zookeeper安装

Posted 2021-01-03 gh-123

一。介绍

　　1. zookeeper 是一个分布式协调服务，就是为用户的分布式应用程序提供协调服务。

　　2. zookeeper 是为别的分布式程序服务的。

　　3. zookeeper 本身就是一个分布式程序（只要有半数以上节点存活，就能正常工作）

　　4. zookeeper 所提供的服务包括：主从协调，服务节点动态上下线，统一配置管理，分布式共享锁，统一名称服务等。

　　5. zookeeper 在底层只提供了两个功能：管理（存储，读取）用户提交的数据并为用户程序提供数据节点监听服务。

二。安装

　　1. 官网下载地址：http://hadoop.apache.org/

[[email protected] ~]# wget http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.4.13/zookeeper-3.4.13.tar.gz

　　2. 解压文件

[[email protected] ~]# tar -xvf zookeeper-3.4.13.tar.gz

　　3.  删除运行不相关的文件

[[email protected] zookeeper-3.4.13]# rm -rf src/ *.xml *.txt dist-maven/ docs/

 三。配置

　　1. 进入conf文件夹

[[email protected] zookeeper-3.4.13]# cd conf/
[[email protected] conf]#

　　2. 使配置生效（名字为 zoo.cfg 才生效）

[[email protected] conf]# cp zoo_sample.cfg zoo.cfg 
[[email protected] conf]#

　　3. 配置zoo.cfg

[[email protected] conf]# cat zoo.cfg 
# The number of milliseconds of each tick
# 心跳周期为2000毫秒
tickTime=2000
# The number of ticks that the initial 
# synchronization phase can take
# 初始化的心跳数
initLimit=10
# The number of ticks that can pass between 
# sending a request and getting an acknowledgement
# 请求与回应的最大心跳个数，超过还没回应则请求失败
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
# 数据目录
dataDir=/root/zkData
# the port at which the clients will connect
# 客户端连接端口
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
# 默认端口 2888为主从通信端口 3888为投票选举端口
# 要在对应主机的数据目录（dataDir /root/zkData）创建名为myid的文件，里面为server.的id号
server.1=host1:2888:3888
server.2=host2:2888:3888
server.3=host3:2888:3888
[[email protected] conf]# 

 

　　4. 在数据目录创建myid

[[email protected] conf]# mkdir /root/zkData
[[email protected] conf]# cd /root/zkData/
[[email protected] zkData]# echo 1 > myid
[[email protected] zkData]# ll
总用量 4
-rw-r--r-- 1 root root 2 9月   1 17:55 myid
[[email protected] zkData]# cat myid 
1
[[email protected] zkData]#

　　5. 拷贝zookeeper-3.4.13到其他两台

[[email protected] ~]# scp -r zookeeper-3.4.13 [email protected]:/root

[[email protected] ~]# scp -r zookeeper-3.4.13 host3:/root

　　6. 创建 host2 主机的myid

[[email protected] ~]# mkdir /root/zkData
[[email protected] ~]# cd /root/zkData/
[[email protected] zkData]# echo 2 > myid
[[email protected] zkData]# ll
总用量 4
-rw-r--r-- 1 root root 2 9月   2 02:50 myid
[[email protected] zkData]# cat myid 
2
[[email protected] zkData]#

　　7.  创建 host3 主机的myid

[[email protected] ~]# mkdir /root/zkData
[[email protected] ~]# cd /root/zkData/
[[email protected] zkData]# echo 3 > myid
[[email protected] zkData]# ll
总用量 4
-rw-r--r-- 1 root root 2 9月   2 02:52 myid
[[email protected] zkData]# cat myid 
3
[[email protected] zkData]#

四。启动zookeeper

　　1.  启动第一台（没过半数，不能正常工作）

[[email protected] bin]# ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /root/zookeeper-3.4.13/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[[email protected] bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /root/zookeeper-3.4.13/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.
[[email protected] bin]#

　　2.  启动第二台（刚开始无历史数据启动时，投票给myid大的节点）

[[email protected] bin]# ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /root/zookeeper-3.4.13/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[[email protected] bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /root/zookeeper-3.4.13/bin/../conf/zoo.cfg
Mode: leader
[[email protected] bin]#

　　3.  启动第二台，有主节点了（leader），就直接为从节点（follower）

[[email protected] bin]# ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /root/zookeeper-3.4.13/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[[email protected] bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /root/zookeeper-3.4.13/bin/../conf/zoo.cfg
Mode: follower
[[email protected] bin]#