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::vmmigration_v1::VmMigrationClient(
google::cloud::vmmigration_v1::MakeVmMigrationConnection(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."],[[["This page documents the vmmigration-override-authentication feature across multiple versions, from version 2.11.0 up to the latest release candidate 2.37.0-rc."],["The latest version available is 2.37.0-rc, and each version includes documentation for overriding authentication credentials in the vmmigration service."],["Client libraries use Application Default Credentials for authentication by default, but users can override this with UnifiedCredentialsOption."],["A service account key file can be loaded explicitly to override default credentials, as demonstrated in the provided code example."],["For further details, users can refer to the \"Best practices for managing service account keys\" guide and the \"Authentication Components\" documentation."]]],[]]
