zookeeper 集群搭建

三台机器 ip地址（可以通过修改host指定别名给机器）
10.86.43.164
10.86.43.154
10.93.0.192

三台机器分别执行（建议在home目录下创建对应的目录）

  cd /home/q/
  sudo mkdir zookeeper
  cd  zookeeper/
  sudo wget http://mirrors.hust.edu.cn/apache/zookeeper/zookeeper-3.5.2-alpha/zookeeper-3.5.2-alpha.tar.gz
  sudo tar -xvf zookeeper-3.5.2-alpha.tar.gz
  cd zookeeper-3.5.2-alpha
  cd conf/
  sudo cp zoo_sample.cfg zoo.cfg
  sudo vim zoo.cfg

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.

# the port at which the clients will connect
dataDir=/home/q/zookeeper/data      
dataLogDir=/home/q/zookeeper/logs
# the port at which the clients will connect
clientPort=4180
server.1=10.86.43.164:2888:3888
server.2=10.86.43.154:2888:3888
server.3=10.93.0.192:2888:3888

# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the 
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

可以指定一些参数 clientPort dataDir 等 dataDir 比较重要 指定后需要在对应的目录下创建myid
保存后

cd /home/q/zookeeper/data
vim myid

创建一个myid文件，里面内容为一个数字，用来标识当前主机，conf/zoo.cfg文件中配置的server.X中X为什么数字，则myid文件中就输入这个数字 10.86.43.164 对应的是1

三台机器分别做此操作

然后启动服务

 cd home//q/zookeeper/ zookeeper-3.5.2-alpha/bin/
 sudo zkServer.sh start

第一次启动的日志在 对应目录下的logs里面

/home/q/zookeeper/zookeeper-3.5.2-alpha/logs
tail -f zookeeper-root-server-l-webcall5.support.wap.dev.cn0.out

第一台和第二台启动都会报

java.net.ConnectException: Connection refused
    at java.net.PlainSocketImpl.socketConnect(Native Method)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:579)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:444)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:485)
    at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:513)
    at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:919)
    at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1087)

属于正常现象
继续启动其他两台即可

验证状态

home/q/zookeeper/zookeeper-3.5.2-alpha/bin]$ sudo ./zkServer.sh status 
ZooKeeper JMX enabled by default
Using config: /home/q/zookeeper/zookeeper-3.5.2-alpha/bin/../conf/zoo.cfg
Client port found: 4180. Client address: localhost.
Mode: follower