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 2025-03-21 UTC."],[[["The page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, which normally use Application Default Credentials."],["The most recent version available for the TPU override authentication documentation is 2.37.0-rc, while version 2.12.0 is shown on the page."],["The documentation explains how to explicitly load a service account key file using `UnifiedCredentialsOption` and `MakeServiceAccountCredentials`, demonstrated with sample code."],["Examples are provided for both `tpu_v1::TpuClient` and `tpu_v2::TpuClient` classes to illustrate the override process with service account snippets."],["The documentation refers users to additional information, such as best practices for managing service account keys and a guide for authentication components."]]],[]]
