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Catalog

The goal is

brief introduction

To configure ZooKeeper colony

1. Environmental preparation
2. Configuration steps
3. start-up ZooKeeper colony

The goal is

1. understand ZooKeeper essential information ;
2. Be familiar with the configuration ZooKeeper colony .

brief introduction

ZooKeeper Is used to maintain configuration information , name , A centralized service that provides distributed synchronization and group services .ZooKeeper The goal is to refine the nature of these different services into a very simple interface , To achieve centralized coordination services .

To configure ZooKeeper colony

Environmental preparation

Three stations Linux virtual machine , And they all have JDK Environmental Science .

Configuration steps

First step ： Click to enter ZooKeeper Official website , download Linux Version of ZooKeeper Installation package （ This article takes apache-zookeeper-3.6.2-bin.tar.gz Version as an example .）;

The second step ： Upload apache-zookeeper-3.6.2-bin.tar.gz To /opt Catalog （ A little ）;

The third step ： Unzip the file ：

tar -zxvf apache-zookeeper-3.6.2-bin.tar.gz

Step four ： stay /opt/apache-zookeeper-3.6.2-bin/conf Create under directory zoo.cfg file , Configure related parameters ：

# With zoo_sample.cfg As a template , establish zoo.cfg file .
cp /opt/apache-zookeeper-3.6.2-bin/conf/zoo_sample.cfg /opt/apache-zookeeper-3.6.2-bin/conf/zoo.cfg

#################zoo.cfg The contents of the configuration file are as follows ：#################
#ZooKeeper The basic unit of time used （ millisecond ）. It's used for heart beating , And the minimum session timeout will be tickTime Twice as many .
tickTime=2000
# The location where the in memory database snapshot is stored , Unless otherwise stated , Otherwise, it stores the transaction log updated by the database .
dataDir=/opt/apache-zookeeper-3.6.2-bin/data
# Port used to listen for client connections .
clientPort=2181
#ZooKeeper The server must be connected to leader Length of time . The length of time set here is 10 second （initLimit*tickTime）.
initLimit=5
# Limit the timeout range between the server and the host . The time range set here is 4 second （syncLimit*tickTime）.
syncLimit=2
#server.1 Medium 1 Show custom ZooKeeper Service for ID yes 1.
#192.168.120.xxx Express ZooKeeper Of the host server IP.
#2888 Indicates the use of machine communication within the cluster 2888 port .
#3888 To represent an election leader Use 3888 port .
server.1=192.168.120.100:2888:3888
server.2=192.168.120.101:2888:3888
server.3=192.168.120.102:2888:3888

Step five ： According to the configuration dataDir、server.ID、IP Create a new catalog and define a service number ;

# new directory 
mkdir /opt/apache-zookeeper-3.6.2-bin/data

# establish myid File and write the content as 1, It's actually configuration server.ID by 1.
echo 1 > /opt/apache-zookeeper-3.6.2-bin/data/myid

Step six ： Repeat the above steps for the other two virtual machines , Be careful ： The fifth step is to zoo.cfg The content is the standard of operation （ A little ）.

start-up ZooKeeper colony

############# stay /opt/apache-zookeeper-3.6.2-bin/bin Execute under directory ：#############
# start-up 
./zkServer.sh start
# Check the status 
./zkServer.sh status
# restart 
./zkServer.sh restart
# stop it 
./zkServer.sh stop