Foundation

Longhorn

DCDR

Distributed block storage — the default StorageClass for every stateful workload in the platform.

Quick facts

Role
PersistentVolume provisioner
Backed by
Local disks on each RKE2 node
Used by
Vault, Kafka, Postgres, Redis, MinIO-on-cluster (where applicable), AWX

What it is

Longhorn provides the default storage class on each cluster and backs every StatefulSet PVC. Replication is handled inside the cluster — DC/DR durability of application data rides on Kafka MirrorMaker 2 and the redis-applier WAL, not on cross-cluster volume replication.

Architecture

Add diagrams or topology notes here — how this component sits relative to DC/DR, what replicates, and what speaks to it. Mermaid blocks render as plain text today; embed images under /assets/ when needed.

Configuration

Add chart values overrides, important env vars, OIDC client config, secret references. Link to the source files in infra/gitops-rke2 rather than copying YAML wholesale — the repo is the source of truth.

Operations

Add runbook notes: backup, restore, common troubleshooting, dashboards, on-call cheatsheet entries.

Failover

Add DC/DR cutover/cutback notes: edge HAProxy backend name, healthcheck path, measured cutover/cutback times, smoke-test commands.

References