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# Debugging
Currently, grpc provides two major tools to help user debug issues, which are logging and channelz.
## Logs
gRPC has put substantial logging instruments on critical paths of gRPC to help users debug issues.
The [Log Levels](https://github.com/grpc/grpc-go/blob/master/Documentation/log_levels.md) doc describes
what each log level means in the gRPC context.
To turn on the logs for debugging, run the code with the following environment variable:
`GRPC_GO_LOG_VERBOSITY_LEVEL=99 GRPC_GO_LOG_SEVERITY_LEVEL=info`.
## Channelz
We also provide a runtime debugging tool, Channelz, to help users with live debugging.
See the channelz blog post here ([link](https://grpc.io/blog/a-short-introduction-to-channelz/)) for
details about how to use channelz service to debug live program.
## Try it
The example is able to showcase how logging and channelz can help with debugging. See the channelz
blog post linked above for full explanation.
```
go run server/main.go
```
```
go run client/main.go
```
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