使用Docker搭建ApacheKafka環(huán)境的詳細(xì)過程-魔扣目錄

安裝單個節(jié)點

安裝單節(jié)點Kafka代理需能夠滿足本地開發(fā)需求，我們首先學(xué)習(xí)單節(jié)點安裝。

docker-compose.yml 配置

使用Apache Kafka服務(wù)，首先需要啟動Zookeeper 服務(wù)。這可以通過在docker-compose.yml 文件配置依賴實現(xiàn)，但要確保Zookeeper服務(wù)總是在Kafka服務(wù)之前啟動，反之zookeeper最后停止。

首先創(chuàng)建docker-compose.yml文件，增加兩個服務(wù)：zookeeper和kafka：

version: '2'
services:
  zookeeper:
    image: confluentinc/cp-zookeeper:latest
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000
    ports:
      - 22181:2181
  
  kafka:
    image: confluentinc/cp-kafka:latest
    depends_on:
      - zookeeper
    ports:
      - 29092:29092
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: zookeeper:2181
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092,PLAINTEXT_HOST://localhost:29092
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1

Zookeeper服務(wù)監(jiān)聽2181端口為Kafka提供服務(wù)，但對于運行在本機的客戶端，暴露的端口為22181.
類似的，kafka通過端口29092暴露給主機應(yīng)用，但實際上在容器中的端口9092。有KAFKA_ADVERTISED_LISTENERS屬性來配置。

下面通過使用命令啟動容器、開啟kafka服務(wù)：

$ docker-compose up -d
Creating network "kafka_default" with the default driver
Creating kafka_zookeeper_1 ... done
Creating kafka_kafka_1     ... done

下面通過nc命令嚴(yán)重兩個服務(wù)正在監(jiān)聽各自的端口：

$ nc -z localhost 22181
Connection to localhost port 22181 [tcp/*] succeeded!
$ nc -z localhost 29092
Connection to localhost port 29092 [tcp/*] succeeded!

另外，也可以檢查日志，當(dāng)容器正在運行時驗證kafka服務(wù)是否啟動：

$ docker-compose logs kafka | grep -i started

可以看到Kafka服務(wù)已經(jīng)啟動。

最后可以使用Kafka Tool Gui 工具連接已安裝的Kafka服務(wù)：

使用Docker搭建Apache Kafka環(huán)境的詳細(xì)過程

安裝集群環(huán)境

生產(chǎn)環(huán)境需要更穩(wěn)定的環(huán)境，下面擴展 docker-compose.yml文件創(chuàng)建多節(jié)點集群環(huán)境：

docker-compose.yml配置

集群安裝需要zookeeper和Kafka有多個實例，下面為zookeeper和kafka增加多個服務(wù)：

---
version: '2'
services:
  zookeeper-1:
    image: confluentinc/cp-zookeeper:latest
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000
    ports:
      - 22181:2181

  zookeeper-2:
    image: confluentinc/cp-zookeeper:latest
    environment:
      ZOOKEEPER_CLIENT_PORT: 2181
      ZOOKEEPER_TICK_TIME: 2000
    ports:
      - 32181:2181
  
  kafka-1:
    image: confluentinc/cp-kafka:latest
    depends_on:
      - zookeeper-1
      - zookeeper-2

    ports:
      - 29092:29092
    environment:
      KAFKA_BROKER_ID: 1
      KAFKA_ZOOKEEPER_CONNECT: zookeeper-1:2181,zookeeper-2:2181
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka-1:9092,PLAINTEXT_HOST://localhost:29092
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1
  kafka-2:
    image: confluentinc/cp-kafka:latest
    depends_on:
      - zookeeper-1
      - zookeeper-2
    ports:
      - 39092:39092
    environment:
      KAFKA_BROKER_ID: 2
      KAFKA_ZOOKEEPER_CONNECT: zookeeper-1:2181,zookeeper-2:2181
      KAFKA_ADVERTISED_LISTENERS: PLAINTEXT://kafka-2:9092,PLAINTEXT_HOST://localhost:39092
      KAFKA_LISTENER_SECURITY_PROTOCOL_MAP: PLAINTEXT:PLAINTEXT,PLAINTEXT_HOST:PLAINTEXT
      KAFKA_INTER_BROKER_LISTENER_NAME: PLAINTEXT
      KAFKA_OFFSETS_TOPIC_REPLICATION_FACTOR: 1

必須要確保kafka服務(wù)名稱唯一，通過KAFKA_BROKER_ID 屬性設(shè)置。而且每個服務(wù)必須暴露唯一主機端口。雖然zookeeper-1 和 zookeeper-2 監(jiān)聽2181端口，但對于主機端口分別為 22181 和 32181。類似的，kafka-1 和 kafka-2 services對應(yīng)主機端口分別為 29092 和 39092。

啟動kafka集群

現(xiàn)在通過docker-compose命令啟動集群：

$ docker-compose up -d
Creating network "kafka_default" with the default driver
Creating kafka_zookeeper-1_1 ... done
Creating kafka_zookeeper-2_1 ... done
Creating kafka_kafka-2_1     ... done
Creating kafka_kafka-1_1     ... done

啟動完成，使用Kafka Tool連接集群，地址通過逗號分割只讀多個zookeeper地址和端口：