ZooKeeper Hello, world!

Install ZooKeeper as follows:

tar zxvf zookeeper-3.4.8.tar.gz

Setup and run ZooKeeper as follows:

cd zookeeper-3.4.8

conf/zoo.cfg

tickTime=2000
dataDir=/Users/izeye/zookeeper-data
clientPort=2181

./bin/zkServer.sh start

Test ZooKeeper as follows:

./bin/zkCli.sh

[zk: localhost:2181(CONNECTED) 0] help
ZooKeeper -server host:port cmd args
stat path [watch]
set path data [version]
ls path [watch]
delquota [-n|-b] path
ls2 path [watch]
setAcl path acl
setquota -n|-b val path
history
redo cmdno
printwatches on|off
delete path [version]
sync path
listquota path
rmr path
get path [watch]
create [-s] [-e] path data acl
addauth scheme auth
quit
getAcl path
close
connect host:port
[zk: localhost:2181(CONNECTED) 1] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 2] create /zk_test my_data
Created /zk_test
[zk: localhost:2181(CONNECTED) 3] ls /
[zookeeper, zk_test]
[zk: localhost:2181(CONNECTED) 4] get /zk_test
my_data
cZxid = 0x11
ctime = Mon Jul 11 21:03:22 KST 2016
mZxid = 0x11
mtime = Mon Jul 11 21:03:22 KST 2016
pZxid = 0x11
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0
[zk: localhost:2181(CONNECTED) 5] set /zk_test junk
cZxid = 0x11
ctime = Mon Jul 11 21:03:22 KST 2016
mZxid = 0x12
mtime = Mon Jul 11 21:05:11 KST 2016
pZxid = 0x11
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
[zk: localhost:2181(CONNECTED) 6] get /zk_test
junk
cZxid = 0x11
ctime = Mon Jul 11 21:03:22 KST 2016
mZxid = 0x12
mtime = Mon Jul 11 21:05:11 KST 2016
pZxid = 0x11
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
[zk: localhost:2181(CONNECTED) 7] delete /zk_test
[zk: localhost:2181(CONNECTED) 8] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 9]

Reference:
https://zookeeper.apache.org/doc/r3.4.8/zookeeperStarted.html