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

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maxClientCnxns=
# The number of milliseconds of each tick
tickTime=
# The number of ticks that the initial
# synchronization phase can take
initLimit=
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=
# the directory where the snapshot is stored.
dataDir=/var/lib/zookeeper
# the port at which the clients will connect
clientPort=
# the directory where the transaction logs are stored.
dataLogDir=/var/lib/zookeeper
#server
server. = Host0::
server. = Host1::
server. = Host2::

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 "" > /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