I. Download and Unzip

1. Introduction to Zookeeper

As a distributed service framework, Zookeeper is mainly used to solve the consistency problem of application systems in distributed cluster. It can provide data storage based on directory node tree similar to file system. But Zookeeper is not used to store data exclusively. Its function is mainly to maintain and monitor. The state of the data you store changes. By monitoring the changes of these data states, data-based cluster management can be achieved.

2. Download

Environment version
centos7
zookeeper 3.4.14

[root@localhost mysoft]$ cd /usr/local/mysoft/
[root@localhost mysoft]$
wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/zookeeper-3.4.14/zookeeper-3.4.14.tar.gz
[root@localhost mysoft]# tar -zxvf zookeeper-3.4.14.tar.gz
[root@localhost mysoft]# mv zookeeper-3.4.14 zookeeper3.4

II. Modification of configuration files

1. Data and log directories

[root@localhost /]# mkdir -p data/log/zkp1.log
[root@localhost /]# mkdir -p data/zkpdata/zkp1

2. Modify configuration

[root@localhost mysoft]# cd zookeeper3.4/conf/
[root@localhost conf]# cp zoo_sample.cfg zoo.cfg
[root@localhost conf]# vim zoo.cfg
# Modify the following two pieces of content, other defaults
dataDir=/data/zkpdata/zkp1
dataLogDir=/data/log/zkp1.log

3. Configuration file description

1)tickTime
 The time of heart rate examination.
2)initLimit
 The maximum number of heartbeats (tickTime s) that can be tolerated in the initial connection between the slave server and the primary server in the cluster.
3)syncLimit
 The maximum tolerable heartbeat number of requests and promises between slave and primary servers in a cluster.
4)dataDir
 Data storage directory.
5)dataLogDir
 Log storage directory.
6)clientPort
 The client connects to the port of the zookeeper server, which is monitored by the server by default of 2181.

3. Start-up operation

1. Start the server

[root@localhost bin]# pwd
/usr/local/mysoft/zookeeper3.4/bin
[root@localhost bin]# /usr/local/mysoft/zookeeper3.4/bin/zkServer.sh start /usr/local/mysoft/zookeeper3.4/conf/zoo.cfg 

ZooKeeper JMX enabled by default
Using config: /usr/local/mysoft/zookeeper3.4/conf/zoo.cfg
Starting zookeeper ... STARTED
[root@localhost bin]# ps -aux |grep zookeeper

2. Start the client

[root@localhost /]# cd /usr/local/mysoft/zookeeper3.4/bin/
[root@localhost bin]# ./zkCli.sh 
Connecting to localhost:2181

Common Operating Commands

## Create Nodes
[zk: localhost:2181(CONNECTED) 2] create /cicada cicada-smile1
Created /cicada
[zk: localhost:2181(CONNECTED) 8] create /cicada2 cicada-smile2
Created /cicada2
[zk: localhost:2181(CONNECTED) 4] get /cicada
cicada-smile1
## View directories 
[zk: localhost:2181(CONNECTED) 5] ls /
[zookeeper, cicada, cicada2] 
## View the specified directory
[zk: localhost:2181(CONNECTED) 17] ls / zookeeper
[com.ptp.user.service.UserService]
## Delete Nodes
[zk: localhost:2181(CONNECTED) 10] delete /cicada
## Delete all directories
[zk: localhost:2181(CONNECTED) 18] rmr /cicada2
[zk: localhost:2181(CONNECTED) 19] ls /cicada2
Node does not exist: /cicada2
## View the remaining nodes
[zk: localhost:2181(CONNECTED) 13] ls /
[zookeeper]

5. Source code address

GitHub Address: Know a smile
https://github.com/cicadasmile
 Code Yun Address: Know a smile
https://gitee.com/cicadasmile