02 | Zookeeper本地安装

第 2 章 Zookeeper 本地安装​

2.1 本地模式安装​

1)安装前准备

1. 安装 JDK

2. 解压改名

bash

# 解压到指定目录
$ tar -zxvf apache-zookeeper-3.5.7-bin.tar.gz -C /opt/module

# 修改名称
$ mv apache-zookeeper-3.5.7-bin zookeeper-3.5.7

2)配置修改

(1)将/opt/module/zookeeper-3.5.7/conf 这个路径下的 zoo_sample.cfg 修改为 zoo.cfg;

bash

$ mv zoo_sample.cfg zoo.cfg

(2)打开 zoo.cfg 文件，修改 dataDir 路径:

bash

$ vim zoo.cfg

修改如下内容:

bash

dataDir=/opt/module/zookeeper-3.5.7/zkData

(3)在/opt/module/zookeeper-3.5.7/这个目录上创建 zkData 文件夹

bash

$ mkdir zkData

3)操作 Zookeeper

(1)启动 Zookeeper

bash

$ bin/zkServer.sh start

(2)查看进程是否启动

bash

$ jps 4020 Jps
4001 QuorumPeerMain

(3)查看状态

bash

$ bin/zkServer.sh status 
ZooKeeper JMX enabled by default
Using config: /opt/module/zookeeper-3.5.7/bin/../conf/zoo.cfg
Mode: standalone

(4)启动客户端

bash

$ bin/zkCli.sh

(5)退出客户端

bash

[zk: localhost:2181(CONNECTED) 0] quit

(6)停止 Zookeeper

bash

$ bin/zkServer.sh stop

2.2 配置参数解读​

zoo_sample.cfg

bash

# 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=/tmp/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

Zookeeper中的配置文件zoo.cfg中参数含义解读如下:

1)tickTime = 2000: 通信心跳时间，Zookeeper服务器与客户端心跳时间，单位毫秒

2)initLimit = 10: LF初始通信时限，Leader和Follower初始连接时能容忍的最多心跳数(tickTime的数量)

3)syncLimit = 5: LF同步通信时限，Leader和Follower之间通信时间如果超过syncLimit * tickTime，Leader认为Follwer死 掉，从服务器列表中删除Follwer。

4)dataDir: 保存Zookeeper中的数据，注意:默认的tmp目录，容易被Linux系统定期删除，所以一般不用默认的tmp目录。

5)clientPort = 2181: 客户端连接端口，通常不做修改。