Unless otherwise configured, the client libraries use Application Default Credentials to authenticate with Google Cloud Services. While this works for most applications, in some cases you may need to override this default. You can do so by providing the UnifiedCredentialsOption The following example shows how to explicitly load a service account key file:
[](std::string const& keyfile) {
auto is = std::ifstream(keyfile);
is.exceptions(std::ios::badbit); // Minimal error handling in examples
auto contents = std::string(std::istreambuf_iterator<char>(is.rdbuf()), {});
auto options =
google::cloud::Options{}.set<google::cloud::UnifiedCredentialsOption>(
google::cloud::MakeServiceAccountCredentials(contents));
return google::cloud::profiler_v2::ProfilerServiceClient(
google::cloud::profiler_v2::MakeProfilerServiceConnection(options));
}
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThe webpage provides documentation for various versions of the profiler, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eThe primary content of the page explains how to override the default Application Default Credentials (ADC) used by client libraries for authentication with Google Cloud Services.\u003c/p\u003e\n"],["\u003cp\u003eOverriding default credentials can be accomplished using the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, as demonstrated in the example using a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eThe provided example demonstrates the process of explicitly loading a service account key file to override default credentials, and it recommends further study of best practices for service account key management.\u003c/p\u003e\n"],["\u003cp\u003eThe page includes a link to the "Authentication Components" documentation for additional information on creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects.\u003c/p\u003e\n"]]],[],null,[]]
