration schedule.
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About the Author
Dr Pranay Jha
Dr. Pranay Jha is a Cloud and AI Consultant with 18+ years of experience in hybrid cloud, virtualization, and enterprise infrastructure transformation. He specializes in VMware technologies, multi-cloud strategy, and Generative AI solutions. He holds a PhD in Computer Applications with research focused on Cloud and AI, has published multiple research papers, and has been a VMware vExpert since 2016 and a VMUG Community Leader.
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