【Zookeeper】Re01 安装与操作

Zookeeper基于JDK开发出来的

运行环境至少需要JRE

快速安装JDK：

yum install -y java-1.8.0-openjdk-devel.x86_64 

# ZK镜像仓库

https://downloads.apache.org/zookeeper/

# 下载 *.bin.tar.gz包

wget https://downloads.apache.org/zookeeper/zookeeper-3.7.0/apache-zookeeper-3.7.0-bin.tar.gz

# 解压包

tar -zxvf apache-zookeeper-3.7.0-bin.tar.gz

# 将解压出来的目录复制到 /usr/local/下 （可选）

cp -r /root/apache-zookeeper-3.7.0-bin /usr/local/

# 将ZK备份的配置文件复制一份重命名为zoo.cfg

cp /usr/local/apache-zookeeper-3.7.0-bin/conf/zoo_sample.cfg /usr/local/apache-zookeeper-3.7.0-bin/conf/zoo.cfg

# 启动ZK，停止ZK

/usr/local/apache-zookeeper-3.7.0-bin/bin/zkServer.sh start
/usr/local/apache-zookeeper-3.7.0-bin/bin/zkServer.sh stop

# 查看ZK状态

/usr/local/apache-zookeeper-3.7.0-bin/bin/zkServer.sh status

# 启动ZK失败，查看日志信息

cat /usr/local/apache-zookeeper-3.7.0-bin/logs/zookeeper-root-server-localhost.localdomain.out

一般情况是8080端口占用，杀死该占用进程就好了

netstat -lntp | grep 8080

kill -9 8080端口的进程号

服务器基本操作命令：

# 启动ZK，停止ZK 重启ZK
/usr/local/apache-zookeeper-3.7.0-bin/bin/zkServer.sh start
/usr/local/apache-zookeeper-3.7.0-bin/bin/zkServer.sh stop
/usr/local/apache-zookeeper-3.7.0-bin/bin/zkServer.sh restart

# 查看ZK状态
/usr/local/apache-zookeeper-3.7.0-bin/bin/zkServer.sh status

顺便设置开机自启动：

试了一下，并不会开启。。。

vim /etc/rc.local
/usr/local/apache-zookeeper-3.7.0-bin/bin/zkServer.sh start

登陆 与 退出 ZK

# 登陆ZK
/usr/local/apache-zookeeper-3.7.0-bin/bin/zkCli.sh -server localhost:2181

# 退出ZK
quit

展示根节点信息：

[zk: localhost:2181(CONNECTED) 1] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 2]

ZK节点信息：

[zk: localhost:2181(CONNECTED) 2] ls /zookeeper
[config, quota]
[zk: localhost:2181(CONNECTED) 3] 

创建节点（可连子节点）和数据

[zk: localhost:2181(CONNECTED) 3] create /sample aaa
Created /sample
[zk: localhost:2181(CONNECTED) 4] create /sample2
Created /sample2
[zk: localhost:2181(CONNECTED) 5]

# 创建临时节点

create -e /tempNode

# 创建持久化顺序节点

create -s /persistSortNode

# 创建临时顺序节点

create -s /tempSortNode

对已经存在的节点设置数据

[zk: localhost:2181(CONNECTED) 5] set /sample bbb
[zk: localhost:2181(CONNECTED) 6]

获取节点上的数据，无数据则返回NULL

[zk: localhost:2181(CONNECTED) 7] get /sample
bbb

删除节点（该节点包含后代节点则不能删除）

[zk: localhost:2181(CONNECTED) 20] delete /sample
[zk: localhost:2181(CONNECTED) 21] 

删除节点（包括后代节点一并删除）

[zk: localhost:2181(CONNECTED) 20] deleteall /sample
[zk: localhost:2181(CONNECTED) 21] 

创建顺序的持久化节点：

会自动在后面补上连号

[zk: localhost:2181(CONNECTED) 9] create -s /sequenNode
Created /sequenNode0000000002
[zk: localhost:2181(CONNECTED) 10] create -s /sequenNode
Created /sequenNode0000000003
[zk: localhost:2181(CONNECTED) 11] create -s /sequenNode
Created /sequenNode0000000004
[zk: localhost:2181(CONNECTED) 12] create -s /sequenNode
Created /sequenNode0000000005
[zk: localhost:2181(CONNECTED) 13] create -s /sequenNode
Created /sequenNode0000000006
[zk: localhost:2181(CONNECTED) 14] create -s /sequenNode
Created /sequenNode0000000007
[zk: localhost:2181(CONNECTED) 15] create -s /sequenNode
Created /sequenNode0000000008
[zk: localhost:2181(CONNECTED) 16] create -s /sequenNode
Created /sequenNode0000000009

展示节点的详细信息：

[zk: localhost:2181(CONNECTED) 22] ls -s /
[sample2, sequenNode0000000002, sequenNode0000000003, sequenNode0000000004, sequenNode0000000005, sequenNode0000000006, sequenNode0000000007, sequenNode0000000008, sequenNode0000000009, zookeeper]
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0xe
cversion = 10
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 10
[zk: localhost:2181(CONNECTED) 23]