ZooKeeper集群搭建

一、环境

    Centos7  64位    JDK1.7.0_80     zookeeper-3.4.10.tar.gz

二、安装

1、通过Xshell上传安装包zookeeper-3.4.10.tar.gz至CentOS7服务器目录：/usr/local/src；

2、在/usr/local/src目录下解压缩安装包zookeeper-3.4.10.tar.gz：

cd /usr/local/src
tar -xzvf zookeeper-3.4.10.tar.gz

3、移动解压缩文件包至/usr/local目录下及重命名：

cd /usr/local/src
cp ./zookeeper-3.4.10.tar.gz /usr/local
cd /usr/local
mv ./zookeeper-3.4.10.tar.gz zookeeper

4、配置zookeeper环境变量

vi /etc/profile

内容：

export ZK_HOME=/usr/local/zookeeper
expoer PATH=$PATH:$ZK_HOME/bin

使环境变量生效：

source /etc/profile

5、zookeeper配置文件：

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

vi zoo.cfg

内容：

# 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.
dataDir=/usr/lib/zookeeper
dataLogDir=/var/log/zookeeper
# the port at which the clients will connect
clientPort=2181
# 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
server.1=slave1:2888:3888
server.2=slave2:2888:3888
server.3=slave3:2888:3888dataDir=/usr/lib/zookeeper
dataLogDir=/var/log/zookeeper
# the port at which the clients will connect
clientPort=2181
# 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
server.1=slave1:2888:3888
server.2=slave2:2888:3888
server.3=slave3:2888:3888

保存退出；

6、配置myid文件：

    进入dataDir目录：

cd /usr/lib/zookeeper
touch ./myid
vi ./myid

slaveX中分别填写1    2    3 ；例如在slave1的myid文件中填写1，保存退出；在slave2的myid文件中填写2，保存退出；在slave3的myid文件中填写3，保存退出；

7、启动集群|关闭集群|查看集群状态：

cd /usr/local/zookeeper/bin
zkServer.sh start; #启动集群
zkServer.sh stop ; #关闭集群
zkServer.sh status; #查看集群状态

Error信息：

1、zookeeper启动时报错：Error contacting service. It is probably not running.

解决方案： 
1、查看liunx系统的防火墙是否关闭，查看防火墙状态 service firewalld status 如果没有关闭，就 servicefirewalld stop 关闭防火墙，然后重新启动zookeeper 看是否启用成功。 
2、查看zookeeper文件目录下conf目录下的文件是否有zoo.cfg和zoo_sample.cfg，若zoo.cfg不存在，请复制zoo_sample.cfg为zoo.cfg，编辑zoo.cfg：

3、查看dataDir=/usr/lib/zookeeper目录下是否存在myid文件，若没有请创建编辑，分别添加1/2/3；

如 server.1=192.168.1.101:2888:3888机器的 myid文件中 填写 1；

    server.2=192.168.1.102:2888:3888机器的 myid文件中 填写 2；

    server.3=192.168.1.103:2888:3888机器的 myid文件中 填写 3；

4、查看日志文件，分析错误原因，针对性的Google、百度解决。