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::run_v2::ExecutionsClient(
google::cloud::run_v2::MakeExecutionsConnection(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 2025-03-14 UTC."],[[["This page details how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services."],["The latest version is 2.37.0-rc, and the content lists available versions down to 2.11.0, covering a range of documentation for overriding authentication."],["You can override the default credentials by using the `UnifiedCredentialsOption`, such as by loading a service account key file as shown in the provided example code."],["Examples for overriding authentication are available for various client classes, including `run_v2::ExecutionsClient`, `run_v2::JobsClient`, `run_v2::RevisionsClient`, `run_v2::ServicesClient`, and `run_v2::TasksClient`."],["The document also recommends checking the Best practices for managing service account keys and to consult the Authentication Components section for more information on the `google::cloud::Credentials` objects."]]],[]]
