集群 配置: 192.168.32.80 192.168.32.81 192.168.32.82 server 1: zjtest7-redis:/opt/zookeeper/conf# cat zoo.cfg | grep -v "^#" tickTime=2000 initLimit=10 syncLimit=5 dataDir=/opt/zookeeper/server1/data dataLogDir=/opt/zookeeper/server1/logs clientPort=2181 server.1=192.168.32.80:2888:3888 server.2=192.168.32.81:2888:3888 server.3=192.168.32.82:2888:3888 server 2: zjtest7-redis2:/opt/zookeeper/conf# cat zoo.cfg | grep -v "^#" tickTime=2000 initLimit=10 syncLimit=5 dataDir=/opt/zookeeper/server2/data dataLogDir=/opt/zookeeper/server2/logs clientPort=2181 server.1=192.168.32.80:2888:3888 server.2=192.168.32.81:2888:3888 server.3=192.168.32.82:2888:3888 server 3: zjtest7-haproxy:/opt/zookeeper/conf# cat zoo.cfg | grep -v "^#" tickTime=2000 initLimit=10 syncLimit=5 dataDir=/opt/zookeeper/server3/data dataLogDir=/opt/zookeeper/server3/logs clientPort=2181 server.1=192.168.32.80:2888:3888 server.2=192.168.32.81:2888:3888 server.3=192.168.32.82:2888:3888 一个zookeeper 集群 只有一个leader： 类似master/slave模式 /**192.168.32.80 follower zjtest7-redis:/opt/zookeeper/conf# telnet 192.168.32.80 2181 Trying 192.168.32.80... Connected to 192.168.32.80. Escape character is '^]'. stat Zookeeper version: 3.4.8--1, built on 02/06/2016 03:18 GMT Clients: /192.168.32.80:54168[0](queued=0,recved=1,sent=0) /127.0.0.1:59950[1](queued=0,recved=23550,sent=23550) Latency min/avg/max: 0/0/111 Received: 25815 Sent: 25814 Connections: 2 Outstanding: 0 Zxid: 0x10000000b Mode: follower Node count: 4 Connection closed by foreign host. /***192.168.32.81 leader zjtest7-redis:/opt/zookeeper/conf# telnet 192.168.32.81 2181 Trying 192.168.32.81... Connected to 192.168.32.81. Escape character is '^]'. stat Zookeeper version: 3.4.8--1, built on 02/06/2016 03:18 GMT Clients: /192.168.32.80:40376[0](queued=0,recved=1,sent=0) Latency min/avg/max: 0/0/0 Received: 2 Sent: 1 Connections: 1 Outstanding: 0 Zxid: 0x10000000b Mode: leader Node count: 4 Connection closed by foreign host. /*******192.168.32.82 zjtest7-redis:/opt/zookeeper/conf# telnet 192.168.32.82 2181 Trying 192.168.32.82... Connected to 192.168.32.82. Escape character is '^]'. stat Zookeeper version: 3.4.8--1, built on 02/06/2016 03:18 GMT Clients: /192.168.32.80:56173[0](queued=0,recved=1,sent=0) Latency min/avg/max: 0/0/0 Received: 2 Sent: 1 Connections: 1 Outstanding: 0 Zxid: 0x10000000b Mode: follower Node count: 4 Connection closed by foreign host. zjtest7-redis:/opt/zookeeper/conf# 客户端提交请求之后,先发送到leader,leader作为接收者,广播到每个server znode ： 节点/NameService/Server1 唯一路径（Node），且携带数据 即是目录又是文件 临时节点,不能有子节点 znode节点变化的时候,可以出发事件 zookeeper 节点:znode 每个watcher 就是服务器集群中的一台机器 zookeeper 应用场景: zk 保存Storm集群的所有数据 Storm集群：Zookeeper作为nimbus（master）和supervisor（slave）的中间枢纽， 保存Storm集群和作业的所有信息，并负责nimbus和supervisor的全部通信， Fast faill 。 Zookeeper 作为master和slave之间唯一的通道, 消息提交到master上，master会把消息发送给zookeeper,zk在分发到每个slave 发布与订阅即所谓的配置管理，顾名思义就是将数据发布到zk节点上，供订阅者动态获取数据， 实现配置信息的集中式管理和动态更新。例如全局的配置信息，地址列表等就非常适合使用。 每天节点自动从zk获取 一个节点是全局唯一的path zk 创建节点: 客户端访问: redis01:/root# cd /zookeeper/server1 redis01:/zookeeper/server1# cd bin/ redis01:/zookeeper/server1/bin# ./zkCli.sh -server localhost:2181 2 ）创建一个新的 znode ，使用 create /zk myData 。这个命令创建了一个新的 znode 节点“ zk ”以及与它关联的字符串： 在leader 上创建: create /zk myData 会自动同步到所有服务器 在folloer上创建:也会同步到leader 一个节点上的数据发生变化后,通知其他节点 watch 监听节点变化 zk集群上相同的znode数据一定是相同的