Skip to content


Repository files navigation


Powerful open-source platform for load testing APIs.

CII Best Practices Join Slack Docker Pulls

Predator manages the entire lifecycle of stress-testing servers, from creating performance tests, to running these tests on a scheduled and on-demand basis, and finally viewing the test results in a highly informative and live report.

It has a simple, one-click installation, built with support for Kubernetes, DC/OS and Docker Engine, and can persist the created performance tests and their reports in 5 different databases. It also supports running distributed load out of the box. Bootstrapped with a user-friendly UI alongside a simple REST API, Predator helps developers simplify the performance testing regime.

Installation   |   Site   |   Documentation   |   API Reference |   API Tests Examples


Distributed Load ❇️ Predator supports an unlimited number of load generators that produce multiple load runners concurrently.
Functional Testing 🆕 Run functional tests with various types of assertions and later on see the results in the report page.
Streaming Integration 🆕 Produce predator resources to Kafka easily and seamlessly.
Rich UI ❇️ Predator offers a rich UI where you can write tests, run them and compare results.
Reports && Tests Persistence ❇️ Predator provides out-of-the box functionality for persisting data in Postgres, MySQL, MSSQL and SQLITE.
Real time reports ❇️ Predator aggregates all concurrent runs into a single beautiful report in real time (latency, rps, status codes and more).
CSV Datasets ❇️ Predator support uploading files like csv to provide dataset for test inputs
Scheduled runs ❇️ Predator can run recurring tests using cron expressions.
REST API ❇️ Full REST API to integrate Predator with CI/CD frameworks
Benchmarks ❇️ Set benchmarks to compare test runs to ensure performance degradation is discovered early in development. Allows to measure every build and release against specified baseline results guaranteeing safer releases to production.
Cloud Native ❇️ Predator is built to take advantage of Kubernetes and DC/OS. It's integrated with those platforms and can manage the load generators lifecycles by itself.
Prometheus/Influx integration ❇️ Predator comes integrated with Prometheus and Influx. Simply configure it through the predator REST API or using the UI.
Compare Multiple tests results ❇️ Built-in dashboard to compare multiple test runs at once.
Webhooks API 🆕 Supported in Slack, Microsoft Teams, Discord or JSON format for an easy server to server integration.

Major Updates Notes

v1.5.0 - Breaking changes

DB Support

  1. Predator's support of Cassandra will be dropped. Before opensourcing Predator and using an ORM abstraction in order to support multiple databases, Predator was only integrated with Cassandra as a backend storage. Since Cassandra's pros are not fully leveraged in the usecases of Predator's integration with a database and because it was delaying our development on new features, we decided to fully drop support of it. We plan to provide migration scripts to our other supported databases.

Jobs API

  1. Functional tests support will break the POST /jobs API. A new parameter type to the create job body will be added and will require either a value of load_test or functional_test, check out our API documentation for more details.
  2. New Webhooks API will break the current webhooks feature implemented in <= v1.4. POST /jobs API will now include in the body webhook_id field instead of webhook_url.

To see the progress of v1.5.0 click here

Quick View

System Overview

Getting Started

Important Deployment Tips

Predator is production ready and fully tested and can be deployed in all of the following platforms listed. Please follow these guidelines when deploying Predator:

  1. Deploy Predator using only tagged releases and not latest.
  2. Predator-Runner docker image version (zooz/predator-runner:$TAGGED_VERSION) must match the Predator's major.minor version running in order to be fully compatible with all features. Patched versions don't have to match, but it is recommended to use latest patch version.
    • For example, Predator version 1.6 (zooz/predator:1.6) should run Predator-Runner version 1.6 as well (zooz/predator-runner:1.6).
  3. For notes on which version to deploy, read our versioning section.


Predator is designed to seamlessly deploy into your Kubernetes cluster. Install Predator from the Helm Hub


Predator is included in Mesosphere Universe. Please refer to for a quick start guide and examples for installing the package.


Without persisted storage:

docker run -d -e JOB_PLATFORM=DOCKER -e INTERNAL_ADDRESS=http://$MACHINE_IP:80/v1 -p 80:80 --name predator -v /var/run/docker.sock:/var/run/docker.sock zooz/predator

With persisted storage:

docker run -d -e SQLITE_STORAGE=db/predator -e JOB_PLATFORM=DOCKER -e INTERNAL_ADDRESS=http://$MACHINE_IP:80/v1 -p 80:80 --name predator -v /var/run/docker.sock:/var/run/docker.sock -v /tmp/predator:/usr/db zooz/predator

where $MACHINE_IP is the local ip address of your machine (not localhost, but actual ip address - it is your local network address).


To run and debug Predator locally run:

npm run setup-local-env

This script will clean your node_modules, run npm install, build the ui (webpack) and set .env file with minimal required params.
After that you will be able to start Predator with:

npm run start-local

In case your IP changes, you will need to change it in .env file.

Developing front-end with hot reload

cd ui
PREDATOR_URL=http://localhost:3000/v1 npm start

Running the tests

npm test

The script runs the following tests:

  • lint
  • unit-tests
  • integration-tests

Opening the Predator UI

The path for accessing the Predator UI is: http://localhost:3000/ui (in the case that Predator is running locally under port 3000)

In case Predator is not running under the root domain, (for example, running under in order to access the UI follow the below steps:

  1. docker build --build-arg BUCKET_PATH=example-path . -t predator
  2. Deploy the tagged docker image to your preferred platform
  3. Access the Predator UI at

In case you host Predator's docs website on a different URL ( for example, Predator runs in a closed network without access to the internet ) you can configure the docs link in the UI using the PREDATOR_DOCS_URL build-arg. if PREDATOR_DOCS_URL was not specified, the default value is

  1. docker build --build-arg PREDATOR_DOCS_URL= . -t predator
  2. Deploy the tagged docker image to your preferred platform
  3. One should be redirected to when clicking the on the docs link in the UI side menu.


Please read for details on our code of conduct, and the process for submitting pull requests to us.


We use SemVer for versioning. For a complete list of Docker images of this project please visit our docker hub repository.

Predator tagged images are maintained in two ways:

  1. MAJOR.MINOR (for example zooz/predator:1.5)
  2. MAJOR.MINOR.PATCH (for example zooz/predator:1.5.4)

Everytime a certain tag MAJOR.MINOR.PATCH is released, the initial MAJOR.MINOR version (of the same major and minor versions) will also be updated with the new patched updates.

Therefore to always stay updated to the latest patched version, use tag convention MAJOR.MINOR, otherwise use tag convention MAJOR.MINOR.PATCH

Built With


For topics that are better discussed live, please join the Predator Slack workspace.


This project is licensed under the Apache License 2.0 - see the file for details