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_BACKUP_DR_ENDPOINT=... overrides the EndpointOption (which defaults to "backupdr.googleapis.com") used by MakeBackupDRConnection().
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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 details environment variables and settings for configuring the behavior of the Backup and DR (Disaster Recovery) C++ library, with version history provided.\u003c/p\u003e\n"],["\u003cp\u003eThe environment variable \u003ccode\u003eGOOGLE_CLOUD_CPP_BACKUP_DR_ENDPOINT\u003c/code\u003e can be used to override the default endpoint used by \u003ccode\u003eMakeBackupDRConnection()\u003c/code\u003e, which defaults to "backupdr.googleapis.com".\u003c/p\u003e\n"],["\u003cp\u003eEnabling gRPC tracing is possible by setting \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc\u003c/code\u003e, which will log each gRPC request and response, while also requiring \u003ccode\u003eGOOGLE_CLOUD_CPP_ENABLE_CLOG\u003c/code\u003e to output to the console.\u003c/p\u003e\n"],["\u003cp\u003eThe behavior of gRPC tracing can be modified with the \u003ccode\u003eGOOGLE_CLOUD_CPP_TRACING_OPTIONS\u003c/code\u003e variable, which allows for customization like message formatting and field truncation.\u003c/p\u003e\n"],["\u003cp\u003eThe project can be set with the \u003ccode\u003eGOOGLE_CLOUD_PROJECT\u003c/code\u003e environment variable, however, it is only used in examples and integration tests and will have no effect on the library.\u003c/p\u003e\n"]]],[],null,[]]
