注意：如果未初始化數(shù)據(jù)目錄，則無法啟動ZooKeeper服務器。
//在生產(chǎn)環(huán)境中，您應該將ZooKeeper部署為具有奇數(shù)個服務器的集合。只要集合中的大多數(shù)服務器可用，ZooKeeper服務就可用。建議的最小集合大小是三個ZooKeeper服務器，Cloudera建議每個服務器在單獨的計算機上運行。此外，如果可能，ZooKeeper服務器進程應該有自己的專用磁盤存儲。

專注于為中小企業(yè)提供成都做網(wǎng)站、成都網(wǎng)站建設服務,電腦端+手機端+微信端的三站合一,更高效的管理,為中小企業(yè)廣東免費做網(wǎng)站提供優(yōu)質的服務。我們立足成都，凝聚了一批互聯(lián)網(wǎng)行業(yè)人才，有力地推動了上1000家企業(yè)的穩(wěn)健成長，幫助中小企業(yè)通過網(wǎng)站建設實現(xiàn)規(guī)模擴充和轉變。

//查看zk的狀態(tài)

[root@hadoop-205-107 opt]# echo "stat" |nc 192.168.205.107 2181
Zookeeper version: 3.4.5-cdh6.9.2--1, built on 04/04/2017 08:43 GMT
Clients:
 /192.168.205.107:35132[1](queued=0,recved=424,sent=424)
 /192.168.205.107:45317[0](queued=0,recved=1,sent=0)
 /192.168.205.107:35125[1](queued=0,recved=879,sent=879)
 /192.168.205.107:35227[1](queued=0,recved=6576,sent=6576)
 /192.168.205.107:35133[1](queued=0,recved=449,sent=449)
 /192.168.205.107:35075[1](queued=0,recved=508,sent=510)
 /192.168.205.107:35100[1](queued=0,recved=432,sent=432)
 /192.168.205.107:35083[1](queued=0,recved=2404,sent=2441)

Latency min/avg/max: 0/0/231
Received: 15265
Sent: 15579
Connections: 8
Outstanding: 0
Zxid: 0x7fa
Mode: standalone
Node count: 44
[root@hadoop-205-107 opt]# echo "stat" |nc 192.168.205.107 2181|grep Mode
Mode: standalone

[root@hadoop-205-107 opt]# /opt/cloudera/parcels/CDH-5.9.2-1.cdh6.9.2.p0.3/lib/zookeeper/bin/zkServer.sh status
JMX enabled by default
Using config: /opt/cloudera/parcels/CDH-5.9.2-1.cdh6.9.2.p0.3/lib/zookeeper/bin/../conf/zoo.cfg
Mode: standalone

[root@hadoop-205-107 opt]# telnet 192.168.205.107 2181
Trying 192.168.205.107...
Connected to 192.168.205.107.
Escape character is '^]'.
stat   //手動輸入
Zookeeper version: 3.4.5-cdh6.9.2--1, built on 04/04/2017 08:43 GMT
Clients:
 /192.168.205.107:35132[1](queued=0,recved=445,sent=445)
 /192.168.205.107:35125[1](queued=0,recved=912,sent=912)
 /192.168.205.107:35227[1](queued=0,recved=7233,sent=7233)
 /192.168.205.107:35133[1](queued=0,recved=470,sent=470)
 /192.168.205.107:45868[0](queued=0,recved=1,sent=0)
 /192.168.205.107:35075[1](queued=0,recved=529,sent=531)
 /192.168.205.107:35100[1](queued=0,recved=453,sent=453)
 /192.168.205.107:35083[1](queued=0,recved=2447,sent=2484)

Latency min/avg/max: 0/0/231
Received: 16267
Sent: 16595
Connections: 8
Outstanding: 0
Zxid: 0x855
Mode: standalone
Node count: 44
Connection closed by foreign host.

參考鏈接：https://www.cloudera.com/documentation/enterprise/5-13-x/topics/cm_mc_zookeeper_service.html#xd_583c10bfdbd326ba--6eed2fb8-14349d04bee--7f1a