You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
2.0 KiB
44 lines
2.0 KiB
4 months ago
|
# Troubleshooting gRPC
|
||
|
|
|
||
|
|
This guide is for troubleshooting gRPC implementations based on C core library (sources for most of them are living in the `grpc/grpc` repository).
|
||
|
|
|
||
|
|
## Enabling extra logging and tracing
|
||
|
|
|
||
|
|
Extra logging can be very useful for diagnosing problems. All gRPC implementations based on C core library support
|
||
|
|
the `GRPC_VERBOSITY` and `GRPC_TRACE` environment variables that can be used to increase the amount of information
|
||
|
|
that gets printed to stderr.
|
||
|
|
|
||
|
|
## GRPC_VERBOSITY
|
||
|
|
|
||
|
|
`GRPC_VERBOSITY` is used to set the minimum level of log messages printed by gRPC (supported values are `DEBUG`, `INFO` and `ERROR`). If this environment variable is unset, only `ERROR` logs will be printed.
|
||
|
|
|
||
|
|
## GRPC_TRACE
|
||
|
|
|
||
|
|
`GRPC_TRACE` can be used to enable extra logging for some internal gRPC components. Enabling the right traces can be invaluable
|
||
|
|
for diagnosing for what is going wrong when things aren't working as intended. Possible values for `GRPC_TRACE` are listed in [Environment Variables Overview](doc/environment_variables.md).
|
||
|
|
Multiple traces can be enable at once (use comma as separator).
|
||
|
|
|
||
|
|
```
|
||
|
|
# Enable debug logs for an application
|
||
|
|
GRPC_VERBOSITY=debug ./helloworld_application_using_grpc
|
||
|
|
```
|
||
|
|
|
||
|
|
```
|
||
|
|
# Print information about invocations of low-level C core API.
|
||
|
|
# Note that trace logs of log level DEBUG won't be displayed.
|
||
|
|
# Also note that most tracers user log level INFO, so without setting
|
||
|
|
# GPRC_VERBOSITY accordingly, no traces will be printed.
|
||
|
|
GRPC_VERBOSITY=info GRPC_TRACE=api ./helloworld_application_using_grpc
|
||
|
|
```
|
||
|
|
|
||
|
|
```
|
||
|
|
# Print info from 3 different tracers, including tracing logs with log level DEBUG
|
||
|
|
GRPC_VERBOSITY=debug GRPC_TRACE=tcp,http,api ./helloworld_application_using_grpc
|
||
|
|
```
|
||
|
|
|
||
|
|
Known limitations: `GPRC_TRACE=tcp` is currently not implemented for Windows (you won't see any tcp traces).
|
||
|
|
|
||
|
|
Please note that the `GRPC_TRACE` environment variable has nothing to do with gRPC's "tracing" feature (= tracing RPCs in
|
||
|
|
microservice environment to gain insight about how requests are processed by deployment), it is merely used to enable printing
|
||
|
|
of extra logs.
|