(个人)Zookeeper集群环境部署

一.准备工作

1. 下载zookeeper,下载地址:https://zookeeper.apache.org/releases.html#download 

2. 下载CentOS7的镜像,下载地址:https://www.centos.org/download/

3. 准备XManager,用于远程连接Linux,我用的是CentOS7.

4. 准备VMVare Workstation,安装好3台以上(至少3台才能集群)CentOS75. 设置好CentOS的JDK,本人使用的是最新的JDK8

二. Zookeeper部署

说明:该教程是在一个机器上部署的,请求1-5步完成后,重复在其他机器上进行操作.1. 将下载好的 zookeeper-3.4.10.tar.gz(我当前版本) 通过XFTP上传到Linux的指定目录,假设为 ZK_HOME 2. 在ZK_HOME中解压zookeeper

tar -zxvf zookeeper-3.4.10.tar.gz

3. 在ZK_HOME的conf目录中,复制zookeeper的配置为zoo.cfg(zk启动时候默认的配置文件)

cd /ZK_HOME
cp zoo_sample.cfg zoo.cfg
---如果是单机环境部署,可以直接通过此命令启动.
---ZK的启动参数有: {start|start-foreground|stop|restart|status|upgrade|print-cmd}
./zkServer.sh start 

4. 在ZK_HOME的conf目录的zoo.cfg的最后添加如下配置:

server.1=192.168.100.10:2888:3181
server.2=192.168.100.11:2888:3181
server.3=192.168.100.12:2888:3181

说明:
a. 2888表示follower节点与leader节点交换信息的端口号b. 3181是在leader节点挂掉后,进行leader选举需要的端口.本步骤完成后,zoo.cfg的结果如下所示

# 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=/tmp/zookeeper
# 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.1=192.168.100.10:2888:3181
server.2=192.168.100.11:2888:3181
server.3=192.168.100.12:2888:3181

5. 在ZK_HOME的zoo.cfg中有一个

dataDir=/tmp/zookeeper

此时需要在该指定目录下创建myid文件,其中的文件内容为zoo.cfg最后部分的配置获取.获取规则:假设本机ip为192.168.100.10 那么此时的myid文件中只有一行内容各位1

cd /tmp
mkdir /zookeeper
vim myid
---通过vim设置myid

6. 启动启动ZK跳转到ZK的bin目录下,然后运行

-- 启动zookeeper
./zkServer.sh start
-- 查看运行状态
./zkServer.sh status 

7. 连接zookeeper,其中连接端口为2181 

zkCli.sh -server 192.168.100.10:2181,192.168.100.11:2181,192.168.100.12:2181

如果连接成功可以看到如下信息

2017-08-19 01:48:03,042 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.10-39d3a4f269333c922ed3db283be479f9deacaa0f, built on 03/23/2017 10:13 GMT
2017-08-19 01:48:03,057 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=localhost
2017-08-19 01:48:03,057 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.8.0_144
2017-08-19 01:48:03,075 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2017-08-19 01:48:03,076 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/java/jdk1.8.0_144/jre
2017-08-19 01:48:03,076 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/lcf-tools/zookeeper-3.4.10/bin/../build/classes:/lcf-tools/zookeeper-3.4.10/bin/../build/lib/*.jar:/lcf-tools/zookeeper-3.4.10/bin/../lib/slf4j-log4j12-1.6.1.jar:/lcf-tools/zookeeper-3.4.10/bin/../lib/slf4j-api-1.6.1.jar:/lcf-tools/zookeeper-3.4.10/bin/../lib/netty-3.10.5.Final.jar:/lcf-tools/zookeeper-3.4.10/bin/../lib/log4j-1.2.16.jar:/lcf-tools/zookeeper-3.4.10/bin/../lib/jline-0.9.94.jar:/lcf-tools/zookeeper-3.4.10/bin/../zookeeper-3.4.10.jar:/lcf-tools/zookeeper-3.4.10/bin/../src/java/lib/*.jar:/lcf-tools/zookeeper-3.4.10/bin/../conf:
2017-08-19 01:48:03,079 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2017-08-19 01:48:03,080 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2017-08-19 01:48:03,080 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2017-08-19 01:48:03,081 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2017-08-19 01:48:03,081 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2017-08-19 01:48:03,081 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.10.0-514.26.2.el7.x86_64
2017-08-19 01:48:03,082 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=root
2017-08-19 01:48:03,082 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/root
2017-08-19 01:48:03,082 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/lcf-tools/zookeeper-3.4.10/conf
2017-08-19 01:48:03,087 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=192.168.100.10:2181,192.168.100.11:2181,192.168.100.12:2181 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@1a86f2f1
2017-08-19 01:48:03,195 [myid:] - INFO  [main-SendThread(192.168.100.10:2181):ClientCnxn$SendThread@1032] - Opening socket connection to server 192.168.100.10/192.168.100.10:2181. Will not attempt to authenticate using SASL (unknown error)
Welcome to ZooKeeper!
JLine support is enabled
2017-08-19 01:48:03,746 [myid:] - INFO  [main-SendThread(192.168.100.10:2181):ClientCnxn$SendThread@876] - Socket connection established to 192.168.100.10/192.168.100.10:2181, initiating session
[zk: 192.168.100.10:2181,192.168.100.11:2181,192.168.100.12:2181(CONNECTING) 0] 2017-08-19 01:48:04,093 [myid:] - INFO  [main-SendThread(192.168.100.10:2181):ClientCnxn$SendThread@1299] - Session establishment complete on server 192.168.100.10/192.168.100.10:2181, sessionid = 0x15df975935c0000, negotiated timeout = 30000

WATCHER::

WatchedEvent state:SyncConnected type:None path:null

三. 补充内容

0. zookeeper目录中各个文件的认识

bin目录 
zk的可执行脚本目录，包括zk服务进程，zk客户端，等脚本。其中，.sh是Linux环境下的脚本，.cmd是Windows环境下的脚本。
conf目录 
配置文件目录。zoo_sample.cfg为样例配置文件，需要修改为自己的名称，一般为zoo.cfg。log4j.properties为日志配置文件。
lib 
zk依赖的包。
contrib目录 
一些用于操作zk的工具包。

1. 如果不想每次zookeeper都跳转到zk的bin目录,则可以将bin目录加入全局path中.注意第3行和第5行末尾

2. zookeeper启动后会在bin目录生成一个zookeeper.out的日志文件,可以通过tail指令进行查看

如果觉得麻烦,还可以直接通过添加指令的形式一起启动进行查看:

3. zoo.cfg配置文件解读

4. 启动后提示  java.net.NoRouteToHostException:No route to host 该问题为找不到路由,防火墙没有关闭.

---------------------------------------------------------------
Ubuntu（ubuntu-12.04-desktop-amd64）
查看防火墙状态：ufw status
关闭防火墙：ufw disable
---------------------------------------------------------------
centos6.0
查看防火墙状态：service iptables status
关闭防火墙：chkconfig iptables off    #开机不启动防火墙服务
--------------------------------------------------------------
centos7.0(默认是使用firewall作为防火墙，如若未改为iptables防火墙，使用以下命令查看和关闭防火墙)
查看防火墙状态：firewall-cmd --state
关闭防火墙：systemctl stop firewalld.service

5. 提示 Address aready in use ,该问题应该是端口被占用,通过如下指令查看端口占用:

-----查看端口占用------
方法一  lsof -i:端口号
方法二  netstat -tunlp|grep 端口号
-----杀掉进程---------
推荐方法  kill -s 9 3382  其中9为尽快杀掉进程的意思  3382为pid