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::deploy_v1::CloudDeployClient(
google::cloud::deploy_v1::MakeCloudDeployConnection(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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-08-14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 page documents various versions of the deployment override authentication feature, ranging from version 2.11.0 up to the latest release candidate 2.37.0-rc.\u003c/p\u003e\n"],["\u003cp\u003eBy default, client libraries use Application Default Credentials for Google Cloud Services, but this can be overridden if needed.\u003c/p\u003e\n"],["\u003cp\u003eTo override default credentials, users can use the \u003ccode\u003eUnifiedCredentialsOption\u003c/code\u003e, such as loading a service account key file as shown in the provided code example.\u003c/p\u003e\n"],["\u003cp\u003eThe example provided shows how to load service account credentials, and users should consult the "Best practices for managing service account keys" guide for more information on managing these keys.\u003c/p\u003e\n"],["\u003cp\u003eFor additional details on creating \u003ccode\u003egoogle::cloud::Credentials\u003c/code\u003e objects, users can refer to the "Authentication Components" documentation.\u003c/p\u003e\n"]]],[],null,[]]
