使用文章“Docker创建的集群下使用ansible部署hadoop”中创建的集群进行zookeeper的安装

在cluster-master上制作zookeeper安装包

下载

官方源下载显得十分缓慢，所以还是选择国内的镜像源，将zookeeper下载到/opt

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

创建链接

下载完成后将zookeeper-3.4.10.tar.gz解压并创建链接，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

修改配置文件

/opt/zookeeper/conf中已经提供了zoo_sample.cfg配置模板，复制一份zoo.cfg进行修改即可使用，我的配置项如下：
[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做了从新定义，server项使用IP的最后一位，也是为了方便管理

创建shell脚本，完成安装步骤

在/opt/zookeeper下新建postinstall.sh创建dataDir目录和myid文件，并写入zoo.cfg中定义的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

打包配置完成后的zookeeper，准备上传至slave主机

将链接zookeeper和目录zookeeper-3.4.10打包并压缩

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

创建yaml，安装zookeeper

[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

分发安装文件到slave主机

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

启动zookeeper

此时，zookeeper集群已经可以正常启动

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

查看状态

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

运行客户端

[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=<NA>
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] 

总结

使用到了之前创建的集群和ansible，发现使用ansible部署应用确实很方便。