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_AGENT_ENDPOINT_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "osconfig.googleapis.com") used by MakeAgentEndpointServiceConnection().
GOOGLE_CLOUD_CPP_OS_CONFIG_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "osconfig.googleapis.com") used by MakeOsConfigServiceConnection().
GOOGLE_CLOUD_CPP_OS_CONFIG_ZONAL_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "osconfig.googleapis.com") used by MakeOsConfigZonalServiceConnection().
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.
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 2025-04-23 UTC."],[[["The webpage documents multiple versions of the OS Config C++ library, ranging from version 2.11.0 up to the latest release candidate, 2.37.0-rc."],["Several environment variables can be set to modify the library's behavior, such as specifying service endpoints or enabling tracing and logging for debugging."],["Endpoint overrides are configurable through environment variables, including `GOOGLE_CLOUD_CPP_AGENT_ENDPOINT_SERVICE_ENDPOINT`, `GOOGLE_CLOUD_CPP_OS_CONFIG_SERVICE_ENDPOINT`, and `GOOGLE_CLOUD_CPP_OS_CONFIG_ZONAL_SERVICE_ENDPOINT`."],["Tracing and logging can be enabled using environment variables like `GOOGLE_CLOUD_CPP_ENABLE_TRACING` and `GOOGLE_CLOUD_CPP_ENABLE_CLOG`, with additional options to customize the output format."],["The environment variable `GOOGLE_CLOUD_PROJECT` can be used in testing and examples, but it has no impact on the operation of the library."]]],[]]
