ZooKeeper

官网

https://zookeeper.apache.org/

ZooKeeper 介绍、安装

ZooKeeper 架构

ZooKeeper 常用命令

启动命令行客户端连接 ZooKeeper 实例

未指定 host:port 默认连接本地 ZooKeeper 服务

root@ca09cd8f59b4:/opt/zookeeper/bin# ./zkCli.sh
Connecting to localhost:2181
......
[zk: localhost:2181(CONNECTED) 0]

指定 host:port 连接指定 ZooKeeper 服务

root@ca09cd8f59b4:/opt/zookeeper/bin# ./zkCli.sh 192.168.137.201:2121
Connecting to 192.168.137.201:2181
......
[zk: 192.168.137.201:2181(CONNECTED) 0]

查询

查询当前节点下的全部子节点

ls 节点名称

[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 1]

查询当前节点下的数据

[zk: localhost:2181(CONNECTED) 4] get /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
[zk: localhost:2181(CONNECTED) 5]

查询结果第一行是数据

ctime （create time）是创建时间

mtime（modify time）是修改时间

创建节点

create [-s] [-e] Znode名称 Znode数据

-s：sequence，有序节点

-e：ephemeral，临时节点

[zk: localhost:2181(CONNECTED) 5] create /qf xxx
Created /qf
[zk: localhost:2181(CONNECTED) 6] ls /
[qf, zookeeper]
[zk: localhost:2181(CONNECTED) 7] get /qf
xxx
cZxid = 0x6
ctime = Tue Aug 16 01:10:18 UTC 2022
mZxid = 0x6
mtime = Tue Aug 16 01:10:18 UTC 2022
pZxid = 0x6
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 3
numChildren = 0
[zk: localhost:2181(CONNECTED) 8]