CentOS中配置CDH版本的ZooKeeper

三臺CentOS：Host0，Host1，Host2

在三臺中分別安裝zookeeper-server

yum install zookeeper-server -y

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

由於zookeeper集羣共有3個節點，因此在配置文件中添加server.0，server.1，server.2

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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多節點之間的通訊端口

2888接收端端口，3888發送端端口

在各個Host中添加myid文件，並修改文件所屬用戶。

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

注意，三個主機的/var/lib/zookeeper/myid文件內容不能相同，且與之間的server.0，server.1，server.2的0，1，2相對應。

初始化zookeeper，並啓動zookeeper

service zookeeper-server init
service zookeeper-server start

查看zookeeper節點狀態

[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