zookeeper 分布式集群安装

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zookeeper 集群安装

zookeeper 集群安装

本次搭建，将会搭建基本的zookeeper集群，三台，（要求3+，且必须是奇数，因为zookeeper的选举算法）

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架构图：
          +--------+
          | leader |
          +--------+
              |
              | 
    +----+----+----+----+
    |                   |
    |                   |           
+----------+      +----------+
| follow 1 |      | follow 2 |
+----------+      +----------+
IP 端口 模式 领导端口 选举端口
192.168.10.242 2181 leader 28881 38881
192.168.10.242 2182 follow 28882 38882
192.168.10.242 2183 follow 28883 38883

1、环境

  • Linux：CentOS release 6.5 (Final) Kernel
  • zookeeper：3.4.10

2、下载

通过http://zookeeper.apache.org/releases.html#download下载zookeeper的稳定版本，本次是下载的3.4.10

3、解压与编译

将zookeeper-3.4.10.tar.gz放入/data/app/zookeeper-cluster目录，并解压：

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tar zxvf zookeeper-3.4.10.tar.gz
mv zookeeper-3.4.10 zookeeper-3.4.10-1

tar zxvf zookeeper-3.4.10.tar.gz
mv zookeeper-3.4.10 zookeeper-3.4.10-2

tar zxvf zookeeper-3.4.10.tar.gz
mv zookeeper-3.4.10 zookeeper-3.4.10-3

4、建立/dataDir文件目录,并建立对应的myid文件

进入/data/app/zookeeper-3.4.10目录，建立如下目录

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mkdir -p /data/app/zookeeper-cluster/zookeeper-3.4.10-1/data
mkdir -p /data/app/zookeeper-cluster/zookeeper-3.4.10-2/data
mkdir -p /data/app/zookeeper-cluster/zookeeper-3.4.10-3/data


echo "1" > /data/app/zookeeper-cluster/zookeeper-3.4.10-1/data/myid
echo "2" > /data/app/zookeeper-cluster/zookeeper-3.4.10-2/data/myid
echo "3" > /data/app/zookeeper-cluster/zookeeper-3.4.10-3/data/myid

5、配置文件

进入/data/app/zookeeper-cluster/zookeeper-3.4.10-1/conf目录

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cp zoo_sample.cfg zoo.cfg

编辑zoo1.cfg配置文件：

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# The number of milliseconds of each tick
# 心跳时间(毫秒数)
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
# 这个配置项标识Leader与Follower之间发送消息，请求和应答时间长度，
# 最长不能超过多少个 tickTime 的时间长度，总的时间长度就是5*2000=10秒
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just 
# example sakes.
# 数据存储目录
dataDir=/data/app/zookeeper-cluster/zookeeper-3.4.10-1/data
# the port at which the clients will connect
# 客户端端口
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
# (28881端口是leader的端口，38881端口是leader挂掉后选举leader用到的通讯渠道端口)
server.1=192.168.10.242:28881:38881
server.2=192.168.10.242:28882:38882
server.3=192.168.10.242:28883:38883

复制zoo.cfg配置到对应目录，修改对应dataDir与clientPort
zoo.conf

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dataDir=/data/app/zookeeper-cluster/zookeeper-3.4.10-2/data
clientPort=2182

zoo.conf

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dataDir=/data/app/zookeeper-cluster/zookeeper-3.4.10-3/data
clientPort=2183

注意：
1.此次配置的server.x要与之前写入myid文件中的数字对应
2.另外由于本次的三个zookeeper均在一台机器上，所以此次的server.1、server.2及server.3中的leader的端口与选举leader的端口是不一致的，如果部署在多台机器上，这三台配置的端口就不用这么折腾了，用同一份配置就好。

6、启动服务

进入bin目录

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./zkServer.sh start

7、验证服务是否启动

进入bin目录

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./zkServer.sh status

可以看到下面两种模式则说明已经成功启动
Mode：follow

Mode：leader