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_EXECUTIONS_ENDPOINT=...overrides theEndpointOption(which defaults to "run.googleapis.com") used byMakeExecutionsConnection().
GOOGLE_CLOUD_CPP_JOBS_ENDPOINT=...overrides theEndpointOption(which defaults to "run.googleapis.com") used byMakeJobsConnection().
GOOGLE_CLOUD_CPP_REVISIONS_ENDPOINT=...overrides theEndpointOption(which defaults to "run.googleapis.com") used byMakeRevisionsConnection().
GOOGLE_CLOUD_CPP_RUN_SERVICES_ENDPOINT=...overrides theEndpointOption(which defaults to "run.googleapis.com") used byMakeServicesConnection().
GOOGLE_CLOUD_CPP_TASKS_ENDPOINT=...overrides theEndpointOption(which defaults to "run.googleapis.com") used byMakeTasksConnection().
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 page lists available versions of the C++ library, ranging from version 2.11.0 to the latest release candidate 2.37.0-rc, with direct links to the documentation for each version.\u003c/p\u003e\n"],["\u003cp\u003eThe library's behavior can be configured using environment variables, which are particularly useful for troubleshooting, in addition to having functions available to configure it via code.\u003c/p\u003e\n"],["\u003cp\u003eSpecific environment variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_EXECUTIONS_ENDPOINT\u003c/code\u003e, \u003ccode\u003eGOOGLE_CLOUD_CPP_JOBS_ENDPOINT\u003c/code\u003e, and others allow for overriding the default endpoint for various services.\u003c/p\u003e\n"],["\u003cp\u003eTracing and logging can be enabled and customized using environment variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e, \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e, and \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e, providing control over the granularity and output format of logs.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e environment variable is used for configuration in examples and integration tests but does not have any effect on the functionality of the library.\u003c/p\u003e\n"]]],[],null,["Version 2.35.0keyboard_arrow_down\n\n- [2.42.0-rc (latest)](/cpp/docs/reference/run/latest/run-env)\n- [2.41.0](/cpp/docs/reference/run/2.41.0/run-env)\n- [2.40.0](/cpp/docs/reference/run/2.40.0/run-env)\n- [2.39.0](/cpp/docs/reference/run/2.39.0/run-env)\n- [2.38.0](/cpp/docs/reference/run/2.38.0/run-env)\n- [2.37.0](/cpp/docs/reference/run/2.37.0/run-env)\n- [2.36.0](/cpp/docs/reference/run/2.36.0/run-env)\n- [2.35.0](/cpp/docs/reference/run/2.35.0/run-env)\n- [2.34.0](/cpp/docs/reference/run/2.34.0/run-env)\n- [2.33.0](/cpp/docs/reference/run/2.33.0/run-env)\n- [2.32.0](/cpp/docs/reference/run/2.32.0/run-env)\n- [2.31.0](/cpp/docs/reference/run/2.31.0/run-env)\n- [2.30.0](/cpp/docs/reference/run/2.30.0/run-env)\n- [2.29.0](/cpp/docs/reference/run/2.29.0/run-env)\n- [2.28.0](/cpp/docs/reference/run/2.28.0/run-env)\n- [2.27.0](/cpp/docs/reference/run/2.27.0/run-env)\n- [2.26.0](/cpp/docs/reference/run/2.26.0/run-env)\n- [2.25.1](/cpp/docs/reference/run/2.25.1/run-env)\n- [2.24.0](/cpp/docs/reference/run/2.24.0/run-env)\n- [2.23.0](/cpp/docs/reference/run/2.23.0/run-env)\n- [2.22.1](/cpp/docs/reference/run/2.22.1/run-env)\n- [2.21.0](/cpp/docs/reference/run/2.21.0/run-env)\n- [2.20.0](/cpp/docs/reference/run/2.20.0/run-env)\n- [2.19.0](/cpp/docs/reference/run/2.19.0/run-env)\n- [2.18.0](/cpp/docs/reference/run/2.18.0/run-env)\n- [2.17.0](/cpp/docs/reference/run/2.17.0/run-env)\n- [2.16.0](/cpp/docs/reference/run/2.16.0/run-env)\n- [2.15.1](/cpp/docs/reference/run/2.15.1/run-env)\n- [2.14.0](/cpp/docs/reference/run/2.14.0/run-env)\n- [2.13.0](/cpp/docs/reference/run/2.13.0/run-env)\n- [2.12.0](/cpp/docs/reference/run/2.12.0/run-env)\n- [2.11.0](/cpp/docs/reference/run/2.11.0/run-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_EXECUTIONS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"run.googleapis.com\") used by `MakeExecutionsConnection()`.\n- `GOOGLE_CLOUD_CPP_JOBS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"run.googleapis.com\") used by `MakeJobsConnection()`.\n- `GOOGLE_CLOUD_CPP_REVISIONS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"run.googleapis.com\") used by `MakeRevisionsConnection()`.\n- `GOOGLE_CLOUD_CPP_RUN_SERVICES_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"run.googleapis.com\") used by `MakeServicesConnection()`.\n- `GOOGLE_CLOUD_CPP_TASKS_ENDPOINT=...` overrides the `EndpointOption` (which defaults to \"run.googleapis.com\") used by `MakeTasksConnection()`.\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."]]
