摘要：使用文章創建的集群下使用部署中創建的集群進行的安裝在上制作安裝包下載官方源下載顯得十分緩慢，所以還是選擇國內的鏡像源，將下載到創建鏈接下載完成后將解壓并創建鏈接，方便管理修改配置文件中已經提供了配置模板，復制一份

使用文章“Docker創建的集群下使用ansible部署hadoop”中創建的集群進行zookeeper的安裝

官方源下載顯得十分緩慢，所以還是選擇國內的鏡像源，將zookeeper下載到/opt

[root@cluster-master opt]# wget https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/stable/zookeeper-3.4.10.tar.gz

下載完成后將zookeeper-3.4.10.tar.gz解壓并創建鏈接，方便管理

[root@cluster-master opt]# tar -zxvf zookeeper-3.4.10.tar.gz
[root@cluster-master opt]# ln -s zookeeper-3.4.10 zookeeper

/opt/zookeeper/conf中已經提供了zoo_sample.cfg配置模板，復制一份zoo.cfg進行修改即可使用，我的配置項如下：
[root@cluster-master conf]# cp zoo_sample.cfg zoo.cfg
[root@cluster-master conf]# vi zoo.cfg

# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/home/zookeeper/data
# the port at which the clients will connect
clientPort=2181
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=60
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
#
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

server.2=172.18.0.2:2888:3888
server.3=172.18.0.3:2888:3888
server.4=172.18.0.4:2888:3888
server.5=172.18.0.5:2888:3888

dataDir做了從新定義，server項使用IP的最后一位，也是為了方便管理

在/opt/zookeeper下新建postinstall.sh創建dataDir目錄和myid文件，并寫入zoo.cfg中定義的myid值

vi /opt/zookeeper/postinstall.sh

#!/bin/bash

# zookeeper conf file
conf_file="/opt/zookeeper/conf/zoo.cfg"
# get myid
IP=$(/sbin/ifconfig -a|grep inet|grep -v 127.0.0.1|grep -v inet6 |
     awk "{print $2}")
ID=$(grep ${IP} ${conf_file}|cut -d = -f 1|cut -d . -f 2)

# get dataDir
dataDir=$(grep dataDir ${conf_file}|grep -v "^#"|cut -d = -f 2)

# create dataDir and myid file
mkdir -p ${dataDir}
:>${dataDir}/myid
echo ${ID} > ${dataDir}/myid

將鏈接zookeeper和目錄zookeeper-3.4.10打包并壓縮

[root@cluster-master opt]# tar -zcvf zookeeper-dis.tar.gz zookeeper zookeeper-3.4.10

[root@cluster-master opt]# vi install-zookeeper.yaml

---
- hosts: slaves
  tasks:
    - name: install ifconfig
      yum: name=net-tools state=latest
    - name: unarchive zookeeper
      unarchive: src=/opt/zookeeper-dis.tar.gz dest=/opt
    - name: postinstall
      shell: bash /opt/zookeeper/postinstall.sh

[root@cluster-master opt]# ansible-playbook install-zookeeper.yaml

此時，zookeeper集群已經可以正常啟動

[root@cluster-master opt]# ansible cluster -m command -a "/opt/zookeeper/bin/zkServer.sh start"

[root@cluster-master bin]# ./zkServer.sh status
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper/bin/../conf/zoo.cfg
Mode: follower

[root@cluster-master bin]# ./zkCli.sh -server localhost:2181
Connecting to localhost:2181
2017-08-29 18:05:36,078 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.10-39d3a4f269333c922ed3db283be479f9deacaa0f, built on 03/23/2017 10:13 GMT
2017-08-29 18:05:36,091 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=cluster-master
2017-08-29 18:05:36,091 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.8.0_141
2017-08-29 18:05:36,098 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2017-08-29 18:05:36,098 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.141-1.b16.el7_3.x86_64/jre
2017-08-29 18:05:36,098 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/opt/zookeeper/bin/../build/classes:/opt/zookeeper/bin/../build/lib/*.jar:/opt/zookeeper/bin/../lib/slf4j-log4j12-1.6.1.jar:/opt/zookeeper/bin/../lib/slf4j-api-1.6.1.jar:/opt/zookeeper/bin/../lib/netty-3.10.5.Final.jar:/opt/zookeeper/bin/../lib/log4j-1.2.16.jar:/opt/zookeeper/bin/../lib/jline-0.9.94.jar:/opt/zookeeper/bin/../zookeeper-3.4.10.jar:/opt/zookeeper/bin/../src/java/lib/*.jar:/opt/zookeeper/bin/../conf:
2017-08-29 18:05:36,099 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2017-08-29 18:05:36,100 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2017-08-29 18:05:36,100 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=
2017-08-29 18:05:36,100 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2017-08-29 18:05:36,100 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2017-08-29 18:05:36,100 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.10.0-514.26.2.el7.x86_64
2017-08-29 18:05:36,101 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2017-08-29 18:05:36,101 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2017-08-29 18:05:36,101 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/opt/zookeeper-3.4.10/bin
2017-08-29 18:05:36,124 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=localhost:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@25f38edc
2017-08-29 18:05:36,205 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server localhost/127.0.0.1:2181. Will not attempt to authenticate using SASL (unknown error)
Welcome to ZooKeeper!
JLine support is enabled
2017-08-29 18:05:36,730 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@876] - Socket connection established to localhost/127.0.0.1:2181, initiating session
2017-08-29 18:05:36,795 [myid:] - INFO  [main-SendThread(localhost:2181):ClientCnxn$SendThread@1299] - Session establishment complete on server localhost/127.0.0.1:2181, sessionid = 0x25e2f22aa660001, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 1] 

使用到了之前創建的集群和ansible，發現使用ansible部署應用確實很方便。