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::gkebackup_v1::BackupForGKEClient(
google::cloud::gkebackup_v1::MakeBackupForGKEConnection(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 2025-03-14 UTC."],[[["The webpage provides documentation for various versions of the `gkebackup` library, ranging from version 2.12.0 up to the latest release candidate, 2.37.0-rc."],["The default authentication for the client libraries uses Application Default Credentials, but you can override this by providing the UnifiedCredentialsOption."],["Overriding the default authentication can be achieved by loading a service account key file, as demonstrated in the provided example using the `UnifiedCredentialsOption`."],["The provided example demonstrates overriding the default credentials by reading a service account key file and using `MakeServiceAccountCredentials` and `UnifiedCredentialsOption`."],["For more details on creating `google::cloud::Credentials` objects and factory functions, refer to the Authentication Components section."]]],[]]
