tproxy

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Why I wrote this tool

When I develop backend services and write go-zero, I often need to monitor the network traffic. For example:

1. monitoring gRPC connections, when to connect and when to reconnect
2. monitoring MySQL connection pools, how many connections and figure out the lifetime policy
3. monitoring any TCP connections on the fly

Installation

$ go install github.com/kevwan/tproxy@latest

Or use docker images:

$ docker run --rm -it -p <listen-port>:<listen-port> -p <remote-port>:<remote-port> kevinwan/tproxy:v1 tproxy -l 0.0.0.0 -p <listen-port> -r host.docker.internal:<remote-port>

For arm64:

$ docker run --rm -it -p <listen-port>:<listen-port> -p <remote-port>:<remote-port> kevinwan/tproxy:v1-arm64 tproxy -l 0.0.0.0 -p <listen-port> -r host.docker.internal:<remote-port>

On Windows, you can use scoop:

$ scoop install tproxy

Usages

$ tproxy --help
Usage of tproxy:
  -d duration
    	the delay to relay packets
  -l string
    	Local address to listen on (default "localhost")
  -p int
    	Local port to listen on, default to pick a random port
  -q	Quiet mode, only prints connection open/close and stats, default false
  -r string
    	Remote address (host:port) to connect
  -s	Enable statistics
  -t string
    	The type of protocol, currently support grpc

Examples

Monitor gRPC connections

$ tproxy -p 8088 -r localhost:8081 -t grpc -d 100ms

• listen on localhost and port 8088
• redirect the traffic to localhost:8081
• protocol type to be gRPC
• delay 100ms for each packets

Monitor MySQL connections

$ tproxy -p 3307 -r localhost:3306

Check the connection reliability (Retrans rate and RTT)

$ tproxy -p 3307 -r remotehost:3306 -s -q

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