Question 279933 in PHP Question posted in
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PHP gRPC ignores keepalive parameters

I put these 3 parameters:

grpc.keepalive_time_ms=7200000
grpc.keepalive_timeout_ms=200000
grpc.keepalive_permit_without_calls=1

in /etc/php/8.1/apache2/conf.d/20-grpc.ini, /etc/php/8.1/apache2/conf.d/custom-php.ini, /etc/php/8.1/cli/conf.d/20-grpc.ini and /etc/php/8.1/cli/conf.d/custom-php.ini. Then I restart webserver (whole Docker container) and list grpc config with php -i | grep grpc and they are missing from the output:

/etc/php/8.1/cli/conf.d/20-grpc.ini,
grpc
grpc support => enabled
grpc module version => 1.59.1
grpc.enable_fork_support => 0 => 0
grpc.grpc_trace => all,-timer_check => all,-timer_check
grpc.grpc_verbosity => debug => debug
grpc.log_filename => /var/log/grpc.log => /var/log/grpc.log
grpc.poll_strategy => no value => no value

I tested it with PHP 8.1, gRPC extension 1.45.0 and 1.59.1.
What am I doing wrong?

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2

Answers


  1. Chosen as BEST ANSWER
    0

    It turns out these parameters dont belong to PHP .ini config files. They need to be in PHP code, passed as options array into gRPC client class constructor.

    $options['grpc.keepalive_time_ms'] = 7200000;
$options['grpc.keepalive_timeout_ms'] = 200000;    
$options['grpc.keepalive_permit_without_calls'] = 1;

$client = new Client('host:port', $options);

  2. 0

    It seems that you are trying to set the gRPC keepalive parameters in PHP, but they are not taking effect. There are a few possible reasons for this:

    • The gRPC keepalive parameters are only available for the gRPC C extension, not the gRPC PHP extension¹. If you are using the gRPC PHP extension, you will not be able to use these parameters. You can check which extension you are using by running php -m | grep grpc and see if it returns grpc or grpc_c.
    • The gRPC keepalive parameters are only applicable for the client side, not the server side². If you are trying to set them on the server side, they will be ignored. You can only set them on the client side when you create a new gRPC channel, for example:
    <?php
// Create a new gRPC channel with keepalive parameters
$channel = new GrpcChannel('localhost:50051', [
    'grpc.keepalive_time_ms' => 7200000,
    'grpc.keepalive_timeout_ms' => 200000,
    'grpc.keepalive_permit_without_calls' => 1,
]);

// Create a new stub for the service
$stub = new HelloworldGreeterClient($channel);

// Make a unary call
$request = new HelloworldHelloRequest();
$request->setName('world');
list($reply, $status) = $stub->SayHello($request)->wait();
$message = $reply->getMessage();
echo "Greeting: $messagen";
    • The gRPC keepalive parameters are not supported by some proxies or load balancers that may terminate idle connections². If you are using a proxy or a load balancer between your client and server, you may need to configure them to allow HTTP/2 PING frames or increase their idle timeout.
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