zookeeper与activemq整合

（一）zookeeper与activemq原理

使用ZooKeeper实现的Master-Slave实现方式，是对ActiveMQ进行高可用的一种有效的解决方案，高可用的原理：使用ZooKeeper（集群）注册所有的ActiveMQ Broker。只有其中的一个Broker可以对外提供服务（也就是Master节点），其他的Broker处于待机状态，被视为Slave。如果Master因故障而不能提供服务，则利用ZooKeeper的内部选举机制会从Slave中选举出一个Broker充当Master节点，继续对外提供服务。

（二）环境

• centos版本

  # cat /etc/redhat-release 
  CentOS release 6.5 (Final)

• zookeeper环境

  主机IP                 消息端口        通信端口        节点目录/usr/local/下
  192.168.92.134        2181            2888:3888          zookeeper
  192.168.92.135        2181            2888:3888          zookeeper
  192.168.92.136        2181            2888:3888          zookeeper

• activemq环境

  主机IP                         消息端口      控制台端口          节点目录/usr/local/下
  192.168.92.134                  61616          8161                 activemq
  192.168.92.135                  61616          8161                 activemq
  192.168.92.136                  61616          8161                 activemq

  （3）安装zookeeper

  1）基本配置

  #node1配置：192.168.92.134 
  [ -d /tools ] || mkdir /tools 
  cd /tools
  wget http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.3.6/zookeeper-3.3.6.tar.gz
  tar xf zookeeper-3.3.6.tar.gz -C /usr/local/
  ln -sv /usr/local/zookeeper-3.3.6/ /usr/local/zookeeper
  mkdir  /usr/local/zookeeper/{data,log}
  echo 1 >/usr/local/zookeeper/data/myid
  echo "export PATH=/usr/local/zookeeper/bin:$PATH" >>/etc/profile ; source /etc/profile
  #node2配置：192.168.92.135 
  [ -d /tools ] || mkdir /tools 
  cd /tools
  wget http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.3.6/zookeeper-3.3.6.tar.gz
  tar xf zookeeper-3.3.6.tar.gz -C /usr/local/
  ln -sv /usr/local/zookeeper-3.3.6/ /usr/local/zookeeper
  mkdir  /usr/local/zookeeper/{data,log}
  echo 2 >/usr/local/zookeeper/data/myid
  echo "export PATH=/usr/local/zookeeper/bin:$PATH" >>/etc/profile ; source /etc/profile
  #node3：192.168.92.136
  [ -d /tools ] || mkdir /tools 
  cd /tools
  wget http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.3.6/zookeeper-3.3.6.tar.gz
  tar xf zookeeper-3.3.6.tar.gz -C /usr/local/
  ln -sv /usr/local/zookeeper-3.3.6/ /usr/local/zookeeper
  mkdir  /usr/local/zookeeper/{data,log}
  echo 3 >/usr/local/zookeeper/data/myid
  echo "export PATH=/usr/local/zookeeper/bin:$PATH" >>/etc/profile ; source /etc/profile

  2）修改配置文件：三台节点的配置相同

  cd /usr/local/zookeeper/conf
  cp zoo_sample.cfg zoo.cfg

  #vim zoo.cfg
  clientPort=2181
  server.1=192.168.92.134:2888:3888 
  server.2=192.168.92.135:2888:3888 
  server.3=192.168.92.136:2888:3888 
  dataDir=/usr/local/zookeeper/data
  dataLogDir=/usr/local/zookeeper/log

  3）三台节点启动zookeeper

  zkServer.sh start
  ss -anltup | grep 2181

  ```

  zkServer.sh status

  JMX enabled by default
  Using config: /usr/local/zookeeper-3.3.6/bin/../conf/zoo.cfg
  Mode: follower

zkServer.sh status
JMX enabled by default
Using config: /usr/local/zookeeper-3.3.6/bin/../conf/zoo.cfg
Mode: leader
```