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::alloydb_v1::AlloyDBAdminClient(
google::cloud::alloydb_v1::MakeAlloyDBAdminConnection(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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 latest version available is 2.37.0-rc, with numerous other versions, such as 2.36.0, 2.35.0, and so on, down to 2.11.0, also accessible.\u003c/p\u003e\n"],["\u003cp\u003eThe document outlines how to override default authentication credentials, typically Application Default Credentials, used by client libraries.\u003c/p\u003e\n"],["\u003cp\u003eOverriding the default credentials can be achieved by utilizing the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e and providing custom credentials.\u003c/p\u003e\n"],["\u003cp\u003eAn example is provided, demonstrating how to load authentication details from a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eFor additional details on managing service account keys and authentication components, refer to the linked best practices and authentication components documentation, respectively.\u003c/p\u003e\n"]]],[],null,[]]
