Redis cluster support and configuration

ℹ️ Support
2

Maybe I found the beginning of a response by exploring files on the Nextcloud Server Github page.

I found there a commit called ‘redis cluster support added’, where there are modifications in the config.sample.php file talking about Redis clustering.

There is this section in that file :

/**
 * Connection details for a Redis Cluster
 *
 * Only for use with Redis Clustering, for Sentinel-based setups use the single
 * server configuration above, and perform HA on the hostname.
 *
 * Redis Cluster support requires the php module phpredis in version 3.0.0 or higher.
 *
 * Available failover modes:
 *  - \RedisCluster::FAILOVER_NONE - only send commands to master nodes (default)
 *  - \RedisCluster::FAILOVER_ERROR - failover to slaves for read commands if master is unavailable
 *  - \RedisCluster::FAILOVER_DISTRIBUTE - randomly distribute read commands across master and slaves
 */
'redis.cluster' => [
	'seeds' => [ // provide some/all of the cluster servers to bootstrap discovery, port required
		'localhost:7000',
		'localhost:7001'
	],
	'timeout' => 0.0,
	'read_timeout' => 0.0,
	'failover_mode' => \RedisCluster::FAILOVER_DISTRIBUTE
],

I will rebuild my Redis clustering setup with the new clustering capabilities of Redis 3.0 (which seems not use redis-sentinel to promote masters), and then install a nextcloud server using these settings to check if all is working, then I’ll let you know the results.

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