1、在10.4.7.11，10.4.7.12，10.4.7.21上配置java环境

1、下载jdk

1、下载jdk-8u221-linux.x64.tar.gz到/opt/src目录

2、解压到/usr/java目录：tar xf jdk-8u221-linux-x64.tar.gz -C /usr/java

3、制作软链接：ln -s /usr/java/jdk1.8.0_221 /usr/java/jdk

2、配置环境变量

vim /etc/profile
输入：
export JAVA_HOME=/usr/java/jdk
export PATH=$JAVA_HOME/bin:$JAVA_HOME/bin:$PATH
export CLASSPATH=$CLASSPATH:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jar

执行：source /etc/profile

验证：java -version

2、在10.4.7.11，10.4.7.12，10.4.7.21上安装zookeeper

https://archive.apache.org/dist/zookeeper/

1、下载zookeeper（/opt/src）

1、wget https://archive.apache.org/dist/zookeeper/zookeeper-3.4.14/zookeeper-3.4.14.tar.gz

2、解压到opt目录下：tar xf zookeeper-3.4.14.tar.gz -C /opt

3、制作软链接：ln -s /opt/zookeeper-3.4.14/ /opt/zookeeper

4、新建zookeeper日志目录
mkdir -pv /data/zookeeper/data /data/zookeeper/logs

2、创建配置文件

vi /opt/zookeeper/conf/zoo.cfg
输入：
# 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=/data/zookeeper/data
dataLogDir=/data/zookeeper/logs
# 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
server.1=zk1.jack.com:2888:3888
server.2=zk2.jack.com:2888:3888
server.3=zk3.jack.com:2888:3888
#
# 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

3、10.4.7.11上添加域名解析

vi /var/named/jack.com.zone
添加：
zk1 A 10.4.7.11
zk2 A 10.4.7.12
zk3 A 10.4.7.21

执行：systemctl restart named
验证：dig -t A zk1.jack.com @10.4.7.11 +short

4、配置成为集群

在三台zk主机上添加myid文件7-11为1，7-12的myid为2，7-21的为3，使之成为集群，为什么要这样改？请参考官方文档。
vi /data/zookeeper/data/myid
输入：1

5、启动zookeeper（10.4.7.11,10.4.7.12,10.4.7.21）

/opt/zookeeper/bin/zkServer.sh start

/opt/zookeeper/bin/zkServer.sh status

ps aux | grep zoo

netstat -nltp | grep 2181