zookeeper cluster in a single machine

Environment

OS：Ubuntu
JDK: 1.8
Zookeeper: 3.4.12

Steps

unzip the tar.gz and make 3 copies

tar -xvf zookeeper-3.4.12.tar.gz

after copy there are 3 zookeeper folders

zookeeper-1
zookeeper-2
zookeeper-3

create each configuration file

vim zookeeper-1/conf/zoo.cfg
vim zookeeper-2/conf/zoo.cfg
vim zookeeper-3/conf/zoo.cfg
mkdir -p /var/data/zookeeper1/data
mkdir -p /var/data/zookeeper2/data
mkdir -p /var/data/zookeeper3/data
mkdir -p /var/data/zookeeper1/log
mkdir -p /var/data/zookeeper2/log
mkdir -p /var/data/zookeeper3/log
chmod 755 /var/data/zookeeper1/data
chmod 755 /var/data/zookeeper2/data
chmod 755 /var/data/zookeeper3/data
chmod 755 /var/data/zookeeper1/log
chmod 755 /var/data/zookeeper2/log
chmod 755 /var/data/zookeeper3/log

File content show below:

# time unit(milliesecond)
tickTime=2000
# data folder
dataDir=/var/data/zookeeper1/data
# log folder
dataLogDir=/var/data/zookeeper1/log
# server port
clientPort=2181
# timeout {initLimit}*{tickTime} when foller connect to leader
initLimit=5
# the synctime for the foller and leader, if timeout the foller will discard
syncLimit=2
#server.{myid}={host}:{heartbeat port}:{data port}
server.1=localhost:2881:3881
server.2=localhost:2882:3882
server.3=localhost:2883:3883

tickTime=2000
dataDir=/var/data/zookeeper1/data
dataLogDir=/var/data/zookeeper1/log
clientPort=2182
initLimit=5
syncLimit=2
server.1=localhost:2881:3881
server.2=localhost:2882:3882
server.3=localhost:2883:3883

tickTime=2000
dataDir=/var/data/zookeeper1/data
dataLogDir=/var/data/zookeeper1/log
clientPort=2183
initLimit=5
syncLimit=2
server.1=localhost:2881:3881
server.2=localhost:2882:3882
server.3=localhost:2883:3883

create myid file

This file will contains the content which configured in zoo.cfg

vim /var/data/zookeeper1/data/myid
vim /var/data/zookeeper2/data/myid
vim /var/data/zookeeper3/data/myid

Start the server and check status

 zoopeeper1/bin/zkServer.sh start
 zoopeeper2/bin/zkServer.sh start
 zoopeeper3/bin/zkServer.sh start

you can check the status use below command

zookeeper-1/bin/zkServer.sh status

It will return Mode: follower or Mode: leader