Trouble with Integration Amazon ElastiCache: ERR SELECT is not allowed in cluster mode

Question

Hi, I'm currently integrating Amazon ElastiCache (Redis cache) into my Laravel application using a serverless cache configuration. In Laravel, I'm using the Predis package. Everything runs smoothly on my local machine with local Redis. However, when attempting to add Amazon ElastiCache as a cache driver, I encounter the following error: SELECT failed: ERR SELECT is not allowed in cluster mode [tls://mycachename.cache.amazonaws.com:6379]. I've tried various solutions, but none seem to work. Can someone assist me in resolving this issue?

Answer

Amazon ElastiCache Serverless only supports [Redis Cluster Mode Enabled](https://redis.io/docs/management/scaling/) (CME). When running in cluster mode, Redis doesn't support the SELECT command, which your Predis client is trying to use. This probably happens because Predis assumes Redis is running in non-clustered mode (Cluster Mode Disabled or CMD). Please see the configuration guide for Predis and try to configure Predis to use Redis in Cluster Mode - [see the docs here](https://redis.io/docs/management/scaling/) and [this StackOverflow question](https://stackoverflow.com/questions/41091103/laravel-predis-redis-cluster-moved-no-connection-to-127-0-0-16379)

Trouble with Integration Amazon ElastiCache: ERR SELECT is not allowed in cluster mode

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