一、zookeeper的安装
1、下载zookeeper(当然在安装zookeeper之前得先装好jdk，这里就不说了)，版本自己随便选一个(后面我再说版本的问题)，点击这里下载。
2、然后在usr下创建zookeeper文件夹，把下载的tar包扔进去，再解压缩。
3、之后在解压缩的根目录创建data文件夹，如下:
4、创建好之后进入data文件夹，pwd命令获取到data文件夹的绝对路径。复制data的绝对路径，返回上一级，打开conf文件夹，重命名conf文件夹下的zoo_samle.cfg为zoo.cfg，再打开编辑zoo.cfg，更改dataDir的位置为刚刚复制的data目录的绝对路径:
5、到这里就已经全部安装好了，进入解压后的根目录下面的bin目录执行:./zkServer.sh start执行开启zookeeper就可以了。
6、查看当前zookeeper运行状态 ，./zkServer.sh status
JMX enabled by default
Using config: /root/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: standalone
7、连接客户端 sh zkCli.sh 断开连接 ctrl+c
Connecting to localhost:2181
2019-03-11 07:30:32,026 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
2019-03-11 07:30:32,028 [myid:] - INFO [main:Environment@100] - Client environment:host.name=localhost
2019-03-11 07:30:32,028 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.7.0_71
2019-03-11 07:30:32,031 [myid:] - INFO [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2019-03-11 07:30:32,031 [myid:] - INFO [main:Environment@100] - Client environment:java.home=/usr/local/src/java/jdk1.7.0_71/jre
2019-03-11 07:30:32,031 [myid:] - INFO [main:Environment@100] - Client environment:java.class.path=/root/zookeeper-3.4.6/bin/../build/classes:/root/zookeeper-3.4.6/bin/../build/lib/*.jar:/root/zookeeper-3.4.6/bin/../lib/slf4j-log4j12-1.6.1.jar:/root/zookeeper-3.4.6/bin/../lib/slf4j-api-1.6.1.jar:/root/zookeeper-3.4.6/bin/../lib/netty-3.7.0.Final.jar:/root/zookeeper-3.4.6/bin/../lib/log4j-1.2.16.jar:/root/zookeeper-3.4.6/bin/../lib/jline-0.9.94.jar:/root/zookeeper-3.4.6/bin/../zookeeper-3.4.6.jar:/root/zookeeper-3.4.6/bin/../src/java/lib/*.jar:/root/zookeeper-3.4.6/bin/../conf:.:/usr/local/src/java/jdk1.7.0_71/lib.tools.jar
2019-03-11 07:30:32,031 [myid:] - INFO [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/i386:/lib:/usr/lib
2019-03-11 07:30:32,031 [myid:] - INFO [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2019-03-11 07:30:32,031 [myid:] - INFO [main:Environment@100] - Client environment:java.compiler=<NA>
2019-03-11 07:30:32,033 [myid:] - INFO [main:Environment@100] - Client environment:os.name=Linux
2019-03-11 07:30:32,033 [myid:] - INFO [main:Environment@100] - Client environment:os.arch=i386
2019-03-11 07:30:32,033 [myid:] - INFO [main:Environment@100] - Client environment:os.version=2.6.32-431.el6.i686
2019-03-11 07:30:32,033 [myid:] - INFO [main:Environment@100] - Client environment:user.name=root
2019-03-11 07:30:32,033 [myid:] - INFO [main:Environment@100] - Client environment:user.home=/root
2019-03-11 07:30:32,033 [myid:] - INFO [main:Environment@100] - Client environment:user.dir=/root/zookeeper-3.4.6/bin
2019-03-11 07:30:32,034 [myid:] - INFO [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@d5e4c7
Welcome to ZooKeeper!
2019-03-11 07:30:32,080 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@975] - Opening socket connection to server localhost/0:0:0:0:0:0:0:1:2181. Will not attempt to authenticate using SASL (unknown error)
JLine support is enabled
2019-03-11 07:30:32,102 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@852] - Socket connection established to localhost/0:0:0:0:0:0:0:1:2181, initiating session
2019-03-11 07:30:32,121 [myid:] - INFO [main-SendThread(localhost:2181):ClientCnxn$SendThread@1235] - Session establishment complete on server localhost/0:0:0:0:0:0:0:1:2181, sessionid = 0x167d21b8ff0007a, negotiated timeout = 30000
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] help
ZooKeeper -server host:port cmd args
connect host:port
get path [watch]
ls path [watch]
set path data [version]
rmr path
delquota [-n|-b] path
quit
printwatches on|off
create [-s] [-e] path data acl
stat path [watch]
close
ls2 path [watch]
history
listquota path
setAcl path acl
getAcl path
sync path
redo cmdno
addauth scheme auth
delete path [version]
setquota -n|-b val path
[zk: localhost:2181(CONNECTED) 1]
8.创建一个资源节点并查看当前目录下的资源
[zk: localhost:2181(CONNECTED) 1] create /oldservice 0
Created /oldservice
[zk: localhost:2181(CONNECTED) 2] ls /
[oldservice, dubbo, zookeeper]
[zk: localhost:2181(CONNECTED) 3] create /oldservice/wsdl 1
Created /oldservice/wsdl
[zk: localhost:2181(CONNECTED) 4] ls /
[oldservice, dubbo, zookeeper]
[zk: localhost:2181(CONNECTED) 5] ls /oldservice
[wsdl]
[zk: localhost:2181(CONNECTED) 6]
9.删除节点，必须一层一层对应删除
[zk: localhost:2181(CONNECTED) 7] delete /oldservice/wsdl
[zk: localhost:2181(CONNECTED) 8] ls /oldservice
[]
[zk: localhost:2181(CONNECTED) 9] delete /oldservice
[zk: localhost:2181(CONNECTED) 10] ls /
[dubbo, zookeeper]
[zk: localhost:2181(CONNECTED) 11]
10.拿到节点信息 --节点特性：（节点唯一，临时节点(不能有子节点 -e)，有序(-s)和无序节点）
[zk: localhost:2181(CONNECTED) 13] get /dubbo
null
cZxid = 0x2
ctime = Fri Dec 21 11:26:37 PST 2018
mZxid = 0x2
mtime = Fri Dec 21 11:26:37 PST 2018
pZxid = 0x8b2
cversion = 11
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 11
JMX enabled by default
Using config: /root/zookeeper-3.4.6/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.
https://blog.csdn.net/dajiabudongdao/article/details/51941653