Tag: Migration
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Decommissioning TKGI and Ops Manager, and What Comes Next (TKGI to OpenShift Series, Part 26)
A ten step teardown runbook for retiring a TKGI estate after the OpenShift cutover, covering cluster deletion, the TKGI tile, Ops Manager, BOSH, and the NSX-T and vSphere objects that survive every documented step.
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Production Cutover, Traffic Shift, Validation and Rollback (TKGI to OpenShift Series, Part 23)
Moving live production traffic off TKGI onto OpenShift without a visible outage, using weighted Routes as the only lever on the night. Includes a five step traffic ladder, real preflight commands, and a cutover I reversed at 03:40.
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Pilot Migration, One Non-Prod Cluster End to End (TKGI to OpenShift Series, Part 22)
A pilot that passes proves nothing unless the app team runs it. Here is how I moved one non production TKGI cluster onto OpenShift 4 end to end, with the exit criteria scorecard, the real timings and the rollback.
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Secrets, Config and CI/CD Pipeline Migration to OpenShift (TKGI to OpenShift Series, Part 21)
Credentials and build pipelines are the last things to follow your workloads off TKGI, and the obvious move, restoring secrets from a Velero backup, is the wrong one. Here is how to rotate at the platform boundary, wire External Secrets, and rebuild Jenkins jobs as OpenShift Pipelines.
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Ingress to Routes, Load Balancing and DNS Cutover (TKGI to OpenShift Series, Part 20)
Moving wave1-web traffic off NSX-T and onto OpenShift Routes, with a weighted load balancer cutover, a TTL schedule that survives stale resolvers, and the 504 that only appears after you switch. Part 20 of the TKGI to OpenShift Series.
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Migrating a Stateful Application with Persistent Volumes (TKGI to OpenShift Series, Part 19)
Moving a PostgreSQL StatefulSet and 61 GiB of live data from TKGI to OpenShift with Velero and OADP, including the storage class mapping, the pre-backup hook and the admission failure that costs most teams an afternoon.
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Migrating a Stateless Application End to End (TKGI to OpenShift Series, Part 18)
Moving your first stateless namespace off TKGI is less about Velero than about what OpenShift admission does to the pods when they land. Here is the whole loop, including a restore that reported success while nothing started.
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Migration Toolchain, Velero on TKGI and OADP on OpenShift (TKGI to OpenShift Series, Part 17)
Velero on the TKGI side writes to object storage and OADP restores on OpenShift. Here is the install, the version pin that keeps both ends compatible, and the read only backup location that stops OpenShift deleting your source backups.
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OpenShift OAuth, LDAP Group Sync and Registry Setup (TKGI to OpenShift Series, Part 15)
Login proves identity, and group membership does not arrive with it. Here is how to wire OpenShift OAuth to the directory behind TKGI, sync groups on a schedule, bind roles, and decide whether the internal image registry or Harbor serves your migration waves.
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Installing OpenShift 4 on vSphere, IPI and UPI Compared (TKGI to OpenShift Series, Part 12)
IPI or UPI for the first OpenShift cluster beside your TKGI estate. A working install-config for vSphere, the three DNS records that decide the install, and the bootstrap failure that costs most teams two attempts.
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Target Reference Architecture, OpenShift 4 on vSphere (TKGI to OpenShift Series, Part 11)
A concrete OpenShift 4 target for our reference TKGI estate: two clusters instead of three, three vSphere failure domains declared on day zero, and a mapping table from every TKGI component to whatever replaces it.
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Identity, RBAC and Multi-Tenancy, TKGI Plans to OpenShift Projects (TKGI to OpenShift Series, Part 10)
TKGI put tenancy at the cluster boundary and OpenShift puts it at the Project. This part maps UAA scopes, LDAP groups and Plans onto OpenShift RBAC, project templates and ClusterResourceQuota, including the group sync step that silently breaks every binding if you skip it.
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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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