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::container_v1::ClusterManagerClient(
google::cloud::container_v1::MakeClusterManagerConnection(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 webpage provides documentation for various versions of a C++ library, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The content primarily focuses on how to override the default authentication credentials used by the client libraries when interacting with Google Cloud Services."],["Users can override the default credentials by providing a `UnifiedCredentialsOption`, which is demonstrated with an example of loading a service account key file."],["The documentation highlights the importance of managing service account keys securely and directs users to a guide on best practices for this."],["Additional information about creating `google::cloud::Credentials` objects can be found in the \"Authentication Components\" section of the documentation."]]],[]]
