机器准备

三台独立的linux主机, 内网IP分别为: 172.31.175.142、172.31.175.143、172.31.175.144

安装jdk8

rpm -ivh jdk-8u181-linux-x64.rpm

配置环境变量

cat << EOF >> /etc/profile
export JAVA_HOME=/usr/java/jdk1.8.0_181-amd64
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin
EOF
source /etc/profile

安装zookeeper3.4

wget http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.4.13/zookeeper-3.4.13.tar.gz
#/home/wx为当前用户的主目录
tar -xzvf zookeeper-3.4.13.tar.gz -C /home/wx
cd /home/wx
mv zookeeper-3.4.13 zookeeper
cd zookeeper
cp conf/zoo_sample.cfg conf/zoo.cfg

集群配置/运行

在zoo.cfg下指定data路径和server.i节点信息

# 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=/home/wx/zookeeper/data
# 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
#
# 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= 172.31.175.142:2888:3888
server.2= 172.31.175.143:2888:3888
server.3= 172.31.175.144:2888:3888

在server.i对应的主机上分别创建myid文件并写入对应标识,如下

echo "1" > ~/zookeeper/data/myid
echo "2" > ~/zookeeper/data/myid
echo "3" > ~/zookeeper/data/myid

分别启动zkServer

sh ~/zookeeper/bin/zkServer.sh start

查看状态

sh ~/zookeeper/bin/zkServer.sh status

显示结果, 分别为1个leader,2个follower

ZooKeeper JMX enabled by default

Using config: /home/wx/zookeeper/bin/../conf/zoo.cfg

Mode: follower

ZooKeeper JMX enabled by default

Using config: /home/jack/zookeeper/bin/../conf/zoo.cfg

Mode: leader

ZooKeeper JMX enabled by default

Using config: /home/wx/zookeeper/bin/../conf/zoo.cfg

Mode: follower

可以kill掉leader, 然后剩下的两台zk, 会选举产生新的leader.