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_AUTOKEY_ADMIN_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudkms.googleapis.com") used by MakeAutokeyAdminConnection().
GOOGLE_CLOUD_CPP_AUTOKEY_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudkms.googleapis.com") used by MakeAutokeyConnection().
GOOGLE_CLOUD_CPP_EKM_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudkms.googleapis.com") used by MakeEkmServiceConnection().
GOOGLE_CLOUD_CPP_KEY_DASHBOARD_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "kmsinventory.googleapis.com") used by MakeKeyDashboardServiceConnection().
GOOGLE_CLOUD_CPP_KEY_MANAGEMENT_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "cloudkms.googleapis.com") used by MakeKeyManagementServiceConnection().
GOOGLE_CLOUD_CPP_KEY_TRACKING_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "kmsinventory.googleapis.com") used by MakeKeyTrackingServiceConnection().
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::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"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThis document provides version-specific documentation for the C++ KMS (Key Management Service) library, listing versions from 2.37.0-rc down to 2.10.1, with the current version highlighted as 2.26.0.\u003c/p\u003e\n"],["\u003cp\u003eThe library's behavior can be configured via several environment variables, offering flexibility for troubleshooting and adjusting service endpoints such as \u003ccode\u003eGOOGLE_CLOUD_CPP_AUTOKEY_ADMIN_ENDPOINT\u003c/code\u003e, and \u003ccode\u003eGOOGLE_CLOUD_CPP_KEY_MANAGEMENT_SERVICE_ENDPOINT\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eLogging and tracing for gRPC calls can be enabled and customized through environment variables like \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e, respectively.\u003c/p\u003e\n"],["\u003cp\u003eThe environment variable \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e will turn on logging within the library, allowing the ability for the logging information to be displayed if a backend has not been configured.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e can be set as an environment variable to configure the GCP project in examples and integration tests, however, this is not used within the library itself.\u003c/p\u003e\n"]]],[],null,[]]
