[大数据]自学四、安装zookeeper

1、新建目录

mkdir /install/zookeeper

2、下载安装包(可自行查找并下载)? ?

wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/current/apache-zookeeper-3.7.0-bin.tar.gz

3、解压(版本不一样，文件名可能也不一样)

tar -zxvf apache-zookeeper-3.7.0-bin.tar.gz 

4、拷贝默认配置文件

[root@localhost apache-zookeeper-3.7.0-bin]# cd conf
[root@localhost conf]# ls
configuration.xsl  log4j.properties  zoo.cfg  zoo_sample.cfg
[root@localhost conf]# cp zoo_sample.cfg zoo.cfg 

5、启动zookeeper

[root@localhost apache-zookeeper-3.7.0-bin]# ls
bin  conf  docs  lib  LICENSE.txt  logs  NOTICE.txt  README.md  README_packaging.md
[root@localhost apache-zookeeper-3.7.0-bin]# bin/zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /install/zookeeper/apache-zookeeper-3.7.0-bin/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@localhost apache-zookeeper-3.7.0-bin]# 

这样zookeeper就能启动起来了

zookeeper基本配置文件如下：

[root@localhost apache-zookeeper-3.7.0-bin]# more conf/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=/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

## Metrics Providers
#
# https://prometheus.io Metrics Exporter
#metricsProvider.className=org.apache.zookeeper.metrics.prometheus.PrometheusMetricsProvider
#metricsProvider.httpPort=7000
#metricsProvider.exportJvmInfo=true

[root@localhost apache-zookeeper-3.7.0-bin]# 

其中：

tickTime=2000? ? ? ? #zookeeper时间配置中的基本单位(毫秒)

initLimit=10? ? ? ? #允许follower初始化连接到leader的最大时长，时长为 initLimit *?tickTime，默认为2000 * 10 = 20000 -> 20秒

syncLimit=5? ? ? ? #允许follower与? leader数据同步最大时长，默认5 * 2000 =10000 -> 10秒

dataDir=/tmp/zookeeper? ? ? ? #zookeeper数据存储目录，建议自定义目录

clientPort=2181? ? ? ? #zookeeper对客户端提供的产端口号

maxClientCnxns=60? ? ? ? #单个客户端与zookeeper最大并发连接数

autopurge.snapRetainCount=3? ? ? ? #保存的数据快照数量，超过上限，其他的会被清除

autopurge.purgeInterval=1? ? ? ? #自动触发清除任务时间间隔，小时为单位。默认为0，表示不清除