Add the following lines to your virtual host configuration file (before existing configuration):
To keep a HARP Nextcloud instance operating smoothly, deploy monitoring tools like paired with Grafana dashboards . Focus on tracking these critical operational thresholds: Target Metric Warning Threshold Operational Remedy Redis redis_connected_clients Exceeding 85% capacity Scale up Redis RAM or implement sharding Galera wsrep_cluster_size Value drops below 3 Investigate failed database node connectivity PHP-FPM active_processes Consistently hitting max limits Increase pm.max_children allocations per node Storage s3_bucket_latency Response times > 150ms Optimize underlying object storage disk arrays Conclusion
The entry point of a HARP architecture is the load balancing layer. Tools like or NGINX sit in front of your web servers, receiving all incoming HTTPS traffic.
If object storage is not feasible, a clustered file system like CephFS or a highly available NFS appliance (backed by DRBD) must be mounted across all web nodes at /var/www/nextcloud/data . 3. Step-by-Step HARP Nextcloud Deployment Strategy harp nextcloud
HaRP addresses these limitations head-on. It enables direct communication between clients and ExApps, bypassing the Nextcloud instance entirely to improve performance and reduce deployment complexity.
For organizations currently using the Docker Socket Proxy, planning a migration to HaRP will future-proof your infrastructure and unlock new capabilities.
'oc_harpinstance', 'passwordsalt' => 'RandomSaltGeneratedBySystem', 'secret' => 'RandomSecretGeneratedBySystem', 'trusted_domains' => array ( 0 => '://example.com', ), // Database Configuration pointing to the Cluster Load Balancer 'dbtype' => 'mysql', 'version' => '28.0.0', 'dbname' => 'nextcloud_harp', 'dbhost' => 'db-cluster-lb.example.internal:3306', 'dbuser' => 'harp_user', 'dbpassword' => 'YourSecurePassword', 'dbtableprefix' => 'oc_', // High Availability Distributed Redis Configuration 'memcache.local' => '\OC\Memcache\APCu', 'memcache.distributed' => '\OC\Memcache\Redis', 'memcache.locking' => '\OC\Memcache\Redis', 'redis.cluster' => array( 'seeds' => array( 'redis-node1.example.internal:6379', 'redis-node2.example.internal:6379', 'redis-node3.example.internal:6379', ), 'timeout' => 0.0, 'read_timeout' => 0.0, 'failover_mode' => \RedisCluster::FAILOVER_DISTRIBUTE, ), // Primary S3 Object Storage Config 'objectstore' => array( 'class' => '\\OC\\Files\\ObjectStore\\S3', 'arguments' => array( 'bucket' => 'nextcloud-harp-storage', 'autocreate' => false, 'key' => 'YOUR_S3_ACCESS_KEY', 'secret' => 'YOUR_S3_SECRET_KEY', 'hostname' => 's3.example.internal', 'port' => 9000, 'use_ssl' => true, 'region' => 'us-east-1', 'use_path_style'=> true, ), ), 'installed' => true, ); Use code with caution. Step 5: Replicate the Web Nodes Add the following lines to your virtual host
It provides built-in brute-force protection and basic authentication, securing exposed interfaces.
It utilizes Fast Reverse Proxy (FRP) to create secure tunnels between the HaRP container and ExApps. This means ExApp containers don't need to expose ports to the host, simplifying networking and providing NAT traversal.
HaRP is a specialized reverse proxy designed to simplify how Nextcloud communicates with its microservices (ExApps) If object storage is not feasible, a clustered
As Nextcloud moves toward version 35, the transition from DSP to HaRP is critical for administrators and developers. By providing a future-proof path for External Apps, HaRP ensures that Nextcloud remains a scalable, low-latency platform capable of supporting the next generation of real-time collaboration tools. Adapting ExApps to HaRP - Nextcloud Documentation
Modern cloud collaboration platforms are increasingly moving toward microservices to handle resource-intensive tasks like AI and real-time document editing. Nextcloud’s framework allows developers to build "External Apps" (ExApps) in any language. However, traditional proxy methods often bottlenecked performance and lacked support for real-time protocols. This paper explores HaRP , the recommended proxy for Nextcloud 32+, which optimizes communication by bypassing the standard PHP stack and providing secure tunneling via FRP (Fast Reverse Proxy). 1. Introduction