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_ATTACHED_CLUSTERS_ENDPOINT=...overrides theEndpointOption(which defaults to "
GOOGLE_CLOUD_CPP_AWS_CLUSTERS_ENDPOINT=...overrides theEndpointOption(which defaults to "
GOOGLE_CLOUD_CPP_AZURE_CLUSTERS_ENDPOINT=...overrides theEndpointOption(which defaults to "
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::LoggingComponentsOptionGOOGLE_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\u003eThis document provides version-specific documentation for the Google Cloud C++ client library's GKE Multi-Cloud environment, with the latest version being 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe document lists environment variables that can be used to configure the behavior of the library, offering options for troubleshooting and customization.\u003c/p\u003e\n"],["\u003cp\u003eEndpoint overrides are available through environment variables, such as \u003ccode\u003eGOOGLE_CLOUD_CPP_ATTACHED_CLUSTERS_ENDPOINT\u003c/code\u003e, to customize the default endpoint.\u003c/p\u003e\n"],["\u003cp\u003eTracing and logging can be enabled and configured via environment variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e, allowing detailed monitoring of gRPC calls.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e environment variable is mentioned for use within examples and testing, but it does not affect library function.\u003c/p\u003e\n"]]],[],null,["Version 2.32.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/gkemulticloud/latest/gkemulticloud-env)\n- [2.41.0](/cpp/docs/reference/gkemulticloud/2.41.0/gkemulticloud-env)\n- [2.40.0](/cpp/docs/reference/gkemulticloud/2.40.0/gkemulticloud-env)\n- [2.39.0](/cpp/docs/reference/gkemulticloud/2.39.0/gkemulticloud-env)\n- [2.38.0](/cpp/docs/reference/gkemulticloud/2.38.0/gkemulticloud-env)\n- [2.37.0](/cpp/docs/reference/gkemulticloud/2.37.0/gkemulticloud-env)\n- [2.36.0](/cpp/docs/reference/gkemulticloud/2.36.0/gkemulticloud-env)\n- [2.35.0](/cpp/docs/reference/gkemulticloud/2.35.0/gkemulticloud-env)\n- [2.34.0](/cpp/docs/reference/gkemulticloud/2.34.0/gkemulticloud-env)\n- [2.33.0](/cpp/docs/reference/gkemulticloud/2.33.0/gkemulticloud-env)\n- [2.32.0](/cpp/docs/reference/gkemulticloud/2.32.0/gkemulticloud-env)\n- [2.31.0](/cpp/docs/reference/gkemulticloud/2.31.0/gkemulticloud-env)\n- [2.30.0](/cpp/docs/reference/gkemulticloud/2.30.0/gkemulticloud-env)\n- [2.29.0](/cpp/docs/reference/gkemulticloud/2.29.0/gkemulticloud-env)\n- [2.28.0](/cpp/docs/reference/gkemulticloud/2.28.0/gkemulticloud-env)\n- [2.27.0](/cpp/docs/reference/gkemulticloud/2.27.0/gkemulticloud-env)\n- [2.26.0](/cpp/docs/reference/gkemulticloud/2.26.0/gkemulticloud-env)\n- [2.25.1](/cpp/docs/reference/gkemulticloud/2.25.1/gkemulticloud-env)\n- [2.24.0](/cpp/docs/reference/gkemulticloud/2.24.0/gkemulticloud-env)\n- [2.23.0](/cpp/docs/reference/gkemulticloud/2.23.0/gkemulticloud-env)\n- [2.22.1](/cpp/docs/reference/gkemulticloud/2.22.1/gkemulticloud-env)\n- [2.21.0](/cpp/docs/reference/gkemulticloud/2.21.0/gkemulticloud-env)\n- [2.20.0](/cpp/docs/reference/gkemulticloud/2.20.0/gkemulticloud-env)\n- [2.19.0](/cpp/docs/reference/gkemulticloud/2.19.0/gkemulticloud-env)\n- [2.18.0](/cpp/docs/reference/gkemulticloud/2.18.0/gkemulticloud-env)\n- [2.17.0](/cpp/docs/reference/gkemulticloud/2.17.0/gkemulticloud-env)\n- [2.16.0](/cpp/docs/reference/gkemulticloud/2.16.0/gkemulticloud-env)\n- [2.15.1](/cpp/docs/reference/gkemulticloud/2.15.1/gkemulticloud-env)\n- [2.14.0](/cpp/docs/reference/gkemulticloud/2.14.0/gkemulticloud-env)\n- [2.13.0](/cpp/docs/reference/gkemulticloud/2.13.0/gkemulticloud-env)\n- [2.12.0](/cpp/docs/reference/gkemulticloud/2.12.0/gkemulticloud-env)\n- [2.11.0](/cpp/docs/reference/gkemulticloud/2.11.0/gkemulticloud-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_ATTACHED_CLUSTERS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"\n- `GOOGLE_CLOUD_CPP_AWS_CLUSTERS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"\n- `GOOGLE_CLOUD_CPP_AZURE_CLUSTERS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"\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::LoggingComponentsOption`](https://cloud.google.com/cpp/docs/reference/common/latest/structgoogle_1_1cloud_1_1LoggingComponentsOption.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."]]
