Catalogue
1. Configuration
2. Start all servers of zookeeper pseudo cluster
3. Access Client
4. Writing startup scripts

1. Configuration

zookeeper download address: http://mirrors.cnnic.cn/apache/zookeeper/zookeeper-3.4.6/ 
Deploy three servers on a machine, create a folder zookeeperLab under the specified folder, create three folders server1, server2, server3 in the zookeeperLab folder, then unzip a zookeeper download package inside each folder, and create several folders as follows:
data，dataLog， logs，zookeeper-3.4.6 
1. Enter the data directory and create a file named myid, which writes a number, such as server1, then write a 1, a myid file for server2, and a myid file for server3.(
2. Enter the zookeeper-3.4.6/conf directory, change the copy of the zoo_sample.cfg file to zoo.cfg, and open zoo.cfg as follows:

conf  cat zoo.cfg
# The number of milliseconds of each tick
#Controls heartbeat and timeout, with the smallest session timeout twice as long as tickTime by default.
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
#initLimit: This configuration item is used to configure the maximum number of heartbeat intervals a Zookeeper can tolerate when initializing a connection to a client that is not a user connecting to the Zookeeper server, but a Follower server connected to the Leader in the Zookeeper server cluster.When the Zookeeper server has not received a return message from the client after more than 10 heartbeats (tickTime), the client connection fails.The total length of time is 5*2000=10 seconds
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
#syncLimit: This configuration item identifies the length of time for sending messages, requests, and responses between Leader and Follower. The maximum number of tickTime s is 2*2000=4 seconds
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/Users/duwei/software/zookeeperLab/server1/data
dataLogDir=/Users/duwei/software/zookeeperLab/server1/dataLog
# the port at which the clients will connect
#Client Connection Port
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.1=127.0.0.1:2888:3888
server.2=127.0.0.1:2889:3889
server.3=127.0.0.1:2890:3890

Be careful:

2. Start all servers of zookeeper pseudo-cluster

Start the service by going into the zookeeper-3.4.6/bin directory of each of the three servers

sh zkServer.sh start

View server status when startup is complete

sh zkServer.sh status

3. Access Client

Enter the zookeeper/bin directory of any server, start a client, and access the service.

./zkCli.sh –server localhost:2181 

4. Writing startup scripts

vi zkCluster.sh

#!/bin/sh
zkpath=/Users/duwei/software/zookeeperLab
returnValue=0
cd $zkpath
pid=`ps -ef |grep -v "grep"|grep "zookeeperLab/server" |awk '{print $2}'`
start(){
    sh ./server1/zookeeper-3.4.6/bin/zkServer.sh start
    sh ./server2/zookeeper-3.4.6/bin/zkServer.sh start
    sh ./server3/zookeeper-3.4.6/bin/zkServer.sh start
}
stop(){
    kill -9 ${pid}
}
case "$1" in
start)
    start
    ;;
stop)
    stop
    ;;
restart)
    stop
    start
    ;;
hup)
    hup
    ;;
*)
    printf 'Usage: %s {start|stop|restart}\n'
    exit 1
    ;;
esac
exit "$returnValue"