docker-compose搭建zookeeper集群

搭建zookeeper集群

1. 创建docker-compose.yml文件

   ```
   version: '3.1'
   services:
   zoo1:
   image: zookeeper
   restart: always
   container_name: zoo1
   ports:
   - 2181:2181
   volumes:
   - /usr/local/docker/zookeeper/zoo1/data:/data
   - /usr/local/docker/zookeeper/zoo1/datalog:/datalog
   environment:
   ZOO_MY_ID: 1
   ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
   zoo2:
   image: zookeeper
   restart: always
   container_name: zoo2
   ports:
   - 2182:2181
   volumes:
   - /usr/local/docker/zookeeper/zoo2/data:/data
   - /usr/local/docker/zookeeper/zoo2/datalog:/datalog
   environment:
   ZOO_MY_ID: 2
   ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
   zoo3:
   image: zookeeper
   restart: always
   container_name: zoo3
   ports:
   - 2183:2181
   volumes:
   - /usr/local/docker/zookeeper/zoo3/data:/dada
   - /usr/local/docker/zookeeper/zoo3/datalog:/datalog

   environment:
   ZOO_MY_ID: 3
   ZOO_SERVERS: server.1=zoo1:2888:3888;2181 server.2=zoo2:2888:3888;2181 server.3=zoo3:2888:3888;2181
   ```

2. docker-compose up -d 后台运行

3. docker-compose config 查看配置

4. docker exec -it <容器id> bash 交互式进入容器

5. bin/zkServer.sh status 查看zookeeper集群状态（follower/leader）

java使用zookeeper导入包和配置

1. 导入包

   'org.apache.zookeeper:zookeeper:3.5.6', "org.apache.logging.log4j:log4j:2.12.1", 'org.apache.logging.log4j:log4j-1.2-api:2.12.1', 'org.apache.logging.log4j:log4j-core:2.12.1'

2. 在resources目录下创建 log4j2.properties文件并配置

   ```
   log4j.rootLogger=INFO,stdout
   log4j.appender.stdout=org.apache.log4j.ConsoleAppender
   log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
   log4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%n
   log4j.appender.logfile=org.apache.log4j.FileAppender
   log4j.appender.logfile.File=target/spring.log
   log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
   log4j.appender.logfile.layout.ConversionPattern=%d %p [%c] - %m%n

   ```

3. 代码示例

   ```
   public static void main(String[] args) throws IOException, KeeperException, InterruptedException {
   String connect = "192.168.145.128:2181,192.168.145.128:2182,192.168.145.128:2183";
   int timeout = 30000;
   ZooKeeper zooKeeper = null;
   ZooKeeper finalZooKeeper = zooKeeper;
   zooKeeper = new ZooKeeper(connect, timeout, new Watcher() {
   @Override
   public void process(WatchedEvent event) {

   // System.out.println("start");
   // List children = null;
   // try {
   // children = finalZooKeeper.getChildren("/hhh", true);
   // children.forEach(item -> System.out.println(item));
   // } catch (KeeperException e) {
   // e.printStackTrace();
   // } catch (InterruptedException e) {
   // e.printStackTrace();
   // }
   // System.out.println("end");
   // }

   }
   });

   //必须连接好才能创建目录
   System.out.println(zooKeeper.getState());
   while (true) {
   if (ZooKeeper.States.CONNECTING == zooKeeper.getState()) {
   Thread.sleep(1000);
   } else {
   break;
   }
   }
   System.out.println(zooKeeper.getState());

   // String path = zooKeeper.create("/hhh", "test11".getBytes()
   // , ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
   // System.out.println(path);

   List children = zooKeeper.getChildren("/", true);
   children.forEach(item -> System.out.println(item));
   byte[] data = zooKeeper.getData("/hhh", false, null);
   System.out.println(new String(data));
   ```