Zookeeper在Centos上安装

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本文介绍如何安装ZooKeeper并配置集群环境，包括内存设置和客户端连接配置。同时，展示了如何在Dubbo中使用ZooKeeper作为注册中心。

下载zookeeper的包我用的是zookeeper-3.4.6
tar -zxvf zookeeper-3.4.6.tar.gz
cp -a conf/zoo_sample.cfg conf/zoo.cfg
[b]修改配置文件[/b]
vi conf/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=/opt/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=centos1:2888:3888
server.2=centos2:2888:3888
server.3=centos3:2888:3888

这里我使用的3台虚拟机，这里主要设置server.X的X参数
在对应的每台机子上的/opt/zookeeper/myid设置为对应的X
将zk的文件scp到centos1,2,3各自一份

[b]增加内存[/b]
zkEnv.sh
#在文件底部增加
export JVMFLAGS="-Xms1024m -Xmx2048m $JVMFLAGS"
[b]查询内存大小[/b]
ps -ef|grep zookeeper
#查询pid
jmap --heap pid

启动
./bin/zkServer.sh start
停止
./bin/zkServer.sh stop

测试zk服务
jps
出现QuorumPeerMain或者
执行$ zkCli.sh -server centos1:2181，检查指定服务器是否成功启动。

 zkCli.sh -server centos1:2181
Connecting to centos1:2181
2016-01-26 16:30:51,461 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
2016-01-26 16:30:51,467 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=CentOS1
2016-01-26 16:30:51,467 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.8.0_65
2016-01-26 16:30:51,475 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2016-01-26 16:30:51,475 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64/jre
2016-01-26 16:30:51,475 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/home/

[b]dubbo上使用[/b]
dubbo.registry.address=zookeeper://centos1:2181?backup=10.0.30.139:2181