【运维技术】Zookeeper单机以及集群搭建教程

Zookeeper单机以及集群搭建教程

单机搭建

单机安装以及启动

安装zookeeper的前提是必须有java环境

# 选择目录进行下载安装
cd /app
# 下载zk，可以去官方网站下载，自己上传
wget https://archive.apache.org/dist/zookeeper/zookeeper-3.4.11/zookeeper-3.4.11.tar.gz
# 解压zk
tar -zxvf zookeeper-3.4.11.tar.gz
# 设定软连接
ln -s zookeeper-3.4.11 zookeeper
# 添加两个目录，一个是数据目录，一个是日志目录
cd zookeeper/
mkdir data
mkdir log
# 添加配置文件zoo.cfg在zookeeper的config目录下面见【2】使用：wq! 进行保存
cd conf
cp zoo_sample.cfg zoo.cfg
# 修改 dataDir=/app/zookeeper/data  dataLogDir=/app/zookeeper/log 目录
vi zoo.cfg
# 进入bin目录进行启动
cd ../bin
./zkServer.sh start
# 显示如下：Starting zookeeper ... STARTED即为成功

单机配置zoo.cfg的配置的内容，只需要修改dataDir、dataLogDir

# 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=/app/zookeeper/data
dataLogDir=/app/zookeeper/log
# 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

单机常用命令

# 进入zookeeper目录使用命令,连接成功则说明通过
./zkCli.sh
# 启动zk服务
./zkServer.sh start
# 查看zk服务状态
./zkServer.sh status
# 停止zk服务
./zkServer.sh stop
# 重启zk服务
./zkServer.sh restart

集群搭建

虚拟机配置

虚拟机1	虚拟机2	虚拟机3
172.16.48.129	172.16.48.130	172.16.48.131
myid:1	myid:2	myid:3

myid配置

# 在每个虚拟机的dataDir=/app/zookeeper/data目录下面创建myid文件
cd /app/zookeeper/data
# 创建myid文件，内容依照表格1，2，3.使用:wq进保存
vim myid

zoo.cfg配置添加

# 其他配置同单机配置
# 在zoo.cfg下面添加如下的集群配置server.myid
# 对应其他实例的内网ip地址
server.1=172.16.48.129:2888:3888
server.2=172.16.48.130:2888:3888
server.3=172.16.48.131:2888:3888

在三台虚拟机的终端同时启动三个zookeeper实例，zk1 -》 zk2 -》 zk3

cd /app/zookeeper/bin
./zkServer.sh start
./zkServer.sh status
# 分别在状态中显示了leader还是follower

虚拟机1	虚拟机2	虚拟机3
172.16.48.129	172.16.48.130	172.16.48.131
follower	follower	leader

高可用测试

按照道理zookeeper高可用3台的情况下只要两台挂了，集群就无法提供服务了。


一台挂了的情况: 关闭虚拟机3的zookeeper，调用status命令

虚拟机1	虚拟机2	虚拟机3
172.16.48.129	172.16.48.130	172.16.48.131
follower	leader	Error contacting service. It is probably not running.

虚拟机2转为了leader，虚拟机1和2一起提供服务

两台挂了的情况: 关闭虚拟机2的zookeeper，调用status命令

虚拟机1	虚拟机2	虚拟机3
172.16.48.129	172.16.48.130	172.16.48.131
Error contacting service. It is probably not running.	Error contacting service. It is probably not running.	Error contacting service. It is probably not running.

重新启动一台后，虚拟机1和虚拟机2能够提供服务