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用途：Zookeeper可以通过Four Letter Words自身提供的简写命令来和服务器进行交互
安装：yum install nc
常用命令：
[stat] 查看zk的状态信息，以及是否mode
[root@localhost ~]# echo stat | nc 172.16.1.160 2181
Zookeeper version: 3.4.10-39d3a4f269333c922ed3db283be479f9deacaa0f, built on 03/23/2017 10:13 GMT
Clients:
/172.16.1.160:51288[0](queued=0,recved=1,sent=0)
Latency min/avg/max: 0/0/184
Received: 1455
Sent: 1461
Connections: 1
Outstanding: 0
Zxid: 0x20000001d
Mode: follower
Node count: 11
[ruok] 查看当前zkServer是否启动，返回imok
[root@localhost ~]# echo ruok | nc 172.16.1.160 2181
imok[root@localhost ~]#
[dump] 列出未经吃力的会话和临时节点
[root@localhost ~]# echo dump | nc 172.16.1.160 2181
SessionTracker dump:
org.apache.zookeeper.server.quorum.LearnerSessionTracker@2b249cc7
ephemeral nodes dump:
Sessions with Ephemerals (1):
0x1669eba65330001:
/names/tmp-dump
[conf] 查看服务器配置信息
[root@localhost ~]# echo conf | nc 172.16.1.160 2181
clientPort=2181
dataDir=/root/zookeeper/data/version-2
dataLogDir=/root/zookeeper/logs/version-2
tickTime=2000
maxClientCnxns=60
minSessionTimeout=4000
maxSessionTimeout=40000
serverId=1
initLimit=10
syncLimit=5
electionAlg=3
electionPort=3888
quorumPort=2888
peerType=0
[cons] 展示连接到服务器的客户端信息
[root@localhost ~]# echo cons | nc 172.16.1.160 2181
/172.16.1.160:51308[0](queued=0,recved=1,sent=0)
/127.0.0.1:60184[1](queued=0,recved=29,sent=29,sid=0x1669eba65330001,lop=PING,est=1540277571410,to=30000,lcxid=0x3,lzxid=0xffffffffffffffff,lresp=1540277834135,llat=0,minlat=0,avglat=2,maxlat=67)
[envi] 环境变量
[root@localhost ~]# echo envi | nc 172.16.1.160 2181
Environment:
zookeeper.version=3.4.10-39d3a4f269333c922ed3db283be479f9deacaa0f, built on 03/23/2017 10:13 GMT
host.name=localhost
java.version=1.8.0_181
java.vendor=Oracle Corporation
java.home=/root/jdk1.8.0_181/jre
java.class.path=/root/zookeeper/bin/../build/classes:/root/zookeeper/bin/../build/lib/*.jar:/root/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/root/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/root/zookeeper/bin/../lib/netty-3.10.5.Final.jar:/root/zookeeper/bin/../lib/log4j-1.2.16.jar:/root/zookeeper/bin/../lib/jline-0.9.94.jar:/root/zookeeper/bin/../zookeeper-3.4.10.jar:/root/zookeeper/bin/../src/java/lib/*.jar:/root/zookeeper/bin/../conf:
java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
java.io.tmpdir=/tmp
java.compiler=<NA>
os.name=Linux
os.arch=amd64
os.version=3.10.0-862.el7.x86_64
user.name=root
user.home=/root
user.dir=/root/zookeeper/bin
[mntr] 查看健康信息
[root@localhost ~]# echo mntr | nc 172.16.1.160 2181
zk_version 3.4.10-39d3a4f269333c922ed3db283be479f9deacaa0f, built on 03/23/2017 10:13 GMT
zk_avg_latency 0
zk_max_latency 184
zk_min_latency 0
zk_packets_received 1508
zk_packets_sent 1514
zk_num_alive_connections 2
zk_outstanding_requests 0
zk_server_state follower
zk_znode_count 12
zk_watch_count 0
zk_ephemerals_count 1
zk_approximate_data_size 134
zk_open_file_descriptor_count 34
zk_max_file_descriptor_count 4096
[wchs] 展示watches
[root@localhost ~]# echo wchs | nc 172.16.1.160 2181
0 connections watching 0 paths
Total watches:0