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Home / Technical Notes / Technology
DevOpsSecurityKubernetes

NebulaCR: Enterprise OCI Registry With Observability and Compliance

Rust registry stack, zero-trust OIDC, SCIM, Prometheus metrics, and Kubernetes-native Helm deployment

April 12, 2026Technology1 min read

NebulaCR (github.com/bwalia/nebulacr) is a Rust Cargo workspace: nebula-registry (OCI API, :5000), nebula-auth (OIDC + JWT, :5001), nebula-common, nebula-controller (CRDs), nebula-mirror (pull-through), nebula-resilience, and nebula-replication. Build with cargo build --workspace --release. Official site: nebulacr.org. Full write-up: documentation blog.

Diagrams (from README / Cargo layout)

NebulaCR Cargo workspace crates

NebulaCR architecture stack

NebulaCR ingress, ports, metrics

NebulaCR zero-trust authentication flow

NebulaCR CRDs and observability

Highlights

  • OCI Distribution API v2, Docker and Podman compatible
  • Zero-trust OIDC for CI (GitHub Actions, GitLab) and interactive SSO
  • Prometheus metrics (e.g. nebulacr_http_requests_total), structured logs, OpenTelemetry tracing
  • Pull-through cache for Docker Hub, GHCR, GCR, Quay, registry.k8s.io
  • Helm OCI chart (ghcr.io/bwalia/charts), HPA, ingress TLS, ServiceMonitor
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