Zookeeper学习（1）：安装

zookeeper是通过java开发的，所以的运行需要依赖JAVA环境，安装zookeeper之前，先安装JDK。

一、安装JDK

1. 下载JDK，由于Zookeeper的运行需要依赖jdk1.8以上版本，所以我们下载jdk1.8+就可以了。

wget https://repo.huaweicloud.com/java/jdk/8u181-b13/jdk-8u181-linux-x64.tar.gz

2. 解压

tar -zxvf jdk-8u181-linux-x64.tar.gz

3. 由于我们本次的实验都是在/data下完成，所以将jdk文件夹移动到/data下。

mv jdk1.8.0_181/ /data

4. 设置环境变量

vi /etc/profile.d/java.sh

# set java env
export JAVA_HOME=/data/jdk1.8.0_181
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH

# reload env
source /etc/profile　

5. 测试是否安装成功

java -version
# 显示版本
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)

二、安装Zookeeper

1. 下载Zookeeper，最新稳定版本是3.6.3

wget https://archive.apache.org/dist/zookeeper/stable/apache-zookeeper-3.6.3-bin.tar.gz

2. 解压

tar -zxvf apache-zookeeper-3.6.3-bin.tar.gz 

3. 移动到/data

mv apache-zookeeper-3.6.3-bin /data/zookeeper

4. 设置环境变量

vi /etc/profile.d/zookeeper.sh

# set zookeeper env
export ZOOKEEPER_HOME="/data/zookeeper" 
export PATH="$ZOOKEEPER_HOME/bin:$PATH"

# 设置完成后重加载环境变量
source /etc/profile

5. 设置Zookeeper配置文件

1. Zookeeper目录下有一个试例，复制之后修改就可以了
cp /data/zookeeper/conf/zoo_sample.cfg /data/zookeeper/conf/zoo.cfg

2. 修改配置文件
vi /data/zookeeper/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.
# 下面是数据的存储路径，按需修改
dataDir=/data/zookeeper/data
# the port at which the clients will connect
# 客户端端口，按需修改
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

6. 启动Zookeeper

zkServer.sh start

ZooKeeper JMX enabled by default
Using config: /data/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

# 可以在安装目录下的logs文件夹运行grep命令，查看是否有报错。
grep -E -i "((exception)|(error))" *