Linux下Zookeeper分布式安装与配置

① 首先按照Zookeeper基础入门与安装部署中在三个服务器上安装配置单机版Zookeeper。

② 在Zookeeper的数据目录下创建名字为myid的文件，内容为其集群唯一编号。

如这里数据目录均在/home/softinstall/apache-zookeeper-3.5.5-bin/zkData下，这个路径可以自定义，配置在zoo.cfg中。

如下所示在服务器一中创建myid文件

[root@localhost apache-zookeeper-3.5.5-bin]# cd zkData/
[root@localhost zkData]# touch myid
[root@localhost zkData]# vim myid
[root@localhost zkData]# more myid
1

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③ 修改集群中每个Zookeeper的zoo.cfg文件

添加集群配置：

server.1=192.168.0.100:2888:3888
server.2=192.168.0.101:2888:3888
server.3=192.168.0.110:2888:3888

配置参数说明

server.A=B:C:D

• A是一个数字，表示这是第几号服务器。集群模式下配置一个文件myid，这个文件在dataDir目录下，这文件里面的数据就是A的值。Zookeeper启动时读取此文件，拿到里面的数据与zoo.cfg里面的配置信息比对从而判断到底是哪个server。
• B是服务器IP地址。
• C是这个服务器与集群中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。这个端口就是用来执行选举时服务器相互通信的端口。

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④ 启动server1

看下面日志，是不是出错了？

[root@localhost apache-zookeeper-3.5.5-bin]# vim conf/zoo.cfg
[root@localhost apache-zookeeper-3.5.5-bin]# bin/zkServer.sh start
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/softinstall/apache-zookeeper-3.5.5-bin/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@localhost apache-zookeeper-3.5.5-bin]# bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/softinstall/apache-zookeeper-3.5.5-bin/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Error contacting service. It is probably not running.
[root@localhost apache-zookeeper-3.5.5-bin]#

⑤ 启动server2

//如下是server2
[root@localhost apache-zookeeper-3.5.5-bin]# vim conf/zoo.cfg
[root@localhost apache-zookeeper-3.5.5-bin]# bin/zkServer.sh start
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/softinstall/apache-zookeeper-3.5.5-bin/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@localhost apache-zookeeper-3.5.5-bin]# bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/softinstall/apache-zookeeper-3.5.5-bin/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: leader
[root@localhost apache-zookeeper-3.5.5-bin]#

server2成功晋级为leader，此时再次查看server1的status会发现其成为了follower：

//如下是server1
[root@localhost apache-zookeeper-3.5.5-bin]# bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /home/softinstall/apache-zookeeper-3.5.5-bin/bin/../conf/zoo.cfg
Client port found: 2181. Client address: localhost.
Mode: follower

⑥ 启动server3

server3成为server2的follower。

⑦ 客户端命令行操作

可以使用help查看客户端有哪些命令可操作：

ZooKeeper -server host:port cmd args
addauth scheme auth
close
config [-c] [-w] [-s]
connect host:port
create [-s] [-e] [-c] [-t ttl] path [data] [acl]
delete [-v version] path
deleteall path
delquota [-n|-b] path
get [-s] [-w] path
getAcl [-s] path
history
listquota path
ls [-s] [-w] [-R] path
ls2 path [watch]
printwatches on|off
quit
reconfig [-s] [-v version] [[-file path] | [-members serverID=host:port1:port2;port3[,...]*]] | [-add serverId=host:port1:port2;port3[,...]]* [-remove serverId[,...]*]
redo cmdno
removewatches path [-c|-d|-a] [-l]
rmr path
set [-s] [-v version] path data
setAcl [-s] [-v version] [-R] path acl
setquota -n|-b val path
stat [-w] path
sync path

• 查看当前znode中包含的内容ls /

[zk: localhost:2181(CONNECTED) 5] ls /
[zookeeper]

• 查看当前节点详细数据ls2 /

[zk: localhost:2181(CONNECTED) 6] ls2 /
'ls2' has been deprecated. Please use 'ls [-s] path' instead.
[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

该命令提示过期建议使用ls [-s] path

[zk: localhost:2181(CONNECTED) 7] 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

参考博文：Zookeeper基础入门与安装部署