zookeeper的探活

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网络安全专家 2024-11-26 19:37:55

文章标签 zookeeper的探活 java-zookeeper zookeeper linux hadoop 文章分类 运维

3.1 分布式安装部署

1）集群规划
在hadoop102、hadoop103和hadoop104三个节点上部署Zookeeper。
2）解压安装
（1）解压Zookeeper安装包到/opt/module/目录下
[sancheng@hadoop102 software]$ tar -zxvf zookeeper-3.5.7.tar.gz -C /opt/module/
（2）同步/opt/module/zookeeper-3.5.7目录内容到hadoop103、hadoop104
[sancheng@hadoop102 module]$ xsync zookeeper-3.5.7/
3）配置服务器编号
（1）在/opt/module/zookeeper-3.5.7/这个目录下创建zkData
[sancheng@hadoop102 zookeeper-3.5.7]$ mkdir -p zkData
（2）在/opt/module/zookeeper-3.5.7/zkData目录下创建一个myid的文件
[sancheng@hadoop102 zkData]$ touch myid
添加myid文件，注意一定要在linux里面创建，在notepad++里面很可能乱码
（3）编辑myid文件
[sancheng@hadoop102 zkData]$ vi myid
在文件中添加与server对应的编号：
2
（4）拷贝配置好的zookeeper到其他机器上
[sancheng@hadoop102 zkData]$ xsync myid
并分别在hadoop103、hadoop104上修改myid文件中内容为3、4
4）配置zoo.cfg文件
（1）重命名/opt/module/zookeeper-3.5.7/conf这个目录下的zoo_sample.cfg为zoo.cfg
[sancheng@hadoop102 conf]$ mv zoo_sample.cfg zoo.cfg
（2）打开zoo.cfg文件
[sancheng@hadoop102 conf]$ vim zoo.cfg
修改数据存储路径配置
dataDir=/opt/module/zookeeper-3.5.7/zkData
增加如下配置
#######################cluster##########################
server.2=hadoop102:2888:3888
server.3=hadoop103:2888:3888
server.4=hadoop104:2888:3888
（3）同步zoo.cfg配置文件
[sancheng@hadoop102 conf]$ xsync zoo.cfg
（4）配置参数解读
server.A=B:C:D。
A是一个数字，表示这个是第几号服务器；
集群模式下配置一个文件myid，这个文件在dataDir目录下，这个文件里面有一个数据就是A的值，Zookeeper启动时读取此文件，拿到里面的数据与zoo.cfg里面的配置信息比较从而判断到底是哪个server。
B是这个服务器的地址；
C是这个服务器Follower与集群中的Leader服务器交换信息的端口；
D是万一集群中的Leader服务器挂了，需要一个端口来重新进行选举，选出一个新的Leader，而这个端口就是用来执行选举时服务器相互通信的端口。
5）集群操作
（1）分别启动Zookeeper
[sancheng@hadoop102 zookeeper-3.5.7]$ bin/zkServer.sh start
[sancheng@hadoop103 zookeeper-3.5.7]$ bin/zkServer.sh start
[sancheng@hadoop104 zookeeper-3.5.7]$ bin/zkServer.sh start
（2）查看状态
[sancheng@hadoop102 zookeeper-3.5.7]# bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.5.7/bin/…/conf/zoo.cfg
Mode: follower
[sancheng@hadoop103 zookeeper-3.5.7]# bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.5.7/bin/…/conf/zoo.cfg
Mode: leader
[sancheng@hadoop104 zookeeper-3.5.7]# bin/zkServer.sh status
JMX enabled by default
Using config: /opt/module/zookeeper-3.5.7/bin/…/conf/zoo.cfg
Mode: follower

3.2 客户端命令行操作

命令基本语法功能描述
help 显示所有操作命令
ls path 使用 ls 命令来查看当前znode的子节点
-w 监听子节点变化
-s 附加次级信息
create 普通创建
-s 含有序列
-e 临时（重启或者超时消失）
get path 获得节点的值
-w 监听节点内容变化
-s 附加次级信息
set 设置节点的具体值
stat 查看节点状态
delete 删除节点
deleteall 递归删除节点
1）启动客户端
[atguigu@hadoop103 zookeeper-3.5.7]$ bin/zkCli.sh
2）显示所有操作命令
[zk: localhost:2181(CONNECTED) 1] help
3）查看当前znode中所包含的内容
[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]
4）查看当前节点详细数据
[zk: localhost:2181(CONNECTED) 1] ls -s /
[zookeeper]
cZxid = 0x0
ctime = Thu Jan 01 08:00:00 CST 1970
mZxid = 0x0
mtime = Thu Jan 01 08:00:00 CST 1970
pZxid = 0x0
cversion = -1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 0
numChildren = 1
5）分别创建2个普通节点
[zk: localhost:2181(CONNECTED) 3] create /sanguo “diaochan”
Created /sanguo
[zk: localhost:2181(CONNECTED) 4] create /sanguo/shuguo “liubei”
Created /sanguo/shuguo
6）获得节点的值
[zk: localhost:2181(CONNECTED) 5] get /sanguo
diaochan
[zk: localhost:2181(CONNECTED) 6] get -s /sanguo
diaochan
cZxid = 0x100000003
ctime = Wed Aug 29 00:03:23 CST 2018
mZxid = 0x100000003
mtime = Wed Aug 29 00:03:23 CST 2018
pZxid = 0x100000004
cversion = 1
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 1
[zk: localhost:2181(CONNECTED) 7]
[zk: localhost:2181(CONNECTED) 7] get -s /sanguo/shuguo
liubei
cZxid = 0x100000004
ctime = Wed Aug 29 00:04:35 CST 2018
mZxid = 0x100000004
mtime = Wed Aug 29 00:04:35 CST 2018
pZxid = 0x100000004
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 6
numChildren = 0
7）创建临时节点
[zk: localhost:2181(CONNECTED) 7] create -e /sanguo/wuguo “zhouyu”
Created /sanguo/wuguo
（1）在当前客户端是能查看到的
[zk: localhost:2181(CONNECTED) 3] ls /sanguo
[wuguo, shuguo]
（2）退出当前客户端然后再重启客户端
[zk: localhost:2181(CONNECTED) 12] quit
[atguigu@hadoop104 zookeeper-3.5.7]$ bin/zkCli.sh
（3）再次查看根目录下短暂节点已经删除
[zk: localhost:2181(CONNECTED) 0] ls /sanguo
[shuguo]
8）创建带序号的节点
（1）先创建一个普通的根节点/sanguo/weiguo
[zk: localhost:2181(CONNECTED) 1] create /sanguo/weiguo “caocao”
Created /sanguo/weiguo
（2）创建带序号的节点
[zk: localhost:2181(CONNECTED) 2] create /sanguo/weiguo “caocao”
Node already exists: /sanguo/weiguo
[zk: localhost:2181(CONNECTED) 3] create -s /sanguo/weiguo “caocao”
Created /sanguo/weiguo0000000000
[zk: localhost:2181(CONNECTED) 4] create -s /sanguo/weiguo “caocao”
Created /sanguo/weiguo0000000001
[zk: localhost:2181(CONNECTED) 5] create -s /sanguo/weiguo “caocao”
Created /sanguo/weiguo0000000002
[zk: localhost:2181(CONNECTED) 6] ls /sanguo
[shuguo, weiguo, weiguo0000000000, weiguo0000000001, weiguo0000000002, wuguo]
[zk: localhost:2181(CONNECTED) 6]
如果节点下原来没有子节点，序号从0开始依次递增。如果原节点下已有2个节点，则再排序时从2开始，以此类推。
9）修改节点数据值
[zk: localhost:2181(CONNECTED) 6] set /sanguo/weiguo “caopi”
10）节点的值变化监听
（1）在hadoop104主机上注册监听/sanguo节点数据变化
[zk: localhost:2181(CONNECTED) 26] [zk: localhost:2181(CONNECTED) 8] get -w /sanguo
（2）在hadoop103主机上修改/sanguo节点的数据
[zk: localhost:2181(CONNECTED) 1] set /sanguo “xishi”
（3）观察hadoop104主机收到数据变化的监听
WATCHER::
WatchedEvent state:SyncConnected type:NodeDataChanged path:/sanguo
11）节点的子节点变化监听（路径变化）
（1）在hadoop104主机上注册监听/sanguo节点的子节点变化
[zk: localhost:2181(CONNECTED) 1] ls -w /sanguo
[aa0000000001, server101]
（2）在hadoop103主机/sanguo节点上创建子节点
[zk: localhost:2181(CONNECTED) 2] create /sanguo/jin “simayi”
Created /sanguo/jin
（3）观察hadoop104主机收到子节点变化的监听
WATCHER::
WatchedEvent state:SyncConnected type:NodeChildrenChanged path:/sanguo
12）删除节点
[zk: localhost:2181(CONNECTED) 4] delete /sanguo/jin
13）递归删除节点
[zk: localhost:2181(CONNECTED) 15] deleteall /sanguo/shuguo
14）查看节点状态
[zk: localhost:2181(CONNECTED) 17] stat /sanguo
cZxid = 0x100000003
ctime = Wed Aug 29 00:03:23 CST 2018
mZxid = 0x100000011
mtime = Wed Aug 29 00:21:23 CST 2018
pZxid = 0x100000014
cversion = 9
dataVersion = 1
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 4
numChildren = 1