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