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 2025-04-09 UTC."],[[["This page provides documentation for overriding default authentication credentials when using Google Cloud client libraries, which typically rely on Application Default Credentials."],["Users can override the default authentication by providing the `UnifiedCredentialsOption`, such as explicitly loading a service account key file as demonstrated in the example."],["Documentation is available for various client classes like `ExecutionsClient`, `JobsClient`, `RevisionsClient`, `ServicesClient`, and `TasksClient` for Run v2, showing examples of how to implement service account overrides."],["The latest version's documentation can be found at the relative path `/cpp/docs/reference/run/latest/run-override-authentication` and this page also provides documentation for previous versions all the way down to 2.11.0."]]],[]]
