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::deploy_v1::CloudDeployClient(
google::cloud::deploy_v1::MakeCloudDeployConnection(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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 available version is 2.37.0-rc, with version 2.36.0 being the current stable version.\u003c/p\u003e\n"],["\u003cp\u003eThis documentation provides links to documentation for versions ranging from 2.11.0 up to the latest release candidate.\u003c/p\u003e\n"],["\u003cp\u003eClient libraries typically use Application Default Credentials (ADC) for authentication with Google Cloud Services, but you can use \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e to override this default.\u003c/p\u003e\n"],["\u003cp\u003eAn example demonstrates how to explicitly load a service account key file to override the default credentials.\u003c/p\u003e\n"],["\u003cp\u003eThe documentation also references the 'Best practices for managing service account keys' guide for more information.\u003c/p\u003e\n"]]],[],null,[]]
