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COREDNS-GRPC_SERVER(7)		 CoreDNS Plugins	  COREDNS-GRPC_SERVER(7)

NAME
     grpc_server - configures DNS-over-gRPC server options.

DESCRIPTION
     The grpc_server plugin allows you to configure parameters for the DNS-over-
     gRPC  server  to  fine-tune  the  security  posture  and performance of the
     server.

     This plugin can only be used once per gRPC listener block.

SYNTAX
	    grpc_server {
		max_streams POSITIVE_INTEGER
		max_connections POSITIVE_INTEGER
	    }

     *	 max_streams limits the number of concurrent gRPC  streams  per  connec-
	 tion.	This helps prevent unbounded streams on a single connection, ex-
	 hausting server resources. The default value is 256 if  not  specified.
	 Set to 0 for unbounded.

     *	 max_connections  limits the number of concurrent TCP connections to the
	 gRPC server. The default value is 200 if not specified. Set  to  0  for
	 unbounded.

EXAMPLES
     Set custom limits for maximum streams and connections:

	    grpc://.:8053 {
		tls cert.pem key.pem
		grpc_server {
		    max_streams 50
		    max_connections 100
		}
		whoami
	    }

     Set values to 0 for unbounded, matching CoreDNS behaviour before v1.14.0:

	    grpc://.:8053 {
		tls cert.pem key.pem
		grpc_server {
		    max_streams 0
		    max_connections 0
		}
		whoami
	    }

CoreDNS 			   March 2026		  COREDNS-GRPC_SERVER(7)

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