Best Self Hosted Alternatives to Red Hat Quay

Harbor is a CNCF Graduated cloud native registry for managing container images and related artifacts with security and governance controls. It extends the OCI/Docker registry model with enterprise features like policy enforcement, vulnerability scanning, and image signing to support secure supply chains.

Key Features

• Stores and manages container images and other cloud native artifacts, including Helm charts
• Role-based access control using projects for multi-tenant repository management
• Policy-based replication between registries for hybrid and multi-cloud deployments
• Built-in vulnerability scanning with policies to block deployment of vulnerable artifacts
• Image signing support and validation for provenance and integrity (including Notary-based workflows)
• Authentication integrations including LDAP/AD and OpenID Connect for SSO
• Audit logs for repository and administrative operations
• REST API with Swagger/OpenAPI interface for automation and integrations

Use Cases

• Run a private, policy-controlled registry for Kubernetes and Docker environments
• Enforce artifact security (scan/sign) as part of CI/CD and release workflows
• Replicate images across regions or datacenters for performance and availability

Limitations and Considerations

• Full feature set and integrations typically require multiple supporting components (scanner, signing, auth provider) and careful operational configuration

Harbor is a strong fit for teams that need a secure, compliant artifact registry with enterprise access control and automation capabilities. It is widely adopted in cloud native environments and integrates well with Kubernetes-centric workflows.

Unregistry is a lightweight OCI image registry designed to move container images directly from your local Docker environment to remote servers without running or relying on an external registry. It pairs with a Docker CLI plugin command, docker pussh, to transfer images over SSH efficiently by sending only missing layers.

Key Features

• Push images directly to a remote Docker host over SSH using a Docker CLI plugin
• Transfers only missing image layers to speed up deployments and reduce bandwidth
• Runs a temporary unregistry container on the target host and cleans up after the push
• Stores images in containerd’s image store; can integrate best with Docker’s containerd image store mode
• Can be run standalone as a simple local registry backed by containerd

Use Cases

• Deploy locally built images straight to production or staging servers without a registry
• Simplify CI/CD pipelines by pushing images directly to deployment targets
• Distribute container images in homelab or restricted networks where registries are undesirable

Limitations and Considerations

• Requires SSH access and permissions to run Docker commands on the remote host
• Best experience requires enabling Docker’s containerd image store; otherwise images may be duplicated and require an extra pull step
• The remote host must be able to obtain the unregistry image (or you must preload it for restricted environments)

Unregistry is a pragmatic alternative to running a full registry when your main goal is simply getting images from one machine to another quickly and securely. It is especially useful for small fleets, direct server deployments, and workflows that prefer SSH-based operations over maintaining additional infrastructure.

Zot is an OCI-native container image and artifact registry that implements the OCI Distribution and Image specifications. It is designed as a single, statically-built binary with optional feature sets (full/minimal) and provides a web UI and CLI for managing images and artifacts. (github.com)

Key Features

• OCI-compliant registry implementing the OCI Distribution and Image specifications (registry APIs compatible with Docker clients).
• Single static binary distribution with full and minimal builds to balance features vs. attack surface. (zotregistry.dev)
• Local filesystem and Amazon S3 storage backend support with deduplication, garbage collection, and configurable commit/gc behavior. (zotregistry.dev)
• Built-in authentication and authorization, image signature support (cosign/notation) and security-focused configuration options. (zotregistry.dev)
• Web-based UI and a command-line client (zli) plus benchmarking tooling (zb); separate React-based UI repository is available. (github.com)
• Features for mirroring, clustering/scale-out deployment, and integration guides for Kubernetes/Helm. (zotregistry.dev)

Use Cases

• Host and serve container images and OCI artifacts for on-premise or cloud-native CI/CD pipelines, supporting Docker-compatible clients.
• Provide a lightweight, standards-compliant registry for edge, embedded, or constrained environments via the minimal binary build.
• Run a scale-out registry with S3-backed storage and clustering for high-availability distribution of artifacts.

Limitations and Considerations

• S3 remote storage support is limited to AWS S3-compatible APIs (configure credentials or IAM roles as required); other cloud-specific backends are not listed as supported in official docs. (zotregistry.dev)

Zot is a focused, standards-first registry implementation intended for production use where OCI compliance, simple deployment (single binary), and storage flexibility matter. It is suitable for both lightweight edge deployments and larger clustered registries when combined with the provided clustering and mirroring features. (github.com)

RepoFlow is a self-hosted package management platform designed to manage private and public repositories in the cloud or on your own servers. It supports multiple package types, enforces upload rules, and emphasizes security and scalability for teams.

Key Features

• Vulnerabilities Scanning: on-demand CVE scanning to assess security risks
• Smart package search: fast discovery across descriptions and READMEs
• Supports major package types: Docker, NPM, PyPI, Maven, NuGet, Helm, RPM, Gems, Go, Cargo, Composer, Debian, Universal
• Keep Your Repositories Clean: strict upload-validation to reject non-packages
• Self hosted: deploy on your own servers for security/compliance
• Built for scale: designed to handle large catalogs with reliable performance
• SSO + LDAP Support: integrated authentication and user management
• Upload Restriction Rules: granular controls on what can be uploaded
• No more Registry indexing: instant package access without slow indexing

Use Cases

• Enterprise artifact hosting: centralize private/public packages with secure access and policy enforcement
• CI/CD integration: support for multiple package types within self-hosted pipelines with governance
• Regulated environments: on-prem deployments with access controls, CVE scanning, and compliance rules

Conclusion

RepoFlow provides a self-hosted, scalable solution for managing software artifacts across multiple ecosystems, combining security, fast search, and flexible deployment to fit enterprise policies.