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Quick Start with Axual

This folder contains a variant of the Quick Start SSL app configured to use a shared test cluster from Axual Platform as the target cluster. You may follow the Getting started on the Axual site to perform the following operations:

  • add a new topic stocks with:
    • string key type
    • JSON value type
    • delete retention policy
    • 1 partition
    • 1 day of retention time
  • add a new application with:
    • ID: stocks-application
    • Name: stocks-application
    • Short name: stocks_app
    • Application type: Java
    • Visibility: Private
  • generate a new authentication credentials and take note of them
  • authorize the application to consume and produce data from/to the stocks topic

The docker-compose.yml file has been revised to realize the integration with Aiven for Apache Kafka as follows:

  • removal of the broker service, because replaced by the remote cluster

  • kafka-connector:

    • definition of new environment variables to configure remote endpoint, credentials, topic name and consumer group in the adapters.xml through the variable-expansion feature of Lightstreamer: 
      ...
environment:
  - bootstrap_server=${bootstrap_server}
  - username=${username}
  - password=${password}
  - group_id=${group_id}
  - topic_mapping=map.${topic}.to
...
    • adaption of adapters.xml to include:

      • new Kafka cluster address retrieved from the environment variable bootstrap_server:

        <param name="bootstrap.servers">$env.bootstrap_server</param>

      • the consumer group retrieved from the environment variable group_id

        <param name="group.id">$env.group_id</param>

      • encryption settings:

        <param name="encryption.enable">true</param>
<param name="encryption.protocol">TLSv1.3</param>
<param name="encryption.hostname.verification.enable">false</param>

      • authentication settings, with the credentials retrieved from environment variables username and password:

        <param name="authentication.enable">true</param>
<param name="authentication.mechanism">SCRAM-SHA-256</param>
<param name="authentication.username">$env.username</param>
<param name="authentication.password">$env.password</param>

      • parameter map.<topic>.to built from env variable topic_mapping, composed from env variable topic

        <param name="$env.topic_mapping">item-template.stock</param>

  • producer:

    • parameter --boostrap-servers retrieved from the environment variable bootstrap_server
    • parameter --topic retrieved from the environment variable topic
    • provisioning of the producer.properties configuration file to enable SASL/SCRAM over TLS, with username and password retrieved from the environment variables username and password:
    # Configure SASL/SCRAM mechanism
sasl.mechanism=SCRAM-SHA-512
# Enable SSL encryption
security.protocol=SASL_SSL
# JAAS configuration
sasl.jaas.config=org.apache.kafka.common.security.scram.ScramLoginModule required username="${username}" password="${password}";

Run

From this directory, run follow the command:

$ bootstrap_server=<bootstrap_server> group_id=<group_id> username=<username> password=<password> topic=<topic> ./start.sh

where:

  • bootstrap_server is the bootstrap server address of the Axual cluster
  • group_id is the consumer group ID
  • username and password are the authentication credentials
  • topic is the name of the topic

Tip

You can get the correct values for bootstrap_server, group_id, and topic by looking at the Cluster connectivity Information of the stocks-application from the Axual Self-service portal.

Then, point your browser to http://localhost:8080/QuickStart.