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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:
run_v2::ExecutionsClient
run_v2::JobsClient
run_v2::RevisionsClient
run_v2::ServicesClient
run_v2::TasksClient
Keep in mind that we chose this as an example because it is relatively easy to understand. Consult the Best practices for managing service account keys guide for more details.
See AlsoAuthentication Components - for more information on the factory functions to create google::cloud::Credentials
objects.
Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2025-08-14 UTC.
[[["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 2025-08-14 UTC."],[[["This page details how to override the default Application Default Credentials (ADC) for authenticating with Google Cloud Services when using C++ client libraries."],["The latest version documented is 2.37.0-rc, with a list of previous versions available, from 2.36.0 down to 2.11.0, each with their own respective link to their own documentation."],["Authentication can be overridden by using the `UnifiedCredentialsOption`, as demonstrated by the example that shows how to load a service account key file."],["Examples are provided for `run_v2::ExecutionsClient`, `run_v2::JobsClient`, `run_v2::RevisionsClient`, `run_v2::ServicesClient`, and `run_v2::TasksClient` classes."],["For more details on managing service account keys and creating `google::cloud::Credentials` objects, refer to the provided links for best practices and authentication components."]]],[]]
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