目录
一、安装准备
一、安装准备
下载地址：https://www.apache.org/dyn/closer.cgi/zookeeper/
官方文档：https://zookeeper.apache.org/doc/r3.4.5/
这里一共安装三台机器，分别是 hadoop001、hadoop002、hadoop003
二、zookeeper安装
1、解压文件
cd /usr/local/hadoop
tar zxpf zookeeper-3.4.5.tar.gz -C /usr/local/hadoop
2、创建软连接
ln -s zookeeper-3.4.5 zookeeper
三、zookeeper配置
1、配置zoo.cfg
vim /usr/local/hadoop/zookeeper/conf/zoo.cfg
zoo.cfg配置内容如下
# 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/local/hadoop/zookeeper/data
dataLogDir=/usr/local/hadoop/zookeeper/logs
# the port at which the clients will connect
clientPort=2181
#
# 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=hadoop001:2888:3888
server.2=hadoop002:2888:3888
server.3=hadoop003:2888:3888
配置文件说明
tickTime：心跳时间，默认2000毫秒即2秒
initLimit：初始化时follower和leader之间的最多心跳数
syncLimit：follower和leader之间请求响应的最多心跳数
dataDir：存放myid、版本信息和数据持久化的目录
dataLogDir：zookeeper存放日志的目录
clientPort：zookeeper监听的端口，默认2181
server.N=ip:2888:3888：server节点配置，N表示第N台zk的节点
2、配置myid
zookeeper根据配置文件自动创建dataDir、dataLogDir目录，需要自己手动创建
mkdir /usr/local/hadoop/zookeeper/data
mkdir /usr/local/hadoop/zookeeper/logs
给每台zk节点配置myid，每个节点myid的值和zoo.cfg中的server.N一致
echo "1" > /usr/local/hadoop/zookeeper/data/myid
echo "2" > /usr/local/hadoop/zookeeper/data/myid
echo "3" > /usr/local/hadoop/zookeeper/data/myid
cat /usr/local/hadoop/zookeeper/data/myid
zookeeper的选举机制和myid密切关联，myid值大的相对更容易成为leader，具体这里就不详细讨论了。
如不配置myid，会在 zookeeper.out 文件中抛出错误
[myid:] - ERROR [main:QuorumPeerMain@85] - Invalid config, exiting abnormally
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException: Error processing /usr/local/hadoop/zookeeper/bin/../conf/zoo.cfg
四、配置环境变量
vim /etc/profile
export ZOO_HOME=/usr/local/hadoop/zookeeper
export PATH=$PATH:$ZOO_HOME/bin
五、启动zookeeper
zkServer.sh start
zkServer.sh status
这里第二个节点选举成了leader
