A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.
Endpoint Overrides
GOOGLE_CLOUD_CPP_REACHABILITY_SERVICE_ENDPOINT=...overrides theEndpointOption(which defaults to "networkmanagement.googleapis.com") used byMakeReachabilityServiceConnection().
GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also setGOOGLE_CLOUD_CPP_ENABLE_CLOGto produce any output on the program's console.
See Also
google::cloud::TracingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.
See Also
google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-09-04 UTC."],[[["\u003cp\u003eThe latest release candidate version for Network Management is 2.37.0-rc, accessible via the provided link.\u003c/p\u003e\n"],["\u003cp\u003eThis page provides access to documentation for multiple versions of Network Management, ranging from 2.11.0 up to the latest release candidate.\u003c/p\u003e\n"],["\u003cp\u003eEnvironment variables can be utilized to customize library behavior, particularly helpful for troubleshooting, and functions in the code are available to achieve the same customization.\u003c/p\u003e\n"],["\u003cp\u003eTracing can be enabled for most gRPC calls via \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, with additional options available to manage the tracing output's format and verbosity, and output to the console can be enabled using \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_CPP_REACHABILITY_SERVICE_ENDPOINT\u003c/code\u003e can be used to override the default endpoint used by \u003ccode\u003eMakeReachabilityServiceConnection()\u003c/code\u003e, allowing for customization of the service's network location.\u003c/p\u003e\n"]]],[],null,["Version 2.14.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/networkmanagement/latest/networkmanagement-env)\n- [2.41.0](/cpp/docs/reference/networkmanagement/2.41.0/networkmanagement-env)\n- [2.40.0](/cpp/docs/reference/networkmanagement/2.40.0/networkmanagement-env)\n- [2.39.0](/cpp/docs/reference/networkmanagement/2.39.0/networkmanagement-env)\n- [2.38.0](/cpp/docs/reference/networkmanagement/2.38.0/networkmanagement-env)\n- [2.37.0](/cpp/docs/reference/networkmanagement/2.37.0/networkmanagement-env)\n- [2.36.0](/cpp/docs/reference/networkmanagement/2.36.0/networkmanagement-env)\n- [2.35.0](/cpp/docs/reference/networkmanagement/2.35.0/networkmanagement-env)\n- [2.34.0](/cpp/docs/reference/networkmanagement/2.34.0/networkmanagement-env)\n- [2.33.0](/cpp/docs/reference/networkmanagement/2.33.0/networkmanagement-env)\n- [2.32.0](/cpp/docs/reference/networkmanagement/2.32.0/networkmanagement-env)\n- [2.31.0](/cpp/docs/reference/networkmanagement/2.31.0/networkmanagement-env)\n- [2.30.0](/cpp/docs/reference/networkmanagement/2.30.0/networkmanagement-env)\n- [2.29.0](/cpp/docs/reference/networkmanagement/2.29.0/networkmanagement-env)\n- [2.28.0](/cpp/docs/reference/networkmanagement/2.28.0/networkmanagement-env)\n- [2.27.0](/cpp/docs/reference/networkmanagement/2.27.0/networkmanagement-env)\n- [2.26.0](/cpp/docs/reference/networkmanagement/2.26.0/networkmanagement-env)\n- [2.25.1](/cpp/docs/reference/networkmanagement/2.25.1/networkmanagement-env)\n- [2.24.0](/cpp/docs/reference/networkmanagement/2.24.0/networkmanagement-env)\n- [2.23.0](/cpp/docs/reference/networkmanagement/2.23.0/networkmanagement-env)\n- [2.22.1](/cpp/docs/reference/networkmanagement/2.22.1/networkmanagement-env)\n- [2.21.0](/cpp/docs/reference/networkmanagement/2.21.0/networkmanagement-env)\n- [2.20.0](/cpp/docs/reference/networkmanagement/2.20.0/networkmanagement-env)\n- [2.19.0](/cpp/docs/reference/networkmanagement/2.19.0/networkmanagement-env)\n- [2.18.0](/cpp/docs/reference/networkmanagement/2.18.0/networkmanagement-env)\n- [2.17.0](/cpp/docs/reference/networkmanagement/2.17.0/networkmanagement-env)\n- [2.16.0](/cpp/docs/reference/networkmanagement/2.16.0/networkmanagement-env)\n- [2.15.1](/cpp/docs/reference/networkmanagement/2.15.1/networkmanagement-env)\n- [2.14.0](/cpp/docs/reference/networkmanagement/2.14.0/networkmanagement-env)\n- [2.13.0](/cpp/docs/reference/networkmanagement/2.13.0/networkmanagement-env)\n- [2.12.0](/cpp/docs/reference/networkmanagement/2.12.0/networkmanagement-env)\n- [2.11.0](/cpp/docs/reference/networkmanagement/2.11.0/networkmanagement-env) \n\nEnvironment Variables\n=====================\n\nA number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.\n\nEndpoint Overrides\n------------------\n\n- `GOOGLE_CLOUD_CPP_REACHABILITY_SERVICE_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"networkmanagement.googleapis.com\") used by `MakeReachabilityServiceConnection()`.\n\n###### See Also\n\n[`google::cloud::EndpointOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1EndpointOption.html)\n\nLogging\n-------\n\n`GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to produce any output on the program's console.\n\n###### See Also\n\n[`google::cloud::TracingComponentsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1TracingComponentsOption.html)`GOOGLE_CLOUD_CPP_TRACING_OPTIONS=...`: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.\n\n###### See Also\n\n[`google::cloud::GrpcTracingOptionsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1GrpcTracingOptionsOption.html)`GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`: turns on logging in the library, basically the library always \"logs\" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.\n\n###### See Also\n\n[`google::cloud::LogBackend`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogBackend.html)\n\n###### See Also\n\n[`google::cloud::LogSink`](https://cloud.google.com/cpp/docs/reference/common/latest/classgoogle_1_1cloud_1_1LogSink.html)\n\nSetting the Default Project\n---------------------------\n\n`GOOGLE_CLOUD_PROJECT=...`: is used in examples and integration tests to configure the GCP project. This has no effect in the library."]]
