TrueNAS 27 (Early)

TrueNAS 27 brings many new features and improvements to the TrueNAS experience.

TrueNAS 27 introduces an annual release cadence with simplified version numbering. Instead of fish-themed code names and multi-digit version strings, releases now use straightforward numbers like “27.0”. TrueNAS 27 receives feature packs, security updates, and hotfixes throughout the year, providing more predictable upgrade cycles and extended testing periods for both the engineering team and end users.

WebShare provides browser-based file access without requiring SMB or NFS client mounting on user systems. Users can browse, upload, download, and manage files directly from a web browser, with support for folder creation, filtering, snapshot timeline viewing, shareable links, and hidden file toggling. WebShare is configured through TrueNAS Connect and requires a dataset and at least one local user account with WebShare access enabled.

When TrueSearch is enabled in the WebShare service configuration, all active shares are indexed for fast file searching by filename, content, or file type. Encrypted datasets are excluded from indexing. Passkey authentication options provide flexible access control for WebShare users.

Object storage (S3 API) is available in TrueNAS 27 as a native TrueNAS service, in addition to the containerized third-party app. The TrueNAS Object Interface gives concurrent access to the same data over SMB, NFS, WebShare, and the S3 protocol. Each object storage bucket is a ZFS dataset, so object data gets the same snapshots, quotas, replication, and data integrity as other data, and is managed from the same web interface.

27-RC.1 covers the core S3 API that applications depend on, including multipart uploads, object tagging, bucket and object ACLs, versioning, and immutability. The TrueNAS Object Interface runs on every TrueNAS edition with no capacity limits, including in offline mode for air-gapped environments. Versioning and Object Lock require a TrueNAS Connect Plus license or a TrueNAS Enterprise system.

The TrueNAS Object Interface is an Early Access feature. Try it with your applications and share what works and what doesn’t on the forums. See Configuring S3 Object Storage and the 27-RC.1 feature set blog post.

Amazon S3 is a trademark of Amazon.com, Inc. or its affiliates.

Containers, introduced as an experimental feature in TrueNAS 25.04, are fully supported in TrueNAS 27. Containers provide lightweight, isolated Linux environments that share the host kernel while maintaining their own file system, processes, and network configuration, using fewer system resources than virtual machines while starting quickly and scaling efficiently.

TrueNAS 27 extends container support to Enterprise systems with High Availability (HA) configurations, enabling container failover between controllers. HA container failover requires a static IP configuration.

Users migrating from TrueNAS CORE who previously relied on custom Jails can use containers as a supported migration path. See Containers for configuration details.

TrueNAS 27 introduces stateful SMB HA failover for Enterprise systems with High Availability (HA) configurations. When enabled in the SMB service configuration, TrueNAS maintains SMB session state across controller failover events, allowing SMB clients to recover existing connections without re-authentication after a failover. See Enabling SMB Stateful Failover for configuration details.

TrueNAS 27 adds Spotlight search support for SMB shares, allowing macOS clients to use Spotlight to search file contents directly on TrueNAS SMB shares. Spotlight search requires a TrueNAS Enterprise or TrueNAS Connect Plus license. Spotlight search is enabled in the SMB service configuration. TrueSearch indexes all active SMB shares and does not index encrypted datasets. See Enabling Spotlight Search for configuration details.

Storage Tiering is a TrueNAS Enterprise feature that lets administrators move data between the performance (flash) and capacity (HDD) tiers of a fusion pool without disrupting clients. Datasets migrate transparently between tiers, and share access paths stay the same.

TrueNAS 27 integrates OpenZFS 2.4, which introduces new capabilities including hybrid pool support for combining flash and HDD storage, physical block rewriting, and dynamic gang header improvements. It also adds default user, group, and project quotas, and the ability to limit scrubs to a set time window. See OpenZFS Feature Flags for details on newly added feature flags.

TrueNAS 27 ships with Linux Kernel 6.18, enabling support for new hardware and receiving long-term maintenance and security updates from the upstream kernel project.

TrueNAS 27 removes the deprecated REST API and modernizes the JSON-RPC 2.0 WebSocket API with improved authentication methods, including SCRAM-SHA-512 mutual authentication for API keys.

See API Changes for migration guidance.