Title: HarborCache – Object Cache with Redis Author: shahidirfan100 Published: October 20, 2026 Last modified: October 21, 2026 --- Search plugins ![](https://ps.w.org/harborcache-object-cache-with-redis/assets/banner-772x250.png? rev=3755924) ![](https://ps.w.org/harborcache-object-cache-with-redis/assets/icon.svg?rev=3755924) # HarborCache – Object Cache with Redis By [shahidirfan100](https://profiles.wordpress.org/shahidirfan100/) [Download](https://downloads.wordpress.org/plugin/harborcache-object-cache-with-redis.1.2.5.zip) * [Details](https://wordpress.org/plugins/harborcache-object-cache-with-redis/#description) * [Reviews](https://wordpress.org/plugins/harborcache-object-cache-with-redis/#reviews) * [Installation](https://wordpress.org/plugins/harborcache-object-cache-with-redis/#installation) * [Development](https://wordpress.org/plugins/harborcache-object-cache-with-redis/#developers) [Support](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/) ## Description HarborCache provides persistent Redis object caching with a dashboard, local analytics, connection settings and scoped cache controls. It was developed around the day-to- day needs of the author’s websites, with its own administration and cache-management workflow. It requires a separately operated Redis server. No account, subscription or license key is required. Request analytics stay in your configured Redis namespace. External tracing is disabled by default. See docs/FEATURES.md for implemented behavior, verified configurations and deployment acceptance gates. Features include persistent caching through Predis, PhpRedis, Relay or Credis; multisite group scopes; bounded TTLs; atomic namespace invalidation; bulk cache operations; typed values; optional serialization and compression; optional split-alloptions storage; request key prefetching; local sampled analytics; WP-CLI; protected administration forms; Site Health; Query Monitor; and Debug Bar support. Advanced additions include bounded background reclamation, exact integer counters, safe-read retries/backoff, replica/Sentinel/cluster read routing, logging/tracing adapters, custom cache/connector factories, analytics retention/count/flush-persistence controls and shared-server capacity reporting. See docs/ADVANCED.md and the feature ledger for native-extension acceptance gates and API differences. The dashboard includes Overview, Analytics, Connection, Cache Groups, Tools and Diagnostics. Configuration is saved to a guarded PHP file in wp-content. Configuration constants take precedence. Passwords and cached values are excluded from diagnostic exports. HarborCache connects to the Redis endpoint you configure. It does not contact the original plugin vendor. Optional tracing must be explicitly configured and uses your host application’s New Relic or OpenTelemetry integration and destination. Plugin-provided spans contain command names, timings and bounded datastore metadata; they omit cached keys, values, credentials and endpoint details. Configure retention and privacy in your provider or collector. No tracing SDK, remote account or external destination is enabled by default. Redis is a registered trademark of Redis Ltd. No affiliation or endorsement is implied. ## Screenshots [⌊Overview: cache status, request metrics and lifecycle controls.⌉⌊Overview: cache status, request metrics and lifecycle controls.⌉[ Overview: cache status, request metrics and lifecycle controls. [⌊Analytics: local sampled request history.⌉⌊Analytics: local sampled request history .⌉[ Analytics: local sampled request history. [⌊Connection and cache configuration.⌉⌊Connection and cache configuration.⌉[ Connection and cache configuration. [⌊Cache groups and scoped invalidation.⌉⌊Cache groups and scoped invalidation.⌉[ Cache groups and scoped invalidation. [⌊Tools and server observability.⌉⌊Tools and server observability.⌉[ Tools and server observability. [⌊Redacted diagnostics.⌉⌊Redacted diagnostics.⌉[ Redacted diagnostics. [⌊WordPress dashboard charts and statistics widget.⌉⌊WordPress dashboard charts and statistics widget.⌉[ WordPress dashboard charts and statistics widget. ## Installation 1. Install HarborCache from Plugins > Add New, or upload the installable ZIP, then activate it. 2. Open Settings > HarborCache, or Network Admin > Settings > HarborCache. 3. Configure your Redis host, port, database and credentials on the Connection tab. 4. Save configuration, then choose Enable Object Cache on the Overview tab. 5. Verify Connected status and Site Health. Test on staging before production. Disable any other object-cache plugin first. HarborCache refuses to overwrite another plugin’s object-cache.php. Removing the drop-in does not flush unrelated Redis data. For advanced connection configuration, TLS and migration guidance, see docs/CONFIGURATION. md. ## FAQ ### Does this include a Redis server? No. Your host must provide Redis or you must operate a Redis server. ### Is a license key required? No. All included local features are available without a license key. ### What is HarborCache based on? HarborCache’s cache engine is a modified GPLv3 fork of Redis Object Cache 3.0.0 by Till Krüss and contributors. Its additional dashboard, configuration and cache- management work is by Shahid Irfan. Experience using existing Redis caching plugins helped shape the initial requirements. The upstream license and source attribution are retained; see docs/SOURCE.md. ### Does flush delete other applications’ data? HarborCache’s flush changes its namespace tokens. Old entries expire within the maximum TTL. It does not call FLUSHDB or FLUSHALL. ### Can I reuse another plugin’s cache data? Configure a distinct prefix and retire the previous drop-in through its owning plugin. Cache data formats and invalidation rules can differ; do not assume the stored entries are compatible. ## Reviews ![](https://secure.gravatar.com/avatar/894d1b6c075c81dc8826e1f592397ef9e4852d5c4838c12cd9d11ad60d98bc6c? s=60&d=retro&r=g) ### 󠀁[AI SLOP](https://wordpress.org/support/topic/ai-slop-2/)󠁿 [Till Krüss](https://profiles.wordpress.org/tillkruess/) October 20, 2026 1 reply Why do you mention OCP if this is a fork of Redis Object Cache? Why copy Redis Object Cache, instead of contributing on GitHub? [ Read all 1 review ](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/reviews/) ## Contributors & Developers “HarborCache – Object Cache with Redis” is open source software. The following people have contributed to this plugin. Contributors * [ shahidirfan100 ](https://profiles.wordpress.org/shahidirfan100/) [Translate “HarborCache – Object Cache with Redis” into your language.](https://translate.wordpress.org/projects/wp-plugins/harborcache-object-cache-with-redis) ### Interested in development? [Browse the code](https://plugins.trac.wordpress.org/browser/harborcache-object-cache-with-redis/), check out the [SVN repository](https://plugins.svn.wordpress.org/harborcache-object-cache-with-redis/), or subscribe to the [development log](https://plugins.trac.wordpress.org/log/harborcache-object-cache-with-redis/) by [RSS](https://plugins.trac.wordpress.org/log/harborcache-object-cache-with-redis/?limit=100&mode=stop_on_copy&format=rss). ## Changelog #### 1.2.5 * Clarify the Redis Object Cache fork attribution and describe HarborCache’s own features directly. * Remove unnecessary product comparisons from current descriptions and clarify cache migration guidance. * Preserve cache behavior, compatibility hooks, dashboard styling and media assets. #### 1.2.4 * Resolve the plugin directory from its actual installation and install a verified drop-in with that path. * Remove legacy directory guesses from Predis and preserve recovery when a plugin folder moves. * Escape diagnostic and error output at rendering time. * Default PHP 7.4 PhpRedis TLS connections to verified TLS 1.2 to avoid a known TLS 1.3 stream hang; preserve explicit TLS policies. * Exclude development reports and unused vendor documentation from the install ZIP while retaining source and licenses. #### 1.2.3 * Recover verified backups when an interrupted update leaves a partial drop-in at the destination. * Remove incomplete drop-in files after failed first installs or failed rollback copies so WordPress can start without persistent caching. * Preserve foreign cache drop-ins and show a specific recovery message when HarborCache cannot safely replace a file. * Add automated coverage for interrupted writes, backup recovery and failed filesystem operations. #### 1.2.2 * Give HarborCache-owned plugin metadata and drop-in paths distinct HARBORCACHE- prefixed constants. * Preserve WP_REDIS_* connection configuration as an input compatibility layer without claiming Redis Cache plugin identity. * Resolve the drop-in path from HarborCache’s own installation directory and update the comparison harness to use the correct engine constants. #### 1.2.1 * Scope chart styles and scripts to HarborCache’s admin page and visible dashboard widget. * Sanitize request paths used to build prefetch identifiers. * Remove unused legacy AJAX handlers and their unsanitized nonce path. * Namespace the metrics cleanup cron event and migrate the earlier HarborCache event. * Keep the cache API, Redis key format and saved connection settings compatible. #### 1.2.0 * Reduce temporary allocations in the repeated cache-key layout check without changing key or namespace semantics. * Format dashboard counters for quick reading and increase dashboard, chart, settings and widget text sizes. * Add fresh-worker replacement, ignored-group storage and group-flush scaling coverage. * Compare group invalidation and cache workloads against Redis Object Cache 3.0.0 and HarborCache 1.1.5 in Linux CI. #### 1.1.5 * Restore the complete HarborCache – Object Cache with Redis name used by the installed plugin. * Show the complete product name in the HarborCache settings page title and describe its purpose below the logo. * Refresh the plugin screenshots without a visible version footer. #### 1.1.4 * Standardize the WordPress plugin identity as HarborCache across plugin listings and the dashboard. * Match the translation domain and installation folder to the WordPress.org submission slug. * Preserve the legacy HarborCache installation path for existing drop-ins and MU- loader setups. #### 1.1.3 * Reduce repeated wildcard-group matching and inactive command instrumentation overhead. * Preserve late group registration, optional tracing and existing namespace formats. * Fix native counter failure replies and bypass Relay local caching for forced reads. * Add Linux/MySQL, native codecs, ACL/TLS/socket, concurrency, WooCommerce and multisite acceptance tests. * Publish reproducible CPU, memory and latency comparisons with Redis Object Cache 3.0.0. #### 1.1.2 * Added verified drop-in staging, update locking, backup restoration and interrupted- update recovery. * Fixed per-option TTL coordination, missing-field recovery and primary pinning for multi-key writes. * Reset cached topology discovery on safe-read reconnects without discarding request write history. * Added cleanup leases, abandoned-job recovery, bounded deletion batches and on- demand maintenance scheduling. * Fixed dashboard notice placement, settings section headings, readable typography and matching 44px controls. * Kept chart labels readable across widths; added an accessible data table, sampling rate and last sample time. * Separated runtime and Redis-store hit counters, fixed cached false/null bulk- hit accounting, and rejected malformed telemetry. * Explained unavailable extensions and reduced repeated admin file checks and unrelated- page scripts. #### 1.1.1 * Reduced runtime-hit, derived-key and disabled-instrumentation overhead with bounded request caches. * Preserved namespace formats and invalidation; added memoization boundary checks. * Fixed native pipeline namespace/filter isolation and unintended TLS for TCP cluster connections. * Added native PhpRedis/Relay primary-replica and Sentinel discovery connectors. * Tested real PhpRedis standalone, cluster, replica and Sentinel behavior, and real OpenTelemetry OTLP HTTP export. * Published same-workload Redis Cache 3.0.0 comparisons and explicit remaining deployment gates. #### 1.1.0 * Removed plugin REST routes; management and exports use protected WordPress admin actions. * Fixed the obsolete drop-in update notice/action and added safe owned-drop-in refresh. * Added time-window analytics, percentiles, interval summaries and CSV export. * Added on-demand group memory/counts, node latency, operational health and Relay adaptive diagnostics. * Added Relay option strings, explicit failure modes, optional query recycling and cooperative cleanup budgets. * Cached configuration per request and added native New Relic datastore instrumentation. * Added CLI analytics, digest, aggregate, watch, health and latency commands; included an MU loader and Composer package metadata. * Standardized connected status and Connect/Disconnect button dimensions. #### 1.0.2 * Enlarged dashboard widget text and responsive chart axes. * Added protected Disconnect and Connect controls beside the widget and plugin connection status. * Disconnect disables this installation’s persistent cache while retaining connection settings and leaving Redis running. * Reconnecting rotates only this installation’s cache namespace to avoid reusing entries made stale while disconnected. Old entries expire under the configured maximum TTL. #### 1.0.1 * Added teal area charts for Time, Bytes, Ratio and Calls, plus latest/average/ peak values in the home dashboard widget and Overview. * Removed the account/license sentence from the dashboard footer. #### 1.0.0 * Added a dashboard statistics widget with request metrics and a bounded recent- sample summary; no background polling. * Limited dashboard analytics transfer to the latest 100 samples and connection discovery to Redis server information. * Hardened configuration, namespace failures, atomic drop-in replacement, corrupt payload reads, exact integer counters and concurrent split-alloptions updates. * Fixed Credis loading/commands and Predis cluster routing; verified single-server and three-node cluster operation. * Added background cleanup, selectable flush strategies, safe-read retries, primary/ replica routing, Sentinel promotion tests and Relay native-option adapters. * Added analytics persistence/count controls, strict ownership, shared capacity reporting, extension factories and redacted logging/tracing. * Renamed the initial developer build based on Redis Object Cache 3.0.0. * Original dashboard, scoped invalidation, typed cache values, configuration, diagnostics and REST controls. ## Meta * Version **1.2.5** * Last updated **3 hours ago** * Active installations **Fewer than 10** * WordPress version ** 6.6 or higher ** * Tested up to **7.1.3** * PHP version ** 7.4 or higher ** * Tags * [caching](https://wordpress.org/plugins/tags/caching/)[diagnostics](https://wordpress.org/plugins/tags/diagnostics/) [object cache](https://wordpress.org/plugins/tags/object-cache/)[performance](https://wordpress.org/plugins/tags/performance/) [redis](https://wordpress.org/plugins/tags/redis/) * [Advanced View](https://wordpress.org/plugins/harborcache-object-cache-with-redis/advanced/) ## Ratings 1 out of 5 stars. * [ 0 5-star reviews ](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/reviews/?filter=5) * [ 0 4-star reviews ](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/reviews/?filter=4) * [ 0 3-star reviews ](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/reviews/?filter=3) * [ 0 2-star reviews ](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/reviews/?filter=2) * [ 1 1-star review ](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/reviews/?filter=1) [Your review](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/reviews/#new-post) [See all reviews](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/reviews/) ## Contributors * [ shahidirfan100 ](https://profiles.wordpress.org/shahidirfan100/) ## Support Got something to say? Need help? [View support forum](https://wordpress.org/support/plugin/harborcache-object-cache-with-redis/)