分布式架构中一致性解决方案——Zookeeper集群搭建

￡神魔★判官ぃ 2022-07-14 04:24 138阅读 0赞

当我们的项目在不知不觉中做大了之后，各种问题就出来了，真jb头疼，比如性能，业务系统的并行计算的一致性协调问题，比如分布式架构的事务问题，

我们需要多台机器共同commit事务，经典的案例当然是银行转账，支付宝转账这种，如果是一台机器的话，这个还是很方便的，windows中自带了一个事务协

调器mstsc，但是呢，你那种很大很牛逼的项目不可能全是windows服务器，对吧，有些人为了解决这个问题，会采用2pc，3pc这种算法，或者是paxos的思

想进行分布式下的一致性处理，当然在这个世界上，真的不需要你自己去开发这种协调性，因为现在已经有了专门解决这种问题的解决方案，比如zookeeper。

一：zookeeper集群搭建

有些人应该明白，zookeeper正是google的chubby的开源实现，使用zookeeper之前，我们先来搭建一个集群。

1. 下载

从官网上，我们可以看到，zookeeper的最新版本是3.4.8，下载地址是：http://apache.fayea.com/zookeeper/zookeeper-3.4.8/，可以下载一下：

![214741-20160708164845858-523589648.png][]

2. 文件夹配置

接下来我们解压一下，根目录为zkcluster，下面使用clientport（3000，3001，3002）这样的端口作为文件夹名称，里面就是zookeeper解压包，如下面这样：

![214741-20160708170001014-721958756.png][]

3. 配置zoo.cfg

现在我们有三个文件夹，也就是3个zookeeper程序，在3001/conf/下面有一个zoo\_sample.cfg文件，现在我们改成zoo.cfg，并且修改如下：

![复制代码][copycode.gif]

# 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=/root/zkcluster/3001/data
    dataLogDir=/root/zkcluster/3001/logs
    # the port at which the clients will connect
    clientPort=3001
    # the maximum number of client connections.
    # increase this if you need to handle more clients
    #maxClientCnxns=6
    #
    # 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=192.168.161.134:2888:3888
    server.2=192.168.161.134:2889:3889
    server.3=192.168.161.134:2890:3890

![复制代码][copycode.gif]

这里我们要注意的是，红色的部分分别就是：指定zookeeper的data和log文件夹，指定clientport访问的端口和servers的列表。

4. 生成pid文件

我们在servers列表中，可以看到有server.1 ,server.2, server.3 三个字符串，生成pid文件的内容就取决如此，比如server.1的地址，

我们的pid文件里面就是1，不过要知道的是，pid文件要在data目录下，比如下面这样:

![214741-20160708170802092-668922295.png][]

ok，同样的道理，3002和3003的文件夹同3001就可以了，比如他们的zoo.cfg如下：

\--------  3002 --------------

![复制代码][copycode.gif]

# 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=/root/zkcluster/3002/data
    dataLogDir=/root/zkcluster/3002/logs
    # the port at which the clients will connect
    clientPort=3002
    # the maximum number of client connections.
    # increase this if you need to handle more clients
    #maxClientCnxns=6
    #
    # 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=192.168.161.134:2888:3888
    server.2=192.168.161.134:2889:3889
    server.3=192.168.161.134:2890:3890

![复制代码][copycode.gif]

\--------  3003 --------------

![复制代码][copycode.gif]

# 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=/root/zkcluster/3003/data
    dataLogDir=/root/zkcluster/3003/logs
    # the port at which the clients will connect
    clientPort=3003
    # the maximum number of client connections.
    # increase this if you need to handle more clients
    #maxClientCnxns=6
    #
    # 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=192.168.161.134:2888:3888
    server.2=192.168.161.134:2889:3889
    server.3=192.168.161.134:2890:3890

![复制代码][copycode.gif]

5. 启动各自服务器

到现在为止，我们各个zookeeper程序的配置都结束了，接下来我们到各自目录的bin目录下，通过zkServer.sh来进行启动，比如下面这样：![214741-20160708171257827-66112955.png][]

ok，接下来我们来开始启动，通过如下命令即可：

./zkServer.sh start-foreground

![214741-20160708171508749-1716993893.png][]

现在我们都启动了，接下来我们可以用命令看下哪个server是leader，哪些是follower。。。

![复制代码][copycode.gif]

[root@localhost bin]# ./zkServer.sh status
    ZooKeeper JMX enabled by default
    Using config: /root/zkcluster/3001/bin/../conf/zoo.cfg
    Mode: follower
    [root@localhost bin]# 
    
    
    [root@localhost bin]# ./zkServer.sh status
    ZooKeeper JMX enabled by default
    Using config: /root/zkcluster/3002/bin/../conf/zoo.cfg
    Mode: leader
    [root@localhost bin]# 
    
    [root@localhost bin]# ./zkServer.sh status
    ZooKeeper JMX enabled by default
    Using config: /root/zkcluster/3003/bin/../conf/zoo.cfg
    Mode: follower
    [root@localhost bin]#

![复制代码][copycode.gif]

到目前为止，我们的服务端操作都ok啦，，，是不是好吊。。。

二：驱动下载

1.  java的驱动就方便了，直接在源代码中就提供了，直接copy一下lib文件夹中的jar包就ok了，真是tmd的方便。

![214741-20160708172134061-1261796183.png][]

2. 用C\#驱动的也不要太烦，要使用也是不难的，我们可以通过nuget下载一下就可以了，转换过来的版本也是3.4.8的最新版本，比如下面这样：

![214741-20160708172244374-1377713457.png][]

好了，大概就说这么多，希望对你有帮助~~~

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