{"id":24353,"date":"2023-04-06T17:32:53","date_gmt":"2023-04-06T15:32:53","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/?p=24353"},"modified":"2024-09-11T10:18:50","modified_gmt":"2024-09-11T08:18:50","slug":"ansible-driven-automation-and-kafka","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/ansible-driven-automation-and-kafka\/","title":{"rendered":"Ansible Driven Automation and Kafka"},"content":{"rendered":"\n

I will add another example of what can be done with Ansible Driven Automation by interfacing it with Kafka. For those who wonder what Event-Driven Ansible is have a look at my previous blog<\/a> about it.<\/p>\n\n\n\n

Additional Installation Steps<\/h2>\n\n\n\n

In my previous blog, I already listed the steps to setup Event Driven Ansible (EDA). To connect to Kafka (I will talk about Kafka installation in next chapter), Ansible has more requirements which are not installed via ansible-galaxy<\/code>, but via pip<\/code>. To do so, simply use the requirements file from the collection:<\/p>\n\n\n

\npip install -r ~\/.ansible\/collections\/ansible_collections\/ansible\/eda\/requirements.txt\n<\/pre><\/div>\n\n\n
If you did not do it, you will face an error message ModuleNotFoundError: No module named 'aiokafka'<\/code>.<\/p>\n\n\n\n
Install Kafka<\/h2>\n\n\n\n
First, we need to download the package:<\/p>\n\n\n
\ncurl -O https:\/\/packages.confluent.io\/archive\/7.3\/confluent-7.3.3.zip\n<\/pre><\/div>\n\n\n
unzip it with unzip confluent-7.3.3.zip<\/code>.<\/p>\n\n\n\n
Once we moved into the extracted directory, we must create a new storage. For that, we will use kafka-storage<\/code> to generate a unique random id:<\/p>\n\n\n
\nKAFKA_CLUSTER_ID="$(bin\/kafka-storage random-uuid)"\n<\/pre><\/div>\n\n\n
And format storage with that ID:<\/p>\n\n\n
\nbin\/kafka-storage format -t $KAFKA_CLUSTER_ID -c etc\/kafka\/kraft\/server.properties\n<\/pre><\/div>\n\n\n
The mentioned properties file is an example provided with the package. I changed two options in that file:<\/p>\n\n\n\n
    \n
  • advertised.listeners to the server IP instead of localhost<\/li>\n\n\n\n
  • log.dirs to a more persitent directory as it was pointing to \/tmp<\/li>\n<\/ul>\n\n\n\n
    Now that storage is ready, we can start Kafka server:<\/p>\n\n\n
    \nbin\/kafka-server-start etc\/kafka\/kraft\/server.properties\n<\/pre><\/div>\n\n\n
    Server will take few seconds to start and will be eventually ready:<\/p>\n\n\n
    \n[2023-04-06 14:14:09,584] INFO [KafkaRaftServer nodeId=1] Kafka Server started (kafka.server.KafkaRaftServer)\n<\/pre><\/div>\n\n\n
    Keep this window open as it is running server.<\/p>\n\n\n\n
    Rule Book<\/h2>\n\n\n\n
    The rule book will look like this:<\/p>\n\n\n
    \n---\n- name: Demo rules with kafka as source\n  hosts: localhost\n  sources:\n    - name: Kafka\n      ansible.eda.kafka:\n        topic: eda\n        host: 192.168.33.20\n        port: 9092\n        group_id: testing\n  rules:\n    - name: Check defined\n      condition: event.i is defined\n      action:\n        debug:\n    - name: Stop\n      condition: event.stop == true\n      action:\n        shutdown:\n<\/pre><\/div>\n\n\n
    And starting it with ansible-rulebook --rulebook kafka-test-rules.yml -i inventory.yml --verbose<\/code>:<\/p>\n\n\n
    \n2023-04-06 14:46:17,311 - ansible_rulebook.app - INFO - Starting sources\n2023-04-06 14:46:17,312 - ansible_rulebook.app - INFO - Starting rules\n2023-04-06 14:46:17,312 - ansible_rulebook.engine - INFO - run_ruleset\n2023-04-06 14:46:18,070 - ansible_rulebook.engine - INFO - ruleset define: {"name": "Demo rules with kafka as source", "hosts": ["localhost"], "sources": [{"EventSource": {"name": "Kafka", "source_name": "ansible.eda.kafka", "source_args": {"topic": "eda", "host": "192.168.33.20", "port": 9092, "group_id": "testing"}, "source_filters": []}}], "rules": [{"Rule": {"name": "Check defined", "condition": {"AllCondition": [{"IsDefinedExpression": {"Event": "i"}}]}, "action": {"Action": {"action": "debug", "action_args": {}}}, "enabled": true}}, {"Rule": {"name": "Stop", "condition": {"AllCondition": [{"EqualsExpression": {"lhs": {"Event": "stop"}, "rhs": {"Boolean": true}}}]}, "action": {"Action": {"action": "shutdown", "action_args": {}}}, "enabled": true}}]}\n2023-04-06 14:46:18,070 - ansible_rulebook.engine - INFO - load source\n2023-04-06 14:46:18,646 - ansible_rulebook.engine - INFO - load source filters\n2023-04-06 14:46:18,650 - ansible_rulebook.engine - INFO - Calling main in ansible.eda.kafka\n2023-04-06 14:46:18,650 - aiokafka.consumer.subscription_state - INFO - Updating subscribed topics to: frozenset({'eda'})\n2023-04-06 14:46:18,654 - ansible_rulebook.engine - INFO - Start a playbook action runner for Demo rules with kafka as source\n2023-04-06 14:46:18,655 - ansible_rulebook.engine - INFO - Waiting for actions on events from Demo rules with kafka as source\n2023-04-06 14:46:18,655 - ansible_rulebook.engine - INFO - Waiting for events from Demo rules with kafka as source\n2023-04-06 14:46:18,709 - aiokafka.consumer.group_coordinator - INFO - Discovered coordinator 1 for group testing\n2023-04-06 14:46:18,711 - aiokafka.consumer.group_coordinator - INFO - Revoking previously assigned partitions set() for group testing\n2023-04-06 14:46:18,711 - aiokafka.consumer.group_coordinator - INFO - (Re-)joining group testing\n2023-04-06 14:46:18,762 - aiokafka.consumer.group_coordinator - INFO - Joined group 'testing' (generation 5) with member_id aiokafka-0.8.0-4497ff79-c442-4cf2-97a2-958708bbdfde\n2023-04-06 14:46:18,762 - aiokafka.consumer.group_coordinator - INFO - Elected group leader -- performing partition assignments using roundrobin\n2023-04-06 14:46:18,794 - aiokafka.consumer.group_coordinator - INFO - Successfully synced group testing with generation 5\n2023-04-06 14:46:18,795 - aiokafka.consumer.group_coordinator - INFO - Setting newly assigned partitions {TopicPartition(topic='eda', partition=0)} for group testing\n<\/pre><\/div>\n\n\n
    Let’s produce few messages to test everything works as expected (finishing with Ctrl+c):<\/p>\n\n\n
    \n~\/confluent-7.3.3$ .\/bin\/kafka-console-producer --bootstrap-server 192.168.33.20:9092 --topic eda\n>TEST1\n>TEST2\n>^Cvagrant@debian11:~\/confluent-7.3.3$\n<\/pre><\/div>\n\n\n
    And consume them:<\/p>\n\n\n
    \n~\/confluent-7.3.3$ .\/bin\/kafka-console-consumer --bootstrap-server 192.168.33.20:9092 --topic eda --from-beginning\nTEST1\nTEST2\n<\/pre><\/div>\n\n\n
    “--from-beginning<\/code>” flag will make consumer read whole topic history.<\/p>\n\n\n\n
    Triggering the Playbook<\/h2>\n\n\n\n
    As in previous blog, messages are in JSON format. The rule book has two rules:<\/p>\n\n\n\n
      \n
    • If JSON has a “i” field, it will display debug information.<\/li>\n\n\n\n
    • If it has a “stop” field set to true, it will stop the rule book.<\/li>\n<\/ul>\n\n\n\n
      Let’s git it a try:<\/p>\n\n\n\n
      In the producer prompt (i.e. ><\/code>), I enter {“i”:””}, the following will be displayed in the ansible-rulebook:<\/p>\n\n\n
      \n2023-04-06 15:15:06 855 [main] INFO org.drools.ansible.rulebook.integration.api.rulesengine.RegisterOnlyAgendaFilter - Activation of effective rule "Check defined" with facts: [Event DROOLS_PROTOTYPE with values = {i=}]\n2023-04-06 15:15:06,856 - ansible_rulebook.rule_generator - INFO - calling Check defined\n2023-04-06 15:15:06,857 - ansible_rulebook.engine - INFO - call_action debug\n2023-04-06 15:15:06,857 - ansible_rulebook.engine - INFO - substitute_variables [{}] [{'event': {'i': ''}, 'fact': {'i': ''}}]\n2023-04-06 15:15:06,857 - ansible_rulebook.engine - INFO - action args: {}\n======================================================================================================================================================================================================\nkwargs:\n{'facts': {},\n 'hosts': ['localhost'],\n 'inventory': {'all': {'hosts': {'localhost': {'ansible_connection': 'local'}}}},\n 'project_data_file': None,\n 'ruleset': 'Demo rules with kafka as source',\n 'source_rule_name': 'Check defined',\n 'source_ruleset_name': 'Demo rules with kafka as source',\n 'variables': {'event': {'i': ''}, 'fact': {'i': ''}}}\n======================================================================================================================================================================================================\n<\/pre><\/div>\n\n\n
      Next message could be {\"stop\":true}<\/code> and associated output of ansible-rulebook:<\/p>\n\n\n
      \n2023-04-06 15:17:43 398 [main] INFO org.drools.ansible.rulebook.integration.api.rulesengine.RegisterOnlyAgendaFilter - &lt;strong&gt;Activation of effective rule "Stop"&lt;\/strong&gt; with facts: [Event DROOLS_PROTOTYPE with values = {stop=true}]\n2023-04-06 15:17:43,419 - ansible_rulebook.rule_generator - INFO - calling Stop\n2023-04-06 15:17:43,421 - ansible_rulebook.engine - INFO - call_action shutdown\n2023-04-06 15:17:43,422 - ansible_rulebook.engine - INFO - substitute_variables [{}] [{'event': {'stop': True}, 'fact': {'stop': True}}]\n2023-04-06 15:17:43,422 - ansible_rulebook.engine - INFO - action args: {}\n2023-04-06 15:17:43,437 - ansible_rulebook.engine - INFO - Attempt to stop ruleset Demo rules with kafka as source\n2023-04-06 15:17:43,438 - ansible_rulebook.engine - INFO - Playbook action runner Demo rules with kafka as source exits\n2023-04-06 15:17:43,439 - ansible_rulebook.engine - INFO - Stopped waiting for actions on events from Demo rules with kafka as source\n2023-04-06 15:17:43,441 - ansible_rulebook.engine - INFO - Stopped waiting on events from Demo rules with kafka as source\n2023-04-06 15:17:43,442 - ansible_rulebook.engine - INFO - Canceling all ruleset tasks\n2023-04-06 15:17:43,444 - ansible_rulebook.app - INFO - Cancelling event source tasks\n2023-04-06 15:17:43,447 - root - INFO - Stopping kafka consumer\n2023-04-06 15:17:43,464 - aiokafka.consumer.group_coordinator - INFO - LeaveGroup request succeeded\n2023-04-06 15:17:43,467 - ansible_rulebook.engine - INFO - Task cancelled\n2023-04-06 15:17:43,468 - ansible_rulebook.app - INFO - Main complete\n<\/pre><\/div>\n\n\n
      Certainly, it is not possible to reverse this action remotely as the service is stopped \ud83d\ude09 .<\/p>\n\n\n\n
      If you have any idea or suggestion on possible scenario I could test, feel free to leave a comment.<\/p>\n","protected":false},"excerpt":{"rendered":"
      I will add another example of what can be done with Ansible Driven Automation by interfacing it with Kafka. For those who wonder what Event-Driven Ansible is have a look at my previous blog about it. Additional Installation Steps In my previous blog, I already listed the steps to setup Event Driven Ansible (EDA). To […]<\/p>\n","protected":false},"author":40,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[197,1320],"tags":[150,708,1103],"type_dbi":[],"class_list":["post-24353","post","type-post","status-publish","format-standard","hentry","category-application-integration-middleware","category-devops","tag-ansible","tag-automation","tag-kafka"],"acf":[],"yoast_head":"\nAnsible Driven Automation and Kafka - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/ansible-driven-automation-and-kafka\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ansible Driven Automation and Kafka\" \/>\n<meta property=\"og:description\" content=\"I will add another example of what can be done with Ansible Driven Automation by interfacing it with Kafka. 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