sebestyeng

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  • Forum: Plugins
    In reply to: [Redis Object Cache] Not Connected if any Redis node is down
    Thread Starter sebestyeng

    (@sebestyeng)

    3 years, 1 month ago

    Of course. Please note that this is the very first PHP code of my life and I don’t know how to use it properly, I only tested if it can read data from my redis system with one node down.

    <?php
require 'autoload.php';

Predis\Autoloader::register();

$parameters = ['tcp://192.168.40.88?role=master', 'tcp://192.168.40.105'];
$options    = ['replication' => 'predis'];

$client = new Predis\Client($parameters, $options);
$value = $client->get('teszt');
echo $value;
?>

    “Teszt” key is set before by redis-cli set teszt 123

    I can get it nicely:
    (I also did some telnet testing to show you that one – the replica in this case – is down)

    root@SEBILAPTOP:/tmp/predis# php client-test.php
123
root@SEBILAPTOP:/tmp/predis# telnet 192.168.40.105 6379
Trying 192.168.40.105...
telnet: Unable to connect to remote host: Connection refused
root@SEBILAPTOP:/tmp/predis# telnet 192.168.40.88 6379
Trying 192.168.40.88...
Connected to 192.168.40.88.
Escape character is '^]'.
quit
+OK
Connection closed by foreign host.

    Forum: Plugins
    In reply to: [Redis Object Cache] Not Connected if any Redis node is down
    Thread Starter sebestyeng

    (@sebestyeng)

    3 years, 2 months ago

    Thank you for your answer!

    I read the documentation as you suggested but I don’t understand your point here. Even the title topic clearly says “How Redis supports high availability and failover with replication”.

    It is clear the master should be available, but if I stop a replica why it affects the Redis Object Cache plugin’s connection to the redis system while the master is up and ready-to-go?

    In the title of this support ticket I wrote “Not Connected if any Redis node is down“. According to this I’ve created a scenario for you where the master (127.0.0.1) is alive and the replica (192.168.40.105) goes down.

    On overview tab:

    Overview
Status:	 Not connected
Drop-in:	 Valid
Filesystem:	 Writeable

    On diagnostics:

    Status: Not connected
Client: predis
Drop-in: Valid
Disabled: No
Ping: 
Connection Exception: Connection refused [tcp://192.168.40.105:6379] (Predis\Connection\ConnectionException)
Errors: [
    "Connection refused [tcp:\/\/192.168.40.105:6379]"
]

    (wp-config.php is still the same)

    I know predis client can handle this because I’ve tested it with a short PHP code.

Viewing 2 replies - 1 through 2 (of 2 total)