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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 page lists available versions of the C++ KMS library, ranging from version 2.10.1 up to the latest release candidate 2.37.0-rc, with links to the documentation for each version.\u003c/p\u003e\n"],["\u003cp\u003eThe library's behavior can be configured using various environment variables, which are particularly helpful when debugging issues.\u003c/p\u003e\n"],["\u003cp\u003eEndpoint overrides can be set via specific environment variables such as \u003ccode\u003eGOOGLE_CLOUD_CPP_AUTOKEY_ADMIN_ENDPOINT\u003c/code\u003e and \u003ccode\u003eGOOGLE_CLOUD_CPP_KEY_MANAGEMENT_SERVICE_ENDPOINT\u003c/code\u003e, allowing customization of the default endpoints.\u003c/p\u003e\n"],["\u003cp\u003eLogging can be activated and customized with 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, enabling detailed tracking and output of gRPC calls and library operations.\u003c/p\u003e\n"],["\u003cp\u003e\u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e can be set to configure a GCP project for integration tests, but it has no effect on the behaviour of the library itself.\u003c/p\u003e\n"]]],[],null,[]]
