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73 lines
1.4 KiB
Groff
73 lines
1.4 KiB
Groff
.\" Generated by Mmark Markdown Processer - mmark.miek.nl
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.TH "COREDNS-GRPC_SERVER" 7 "March 2026" "CoreDNS" "CoreDNS Plugins"
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.SH "NAME"
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.PP
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\fIgrpc_server\fP - configures DNS-over-gRPC server options.
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.SH "DESCRIPTION"
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.PP
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The \fIgrpc_server\fP plugin allows you to configure parameters for the DNS-over-gRPC server to fine-tune the security posture and performance of the server.
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.PP
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This plugin can only be used once per gRPC listener block.
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.SH "SYNTAX"
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.PP
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.RS
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.nf
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grpc\_server {
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max\_streams POSITIVE\_INTEGER
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max\_connections POSITIVE\_INTEGER
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}
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.fi
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.RE
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.IP \(bu 4
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\fB\fCmax_streams\fR limits the number of concurrent gRPC streams per connection. This helps prevent unbounded streams on a single connection, exhausting server resources. The default value is 256 if not specified. Set to 0 for unbounded.
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.IP \(bu 4
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\fB\fCmax_connections\fR limits the number of concurrent TCP connections to the gRPC server. The default value is 200 if not specified. Set to 0 for unbounded.
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.SH "EXAMPLES"
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.PP
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Set custom limits for maximum streams and connections:
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.PP
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.RS
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.nf
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grpc://.:8053 {
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tls cert.pem key.pem
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grpc\_server {
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max\_streams 50
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max\_connections 100
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}
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whoami
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}
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.fi
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.RE
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.PP
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Set values to 0 for unbounded, matching CoreDNS behaviour before v1.14.0:
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.PP
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.RS
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.nf
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grpc://.:8053 {
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tls cert.pem key.pem
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grpc\_server {
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max\_streams 0
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max\_connections 0
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}
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whoami
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}
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.fi
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.RE
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