需要用到zookeeper来生成分布式id,故对zookeeper进行学习
安装参考链接https://cloud.tencent.com/developer/article/1497030
启动zk服务
./zkServer.sh start
[root@localhost bin]# ./zkServer.sh
ZooKeeper JMX enabled by default
Using config: /usr/home/zookeeper-3.4.11/bin/../conf/zoo.cfg
Usage: ./zkServer.sh {start|start-foreground|stop|restart|status|upgrade|print-cmd}
# 提示要以./zkCli.sh start 启动zk
./zkCli.sh start
查看zk的运行状态
./zkServer.sh status
由于我已经配置了zk
的集群,所以此处显示状态为leader
[root@localhost bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /usr/home/zookeeper-3.4.11/bin/../conf/zoo.cfg
Mode: leader
客户端链接zk
[root@localhost bin]# ./zkCli.sh
......
WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0]
help 查看客户端帮助命令
help
[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 查看
ls
查看命令(niocoder
是我测试集群创建的节点,默认只有zookeeper
一个节点)[zk: localhost:2181(CONNECTED) 1] ls /
[niocoder, zookeeper]
[zk: localhost:2181(CONNECTED) 2] ls /zookeeper
[quota]
[zk: localhost:2181(CONNECTED) 4] ls /zookeeper/quota
[]
get 获取节点数据和更新信息
get
内容为空Transaction id
, 该id称为zxid. 由于zxid的递增性质, 如果zxid1小于zxid2, 那么zxid1肯定先于zxid2发生. 创建任意节点, 或者更新任意节点的数据, 或者删除任意节点, 都会导致Zookeeper状态发生改变, 从而导致zxid的值增加。[zk: localhost:2181(CONNECTED) 7] get /zookeeper #下面空行说明节点内容为空
cZxid = 0x0
ctime = Thu Jan 01 00:00:00 UTC 1970
mZxid = 0x0
mtime = Thu Jan 01 00:00:00 UTC 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1
[zk: localhost:2181(CONNECTED) 8]
stat 获得节点的更新信息
stat
[zk: localhost:2181(CONNECTED) 8] stat /zookeeper
cZxid = 0x0
ctime = Thu Jan 01 00:00:00 UTC 1970
mZxid = 0x0
mtime = Thu Jan 01 00:00:00 UTC 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1
ls2 ls命令和stat命令的整合
ls2
[zk: localhost:2181(CONNECTED) 10] ls2 /zookeeper
[quota]
cZxid = 0x0
ctime = Thu Jan 01 00:00:00 UTC 1970
mZxid = 0x0
mtime = Thu Jan 01 00:00:00 UTC 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1
[zk: localhost:2181(CONNECTED) 11]
create 创建节点
create [-s] [-e] path data acl
可以注意一下各个版本的变化#创建merryyou节点,节点的内容为merryyou
[zk: localhost:2181(CONNECTED) 1] create /merryyou merryyou
Created /merryyou
#获得merryyou节点内容
[zk: localhost:2181(CONNECTED) 3] get /merryyou
merryyou
cZxid = 0x200000004
ctime = Sat Jun 02 14:20:06 UTC 2018
mZxid = 0x200000004
mtime = Sat Jun 02 14:20:06 UTC 2018
pZxid = 0x200000004
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 0
create -e 创建临时节点
create -e
#创建临时节点
[zk: localhost:2181(CONNECTED) 4] create -e /merryyou/temp merryyou
Created /merryyou/temp
[zk: localhost:2181(CONNECTED) 5] get /merryyou
merryyou
cZxid = 0x200000004
ctime = Sat Jun 02 14:20:06 UTC 2018
mZxid = 0x200000004
mtime = Sat Jun 02 14:20:06 UTC 2018
pZxid = 0x200000005
cversion = 1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 1
[zk: localhost:2181(CONNECTED) 6] get /merryyou/temp
merryyou
cZxid = 0x200000005
ctime = Sat Jun 02 14:22:24 UTC 2018
mZxid = 0x200000005
mtime = Sat Jun 02 14:22:24 UTC 2018
pZxid = 0x200000005
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x2000000d4500000
dataLength = 8
numChildren = 0
[zk: localhost:2181(CONNECTED) 7]
#断开重连之后,临时节点自动消失
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
#因为默认的心跳机制,此时查询临时节点还存在
[zk: localhost:2181(CONNECTED) 0] ls /merryyou
[temp]
#再次查询,临时节点消失
[zk: localhost:2181(CONNECTED) 1] ls /merryyou
[]
[zk: localhost:2181(CONNECTED) 2]
create -s 创建顺序节点 自动累加
create -s
# 创建顺序节点,顺序节点会自动累加
[zk: localhost:2181(CONNECTED) 2] create -s /merryyou/sec seq
Created /merryyou/sec0000000001
[zk: localhost:2181(CONNECTED) 3] create -s /merryyou/sec seq
Created /merryyou/sec0000000002
set path data version 修改节点
[zk: localhost:2181(CONNECTED) 6] get /merryyou
merryyou
cZxid = 0x200000004
ctime = Sat Jun 02 14:20:06 UTC 2018
mZxid = 0x200000004
mtime = Sat Jun 02 14:20:06 UTC 2018
pZxid = 0x200000009
cversion = 4
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 2
# 修改节点内容为new-merryyou
[zk: localhost:2181(CONNECTED) 7] set /merryyou new-merryyou
cZxid = 0x200000004
ctime = Sat Jun 02 14:20:06 UTC 2018
mZxid = 0x20000000a
mtime = Sat Jun 02 14:29:23 UTC 2018
pZxid = 0x200000009
cversion = 4
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 12
numChildren = 2
#再次查询,节点内容已经修改
[zk: localhost:2181(CONNECTED) 8] get /merryyou
new-merryyou
cZxid = 0x200000004
ctime = Sat Jun 02 14:20:06 UTC 2018
mZxid = 0x20000000a
mtime = Sat Jun 02 14:29:23 UTC 2018
pZxid = 0x200000009
cversion = 4
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 12
numChildren = 2
#set 根据版本号更新 dataVersion 乐观锁
[zk: localhost:2181(CONNECTED) 9] set /merryyou test-merryyou 1
cZxid = 0x200000004
ctime = Sat Jun 02 14:20:06 UTC 2018
mZxid = 0x20000000b
mtime = Sat Jun 02 14:31:30 UTC 2018
pZxid = 0x200000009
cversion = 4
dataVersion = 2
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 13
numChildren = 2
#因为数据的版本号已经修改为2 再次使用版本号1修改节点提交错误
[zk: localhost:2181(CONNECTED) 10] set /merryyou test-merryyou 1
version No is not valid : /merryyou
delete path version 删除节点
[zk: localhost:2181(CONNECTED) 13] delete /merryyou/sec000000000
sec0000000001 sec0000000002
[zk: localhost:2181(CONNECTED) 13] delete /merryyou/sec0000000001
[zk: localhost:2181(CONNECTED) 14] ls /merryyou
[sec0000000002]
[zk: localhost:2181(CONNECTED) 15]
#版本号操作与set类似 version
关于watcher
机制大体的理解可以为,当每个节点发生变化,都会触发watcher
事件,类似于mysql
的触发器。zk
中 watcher
是一次性的,触发后立即销毁。可以参考https://blog.csdn.net/hohoo1990/article/details/78617336
stat path [watch]
设置watch事件get path [watch]
设置watch事件stat path watch 设置watch事件
#添加watch 事件
[zk: localhost:2181(CONNECTED) 18] stat /longfei watch
Node does not exist: /longfei
#创建longfei节点时触发watcher事件
[zk: localhost:2181(CONNECTED) 19] create /longfei test
WATCHER::
WatchedEvent state:SyncConnected type:NodeCreated path:/longfei
Created /longfei
get path watch 设置watch事件
#使用get命令添加watch事件
[zk: localhost:2181(CONNECTED) 20] get /longfei watch
test
cZxid = 0x20000000e
ctime = Sat Jun 02 14:43:15 UTC 2018
mZxid = 0x20000000e
mtime = Sat Jun 02 14:43:15 UTC 2018
pZxid = 0x20000000e
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
#修改节点触发watcher事件
[zk: localhost:2181(CONNECTED) 21] set /longfei new_test
WATCHER::
WatchedEvent state:SyncConnected type:NodeDataChanged path:/longfei
cZxid = 0x20000000e
ctime = Sat Jun 02 14:43:15 UTC 2018
mZxid = 0x20000000f
mtime = Sat Jun 02 14:45:06 UTC 2018
pZxid = 0x20000000e
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 0
[zk: localhost:2181(CONNECTED) 22]
#删除触发watcher事件
[zk: localhost:2181(CONNECTED) 23] get /longfei watch
new_test
cZxid = 0x20000000e
ctime = Sat Jun 02 14:43:15 UTC 2018
mZxid = 0x20000000f
mtime = Sat Jun 02 14:45:06 UTC 2018
pZxid = 0x20000000e
cversion = 0
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 8
numChildren = 0
[zk: localhost:2181(CONNECTED) 24] delete /longfei
WATCHER::
WatchedEvent state:SyncConnected type:NodeDeleted path:/longfei
[zk: localhost:2181(CONNECTED) 25]
ZK的节点有5种操作权限:CREATE
、READ
、WRITE
、DELETE
、ADMIN
也就是 增、删、改、查、管理权限,这5种权限简写为crwda
(即:每个单词的首字符缩写)。 注:这5种权限中,delete是指对子节点的删除权限,其它4种权限指对自身节点的操作权限
身份的认证有4种方式:
world
:默认方式,相当于全世界都能访问auth
:代表已经认证通过的用户(cli中可以通过addauth digest user:pwd 来添加当前上下文中的授权用户)digest
:即用户名:密码这种方式认证,这也是业务系统中最常用的ip
:使用Ip地址认证使用[scheme:id:permissions]
来表示acl权限
getAcl:获取某个节点的acl权限信息
#获取节点权限信息默认为 world:cdrwa任何人都可以访问
[zk: localhost:2181(CONNECTED) 34] getAcl /merryyou
'world,'anyone
: cdrwa
[zk: localhost:2181(CONNECTED) 35]
setAcl 设置权限
[zk: localhost:2181(CONNECTED) 35] create /merryyou/test test
Created /merryyou/test
[zk: localhost:2181(CONNECTED) 36] getAcl /merryyou/test
'world,'anyone
: cdrwa
#设置节点权限 crwa 不允许删除
[zk: localhost:2181(CONNECTED) 37] setAcl /merryyou/test world:anyone:crwa
cZxid = 0x200000018
ctime = Sat Jun 02 16:18:18 UTC 2018
mZxid = 0x200000018
mtime = Sat Jun 02 16:18:18 UTC 2018
pZxid = 0x200000018
cversion = 0
dataVersion = 0
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
#查询刚才设置的acl权限信息 crwa 没有删除权限
[zk: localhost:2181(CONNECTED) 38] getAcl /merryyou/test
'world,'anyone
: crwa
[zk: localhost:2181(CONNECTED) 39]
[zk: localhost:2181(CONNECTED) 39] create /merryyou/test/abc abc
Created /merryyou/test/abc
#删除子节点的时候提交权限不足
[zk: localhost:2181(CONNECTED) 40] delete /merryyou/test/abc
Authentication is not valid : /merryyou/test/abc
#设置节点的权限信息为rda
[zk: localhost:2181(CONNECTED) 41] setAcl /merryyou/test world:anyone:rda
cZxid = 0x200000018
ctime = Sat Jun 02 16:18:18 UTC 2018
mZxid = 0x200000018
mtime = Sat Jun 02 16:18:18 UTC 2018
pZxid = 0x20000001a
cversion = 1
dataVersion = 0
aclVersion = 2
ephemeralOwner = 0x0
dataLength = 4
numChildren = 1
[zk: localhost:2181(CONNECTED) 42] getAcl /merryyou/test
'world,'anyone
: dra
#可以成功删除
[zk: localhost:2181(CONNECTED) 43] delete /merryyou/test/abc
[zk: localhost:2181(CONNECTED) 46] ls /merryyou/test
[]
[zk: localhost:2181(CONNECTED) 47]
#设置节点信息为a admin
[zk: localhost:2181(CONNECTED) 47] setAcl /merryyou/test world:anyone:a
cZxid = 0x200000018
ctime = Sat Jun 02 16:18:18 UTC 2018
mZxid = 0x200000018
mtime = Sat Jun 02 16:18:18 UTC 2018
pZxid = 0x20000001d
cversion = 2
dataVersion = 0
aclVersion = 3
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
#获取 设置都提示权限不足
[zk: localhost:2181(CONNECTED) 49] get /merryyou/test
Authentication is not valid : /merryyou/test
[zk: localhost:2181(CONNECTED) 50] set /merryyou/test 123
Authentication is not valid : /merryyou/test
[zk: localhost:2181(CONNECTED) 51]
acl Auth 密码明文设置
[zk: localhost:2181(CONNECTED) 53] create /niocoder/merryyou merryyou
Created /niocoder/merryyou
#查询默认节点权限信息
[zk: localhost:2181(CONNECTED) 54] getAcl /niocoder/merryyou
'world,'anyone
: cdrwa
[zk: localhost:2181(CONNECTED) 55]
#使用auth设置节点权限信息
[zk: localhost:2181(CONNECTED) 2] setAcl /niocoder/merryyou auth:test:test:cdrwa
Acl is not valid : /niocoder/merryyou
# 注册test:test 账号密码
[zk: localhost:2181(CONNECTED) 3] addauth digest test:test
[zk: localhost:2181(CONNECTED) 4] setAcl /niocoder/merryyou auth:test:test:cdrwa
cZxid = 0x200000020
ctime = Sat Jun 02 16:32:08 UTC 2018
mZxid = 0x200000020
mtime = Sat Jun 02 16:32:08 UTC 2018
pZxid = 0x200000020
cversion = 0
dataVersion = 0
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 8
numChildren = 0
#查询节点权限信息 密码为密文格式
[zk: localhost:2181(CONNECTED) 5] getAcl /niocoder/merryyou
'digest,'test:V28q/NynI4JI3Rk54h0r8O5kMug=
: cdrwa
[zk: localhost:2181(CONNECTED) 6]
acl digest 密码密文设置
[zk: localhost:2181(CONNECTED) 13] create /names test
Created /names
[zk: localhost:2181(CONNECTED) 14] getAcl /names
'world,'anyone
: cdrwa
#使用digest设置节点的权限信息 密码为test密文
[zk: localhost:2181(CONNECTED) 15] setAcl /names digest:test:V28q/NynI4JI3Rk54h0r8O5kMug=:cdra
cZxid = 0x400000006
ctime = Sun Jun 03 01:01:17 UTC 2018
mZxid = 0x400000006
mtime = Sun Jun 03 01:01:17 UTC 2018
pZxid = 0x400000006
cversion = 0
dataVersion = 0
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
#查询节点权限信息
[zk: localhost:2181(CONNECTED) 16] getAcl /names
'digest,'test:V28q/NynI4JI3Rk54h0r8O5kMug=
: cdra
#获取节点信息提示权限不足
[zk: localhost:2181(CONNECTED) 5] get /names
Authentication is not valid : /names
# 注册账户
[zk: localhost:2181(CONNECTED) 4] addauth digest test:test
# 可以正常获取
[zk: localhost:2181(CONNECTED) 17] get /names
test
cZxid = 0x400000006
ctime = Sun Jun 03 01:01:17 UTC 2018
mZxid = 0x400000006
mtime = Sun Jun 03 01:01:17 UTC 2018
pZxid = 0x400000006
cversion = 0
dataVersion = 0
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 4
numChildren = 0
#由于没有设置写权限不能修改节点 w
[zk: localhost:2181(CONNECTED) 18] set /names 111
Authentication is not valid : /names
[zk: localhost:2181(CONNECTED) 19] delete /names
[zk: localhost:2181(CONNECTED) 20]
acl ip 控制客户端
[zk: localhost:2181(CONNECTED) 22] create /niocoder/ip aa
Created /niocoder/ip
[zk: localhost:2181(CONNECTED) 23] get /niocoder/ip
aa
cZxid = 0x40000000a
ctime = Sun Jun 03 01:06:47 UTC 2018
mZxid = 0x40000000a
mtime = Sun Jun 03 01:06:47 UTC 2018
pZxid = 0x40000000a
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 2
numChildren = 0
# 添加ip控制的权限信息
[zk: localhost:2181(CONNECTED) 24] setAcl /niocoder/ip ip:192.168.0.68:cdrwa
cZxid = 0x40000000a
ctime = Sun Jun 03 01:06:47 UTC 2018
mZxid = 0x40000000a
mtime = Sun Jun 03 01:06:47 UTC 2018
pZxid = 0x40000000a
cversion = 0
dataVersion = 0
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 2
numChildren = 0
[zk: localhost:2181(CONNECTED) 25] getAcl /niocoder/ip
'ip,'192.168.0.68
: cdrwa
[zk: localhost:2181(CONNECTED) 26]
acl super超级管理员
使用super
权限需要修改zkServer.sh
,添加super
管理员,重启zkServer.sh
假设这个超管是:super:admin,通过代码得到其哈希值:
String m = DigestAuthenticationProvider.generateDigest("super:admin");
m是:super:xQJmxLMiHGwaqBvst5y6rkB6HQs=
那么打开zk目录下的/bin/zkServer.sh服务器脚本文件,找到如下一行:
nohup $JAVA "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}"
这就是脚本中启动zk的命令,默认只有以上两个配置项,我们需要加一个超管的配置项:
"-Dzookeeper.DigestAuthenticationProvider.superDigest=super:xQJmxLMiHGwaqBvst5y6rkB6HQs="
第一个等号之后的就是刚才用户名密码的哈希值。
那么修改以后这条完整命令变成了:
nohup $JAVA "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" "-Dzookeeper.DigestAuthenticationProvider.superDigest=super:xQJmxLMiHGwaqBvst5y6rkB6HQs="\
`-cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG" > "$_ZOO_DAEMON_OUT" 2>&1 < /dev/null &`
之后启动zk
输入如下命令添加权限:
addauth digest super:admin
"-Dzookeeper.DigestAuthenticationProvider.superDigest=test:V28q/NynI4JI3Rk54h0r8O5kMug="
nohup "$JAVA" "-Dzookeeper.log.dir=${ZOO_LOG_DIR}" "-Dzookeeper.root.logger=${ZOO_LOG4J_PROP}" "-Dzookeeper.DigestAuthenticationprovider.superDigest=test:V28q/NynI4JI3Rk54h0r8O5kMug=" \
-cp "$CLASSPATH" $JVMFLAGS $ZOOMAIN "$ZOOCFG" > "$_ZOO_DAEMON_OUT" 2>&1 < /dev/null &
#重启进入zkCli
#由于之前设置ip权限,所以不允许访问
[zk: localhost:2181(CONNECTED) 2] ls /niocoder/ip
Authentication is not valid : /niocoder/ip
#登录账号信息,即为管理员账号
[zk: localhost:2181(CONNECTED) 3] addauth digest test:test
#正常访问,节点内容为空
[zk: localhost:2181(CONNECTED) 4] ls /niocoder/ip
[]
[zk: localhost:2181(CONNECTED) 5] get /niocoder/ip
aa
cZxid = 0x40000000a
ctime = Sun Jun 03 01:06:47 UTC 2018
mZxid = 0x40000000a
mtime = Sun Jun 03 01:06:47 UTC 2018
pZxid = 0x40000000a
cversion = 0
dataVersion = 0
aclVersion = 1
ephemeralOwner = 0x0
dataLength = 2
numChildren = 0
[zk: localhost:2181(CONNECTED) 6]
https://www.cnblogs.com/kuku0223/p/8428341.html
conf is not executed because it is not in the whitelist 使用四字命令报错
进入zookeeper的zoo.cfg,修改
#开启四字命令 4lw.commands.whitelist=*
或者安装**nc
**命令,(**yum install nc
**)
stat 查看状态信息
[root@localhost bin]# echo stat | nc 192.168.0.68 2181
Zookeeper version: 3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
Clients:
/192.168.0.68:49346[0](queued=0,recved=1,sent=0)
Latency min/avg/max: 0/0/4
Received: 62
Sent: 61
Connections: 1
Outstanding: 0
Zxid: 0x50000000a
Mode: follower
Node count: 10
[root@localhost bin]#
ruok 查看zookeeper是否启动
[root@localhost bin]# echo ruok | nc 192.168.0.68 2181
imok[root@localhost bin]#
dump 列出没有处理的节点,临时节点
imok[root@localhost bin]# echo dump | nc 192.168.0.68 2181
SessionTracker dump:
org.apache.zookeeper.server.quorum.LearnerSessionTracker@29805957
ephemeral nodes dump:
Sessions with Ephemerals (0):
[root@localhost bin]#
conf 查看服务器配置
[root@localhost bin]# echo conf | nc 192.168.0.68 2181
clientPort=2181
dataDir=/usr/home/zookeeper-3.4.11/data/version-2
dataLogDir=/usr/home/zookeeper-3.4.11/data/version-2
tickTime=2000
maxClientCnxns=60
minSessionTimeout=4000
maxSessionTimeout=40000
serverId=2
initLimit=10
syncLimit=5
electionAlg=3
electionPort=3888
quorumPort=2888
peerType=0
[root@localhost bin]#
cons 显示连接到服务端的信息
[root@localhost bin]# echo cons | nc 192.168.0.68 2181
/192.168.0.68:49354[0](queued=0,recved=1,sent=0)
[root@localhost bin]#
envi 显示环境变量信息
[root@localhost bin]# echo envi | nc 192.168.0.68 2181
Environment:
zookeeper.version=3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
host.name=localhost
java.version=1.8.0_111
java.vendor=Oracle Corporation
java.home=/usr/local/jdk1.8.0_111/jre
java.class.path=/usr/home/zookeeper-3.4.11/bin/../build/classes:/usr/home/zookeeper-3.4.11/bin/../build/lib/*.jar:/usr/home/zookeeper-3.4.11/bin/../lib/slf4j-log4j12-1.6.1.jar:/usr/home/zookeeper-3.4.11/bin/../lib/slf4j-api-1.6.1.jar:/usr/home/zookeeper-3.4.11/bin/../lib/netty-3.10.5.Final.jar:/usr/home/zookeeper-3.4.11/bin/../lib/log4j-1.2.16.jar:/usr/home/zookeeper-3.4.11/bin/../lib/jline-0.9.94.jar:/usr/home/zookeeper-3.4.11/bin/../lib/audience-annotations-0.5.0.jar:/usr/home/zookeeper-3.4.11/bin/../zookeeper-3.4.11.jar:/usr/home/zookeeper-3.4.11/bin/../src/java/lib/*.jar:/usr/home/zookeeper-3.4.11/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=3.10.0-514.10.2.el7.x86_64
user.name=root
user.home=/root
user.dir=/usr/home/zookeeper-3.4.11/bin
[root@localhost bin]#
mntr 查看zk的健康信息
[root@localhost bin]# echo mntr | nc 192.168.0.68 2181
zk_version 3.4.11-37e277162d567b55a07d1755f0b31c32e93c01a0, built on 11/01/2017 18:06 GMT
zk_avg_latency 0
zk_max_latency 4
zk_min_latency 0
zk_packets_received 68
zk_packets_sent 67
zk_num_alive_connections 1
zk_outstanding_requests 0
zk_server_state follower
zk_znode_count 10
zk_watch_count 0
zk_ephemerals_count 0
zk_approximate_data_size 124
zk_open_file_descriptor_count 32
zk_max_file_descriptor_count 4096
[root@localhost bin]#
wchs 展示watch的信息
[root@localhost bin]# echo wchs | nc 192.168.0.68 2181
0 connections watching 0 paths
Total watches:0
[root@localhost bin]#
wchc和wchp 显示session的watch信息 path的watch信息
zoo.cfg
文件中添加 4lw.commands.whitelist=*
[root@localhost bin]# echo wchc | nc 192.168.0.68 2181
wchc is not executed because it is not in the whitelist.
[root@localhost bin]# echo wchp | nc 192.168.0.68 2181
wchp is not executed because it is not in the whitelist.
熟悉zookeeper
基础命令操作后,再使用zookeeper
提供的api
或者第三方封装的api
,会感觉一目了然。