A number of environment variables can be used to configure the behavior of the library. There are also functions to configure this behavior in code. The environment variables are convenient when troubleshooting problems.
Endpoint Overrides
GOOGLE_CLOUD_CPP_REACHABILITY_SERVICE_ENDPOINT=... overrides the EndpointOption (which defaults to "networkmanagement.googleapis.com") used by MakeReachabilityServiceConnection().
GOOGLE_CLOUD_CPP_ENABLE_TRACING=rpc: turns on tracing for most gRPC calls. The library injects an additional Stub decorator that prints each gRPC request and response. Unless you have configured your own logging backend, you should also set GOOGLE_CLOUD_CPP_ENABLE_CLOG to produce any output on the program's console.
See Also
google::cloud::TracingComponentsOptionGOOGLE_CLOUD_CPP_TRACING_OPTIONS=...: modifies the behavior of gRPC tracing, including whether messages will be output on multiple lines, or whether string/bytes fields will be truncated.
See Also
google::cloud::GrpcTracingOptionsOptionGOOGLE_CLOUD_CPP_ENABLE_CLOG=yes: turns on logging in the library, basically the library always "logs" but the logging infrastructure has no backend to actually print anything until the application sets a backend or they set this environment variable.
[[["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 outlines environment variables and settings for configuring the behavior of the C++ network management library, particularly when troubleshooting."],["The latest release candidate version is 2.37.0-rc, and there are many previous versions of the C++ network management library readily available for download and use, such as version 2.36.0, 2.35.0 and many more all the way to 2.11.0."],["`GOOGLE_CLOUD_CPP_REACHABILITY_SERVICE_ENDPOINT` can be set to override the default endpoint used by `MakeReachabilityServiceConnection()`, allowing for custom endpoint configurations."],["You can use `GOOGLE_CLOUD_CPP_ENABLE_TRACING` to enable tracing for gRPC calls, which outputs gRPC requests and responses, and `GOOGLE_CLOUD_CPP_ENABLE_CLOG` to produce output to the console, allowing logging to occur."],["`GOOGLE_CLOUD_PROJECT` can be set to define the GCP project when testing, but is not used by the library itself, and is only used for example and testing purposes."]]],[]]
