zookeeper 四字命令的使用

　　 Linux中的命令NetCat有“瑞士军刀”的美誉。我们可以通过nc命令查看Zookeeper的一行属性数据。在Zookeeper中有很多四字命令，汇总如下：

序号	使用命令	输出说明
1	echo conf | nc 10.9.3.253 2181	输出Zookeeper相关服务的详细配置信息，如客户端端口，数据存储路径、最大连接数、日志路径、数据同步端口、主节点推举端口、session超时时间等等
2	echo cons | nc 10.9.3.253 2181	输出连接到Zookeeper的服务器信息，包括队列、数据接收量、数据发送量、sessionID、操作延时、最后的操作信息等等
3	echo crst | nc 10.9.3.253 2181	重置当前的所有连接、会话等等
4	echo dump | nc 10.9.3.253 2181	列出未经处理的会话和连接信息
5	echo envi | nc 10.9.3.253 2181	列出zookeeper的版本信息、主机名称、Java版本、java_home、class_path、服务器名称、当前登陆用户名、目录等等；
6	echo ruok | nc 10.9.3.253 2181	Are You Ok的缩写，测试服务器是否正在运行，如果在运行返回imok，否则返回空
7	echo srst | nc 10.9.3.253 2181	重置Zookeeper的所有统计信息
8	echo srvr | nc 10.9.3.253 2181	列出zookeeper的版本信息、数据接收/发送量、连接数、节点模式、Node数、最大/平均/最小延迟数
9	echo stat | nc 10.9.3.253 2181	列出连接客户端列表、最大/平均/最小延迟数、数据接收/发送量、连接数、节点总数、模式
10	echo wchs | nc 10.9.3.253 2181	列出watch的总数，连接数
11	echo wchp | nc 10.9.3.253 2181	列出所有watch的路径及sessionID
12	echo mntr | nc 10.9.3.253 2181	列出集群的关键性能数据，包括zk的版本、最大/平均/最小延迟数、数据包接收/发送量、连接数、zk角色（Leader/Follower）、node数量、watch数量、临时节点数

　　1、echo conf | nc 10.9.3.253 2181

clientPort=
dataDir=/home/zookeeper/zookeeper-3.4./data/version-
dataLogDir=/home/zookeeper/zookeeper-3.4./data/version-
tickTime=
maxClientCnxns=
minSessionTimeout=
maxSessionTimeout=
serverId=
initLimit=
syncLimit=
electionAlg=
electionPort=
quorumPort=
peerType=

　　2、echo cons | nc 10.9.3.253 2181

 /10.9.3.210:[](queued=,recved=,sent=,sid=0x26128063230003a,lop=PING,est=,to=,lcxid=0x25,lzxid=0x500000e68,lresp=,llat=,minlat=,avglat=,maxlat=)
 /10.9.3.2:[](queued=,recved=,sent=)
 /10.9.3.253:[](queued=,recved=,sent=,sid=0x160e4217689000a,lop=PING,est=,to=,lcxid=0x0,lzxid=0x500000e68,lresp=,llat=,minlat=,avglat=,maxlat=)
 /10.9.3.253:[](queued=,recved=,sent=,sid=0x260e42176ee0005,lop=GETC,est=,to=,lcxid=0xd443,lzxid=0x500000e68,lresp=,llat=,minlat=,avglat=,maxlat=)
 /127.0.0.1:[](queued=,recved=,sent=,sid=0x260e42176ee0534,lop=PING,est=,to=,lcxid=0xf0,lzxid=0x500000e68,lresp=,llat=,minlat=,avglat=,maxlat=)
 /10.9.3.253:[](queued=,recved=,sent=,sid=0x160e42176890009,lop=PING,est=,to=,lcxid=0x5a,lzxid=0x500000e68,lresp=,llat=,minlat=,avglat=,maxlat=)

　　3、echo crst  | nc 10.9.3.253 2181　　

Connection stats reset.

　　4、echo dunp | nc 10.9.3.253 2181

Sessions with Ephemerals ():
0x160e42176890009:
    /hbase/rs/log1,,
0x260e42176ee0005:
    /hbase/master
0x260e42176ee0534:
    /kafka/controller
    /kafka/brokers/ids/
0x26128063230003a:
    /kafka/brokers/ids/

　　5、echo envi |nc 10.9.3.253 2181

nvironment:
zookeeper.version=3.4.--, built on // : GMT
host.name=log1
java.version=1.8.0_102
java.vendor=Oracle Corporation
java.home=/opt/jdk1..0_102/jre
java.class.path=/home/zookeeper/zookeeper-3.4./bin/../build/classes:/home/zookeeper/zookeeper-3.4./bin/../build/lib/*.jar:/home/zookeeper/zookeeper-3.4.8/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/zookeeper/zookeeper-3.4.8/bin/../lib/slf4j-api-1.6.1.jar:/home/zookeeper/zookeeper-3.4.8/bin/../lib/netty-3.7.0.Final.jar:/home/zookeeper/zookeeper-3.4.8/bin/../lib/log4j-1.2.16.jar:/home/zookeeper/zookeeper-3.4.8/bin/../lib/jline-0.9.94.jar:/home/zookeeper/zookeeper-3.4.8/bin/../zookeeper-3.4.8.jar:/home/zookeeper/zookeeper-3.4.8/bin/../src/java/lib/*.jar:/home/zookeeper/zookeeper-3.4.8/bin/../conf:.:/opt/jdk1.8.0_102/lib/dt.jar:/opt/jdk1.8.0_102/lib/tools.jar
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=2.6.32-431.el6.x86_64
user.name=zookeeper
user.home=/home/zookeeper
user.dir=/home/zookeeper/zookeeper-3.4.8/bin

　　6、echo ruok | nc 10.9.3.253 2181

imok

　　7、echo srsr | nc 10.9.3.253 2181　

Server stats reset.

　　8、echo srvr | nc 10.9.3.253 2181

Zookeeper version: 3.4.--, built on // : GMT
Latency min/avg/max: //
Received:
Sent:
Connections:
Outstanding:
Zxid: 0x500000e68
Mode: leader
Node count: 

　　9、echo stat | nc 10.9.3.253 2181

Zookeeper version: 3.4.--, built on // : GMT
Clients:
 /10.9.3.210:[](queued=,recved=,sent=)
 /10.9.3.253:[](queued=,recved=,sent=)
 /10.9.3.253:[](queued=,recved=,sent=)
 /127.0.0.1:[](queued=,recved=,sent=)
 /10.9.3.2:[](queued=,recved=,sent=)
 /10.9.3.253:[](queued=,recved=,sent=)

Latency min/avg/max: //
Received:
Sent:
Connections:
Outstanding:
Zxid: 0x500000e68
Mode: leader
Node count: 

　　10、echo wchs | nc 10.9.3.253 2181

 connections watching  paths
Total watches:

　　11、echo wchp | nc 10.9.3.253 2181

/kafka/brokers/topics/asda
    0x260e42176ee0534
/kafka/controller
    0x260e42176ee0534
    0x26128063230003a
/kafka/isr_change_notification
    0x260e42176ee0534
/kafka/brokers/topics
    0x260e42176ee0534
/hbase/running
    0x260e42176ee0005
    0x160e42176890009
/kafka/brokers/topics/test
    0x260e42176ee0534
/hbase/master
    0x260e42176ee0005
    0x160e42176890009
/kafka/config/changes
    0x260e42176ee0534
    0x26128063230003a
/hbase/namespace
    0x260e42176ee0005
/kafka/brokers/ids
    0x260e42176ee0534
/hbase/namespace/hbase
    0x260e42176ee0005
/kafka/admin/reassign_partitions
    0x260e42176ee0534
/hbase/meta-region-server
    0x160e42176890009
/hbase/rs/log1,,
    0x260e42176ee0005
    0x160e42176890009
/hbase/namespace/default
    0x260e42176ee0005
/hbase/normalizer
    0x260e42176ee0005
/kafka/admin/delete_topics
    0x260e42176ee0534
/hbase/balancer
    0x260e42176ee0005
/kafka/admin/preferred_replica_election
    0x260e42176ee0534

12、echo mntr | nc 10.9.3.253 2181

zk_version    3.4.--, built on // : GMT
zk_avg_latency
zk_max_latency
zk_min_latency
zk_packets_received
zk_packets_sent
zk_num_alive_connections
zk_outstanding_requests
zk_server_state    leader
zk_znode_count
zk_watch_count
zk_ephemerals_count
zk_approximate_data_size
zk_open_file_descriptor_count
zk_max_file_descriptor_count
zk_followers
zk_synced_followers
zk_pending_syncs