Redhat Openshift at CubenSquare

Currently working with 4 enterprise clients on #RedHatOpenShift deployments — both On-Prem and Cloud with Platform Plus licensing.

From vCPU-based subscription calculations to deep troubleshooting in production-grade environments, it’s been full-stack platform engineering in action.

With OpenShift 4.19, we’re seeing stricter operator reconciliation, enhanced networking behavior, and major improvements in OpenShift Data Foundation (ODF).

🔎 Real-world challenges we resolved:

DNS & Installation
• Bootstrap node failing due to DHCP mismatch
• dns-default config reconciling unexpected port values
• Node-level DNS working but Pod-level failing
• HAProxy backend misconfiguration affecting API

Storage (ODF)
• StorageCluster stuck in Progressing despite CSV = Succeeded
• Replica/disk miscalculation causing Pending PVs
• Operator reconciliation required after subscription changes

Migration – Migration Toolkit for Virtualization
• ImageConversion failures due to DNS
• DiskTransferV2V stalled
• Warm migration PVC behavior clarification
• MAC / UUID duplication causing VM boot loops

Monitoring & Grafana
• Operator vs Helm deployment decisions
• Missing CRDs
• Prometheus bearer token extraction

LDAP Integration
• OU mismatch
• sAMAccountName vs uid confusion
• CLI login failing while console worked