Zookeeper(六)：zookeeper命令
1、连接到zookeeper服务
[root@centos6 ~]# zkCli.sh -server 127.0.0.1:21812、zk命令行工具的一些简单操作如下：
1）、显示根目录下文件
#使用ls命令来查看当前zookeeper中所包含的内容
[zk: 127.0.0.1:2181(CONNECTED) 2] ls /
[storm, hbase, zookeeper]#查看当前节点数据并能看到更新次数等数据
[zk: 127.0.0.1:2181(CONNECTED) 3] ls2 /
[storm, hbase, zookeeper]
cZxid = 0x0
ctime = Thu Jan 01 07:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 07:00:00 CST 1970
pZxid = 0x1100000002
cversion = 1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 3
[zk: 127.0.0.1:2181(CONNECTED) 4]2）、创建文件，并设置初始内容
#创建一个新的znode节点“zk”以及与它关联的字符串
[zk: 127.0.0.1:2181(CONNECTED) 4] create /zk "test4~"
Created /zk
[zk: 127.0.0.1:2181(CONNECTED) 5] ls /
[zk, storm, hbase, zookeeper]
[zk: 127.0.0.1:2181(CONNECTED) 6] create /zk "test01"
Node already exists: /zk
[zk: 127.0.0.1:2181(CONNECTED) 7] ls /
[zk, storm, hbase, zookeeper]
[zk: 127.0.0.1:2181(CONNECTED) 8]3）、获取文件内容
#确认znode是否包含我们所创建的字符串
[zk: 127.0.0.1:2181(CONNECTED) 9] get /zk
"test4~"
cZxid = 0x1800001c42
ctime = Mon Aug 03 14:59:30 CST 2015
mZxid = 0x1800001c42
mtime = Mon Aug 03 14:59:30 CST 2015
pZxid = 0x1800001c42
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 0
[zk: 127.0.0.1:2181(CONNECTED) 10]4）、修改文件内容
#对zk所关联的字符串进行设置
[zk: 127.0.0.1:2181(CONNECTED) 10] set /zk "zkbak"
cZxid = 0x1800001c42
ctime = Mon Aug 03 14:59:30 CST 2015
mZxid = 0x1800001d07
mtime = Mon Aug 03 15:04:52 CST 2015
pZxid = 0x1800001c42
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0
[zk: 127.0.0.1:2181(CONNECTED) 11][zk: 127.0.0.1:2181(CONNECTED) 11] get /zk
"zkbak"
cZxid = 0x1800001c42
ctime = Mon Aug 03 14:59:30 CST 2015
mZxid = 0x1800001d07
mtime = Mon Aug 03 15:04:52 CST 2015
pZxid = 0x1800001c42
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0
[zk: 127.0.0.1:2181(CONNECTED) 12]5）、删除文件
#将刚才创建的znode删除
[zk: 127.0.0.1:2181(CONNECTED) 12] delete /zk
[zk: 127.0.0.1:2181(CONNECTED) 13] ls /
[storm, hbase, zookeeper]
[zk: 127.0.0.1:2181(CONNECTED) 14]6）、退出客户端
[zk: 127.0.0.1:2181(CONNECTED) 15] quit7）、帮助命令
[zk: 127.0.0.1:2181(CONNECTED) 14] help3、zookeeper常用四字命令
如果报-bash: nc: command not found请参考：
linux解决bash: nc: command not found
1）、查看哪个节点被选择作为follower或者leader
[root@datanode1 ~]# echo stat | nc 127.0.0.1 2181
Zookeeper version: 3.4.6-1569965, built on 02/20/2014 09:09 GMT
Clients:
/127.0.0.1:51410[0](queued=0,recved=1,sent=0)
/192.168.57.137:53366[1](queued=0,recved=3740,sent=3740)
Latency min/avg/max: 0/2/1135
Received: 9184
Sent: 9183
Connections: 2
Outstanding: 0
Zxid: 0x1800001e68
Mode: follower
Node count: 29
[root@datanode1 ~]#2）、测试是否启用了该server
#若回复imok表示已经启动
[root@datanode1 ~]# echo ruok|nc 127.0.0.1 2181
imok[root@datanode1 ~]#3）、列出未经处理的会话和临时节点
imok[root@datanode1 ~]# echo dump|nc 127.0.0.1 2181
SessionTracker dump:
org.apache.zookeeper.server.quorum.LearnerSessionTracker@7c6faeb8
ephemeral nodes dump:
Sessions with Ephemerals (3):
0x34ef173456d0006:
/storm/supervisors/1f53140e-f9fe-43e3-841d-4ef92fd862f4
0x14ef17333560003:
/storm/supervisors/2ee21b72-3291-41f8-857c-ed8a3a8a70c7
0x34ef173456d0005:
/storm/supervisors/56fa3c25-82c2-46ff-919c-7fbc16d6345d
[root@datanode1 ~]#4）、关掉server
[root@datanode1 ~]# echo kill | nc 127.0.0.1 1281
[root@datanode1 ~]#5）、列出相关服务配置的详细信息
[root@datanode1 ~]# echo conf | nc 127.0.0.1 2181
clientPort=2181
dataDir=/home/hadoop/modules/zookeeper-data/data/version-2
dataLogDir=/home/hadoop/modules/zookeeper-data/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
[root@datanode1 ~]#6）、列出所有连接到服务器的客户端的完全的连接 / 会话的详细信息
[root@datanode1 ~]# echo cons | nc 127.0.0.1 2181
/127.0.0.1:51415[0](queued=0,recved=1,sent=0)
/192.168.57.137:53366[1](queued=0,recved=4300,sent=4300,sid=0x14ef17333560003,lop=SETD,est=1438580726687,to=20000,lcxid=0x10c9,lzxid=0x1800002047,lresp=1438586879981,llat=2,minlat=0,avglat=4,maxlat=1101)
[root@datanode1 ~]#7）、输出关于服务环境的详细信息（区别于 conf 命令）
[root@datanode1 ~]# echo envi | nc 127.0.0.1 2181
Environment:
zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
host.name=datanode1
java.version=1.7.0_67
java.vendor=Oracle Corporation
java.home=/usr/java/jdk1.7.0_67/jre
java.class.path=/home/hadoop/modules/zookeeper/bin/../build/classes:/home/hadoop/modules/zookeeper/bin/../build/lib/*.jar:/home/hadoop/modules/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/hadoop/modules/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/home/hadoop/modules/zookeeper/bin/../lib/netty-3.7.0.Final.jar:/home/hadoop/modules/zookeeper/bin/../lib/log4j-1.2.16.jar:/home/hadoop/modules/zookeeper/bin/../lib/jline-0.9.94.jar:/home/hadoop/modules/zookeeper/bin/../zookeeper-3.4.6.jar:/home/hadoop/modules/zookeeper/bin/../src/java/lib/*.jar:/home/hadoop/modules/zookeeper/bin/../conf:.:/usr/java/jdk1.7.0_67//lib/tools.jar
java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
java.io.tmpdir=/tmp
java.compiler=
os.name=Linux
os.arch=amd64
os.version=2.6.32-431.el6.x86_64
user.name=root
user.home=/root
user.dir=/root
[root@datanode1 ~]# 8）、列出未经处理的请求
[root@datanode1 ~]# echo reqs | nc 127.0.0.1 2181
[root@datanode1 ~]#9）、列出服务器 watch 的详细信息
[root@datanode1 ~]# echo wchs | nc 127.0.0.1 2181
0 connections watching 0 paths
Total watches:0
[root@datanode1 ~]#10）、通过 session 列出服务器 watch 的详细信息，它的输出是一个与 watch 相关的会话的列表
[root@datanode1 ~]# echo wchc | nc 127.0.0.1 2181
[root@datanode1 ~]#11）、通过路径列出服务器 watch 的详细信息
它输出一个与session相关的路径。
[root@datanode1 ~]# echo wchp | nc 127.0.0.1 2181
[root@datanode1 ~]#