How to set up Amazon ElastiCache (Redis) Serverless

[mdobydullah]

Hello Artisans,

I want to integrate ElastiCache Serverless Redis. I've updated the Redis configurations and it works fine.

I'm facing an issue with the Horizon queue:

Predis\Response\ServerException CROSSSLOT Keys in request don't hash to the same slot
/var/www/html/vendor/predis/predis/src/Client.php 370  

Sometimes, I'm experiencing these issues too:

Predis\Connection\ConnectionException Error while reading line from the server. 
[tcp://****.serverless.use2.cache.amazonaws.com:6379]
/var/www/html/vendor/predis/predis/src/Connection/AbstractConnection.php 155  

Illuminate\View\ViewException Error while reading line from the server.
[tcp://***.serverless.use2.cache.amazonaws.com:6379] (View:
/var/www/html/resources/views/frontend/errors/500.blade.php)
/var/www/html/vendor/predis/predis/src/Connection/AbstractConnection.php 155

The config

config/database.php

'redis' => [
    'client' => env('REDIS_CLIENT', 'predis'),

    'options' => [
        'cluster' => env('REDIS_CLUSTER', 'redis'),
        'prefix' => env('REDIS_PREFIX', Str::slug(env('APP_NAME', 'laravel'), '_').'_database_'),
    ],
    
    'clusters' => [
        'default' => [
            [
                'scheme' => env('REDIS_SCHEME', 'tcp'),
                'host' => env('REDIS_HOST', '127.0.0.1'),
                'password' => env('REDIS_PASSWORD', null),
                'port' => env('REDIS_PORT', 6379),
                'database' => 0,
            ],
        ],
        'cache' => [
            [
                'scheme' => env('REDIS_SCHEME', 'tcp'),
                'host' => env('REDIS_HOST', '127.0.0.1'),
                'password' => env('REDIS_PASSWORD', null),
                'port' => env('REDIS_PORT', 6379),
                'database' => 0,
            ],
        ],
    ],
],

.env

REDIS_SCHEME=tls
REDIS_HOST=*****.serverless.use2.cache.amazonaws.com
REDIS_PORT=6379

Please help me sort out the issues. Thanks in advance.

[yourdevDex]

Want to share, I tried this with scheme it connects when connect to redis cli with --tls. But still I encounter the error

Error while reading line from the server.
[tcp://***.serverless.use2.cache.amazonaws.com:6379]

'default' => [
            'url' => env('REDIS_URL'),
            'host' => env('REDIS_HOST', '127.0.0.1'),
            'password' => env('REDIS_PASSWORD', null),
            'port' => env('REDIS_PORT', '6379'),
            'database' => env('REDIS_DB', '0'),
            'scheme' => 'tls',
        ],

[yourdevDex]

Hello Artisans,

I want to integrate ElastiCache Serverless Redis. I've updated the Redis configurations and it works fine.

I'm facing an issue with the Horizon queue:

Predis\Response\ServerException CROSSSLOT Keys in request don't hash to the same slot
/var/www/html/vendor/predis/predis/src/Client.php 370  

Sometimes, I'm experiencing these issues too:

Predis\Connection\ConnectionException Error while reading line from the server. 
[tcp://****.serverless.use2.cache.amazonaws.com:6379]
/var/www/html/vendor/predis/predis/src/Connection/AbstractConnection.php 155  

Illuminate\View\ViewException Error while reading line from the server.
[tcp://***.serverless.use2.cache.amazonaws.com:6379] (View:
/var/www/html/resources/views/frontend/errors/500.blade.php)
/var/www/html/vendor/predis/predis/src/Connection/AbstractConnection.php 155

The config

config/database.php

'redis' => [
    'client' => env('REDIS_CLIENT', 'predis'),

    'options' => [
        'cluster' => env('REDIS_CLUSTER', 'redis'),
        'prefix' => env('REDIS_PREFIX', Str::slug(env('APP_NAME', 'laravel'), '_').'_database_'),
    ],
    
    'clusters' => [
        'default' => [
            [
                'scheme' => env('REDIS_SCHEME', 'tcp'),
                'host' => env('REDIS_HOST', '127.0.0.1'),
                'password' => env('REDIS_PASSWORD', null),
                'port' => env('REDIS_PORT', 6379),
                'database' => 0,
            ],
        ],
        'cache' => [
            [
                'scheme' => env('REDIS_SCHEME', 'tcp'),
                'host' => env('REDIS_HOST', '127.0.0.1'),
                'password' => env('REDIS_PASSWORD', null),
                'port' => env('REDIS_PORT', 6379),
                'database' => 0,
            ],
        ],
    ],
],

.env

REDIS_SCHEME=tls
REDIS_HOST=*****.serverless.use2.cache.amazonaws.com
REDIS_PORT=6379

Please help me sort out the issues. Thanks in advance.

Need to UP this or do you have already a solution?

[mdobydullah]

I've not found a solution yet.

[francirrenio]

Here's the translation of your message to English for posting as a comment on GitHub:

---

Here it's connecting normally using the method below:

$this->redis = new Predis\Client("tls://url.serverless.use1.cache.amazonaws.com:6379");

In ElastiCache, it does not select the database. I'm using it without a password because the ElastiCache is in a private subnet and with access control by security group. If you use the EXISTS command, you will have to switch to CF.EXISTS, and the KEYS command for SCAN.

private function getKeys($pattern){
    $timeout = 5;
    $startTime = microtime(true);
    $cursor = 0;
    $keys = [];
    do {
        $result = $this->redis->scan($cursor, 'match', $pattern, 'count', 100);
        $cursor = $result[0];
        $keys = array_merge($keys, $result[1]);

        // Checks if the timeout has been reached
        if (microtime(true) - $startTime > $timeout) {
            break;
        }
    } while ($cursor != 0);

    return $keys;
}

---

Feel free to adjust any technical terms if needed to better fit the context of your GitHub comment.

[04116]

check this one phpredis/phpredis#2083 (comment)

[evernest-com-au]

Adding tls:// to the front of the REDIS_HOST worked for me. No need for the scheme in the config.

Eg: Before: REDIS_HOST=host.serverless.use2.cache.amazonaws.com after REDIS_HOST=tls://host.serverless.use2.cache.amazonaws.com

[MateusBMP]

It's worked for me with Laravel 11 and Redis OOS Caches engine 7.1 and solves the error "Error while reading line from the server". The error "CROSSSLOT Keys in request don't hash to the same slot" persists.

[markimpmc]

Did you manage to resolve the error "CROSSSLOT Keys in request don't hash to the same slot"?

I'm having the same error here trying to configure Laravel with Amazon Valkey.

[Orrison]

Does anyone else here have luck getting it all to work with Amazon ElastiCache (Redis) Serverless?

I have gotten it to work with the following configuration:

'redis' => [
        'client' => env('REDIS_CLIENT', 'phpredis'),

        'options' => [
            'cluster' => env('REDIS_CLUSTER', 'redis'),
            /** @phpstan-ignore-next-line */
            'prefix' => env('REDIS_PREFIX', Str::slug(env('APP_NAME', 'laravel'), '_') . '_database_'),
        ],

        'default' => [
            'scheme' => env('REDIS_SCHEME', 'tcp'),
            'host' => env('REDIS_HOST', '127.0.0.1'),
            'username' => env('REDIS_USERNAME'),
            'password' => env('REDIS_PASSWORD'),
            'port' => env('REDIS_PORT', '6379'),
            'database' => env('REDIS_DB', '0'),
        ],

        'cache' => [
            'scheme' => env('REDIS_SCHEME', 'tcp'),
            'url' => env('REDIS_URL'),
            'host' => env('REDIS_HOST', '127.0.0.1'),
            'username' => env('REDIS_USERNAME'),
            'password' => env('REDIS_PASSWORD'),
            'port' => env('REDIS_PORT', '6379'),
            'database' => env('REDIS_CACHE_DB', '1'),
        ],
    ],

I am using phpredis and have it working if a treat it like a single node.

It fails to connect and work if I treat it like a cluster by putting the default and cache items under clusters with an error Error processing response from Redis node!

So it has worked fine if I don't treat it like a cluster. But something doesn't feel right about that.
Occasionally (like 50 events in a second every couple of weeks) I will get an error read error on connection to... and Redis::setex(): SSL: Connection reset by peer but I am unsure if that is related to me not treating it like a cluster.