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::memcache_v1::CloudMemcacheClient(
google::cloud::memcache_v1::MakeCloudMemcacheConnection(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 2025-03-14 UTC."],[[["This document provides a reference for memcache override authentication across multiple versions, ranging from 2.11.0 up to the latest release candidate 2.37.0-rc."],["The client libraries use Application Default Credentials for authentication with Google Cloud Services unless a different configuration is set."],["You can override default authentication by supplying the UnifiedCredentialsOption, for instance, loading a service account key file explicitly."],["The provided code sample illustrates overriding authentication by loading a service account key file, and it is highlighted that this example is easy to understand, and a service account key guide should be consulted for best practices."],["For more information on creating `google::cloud::Credentials` objects, you can consult the Authentication Components documentation."]]],[]]
