分布式Web应用----Linux环境下zookeeper集群环境的安装与配置

素颜马尾好姑娘i 2022-07-28 01:07 204阅读 0赞

### 写在前面 ###

zookeeper在分布式应用中运用的比较广泛，了解zookeeper的原理对理解分布架构的应用具有很大的帮助，学会安装zookeeper是学习zookeeper的前提，自己刚刚学习zookeeper，记录一下安装过程，增加自己印象，方便其它人学习。

![这里写图片描述][041834156393063.png]

### 下载zookeeper ###

zookeeper官网下载地址 ：[http://mirrors.hust.edu.cn/apache/zookeeper/stable/][http_mirrors.hust.edu.cn_apache_zookeeper_stable]  
获取稳定版本地址：[http://mirrors.hust.edu.cn/apache/zookeeper/stable/zookeeper-3.4.8.tar.gz][http_mirrors.hust.edu.cn_apache_zookeeper_stable_zookeeper-3.4.8.tar.gz]  
通过wget命令下载到服务器上。

wget http://mirrors.hust.edu.cn/apache/zookeeper/stable/zookeeper-3.4.8.tar.gz

### 解压zookeeper,并重命名为zookeeper ###

tar -zxvf  zookeeper-3.4.8.tar.gz
    mv  zookeeper-3.4.8 zookeeper

### 复制配置文件并配置zookeeper集群 ###

进入zookeeper/conf目录下

cp zoo_sample.cfg zoo.cfg

配置如下 ：

# 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=/var/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
    
    #server.id(服务器ID)=host(主机地址):port(follower与leader服务器通信端口):port(选取leader端口)
    server.1=192.168.1.105:2888:3888
    server.2=192.168.1.106:2888:3888
    server.3=192.168.1.107:2888:3888

在配置文件中主要关注三个地方，  
1. clientPort=2181 这个是连接zookeeper的端口  
2. dataDir=/var/zookeeper 这是zookeeper在启动过程中存放文件的目录  
3. server.1=192.168.1.105:2888:3888 这里是集群服务器的配置，zookeeper运行有三个模式

*  集群模式，上面配置的是集群模式，
 *  伪集群模式就是用单机来模仿集群模式，只需要将server.id后面的ip地址配置成一样的，然后用不同的端口
 *  单机模式，不需要配置server.id

### 在建立var/zookeeper/myid文件，输入对应的server的ID ###

同样的安装及配置复制到其它二台服务器上，zoo.cfg配置都一样，唯一不一样的是/var/zookeeper/myid文件中的值，例如我的配置中

192.168.1.105的 /var/zookeeper/myid中写1
    192.168.1.106的/var/zookeeper/myid中写2
    192.168.1.107的/var/zookeeper/myid中写3

### 启动zookeeper集群 ###

分别进入三台服务器的 zookeeper/bin目录下启动zookeeper

./zkServer.sh start  #启动
    ./zkServer.sh stop   #停止
    ./zkServer.sh restart  #重启

### 检查zookerper启动状态 ###

利用telnet命令连接到zookeeper

telnet 192.168.1.106 2181

telnet连接成功后，利用stat命令查看zookeeper状态

stat

192.168.1.106 服务器zookeeper状态

Zookeeper version: 3.4.8--1, built on 02/06/2016 03:18 GMT
    Clients:
     /127.0.0.1:45681[0](queued=0,recved=1,sent=0)
    Latency min/avg/max: 0/0/0
    Received: 3
    Sent: 2
    Connections: 1
    Outstanding: 0
    Zxid: 0x0
    Mode: follower
    Node count: 4
    Connection closed by foreign host.

192.168.1.107 服务器zookeeper状态

Zookeeper version: 3.4.8--1, built on 02/06/2016 03:18 GMT
    Clients:
     /121.41.84.103:36718[0](queued=0,recved=1,sent=0)
    
    Latency min/avg/max: 0/0/0
    Received: 5
    Sent: 4
    Connections: 1
    Outstanding: 0
    Zxid: 0x100000000
    Mode: leader
    Node count: 4
    Connection closed by foreign host.

我们可以看到107的Mode：leader说明这是leader服务器，106的mode:follower说明是follower服务器，这说明zookeeper集群安装配置成功了。

[041834156393063.png]: /images/20220727/4dc446cfb4dc4535889acfa5fa0dca0f.png
[http_mirrors.hust.edu.cn_apache_zookeeper_stable]: http://mirrors.hust.edu.cn/apache/zookeeper/stable/
[http_mirrors.hust.edu.cn_apache_zookeeper_stable_zookeeper-3.4.8.tar.gz]: http://mirrors.hust.edu.cn/apache/zookeeper/stable/zookeeper-3.4.8.tar.gz