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_OS_LOGIN_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "oslogin.googleapis.com") used by MakeOsLoginServiceConnection().
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 2025-05-07 UTC."],[[["The latest release candidate version for OS Login is 2.37.0-rc, while version 2.24.0 is also listed within the available versions."],["Environment variables can be utilized to customize the library's behavior, particularly useful for troubleshooting."],["The `GOOGLE_CLOUD_CPP_OS_LOGIN_SERVICE_ENDPOINT` environment variable can override the default endpoint used by `MakeOsLoginServiceConnection()`."],["Enabling tracing for gRPC calls is possible by setting `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and logging can be activated with `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`."],["The `GOOGLE_CLOUD_PROJECT` environment variable is solely for examples and integration tests to configure the GCP project and does not have any effect within the library itself."]]],[]]
