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::parallelstore_v1::ParallelstoreClient(
google::cloud::parallelstore_v1::MakeParallelstoreConnection(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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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\u003eThis document details how to override the default Application Default Credentials used by client libraries for Google Cloud Services.\u003c/p\u003e\n"],["\u003cp\u003eOverriding default credentials involves providing the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, as demonstrated through loading a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eThe provided example uses a service account key file to create new credentials, showing how to set up a new \u003ccode\u003eParallelstoreClient\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eIt's important to note that while the example is straightforward, it is essential to review best practices for managing service account keys as detailed in the provided link.\u003c/p\u003e\n"],["\u003cp\u003eFurther information regarding factory functions to create \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects can be found under the Authentication Components section.\u003c/p\u003e\n"]]],[],null,[]]
