Demo code used in this talk. Go here to know more about Zeebe.

Contents

• docker-compose.yml: docker configuration for
  • zeebe cluster with 3 brokers and 1 gateway
  • grafana and prometheus for monitoring
  • client application for generating work
• client-app:
  • starter : A java application that sends create workflow instance request at a fixed rate to the zeebe cluster.
  • worker: A java application that activates and completes jobs

Prerequisites

• docker and docker-compose
• Java (to build the client application)

Steps:

• Start brokers and gateway
  docker-compose up -d zeebe-0 zeebe-1 zeebe-2 gateway

• To execute the client application:

  • Build client application in client-app/
mvn install
  • Start the clients
    docker-compose up -d starter worker
  • Alternatively, run the client applications locally
    java -jar client-app/targer/starter.jar

• Start grafana
  docker-compose up -d prometheus grafana

• Open grafana localhost:3000

  • login with admin:pass
  • Open dashboard Zeebe
  • After you started the client applications, you can see if workflow instances are being created and completed in the dashboard. Wait for a minute, if you don't see anything immediately.

• Check Zeebe cluster status
  docker-compose exec gateway zbctl status
  Or, if you have zbctl locally
  zbctl status
  The result will look similar to the following.

Cluster size: 3
Partitions count: 2
Replication factor: 3
Brokers:
  Broker 0 - 172.31.0.2:26501
    Partition 1 : Leader
    Partition 2 : Follower
  Broker 1 - 172.31.0.3:26501
    Partition 1 : Follower
    Partition 2 : Follower
  Broker 2 - 172.31.0.4:26501
    Partition 1 : Follower
    Partition 2 : Leader

• To stop a broker
  docker-compose stop zeebe-2

• Restart the stopped broker by
  docker-compose start zeebe-2

• Clean everything by docker-compose down -v