Question Docker Redis throws 'read error on connection'

[xmh87]

I've been using Redis on a docker image for a short while (a week or so), installed through plesk with success. We've decided to upgrade the hardware of the VPS server and after the upgrade & reboot the docker Redis throws "read error on connection" when trying to do anything other than connecting.


I've tried setting PHP's default_socket_timeout

ini_set('default_socket_timeout', -1);

and the redis timeout:

$clientRedis->setOption(Redis::OPT_READ_TIMEOUT, -1);

But still the error remains..
Here's my code I use for testing:

    <?php
    error_reporting(E_ALL);
    ini_set('display_errors', 1);
    ini_set('default_socket_timeout', -1);
    
    $clientRedis = new Redis();
    
    function Redis_connect($hostname, $port){
        $start = time();
        global $clientRedis;
        try {
            
            $connected = $clientRedis->connect($hostname, $port);
            
            $clientRedis->setOption(Redis::OPT_READ_TIMEOUT, -1);
            if (!$connected) { throw new Exception(); }
        } catch (Exception $e) {
            $elapsed = time() - $start;
            echo "Elapsed: " . $elapsed . "\n";
            die($e->getMessage());
        }
    
    
    }
    
    //Connecting to Redis server on localhost
    echo Redis_connect("127.0.0.1", 6379);
    
    
    echo "Connected to server successfully";
    echo "";
    echo "Server is running: " . $clientRedis->ping();
    echo "";
    
    
    ?>

This outputs:

    Connected to server successfully
    Fatal error: Uncaught RedisException: read error on connection in [..]/redis.php:32 Stack trace: #0 [..]/redis.php(32): Redis->ping() #1 {main} thrown in [..]/redis.php on line 32

the only thing I could find on Google was the timeout settings mentioned above, which did not work. I've tried several image versions, alpine, latest, 5.0.8; all the same error.
Strangest thing is that it worked before the reboot/upgrade. The VPS company won't provide any support because it is software..


Does anyone know what's going on here?