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38 lines
2.4 KiB
38 lines
2.4 KiB
2 years ago
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# gRPC C++ xDS Hello World Example
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This xDS example builds on the [Hello World Example](https://github.com/grpc/grpc/tree/master/examples/cpp/helloworld) and changes the gRPC client and server to accept configuration from an xDS control plane.
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## Configuration
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The client takes two command-line arguments -
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* target - By default, the client tries to connect to the xDS "xds:///helloworld:50051" and gRPC would use xDS to resolve this target and connect to the server backend. This can be overriden to change the target.
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* secure - Bool value, defaults to true. When this is set, [XdsCredentials](https://github.com/grpc/proposal/blob/master/A29-xds-tls-security.md) will be used with a fallback on `InsecureChannelCredentials`. If unset, `InsecureChannelCredentials` will be used.
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The server takes three command-line arguments -
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* port - Port on which the Hello World service is run. Defaults to 50051.
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* mantenance_port - If secure mode is used (see below), the [Admin](https://github.com/grpc/proposal/blob/master/A38-admin-interface-api.md) service is exposed on this port. If secure mode is not used, `maintenance_port` is unused, and the Admin service is just exposed on `port`. Defaults to 50052.
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* secure - Bool value, defaults to true. When this is set, [XdsServerCredentials](https://github.com/grpc/proposal/blob/master/A29-xds-tls-security.md) will be used with a fallback on `InsecureServerCredentials`. If unset, `InsecureServerCredentials` will be used.
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## Running the example
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Currently, this example and some of the gRPC xDS libraries that it depends on only builds with bazel. CMake support will be introduced in the future.
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To use XDS, you should first deploy the XDS management server in your deployment environment and know its name. You need to set the `GRPC_XDS_BOOTSTRAP` environment variable to point to the gRPC XDS bootstrap file (see [gRFC A27](https://github.com/grpc/proposal/blob/master/A27-xds-global-load-balancing.md#xdsclient-and-bootstrap-file) for the bootstrap format). This is needed by both client and server.
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Please view [GCP instructions](https://cloud.google.com/traffic-director/docs/security-proxyless-setup) as an example.
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To run the server -
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```
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$ export GRPC_XDS_BOOTSTRAP=/path/to/bootstrap.json
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$ tools/bazel run examples/cpp/xds:greeter_server
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```
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To run the client -
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```
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$ export GRPC_XDS_BOOTSTRAP=/path/to/bootstrap.json
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$ tools/bazel run examples/cpp/xds:greeter_client
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```
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