CentOS中配置CDH版本的ZooKeeper

三台CentOS：Host0，Host1，Host2

在三台中分别安装zookeeper-server

yum install zookeeper-server -y

修改zookeeper的配置文件（/etc/zookeeper/conf/zoo.cfg）

因为zookeeper集群共有3个节点，所以在配置文件中添加server.0，server.1，server.2

# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements.  See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to You under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License.  You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

maxClientCnxns=50
# 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.
dataDir=/var/lib/zookeeper
# the port at which the clients will connect
clientPort=2181
# the directory where the transaction logs are stored.
dataLogDir=/var/lib/zookeeper
#server
server.0 = Host0:2888:3888
server.1 = Host1:2888:3888
server.2 = Host2:2888:3888

2888:3888是Zookeeper多节点之间的通信端口

2888接收端端口，3888发送端端口

在各个Host中添加myid文件，并修改文件所属用户。

echo "0" > /var/lib/zookeeper/myid
chown zookeeper:zookeeper /var/lib/zookeeper/myid

注意，三个主机的/var/lib/zookeeper/myid文件内容不能相同，且与之间的server.0，server.1，server.2的0，1，2相对应。

初始化zookeeper，并启动zookeeper

service zookeeper-server init
service zookeeper-server start

查看zookeeper节点状态

[root@Host0 ~]# zookeeper-server status
JMX enabled by default
Using config: /etc/zookeeper/conf/zoo.cfg
Mode: follower

[root@Host1 ~]# zookeeper-server status
JMX enabled by default
Using config: /etc/zookeeper/conf/zoo.cfg
Mode: leader

[root@Host2 ~]# zookeeper-server status
JMX enabled by default
Using config: /etc/zookeeper/conf/zoo.cfg
Mode: follower

可得Host1是leader，Host0和Host2是follower