zookeeper集群扩容和收缩

服务器信息

zookeeper版本 3.4.6

jdk版本 1.7.0_80

10.100.0.29 zk1
10.100.0.44 zk2
10.100.0.45 zk3
10.100.0.46 zk4
10.100.0.47 zk5

##zookeeper扩容（3 -> 5）

3节点的配置并检查状态

配置：

tickTime=2000
initLimit=10
syncLimit=5
dataDir=/data/app/zookeeper
clientPort=2181
server.1=10.100.0.29:2888:3888
server.2=10.100.0.44:2888:3888
server.3=10.100.0.45:2888:3888

zk1状态：

Zookeeper version: 3.4.6-1569965, built on 02/20/2014 09:09 GMT
Clients:
/127.0.0.1:36078[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x0
Mode: follower
Node count: 4

zk2状态：

Zookeeper version: 3.4.6-1569965, built on 02/20/2014 09:09 GMT
Clients:
/127.0.0.1:46938[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x100000000
Mode: leader
Node count: 4

zk3状态：

Zookeeper version: 3.4.6-1569965, built on 02/20/2014 09:09 GMT
Clients:
/127.0.0.1:37306[0](queued=0,recved=1,sent=0)

Latency min/avg/max: 0/0/0
Received: 1
Sent: 0
Connections: 1
Outstanding: 0
Zxid: 0x100000000
Mode: follower
Node count: 4

创建znode查看集群是否同步

2.加入zookeeper 4，5节点

配置如下：

tickTime=2000
initLimit=10
syncLimit=5
dataDir=/data/app/zookeeper
clientPort=2181
server.1=10.100.0.29:2888:3888
server.2=10.100.0.44:2888:3888
server.3=10.100.0.45:2888:3888server.4=10.100.0.46:2888:3888
server.5=10.100.0.47:2888:3888

启动4，5节点，测试写入数据

zk4：

[zk: localhost:2181(CONNECTED) 0] get /test/test1
"test1"
cZxid = 0x10000000a
ctime = Sun Jun 05 08:51:09 CST 2016
mZxid = 0x10000000a
mtime = Sun Jun 05 08:51:09 CST 2016
pZxid = 0x10000000a
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0
[zk: localhost:2181(CONNECTED) 1] create /test/test2 'test2'
Created /test/test2

zk1:

[zk: localhost:2181(CONNECTED) 0] get /test/test2
'test2'
cZxid = 0x100000015
ctime = Sun Jun 05 08:58:24 CST 2016
mZxid = 0x100000015
mtime = Sun Jun 05 08:58:24 CST 2016
pZxid = 0x100000015
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 7
numChildren = 0

修改zk1，2，3配置，依次重启，添加节点完成

##集群收缩（5-3）

修改保留节点的配置后依次重启，重启完成后依次关闭2个不需要的节点即可。