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::netapp_v1::NetAppClient(
google::cloud::netapp_v1::MakeNetAppConnection(options));
}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14 UTC."],[[["\u003cp\u003eThe latest version available is 2.37.0-rc, with multiple older versions, starting at 2.20.0, also listed for reference.\u003c/p\u003e\n"],["\u003cp\u003eBy default, the client libraries will authenticate with Google Cloud Services using Application Default Credentials.\u003c/p\u003e\n"],["\u003cp\u003eTo override the default authentication, users can use \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e to explicitly load a service account key file, as demonstrated in the provided example.\u003c/p\u003e\n"],["\u003cp\u003eFor further information, the documentation provides links to resources on Authentication Components and best practices for managing service account keys.\u003c/p\u003e\n"]]],[],null,[]]
