Ububtu18.04安装Zookeeper3.5.7

Ububtu18.04安装Zookeeper3.5.7

Zookeeper安装

这里采用的ubuntu18.04环境的基本配置为：

hostname 为master
用户名为hadoop
静态IP为 192.168.33.130
网关为 192.168.33.2
防火墙已经关闭
/etc/hosts已经配置

standlone模式安装

全版本下载地址：
https://archive.apache.org/dist/zookeeper/
这里我选择3.5.7这个版本
https://archive.apache.org/dist/zookeeper/zookeeper-3.5.7/

下载到本地后，将apache-zookeeper-3.5.7-bin.tar.gz上传到ubuntu18.04的/home/hadoop/opt/app目录下，
该目录下的目录作用如下：

bin目录 框架启动停止，客户端和服务端的
conf 配置文件信息
docs文档
lib 配置文档的依赖

然后执行

hadoop@master:~$ cd /home/hadoop/opt/app/
hadoop@master:~/opt/app$ tar -zxf apache-zookeeper-3.5.7-bin.tar.gz # 解压缩
hadoop@master:~/opt/app$ ln -s apache-zookeeper-3.5.7-bin zookeeper # 软连接

查看当前目录结构：

hadoop@master:~/opt/app$ pwd # 查看当前目录
/home/hadoop/opt/app
hadoop@master:~/opt/app$ ll
总用量 9120
drwxrwxr-x  6 hadoop hadoop    4096 11月 12 10:42 ./
drwxrwxr-x  3 hadoop hadoop    4096 11月  4 14:53 ../
drwxrwxr-x  6 hadoop hadoop    4096 11月 12 10:41 apache-zookeeper-3.5.7-bin/
-rw-rw-r--  1 hadoop hadoop 9311744 11月 12 10:39 apache-zookeeper-3.5.7-bin.tar.gz

切换到~/opt/app/zookeeper，配置zookeeper的数据存储-data1目录

hadoop@master:~/opt/app$ cd zookeeper # 切换到zookeeper中
hadoop@master:~/opt/app/zookeeper$ ls
bin  conf  docs  lib  LICENSE.txt  NOTICE.txt  README.md  README_packaging.txt
hadoop@master:~/opt/app/zookeeper$ mkdir data0 # 创建data0
hadoop@master:~/opt/app/zookeeper$ ls
bin  conf  data0  docs  lib  LICENSE.txt  NOTICE.txt  README.md  README_packaging.txt

进入~/opt/app/zookeeper/conf目录下，编辑zoo.cfg

hadoop@master:~/opt/app/zookeeper$ cd conf/
hadoop@master:~/opt/app/zookeeper/conf$ ls
configuration.xsl  log4j.properties  zoo_sample.cfg
hadoop@master:~/opt/app/zookeeper/conf$ cp zoo_sample.cfg zoo.cfg #复制zoo.cfg
    
    
hadoop@master:~/opt/app/zookeeper/conf$ vi zoo.cfg # 编辑zoo.cfg文件，编辑内容如下：
# dataDir=/tmp/zookeeper 注释掉这句默认配置，然后添加下面的配置
dataDir=/home/hadoop/opt/app/zookeeper/data0

配置环境变量

hadoop@master:~/opt/app/zookeeper/conf$ vi ~/.bashrc
#这一步会打开bashrc文件，编辑内容如下：
export ZOOKEEPER_HOME=/home/hadoop/opt/app/zookeeper
export PATH=$ZOOKEEPER_HOME/bin:$PATH

hadoop@master:~/opt/app/zookeeper/conf$ source ~/.bashrc # 生效环境变量

启动zk服务端(单机版本)

hadoop@master:~/opt/app/zookeeper/conf$ zkServer.sh status #查看zk启动状态
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Error contacting service. It is probably not running.

hadoop@master:~/opt/app/zookeeper/conf$ zkServer.sh start #启动zkServer
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

hadoop@master:~/opt/app/zookeeper/conf$ zkServer.sh status #查看zk启动状态，单机启动为standalone模式
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: standalone

启动zk客户端

hadoop@master:~/opt/app/zookeeper/conf$ zkCli.sh #启动zkCli，默认连接端口2181
Connecting to localhost:2181
...
...
...
WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 1] help
ZooKeeper -server host:port cmd args
        addauth scheme auth
        close
        config [-c] [-w] [-s]
        connect host:port
        create [-s] [-e] [-c] [-t ttl] path [data] [acl]
        delete [-v version] path
        deleteall path
        delquota [-n|-b] path
        get [-s] [-w] path
        getAcl [-s] path
        history
        listquota path
        ls [-s] [-w] [-R] path
        ls2 path [watch]
        printwatches on|off
        quit
        reconfig [-s] [-v version] [[-file path] | [-members serverID=host:port1:port2;port3[,...]*]] | [-add serverId=host:port1:port2;port3[,...]]* [-remove serverId[,...]*]
        redo cmdno
        removewatches path [-c|-d|-a] [-l]
        rmr path
        set [-s] [-v version] path data
        setAcl [-s] [-v version] [-R] path acl
        setquota -n|-b val path
        stat [-w] path
        sync path
Command not found: Command not found help
[zk: localhost:2181(CONNECTED) 2] quit

WATCHER::

WatchedEvent state:Closed type:None path:null
2021-11-12 11:05:29,497 [myid:] - INFO  [main:ZooKeeper@1422] - Session: 0x1000029eae60000 closed
2021-11-12 11:05:29,497 [myid:] - INFO  [main-EventThread:ClientCnxn$EventThread@524] - EventThread shut down for session: 0x1000029eae60000
hadoop@master:~/opt/app/zookeeper/conf$

关闭zk服务端(单机版本)

zkServer.sh start # 启动zk服务端
zkServer.sh stop # 关闭zk服务端
zkServer.sh status # 查看zk服务端状态

配置伪分布式的Zookeeper

本小节的伪分布式集群部署是指在一台机器（master）上配置多个配置文件（zoo1.cfg,zoo2.cfg,zoo3.cfg），三个配置文件中设置不一样clientPort和dataDir，然后根据不同的配置文件来启动Zookeeper服务。
备注：本部分是在standlone已经完成安装的基础上进行的。

1. 创建并生成各自的配置文件：
   配置各个zk节点的配置文件，具体如下：

hadoop@master:~/opt/app/zookeeper/conf$ pwd
/home/hadoop/opt/app/zookeeper/conf
hadoop@master:~/opt/app/zookeeper/conf$ cp zoo.cfg zoo1.cfg
hadoop@master:~/opt/app/zookeeper/conf$ cp zoo.cfg zoo2.cfg
hadoop@master:~/opt/app/zookeeper/conf$ cp zoo.cfg zoo3.cfg

分布修改这三个配置文件：
clientPort分别为
2181、2182、2183
dataDir分别为
dataDir=/home/hadoop/opt/app/zookeeper/data1
dataDir=/home/hadoop/opt/app/zookeeper/data2
dataDir=/home/hadoop/opt/app/zookeeper/data3
手动创建这三个目录，并添加写的权限。

hadoop@master:~/opt/app/zookeeper$ mkdir data1
hadoop@master:~/opt/app/zookeeper$ mkdir data2
hadoop@master:~/opt/app/zookeeper$ mkdir data3
hadoop@master:~/opt/app/zookeeper$ ls
bin  conf  data0  data1  data2  data3  docs  lib  LICENSE.txt  logs  NOTICE.txt  README.md  README_packaging.txt

最后这三个配置文件的末尾均添加以下信息：
zoo1.cfg 配置文件

# dataDir=/tmp/zookeeper 注释掉这句默认配置，然后修改下面的配置
dataDir=/home/hadoop/opt/app/zookeeper/data1

# clientPort=2181 注释掉15行这句话，把这句内容放在文件尾部
clientPort=2181
# server.1=master:2888(数据同步端口):3888(Leader选举端口)
server.1=master:2888:3888
server.2=master:2889:3889
server.3=master:2890:3890

zoo2.cfg 配置文件

# dataDir=/tmp/zookeeper 注释掉这句默认配置，然后修改下面的配置
dataDir=/home/hadoop/opt/app/zookeeper/data2

# clientPort=2181 注释掉15行这句话，把这句内容放在文件尾部
clientPort=2182
# server.1=master:2888(数据同步端口):3888(Leader选举端口)
server.1=master:2888:3888
server.2=master:2889:3889
server.3=master:2890:3890

zoo3.cfg 配置文件

# dataDir=/tmp/zookeeper 注释掉这句默认配置，然后修改下面的配置
dataDir=/home/hadoop/opt/app/zookeeper/data3

# clientPort=2183 注释掉15行这句话，把这句内容放在文件尾部
clientPort=2183
# server.1=master:2888(数据同步端口):3888(Leader选举端口)
server.1=master:2888:3888
server.2=master:2889:3889
server.3=master:2890:3890

server.A=B:C:D中A是一个数字，表示这个是第几号服务器，B是这个服务器的IP地址，C表示这个服务器与集群中的Leader服务器交换信息的端口，D表示集群中的Leader服务器挂了，需要一个端口来重新进行选举，选出一个新的Leader，而这个端口就是用来执行选举时服务器相互通信的端口。对于伪分布集群的配置方式，由于B都是一样，需要为不同的Zookeeper服务通信端口分配不同的端口号。

在各个data目录下创建myid文件，并存入当前服务器的编号，如下：

hadoop@master:~/opt/app/zookeeper$ pwd
/home/hadoop/opt/app/zookeeper
hadoop@master:~/opt/app/zookeeper$ touch data1/myid
hadoop@master:~/opt/app/zookeeper$ touch data2/myid
hadoop@master:~/opt/app/zookeeper$ touch data3/myid

hadoop@master:~/opt/app/zookeeper$ echo 1 > data1/myid
hadoop@master:~/opt/app/zookeeper$ echo 2 > data2/myid
hadoop@master:~/opt/app/zookeeper$ echo 3 > data3/myid

2. 启动并测试Zookeeper伪分布式集群

依次启动Zookeeper服务，在启动的时候，选举算法依次投票，那么Leader
服务就是2号配置文件启动的服务。其他的节点服务都是Fllower，当启动第一台服务器的时候查看状态status是不可用的，因为集群中节点未在半数以上。集群中奇数和偶数对故障的容忍度是一致的，所以建议配置奇数个Zookeeper节点。

如下依次使用配置文件启动Zookeeper服务：

hadoop@master:~/opt/app/zookeeper$ zkServer.sh start /home/hadoop/opt/app/zookeeper/conf/zoo1.cfg # 通过zoo1.cfg启动zkServer
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/conf/zoo1.cfg
Starting zookeeper ... STARTED
hadoop@master:~/opt/app/zookeeper$ zkServer.sh status /home/hadoop/opt/app/zookeeper/conf/zoo1.cfg # 查看通过zoo1.cfg启动的zkServer状态
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/conf/zoo1.cfg
Client port found: 2181. Client address: localhost.
Error contacting service. It is probably not running.

hadoop@master:~/opt/app/zookeeper$ zkServer.sh start /home/hadoop/opt/app/zookeeper/conf/zoo2.cfg # 通过zoo2.cfg启动zkServer
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/conf/zoo2.cfg
Starting zookeeper ... STARTED
hadoop@master:~/opt/app/zookeeper$ zkServer.sh status /home/hadoop/opt/app/zookeeper/conf/zoo2.cfg # 查看通过zoo2.cfg启动的zkServer状态，为leader
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/conf/zoo2.cfg
Client port found: 2182. Client address: localhost.
Mode: leader

hadoop@master:~/opt/app/zookeeper$ zkServer.sh start /home/hadoop/opt/app/zookeeper/conf/zoo3.cfg # 通过zoo3.cfg启动zkServer
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/conf/zoo3.cfg
Starting zookeeper ... STARTED
hadoop@master:~/opt/app/zookeeper$ zkServer.sh status /home/hadoop/opt/app/zookeeper/conf/zoo3.cfg # 查看通过zoo3.cfg启动的zkServer状态
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/conf/zoo3.cfg
Client port found: 2183. Client address: localhost.
Mode: follower

hadoop@master:~/opt/app/zookeeper$ zkServer.sh status /home/hadoop/opt/app/zookeeper/conf/zoo1.cfg # 查看通过zoo1.cfg启动的zkServer状态
ZooKeeper JMX enabled by default
Using config: /home/hadoop/opt/app/zookeeper/conf/zoo1.cfg
Client port found: 2181. Client address: localhost.
Mode: follower

如下图：

此时使用命令jps查看所有进程:

hadoop@master:~/opt/app/zookeeper$ jps
4833 QuorumPeerMain
5060 Jps
4726 QuorumPeerMain
4607 QuorumPeerMain

客户端连接Zookeeper服务节点，则使用如下命令：

hadoop@master:~/opt/app/zookeeper$ zkCli.sh -server localhost:2181

Connecting to localhost:2181
#退出使用quit

配置全分布式的Zookeeper

对于Zookeeper完全分布式集群，配置文件则是在各自的服务器上，然后在各自的服务器上开启Zookeeper服务进程即可。