zk的单机部署，与客户端的使用

下载zk 

wget https://archive.apache.org/dist/zookeeper/stable/apache-zookeeper-3.5.5-bin.tar.gz

安装jdk

tar xf jdk-12.0.2_linux-x64_bin.tar.gz -C /usr/local/
vim /etc/profile.d/jdk.sh
export JAVA_HOME=/usr/local/jdk
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$PATH
ln -s /usr/local/jdk-12.0.2 /usr/local/jdk

部署zk 

mkdir /data/zk -pv
tar xf apache-zookeeper-3.5.5-bin.tar.gz  -C /data/zk/
cp /data/zk/apache-zookeeper-3.5.5-bin/bin/../conf/zoo_sample.cfg /data/zk/apache-zookeeper-3.5.5-bin/bin/../conf/zoo.cfg
创建数据目录 mkdir /data/zk/data
[root@master conf]# vim zoo.cfg 

# 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/zk/data   数据目录
# 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

　　配置zk的环境变量

[root@master conf]# vim /etc/profile.d/zk.sh 

export ZOOKEEPER_HOME=/data/zk/apache-zookeeper-3.5.5-bin
export ZOOBINDIR=/data/zk/apache-zookeeper-3.5.5-bin/bin
export PATH=$ZOOKEEPER_HOME/bin:$PATH

[root@master conf]# exec bash

　　启动

[root@master conf]# zkServer.sh start

　　客户端登录

[root@master conf]# zkCli.sh 
[zk: localhost:2181(CONNECTED) 0] help   帮助
ZooKeeper -server host:port cmd args
	addauth scheme auth
	close 
	config [-c] [-w] [-s]
	connect host:port
	create [-s] [-e] [-c] [-t ttl] path [data] [acl]
	delete [-v version] path
	deleteall path
	delquota [-n|-b] path
	get [-s] [-w] path
	getAcl [-s] path
	history 
	listquota path
	ls [-s] [-w] [-R] path
	ls2 path [watch]
	printwatches on|off
	quit 
	reconfig [-s] [-v version] [[-file path] | [-members serverID=host:port1:port2;port3[,...]*]] | [-add serverId=host:port1:port2;port3[,...]]* [-remove serverId[,...]*]
	redo cmdno
	removewatches path [-c|-d|-a] [-l]
	rmr path
	set [-s] [-v version] path data
	setAcl [-s] [-v version] [-R] path acl
	setquota -n|-b val path
	stat [-w] path
	sync path
Command not found: Command not found help
[zk: localhost:2181(CONNECTED) 1] create /app4   创建node
Created /app4
[zk: localhost:2181(CONNECTED) 2] create /app4/p-1
Created /app4/p-1
[zk: localhost:2181(CONNECTED) 3] create /app4/p-2
Created /app4/p-2
[zk: localhost:2181(CONNECTED) 4] create /app4/p-3
Created /app4/p-3
[zk: localhost:2181(CONNECTED) 5] ls -R / 查看node
/
/app1
/app2
/app4
/zookeeper
/app1/p_1
/app1/p_2
/app1/p_3
/app4/p-1
/app4/p-2
/app4/p-3
/zookeeper/config
/zookeeper/quota

　　客户端创建分布式锁

[zk: localhost:2181(CONNECTED) 6] create -e /log
Created /log
[root@master data]# zkCli.sh 
[zk: localhost:2181(CONNECTED) 2] create -e /log   
Node already exists: /log
[zk: localhost:2181(CONNECTED) 3] stat -w /log  监控这个锁
cZxid = 0x14
ctime = Wed Sep 11 16:31:46 CST 2019
mZxid = 0x14
mtime = Wed Sep 11 16:31:46 CST 2019
pZxid = 0x14
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x100014034170002
dataLength = 0
numChildren = 0
退出第一个客户端；释放锁
[zk: localhost:2181(CONNECTED) 7] quit

WATCHER::

WatchedEvent state:Closed type:None path:null
2019-09-11 16:35:02,053 [myid:] - INFO  [main:ZooKeeper@1422] - Session: 0x100014034170002 closed
2019-09-11 16:35:02,053 [myid:] - INFO  [main-EventThread:ClientCnxn$EventThread@524] - EventThread shut down for session: 0x100014034170002
释放锁后
[zk: localhost:2181(CONNECTED) 4] 
WATCHER::

WatchedEvent state:SyncConnected type:NodeDeleted path:/log

[zk: localhost:2181(CONNECTED) 4] create -e /log  第二的
Created /log