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::redis_cluster_v1::CloudRedisClusterClient(
google::cloud::redis_cluster_v1::MakeCloudRedisClusterConnection(
options));
}
Follow these links to find examples for other *Client classes:
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 numerous other versions, such as 2.36.0, 2.35.0, and so on, down to 2.11.0, also accessible.\u003c/p\u003e\n"],["\u003cp\u003eThe default authentication method for client libraries is using Application Default Credentials, but this can be overridden.\u003c/p\u003e\n"],["\u003cp\u003eTo override the default authentication, you can use the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e by providing a service account key file.\u003c/p\u003e\n"],["\u003cp\u003eExamples for overriding authentication are available for \u003ccode\u003eredis_cluster_v1::CloudRedisClusterClient\u003c/code\u003e and \u003ccode\u003eredis_v1::CloudRedisClient\u003c/code\u003e.\u003c/p\u003e\n"],["\u003cp\u003eFor managing service accounts, you should check out the 'Best practices for managing service account keys' guide and the authentication components section for more details.\u003c/p\u003e\n"]]],[],null,[]]
