MQTT Load Generator

A very simple MQTT load generator tool written in Go. The tool will first establish all the connections to the target broker and only then start the publishing of messages.

A simple checker that counts received messages is also provided.

Requirements

• Go 1.19.1+ (probably works with older versions too!)

Build

• ./build_all.sh will generate the binaries
  • cmd/load_generator/mqtt-load-generator
  • cmd/checker/checker

Run

• ./cmd/load_generator/mqtt-load-generator --help will show all the supported options for the load generator
• ./cmd/checker/checker --help will show all the supported options for the checker

Example to publish 1000 messages with 1KB payload size with a 1 ms wait between messages using 100 concurrent clients

./cmd/load_generator/mqtt-load-generator  -c 1000 -s 1000 -t /golang/pub -i 1 -n 100 -u secret -P mega_secret -h localhost -p 1883

To count incoming messages you can use the checker

./cmd/checker/checker -h localhost -p 1883 -u secret -P ultra_secret -t /golang/pub

To check all the available options run

./cmd/load_generator/mqtt-load-generator --help

Docker image

To create a docker image for the load generator:

docker build -t mqtt-load-generator .

Running the load generator

To run a docker container from it reuse the same command line like above with:

docker run --rm -it mqtt-load-generator -c 1000 -s 1000 -t /golang/pub -i 1 -n 100 -u secret -P mega_secret -h localhost -p 1883 

Running the checker

docker run --entrypoint /checker --rm -it mqtt-load-generator -t /golang/pub -u secret -P mega_secret -h localhost -p 1883 

Run on Kubernetes

Here are a few methods of running the image in a Kubernetes cluster (e.g., to creating the load nearer to cluster resources by using cluster-local addresses):

Running the load generator

kubectl run mqtt-load-generator --image=ghcr.io/pablitovicente/mqtt-load-generator:v1.0.7  \
  -- -h <mqtt-broker-address> -p 1883 -u secret -P mega_secret \
     -c 1000 -s 1000 -t /golang/pub -i 1 -n 100

Running the load checker

kubectl run mqtt-load-checker --image=ghcr.io/pablitovicente/mqtt-load-generator:v1.0.7 --command \
  -- /checker -h <mqtt-broker-address> -p 1883 -u secret -P mega_secret \
      -t /golang/pub --disable-bar

Running the load generator as a Kubernetes Job

To run as a Kubernetes job you can adjust the file k8s/job.yaml and apply it with:

kubectl create -f k8s/job.yaml

To view the log output use:

kubectl logs -f -l job-name=mqtt-load-generator

To restart when one run is finished you can use:

kubectl delete jobs.batch -l app=mqtt-load-generator ; kubectl create -f k8s/job.yaml

Run multiple jobs parallel

To run multiple jobs in parallel you adjust parameter spec.parallelism in k8s/job.yaml

Delete multiple jobs

To clean up all mqtt-load-generator jobs you can run:

kubectl delete jobs.batch -l app=mqtt-load-generator

Running the load checker as Kubernetes Deployment

kubectl create -f k8s/checker-deployment.yaml

TODO

• Use more idiomatic Go style
• Support TLS Added
• Support mTlS Added
• Improve error handling
• Add tests (this should be first :P)

Contributors