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::gkeconnect_gateway_v1::GatewayControlClient(
google::cloud::gkeconnect_gateway_v1::MakeGatewayControlConnectionRest(
options));
}
[[["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 latest version of the GKE Connect documentation is 2.37.0-rc, with multiple previous versions available, including 2.36.0, 2.35.0, and others back to 2.29.0."],["Client libraries typically use Application Default Credentials for Google Cloud Service authentication, but this can be overridden."],["Authentication can be overridden by providing the UnifiedCredentialsOption, like loading a service account key file, as shown in the example."],["The example provided demonstrates overriding authentication using a service account key file, but users should refer to the best practices guide for managing service account keys."],["Additional information on creating `google::cloud::Credentials` objects can be found in the Authentication Components section."]]],[]]
