Zookeeper集群环境配置

总的步骤是下载压缩包，解压，授予权限，修改配置文件，压缩修改后的文件发送到其他节点，其他节点解压，授予权限，修改配置文件，所有节点添加环境变量。

1.下载压缩包

去zookeeper的官网下载压缩包 https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/

2.解压

解压缩到/usr/local目录下,并重新命名，添加权限，后面如有解压缩到/usr/local/时都要添加权限。

sudo tar -zxf zookeeper-3.4.13.tar.gz -C /usr/local
cd /usr/local/
sudo mv zookeeper-3.4.13/ zookeeper
sudo chown -R hadoop:hadoop /usr/local/zookeeper

3.配置环境

进入zookeeper/conf的目录下，将zoo_sample.cfg样本配置文件复制一份出来并重命名为 zoo.cfg

cp zoo_sample.cfg zoo.cfg

设置内容，注意server.1开头的这几行，需要更改集群中其他节点的ip地址，或根据hosts映射文件改为主机名。如下所示，ip地址需要改，x需要改。

server.x= 192.168.0.1:2888:3888
日志目录和数据目录修改为
dataLogDir=/usr/local/zookeeper/logs
dataDir=/usr/local/zookeeper/data

# 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.
dataLogDir=/usr/local/zookeeper/logs
dataDir=/usr/local/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
#
autopurge.snapRetainCount=500
autopurge.purgeInterval=24
server.1= 192.168.0.1:2888:3888
server.2= 192.168.0.4:2888:3888
server.3= 192.168.0.2:2888:3888
# 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

 在上面提到的dataDir目录下新建myid的文件，并将自己的x写入，一个数字。注意x和ip的对应关系。

 4 在多节点配置

 将修改后的zookeeper文件打包，并传输到其他的所有节点.

tar -zcf ~/zookeeper.tar.gz /usr/local/zookeeper

scp ~/zookeeper.tar.gz slave3:~

ssh登陆到slave3

解压到/usr/local,添加权限，命令参考第二步

此时，修改/usr/local/zookeeper/data/myid文件并将里面的数字改为ip对应的server .x中的x

每个节点都要完成这里的操作。

5 添加环境变量

每个节点都要做本部分操作

sudo vim ~/.bashrc

将/usr/local/zookeeper/bin添加到环境变量

export PATH=$PATH:/usr/local/hadoop/bin:/usr/local/hadoop/sbin:/usr/local/zookeeper/bin
格式如上，如果以前有环境变量就在最后面添加冒号再添加环境变量，执行下面的命令使环境变量生效

source ~/.bashrc

6.启动zookeeper

 每个节点都要启动

zkServer.sh start

查看状态

zkServer.sh status

停止

zkServer.sh stop

查看日志

cat zookeeper.out

如图,必须得所有server都启动后才能查看启动的状态，一个leader和多个follower