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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::container_v1::ClusterManagerClient( google::cloud::container_v1::MakeClusterManagerConnection(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 2025-03-21 UTC."],[[["The latest version available is 2.37.0-rc, with numerous other versions accessible for review, ranging down to version 2.11.0."],["By default, client libraries use Application Default Credentials for authenticating with Google Cloud Services, but this can be overridden."],["To override the default credentials, you can use the `UnifiedCredentialsOption`, demonstrated in an example showing how to load a service account key file."],["The provided example shows the explicit loading of a service account key file using `UnifiedCredentialsOption`."],["Refer to the \"Best practices for managing service account keys\" and \"Authentication Components\" for additional details on handling service account keys and creating `google::cloud::Credentials` objects."]]],[]]
