【zookeeper】 zookeeper 集群搭建

集群搭建环境：

发行版：CentOS-6.6 64bit

内核：2.6.32-504.el6.x86_64

CPU：intel-i7 3.6G

内存：2G

集群搭建步骤：

1. 确保机器安装了jdk

[root@rocket ~]# java -version

openjdk version "1.8.0_51"

OpenJDK Runtime Environment (build 1.8.0_51-b16)

OpenJDK 64-Bit Server VM (build 25.51-b03, mixed mode)

如果找不到jdk，可以通过yum进行安装，如果发行版不是CentOS，请自行搜索对应发行版的安装方法。

[root@rocket local]# yum -y install java

2. 下载zookeeper，选一个合适的版本

在官网http://zookeeper.apache.org/releases.html找一个合适的镜像进行下载。这里使用北理的镜像进行下载。

[root@rocket local]#  \

wget http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gz

下载完成之后分别解压到

[root@rocket local]# tar -zxvf zookeeper-3.4.6.tar.gz zookeeper-server1

[root@rocket local]# tar -zxvf zookeeper-3.4.6.tar.gz zookeeper-server2

[root@rocket local]# tar -zxvf zookeeper-3.4.6.tar.gz zookeeper-server3

3. 拷贝配置文件

[root@rocket local]# cd /usr/local/zookeeper-server1/;cp conf/zoo_sample.cfg conf/zoo_test.cfg

[root@rocket local]# cd /usr/local/zookeeper-server2/;cp conf/zoo_sample.cfg conf/zoo_test.cfg

[root@rocket local]# cd /usr/local/zookeeper-server3/;cp conf/zoo_sample.cfg conf/zoo_test.cfg

4. 修改配置文件

zookeeper-server1

# 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

dataDir=/tmp/zookeeper-server1/data

dataLogDir=/tmp/zookeeper-server1/logs

# the port at which the clients will connect

clientPort=2181

server.1=127.0.0.1:8880:7770

server.2=127.0.0.1:8881:7770

server.3=127.0.0.1:8882:7770

zookeeper-server2

# 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

dataDir=/tmp/zookeeper-server2/data

dataLogDir=/tmp/zookeeper-server2/logs

# the port at which the clients will connect

clientPort=3181

server.1=127.0.0.1:8880:7770

server.2=127.0.0.1:8881:7770

server.3=127.0.0.1:8882:7770

zookeeper-server3

# 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

dataDir=/tmp/zookeeper-server3/data

dataLogDir=/tmp/zookeeper-server3/logs

# the port at which the clients will connect

clientPort=4181

server.1=127.0.0.1:8880:7770

server.2=127.0.0.1:8881:7770

server.3=127.0.0.1:8882:7770

5. 建立zookeeper运行目录，data目录和log目录

[root@rocket local]# mkdir -p zookeeper-server1/logs zookeeper-server1/data

[root@rocket local]# mkdir -p zookeeper-server2/logs zookeeper-server2/data

[root@rocket local]# mkdir -p zookeeper-server3/logs zookeeper-server3/data

查看当前运行目录情况：

[root@rocket tmp]# tree

├── zookeeper-server1

│   ├── data

│   └── logs

├── zookeeper-server2

│   ├── data

│   └── logs

└── zookeeper-server3

├── data

└── logs

6. 在data目录中创建文件 myid 文件，每个文件中分别写入当前机器的server id

[root@rocket tmp]# echo "1" > zookeeper-server1/data/myid

[root@rocket tmp]# echo "2" > zookeeper-server2/data/myid

[root@rocket tmp]# echo "3" > zookeeper-server3/data/myid

7. 在每个目录中启动zookeeper

[root@rocket local]# cd /usr/local/zookeeper-server1/;bin/zkServer.sh start

[root@rocket local]# cd /usr/local/zookeeper-server2/;bin/zkServer.sh start

[root@rocket local]# cd /usr/local/zookeeper-server3/;bin/zkServer.sh start

查看启动状态

[root@iZ257w5531qZ bin]# ./zkServer.sh start
ZooKeeper JMX enabled by default
Using config: /opt/zookeeper-3/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

注意，这里如果提示

Error contacting service. It is probably not running.

说明进程启动失败或集群未建立成功，这时需要查看对应目录中的zookeeper.out日志去找到相应的原因并去解决它。

8. 测试连接zookeeper集群

[root@rocket local]# cd zookeeper-server1;bin/zkCli.sh -server localhost:2181

可以看到这里已经连接成功了，而且能查看节点情况，说明zookeeper集群已经开始工作了。

参考：zookeeper集群搭建    zookeeper配置详解