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_MANAGED_IDENTITIES_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "managedidentities.googleapis.com") used by MakeManagedIdentitiesServiceConnection().
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 2025-03-14 UTC."],[[["The webpage documents environment variables and settings for configuring the behavior of the Managed Identities C++ library, specifically covering version 2.13.0 and newer, up to version 2.37.0-rc (latest)."],["Environment variables like `GOOGLE_CLOUD_CPP_MANAGED_IDENTITIES_SERVICE_ENDPOINT` can override default service endpoints, allowing for customization of connections to the Managed Identities service."],["Tracing for gRPC calls can be enabled using `GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc`, and further modified with `GOOGLE_CLOUD_CPP_TRACING_OPTIONS` to adjust the output behavior of the tracing."],["Logging can be activated in the library by setting `GOOGLE_CLOUD_CPP_ENABLE_CLOG=yes`, which enables output to the program's console, and the library supports custom logging backends via `google::cloud::LogBackend`."],["`GOOGLE_CLOUD_PROJECT` can be set to specify the GCP project for examples and integration tests, but it does not affect the library's core operations."]]],[]]
