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TKGM PR-DR SITE ON VCLOUD DIRECTOR ARCHITECURE

 TKGM PR-DR SITE ON VCLOUD DIRECTOR ARCHITECURE 

You build:

  1. vSphere + vCD + NSX-T + CSE on both sites.

  2. You deploy TKGm clusters on primary.

  3. You set up Velero to back up YAMLs and volumes.

  4. You mirror Harbor registry to DR.

  5. You test restoring a cluster on DR site using CSE + Velero.

  6. You prepare DNS (manual or automated) to point to DR when needed.


Primary & DR Site Layer Comparison Table

LayerComponentPrimary SiteDR SiteWhat Happens During DR?Notes / Tools
1️⃣InfrastructurevSphere (ESXi, vCenter)Same setupDR vSphere takes overEnsure hardware compatibility
2️⃣NetworkingNSX-TSame NSX-T setupDR NSX routes trafficReplicate NSX segments, edge configs
3️⃣Cloud ManagementvCloud DirectorvCloud DirectorDR vCD deploys new VMsMust sync templates across sites
4️⃣K8s ProvisioningCSE (TKGM enabled)CSE (same version)DR CSE deploys TKGm clusterSync catalog/templates
5️⃣Kubernetes ClusterTKGm Cluster (Running)TKGm Cluster (Rebuilt)Apps are restored on DR clusterUse Velero / GitOps to restore
6️⃣Persistent Storage (PV)CSI Volumes / DatastoreRestored from backup or replicationApps regain their dataUse Velero+Restic, Zerto, or vSphere Replication
7️⃣Container ImagesHarbor RegistryMirror / Backup HarborDR cluster pulls same imagesEnable Harbor replication between sites
8️⃣K8s Configs / YAMLsGitOps (Flux / ArgoCD) or VeleroSame toolsRe-apply YAMLs in DRUse Git source or Velero backup
9️⃣DNS FailoverDNS entry points to primaryDNS updated to DR IPDNS points to DR cluster ingressUse manual switch or automated failover (Route53, Cloudflare)

🥶 Cold vs 🔥 Hot Standby Table

TypeWhat It MeansProsConsWhen to Use
🧊 Cold StandbyDR site is ready but not running TKGmCheaperSlow failover (10–60 mins)Most common, low-cost DR
🔥 Hot StandbyDR cluster runs live + in syncFast failoverHigh cost, complexityFor mission-critical workloads

🌐 DNS Redirection Table

MethodDescriptionToolsSpeedRecommended When
🛠️ Manual DNS SwitchYou change DNS IP after failoverGoDaddy, Cloudflare, etc.Slow (few minutes)OK for small/low-impact apps
⚙️ Automated FailoverHealth check + switch IP automaticallyRoute53, NS1, F5 GSLBFast (seconds to 1 min)Critical apps needing <1 min downtime


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