基础数据仓库环境搭建(三)Zookeeper的安装与配置和操作

Zookeeper概述

Zookeeper 是一个开源的分布式的，为分布式应用提供协调服务的 Apache 项目。它包含一个简单的原语集，分布式应用程序可以基于它实现同步服务，配置维护和命名服务等

工作机制

领导者（leader），负责进行投票的发起和决议，更新系统状态
学习者（learner），包括跟随者（follower）和观察者（observer），follower用于接受客户端请求并给客户端返回结果，在选主过程中参与投票 Observer可以接受客户端连接，将写请求转发给leader，但observer不参加投票过程，只同步leader的状态，observer的目的是为了扩展系统，提高读取速度
客户端（client），请求发起方

zookeeper的应用场景

统一命名服务、统一的配置管理、统一集群管理、服务器节点动态上下线、软负载均衡等

Zookeeper的下载与安装

我是在我的三台结点上方都安装了Zookeeper

链接：https://pan.baidu.com/s/1h9EPReCFmNtH9lRsi4NGRg

提取码：8520

配置安装

[root@node01 Zookeeper]# tar -zxvf apache-zookeeper-3.5.5-bin.tar.gz
文件夹重命名
[root@node01 Zookeeper]#

mv apache-zookeeper-3.5.5-bin zookeeper-3.5.5

编辑一下conf下的zoo.sample.cfg
[root@node01 Zookeeper]#

 cd zookeeper-3.5.5

[root@node01 zookeeper-3.5.5]#

 cd conf

[root@node01 conf]#

 mv zoo_sample.cfg zoo.cfg

[root@node01 conf]#

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.
dataDir=/opt/apps/zookeeper-3.5.7/data
# 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
#######################cluster##########################
server.1=node04:2888:3888
server.2=node02:2888:3888
server.3=node03:2888:3888

创建data文件夹,在文件夹下新建文件写入id号

[root@node01 Zookeeper]#

mkdir data
cd  data/
vim myid

写入id数字即可

修改环境变量

[root@node01 Zookeeper]# vi /etc/profile

#Zookeeper配置

export ZOOKEEPER_HOME=/opt/apps/zookeeper-3.5.7
export PATH=$PATH:$ZOOKEEPER_HOME/bin

使环境变量生效
[root@node01 Zookeeper]#

source /etc/profile

简单操作

启动zookeeper服务
[root@node01 Zookeeper]# zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /opt/SoftWare/Zookeeper/zookeeper-3.5.5/bin/…/conf/zoo.cfg
Starting zookeeper … STARTED

查看进程
[root@node01 Zookeeper]# jps
1777 ResourceManager
9987 QuorumPeerMain
1413 NameNode
10006 Jps
1614 SecondaryNameNode
#查看服务状态
[root@node01 Zookeeper]# zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/SoftWare/Zookeeper/zookeeper-3.5.5/bin/…/conf/zoo.cfg
Mode: standalone
启动客户端
[root@node01 Zookeeper]# zkCli.sh
#退出客户端
[zk: localhost:2181(CONNECTED) 1] quit
停止zookeeper服务器端
[root@node01 Zookeeper]# zkServer.sh stop