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 2025-04-09 UTC."],[[["This document provides a comprehensive list of memcache versions, ranging from the latest release candidate, 2.37.0-rc, down to version 2.11.0, each with links to its respective documentation."],["The default authentication method for client libraries is Application Default Credentials, but this can be overridden for specific use cases."],["You can override default authentication credentials by using the `UnifiedCredentialsOption` and loading a service account key file."],["The provided example demonstrates how to explicitly load a service account key file for authentication."],["The document suggests consulting the \"Best practices for managing service account keys\" guide for more details on service account key management and the \"Authentication Components\" section for details on factory functions to create credentials objects."]]],[]]
