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::tpu_v1::TpuClient(
google::cloud::tpu_v1::MakeTpuConnection(options));
}
Follow these links to find examples for other *Client classes:
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-05-07 UTC."],[[["The latest available release candidate version is 2.37.0-rc, and the listed documentation includes versions ranging from 2.11.0 to 2.36.0."],["Client libraries typically use Application Default Credentials for authentication with Google Cloud Services, but this can be overridden."],["Authentication credentials can be overridden by utilizing the `UnifiedCredentialsOption`, such as loading a service account key file."],["Examples of overriding credentials are provided for `tpu_v1::TpuClient` and `tpu_v2::TpuClient` classes."],["For detailed information about creating `google::cloud::Credentials` objects, refer to the Authentication Components section, and review best practices for managing service account keys."]]],[]]
