k8s 中部署kafka集群

由于开发过程中使用到了kafka，又不想自己部署kafka，索性采用k8s 部署kafka集群，以求做到随时插拔。

1. 创建命名空间

apiVersion: v1
kind: Namespace
metadata:
  name: "kafka"
  labels:
    name: "kafka"

sudo kubectl apply -f namespace.yaml

2. 安装Strimzi
   apply the Strimzi install files, which include among other things, the CRDs (CustomerResourceDefinition) to use for declarative management of the Kafka cluster, Kafka topics, and users.

sudo kubectl create -f 'https://strimzi.io/install/latest?namespace=kafka' -n kafka

检查安装

sudo kubectl get pods -n kafka

3. 创建Kafka Cluster

apiVersion: kafka.strimzi.io/v1beta2
kind: Kafka
metadata:
 name: my-cluster
 namespace: kafka
spec:
 kafka:
   version: 3.2.0
   replicas: 1
   listeners:
     - name: plain
       port: 9092
       type: internal
       tls: false
     - name: tls
       port: 9093
       type: internal
       tls: true
     - name: external
       port: 9094
       type: nodeport
       tls: false
   config:
     offsets.topic.replication.factor: 1
     transaction.state.log.replication.factor: 1
     transaction.state.log.min.isr: 1
     default.replication.factor: 1
     min.insync.replicas: 1
     inter.broker.protocol.version: "3.2"
   storage:
     type: ephemeral
 zookeeper:
   replicas: 3
   storage:
     type: ephemeral
 entityOperator:
   topicOperator: {}
   userOperator: {}

注意9094那个端口，我们设置为nodeport 可以外部访问

sudo kubectl create -f kafka.yaml
sudo kubectl get pods -n kafka
sudo kubectl get services -n kafka

kafka集群最重要的服务是my-cluster-kafka-bootstrap service, 这个暴露了9092端口.


此时可以通过32546访问kafka了

4. 使用yaml创建topic

apiVersion: kafka.strimzi.io/v1beta2
kind: KafkaTopic
metadata:
 name: movies
 namespace: kafka
 labels:
   strimzi.io/cluster: my-cluster
spec:
 partitions: 1
 replicas: 1
 config:
   retention.ms: 7200000
   segment.bytes: 1073741824

5. 使用python创建topic

from confluent_kafka.admin import AdminClient, NewTopic



class Topic:
    
    def __init__(self) -> None:
        self.conf = {'bootstrap.servers': f'192.168.214.133:32546'}
        self.admin = AdminClient(self.conf)

    def topicExist(self,topicname):
        topic_metadata = self.admin.list_topics()
        if topic_metadata.topics.get(topicname) is None:
            self.creataTopic(topicname)
  

    def creataTopic(self,topic):
        new_topics = [NewTopic(topic,num_partitions=3, replication_factor=1)]

        fs = self.admin.create_topics(new_topics)

        for topic, f in fs.items():
            try:
                f.result()  # The result itself is None
                print("Topic {} created".format(topic))
                return True
            except Exception as e:
                print("Failed to create topic {}: {}".format(topic, e))
                return False
Topic().creataTopic('ellis1')

6. 查看topic

sudo kubectl get kafkatopic -n kafka

https://www.infoq.com/articles/strimzi-the-gitops-way/

https://strimzi.io/docs/operators/latest/configuring.html

https://strimzi.io/blog/2019/04/23/accessing-kafka-part-2/