zookeeper集群的Linux安装步骤

一、  环境准备

Zookeeper运行需要jdk支持，首先确认操作系统安装了jdk。
Zookeeper节点部署越多，服务的可靠性越高，建议部署奇数个节点，因为zookeeper集群是以宕机个数过半才会让整个集群宕机的。
需要给每个zookeeper 1G左右的内存，如果可能的话，最好有独立的磁盘，因为独立磁盘可以确保zookeeper是高性能的。如果你的集群负载很重，不要把zookeeper和RegionServer运行在同一台机器上面，就像DataNodes和TaskTrackers一样。

 

操作系统:

CentOS-7-x86_64-1611

 

节点IP端口:

192.168.0.70:2181

192.168.0.83:2181

192.168.0.104:2181

192.168.0.105:2181

192.168.0.106:2181

 
二、  zookeeper安装

 
1. 下载zookeeper
Zookeeper官网地址：http://zookeeper.apache.org/
 

cd /usr/local wget http://mirrors.cnnic.cn/apache/zookeeper/zookeeper-3.4.9/zookeeper-3.4.9.tar.gz

 
2. 解压、创建集群目录

cd /usr/local tar -zxvf zookeeper-3.4.9.tar.gz mkdir -p /usr/local/zookeeper_cluster/zkserver/ mkdir -p /usr/local/zookeeper_cluster/zkserver/logs mkdir -p /usr/local/zookeeper_cluster/zkserver/data cp -ri /usr/local/zookeeper-3.4.9/ /usr/local/zookeeper_cluster/zkserver/zookeeper cd /usr/local/zookeeper_cluster/zkserver/zookeeper ls

 

三、  zookeeper集群配置

 

1. 拷贝创建zoo.cfg配置文件

cp /usr/local/zookeeper_cluster/zkserver/zookeeper/conf/zoo_sample.cfg /usr/local/zookeeper_cluster/zkserver/zookeeper/conf/zoo.cfg

 
2. 修改每个node节点（共5个node节点）配置文件如下

# 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=/usr/local/zookeeper_cluster/zkserver/data dataLogDir=/usr/local/zookeeper_cluster/zkserver/logs # 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.0=192.168.0.70:2101:3101 server.1=192.168.0.83:2101:3101 server.2=192.168.0.104:2101:3101 server.3=192.168.0.105:2101:3101 server.4=192.168.0.106:2101:3101

其他节点类似，注意修改路径中的节点名，如：这里要注意下server.0这个后缀，表示的是192.168.0.70这个机器，在机器中的server id是0，2101是节点通信端口，3101是节点选举端口
 
3. 创建标识集群中Server ID
创建myid文件

cd /usr/local/zookeeper_cluster/zkserver/data vi myid

在/usr/local/zookeeper_cluster/zkserver/data目录中创建文件 myid文件，每个文件中分别写入当前机器的server id，例如在zoo.cfg文件中server.0这个机器，在/usr/local/zookeeper_cluster/zkserver/data目录的myid文件中写入数字0.
 
4. 启动zookeeper集群

/usr/local/zookeeper_cluster/zkserver/zookeeper/bin/zkServer.sh start

在集群中所有节点启动前，已启动的zookeeper服务会报错，因为心跳其他节点时其他节点还未启动，这里可以忽略。所有节点全部正常启动后不会报错。
 
5.  检测zookeeper集群是否启动成功

/usr/local/zookeeper_cluster/zkserver/zookeeper/bin/zkServer.sh status

 

通过状态可以看到有一个leader节点和多个follower节点

 
6. 通过客户端连接集群

/usr/local/zookeeper_cluster/zkserver/zookeeper/bin/zkCli.sh -server 192.168.0.70:2181