zookeeper 安装 配置集群

https://mirrors.tuna.tsinghua.edu.cn/apache/zookeeper/

[root@znode01 src]# tar -xzvf zookeeper-3.5.-alpha.tar.gz
[root@znode01 src]# ls
 zookeeper-3.5.-alpha  zookeeper-3.5.-alpha.tar.gz

[root@znode01 zookeeper-3.5.-alpha]# ls
bin          ivysettings.xml       recipes
build.xml    ivy.xml               src
CHANGES.txt  lib                   zookeeper-3.5.-alpha.jar
conf         LICENSE.txt           zookeeper-3.5.-alpha.jar.asc
contrib      NOTICE.txt            zookeeper-3.5.-alpha.jar.md5
dist-maven   README_packaging.txt  zookeeper-3.5.-alpha.jar.sha1
docs         README.txt

[root@znode01 zookeeper-3.5.-alpha]# cd conf/
[root@znode01 conf]# ls
configuration.xsl  log4j.properties  zoo_sample.cfg
[root@znode01 conf]# mv zoo_sample.cfg zoo.cfg
[root@znode01 conf]# ls
configuration.xsl  log4j.properties  zoo.cfg

修改配置文件:

[root@znode01 conf]# cat zoo.cfg
# The number of milliseconds of each tick
tickTime= #Zookeeper服务器之间或客户端与服务器之间维持心跳的时间间隔，也就是每个tickTime时间就会发送一个心跳。tickTime以毫秒为单位。
# The number of ticks that the initial
# synchronization phase can take
initLimit= #集群中的follower服务器与leader之间初始连接时能容忍的最多心跳数(ticTime的数量)
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit= #集群中的follower服务器与leader服务器之间请求和应答之间能容忍的最多必跳数(tickTime的数量)
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/tmp/zookeeper #Zookeeper保存数据的目录，默认情况下，Zookeeper将写数据的日志文件也何存在这个目录里。
# the port at which the clients will connect
clientPort=　#客户端连接Zookeeper服务器的端口,Zookeeper会监听这个端口，接受客户端的访问请求。
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=
#
# 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=
# Purge task interval in hours
# Set to "" to disable auto purge feature
#autopurge.purgeInterval=
#服务器名称与地址:集群信息(服务器编号，服务器地址，LF通信端口，选举端口)
#server.N=YYY:A:B
server.=192.168.1.104::
server.=192.168.1.103::
server.=192.168.1.108::

zk设置为奇数：

zookeeper有这样一个特性：集群中只要有过半的机器是正常工作的，那么整个集群对外就是可用的。也就是说如果有２个zookeeper，那么只要有１个死了zookeeper就不能用了，因为１没有过半，所以２个zookeeper的死亡容忍度为０；同理，要是有３个zookeeper,一个死了，还剩下２个正常的，过半了，所以３个zookeeper的容忍度为１；同理你多列举几个：2-->0;3-->1;4-->1;5-->2;6-->2会发现一个规律,2n和2n-1的容忍度是一样的，都是n-1,所以为了更加高效，何必增加那个不必要的zookeeper!!!!!

[root@znode01 conf]# mkdir /tmp/zookeeper
[root@znode01 conf]# touch /tmp/zookeeper/myid;echo > /tmp/zookeeper/myid
#创建一个myid文件，里面的内容是server.N中的N(server.2里面的内容为2)

将配好的zookeeper发到别外的两个节点上：

[root@znode01 local]# scp -r -P22022 zookeeper-3.5.-alpha 192.168.1.108:/usr/local/
[root@znode01 local]# scp -r -P22022 zookeeper-3.5.-alpha 192.168.1.10３:/usr/local/

注意其它的节点的myid内容分别人2,3。查看个个结点的myid

[root@znode01 zookeeper-3.5.-alpha]# cat /tmp/zookeeper/myid 

[root@znode02 zookeeper-3.5.-alpha]# cat /tmp/zookeeper/myid 

[root@znode03 zookeeper-3.5.-alpha]# cat /tmp/zookeeper/myid

启动zookeeper:

[root@znode01 bin]# ./zkServer.sh start
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.5.-alpha/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@znode02 zookeeper-3.5.-alpha]# ./bin/zkServer.sh start
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.5.-alpha/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED
[root@znode03 zookeeper-3.5.-alpha]# ./bin/zkServer.sh start
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.5.-alpha/bin/../conf/zoo.cfg
Starting zookeeper ... STARTED

之前的zoo.cnf做一下小的修改如下：

[root@znode01 zookeeper-3.5.-alpha]# cat conf/zoo.cfg
# The number of milliseconds of each tick
#Zookeeper服务器之间或客户端与服务器之间维持心跳的时间间隔，也就是每个tickTime时间就会发送一个心跳。tickTime以毫秒为单位。
tickTime=
# The number of ticks that the initial
# synchronization phase can take
#集群中的follower服务器与leader之间初始连接时能容忍的最多心跳数(ticTime的数量)
initLimit=
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
#集群中的follower服务器与leader服务器之间请求和应答之间能容忍的最多必跳数(tickTime的数量)
syncLimit=
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
#Zookeeper保存数据的目录，默认情况下，Zookeeper将写数据的日志文件也何存在这个目录里。
dataDir=/tmp/zookeeper
# the port at which the clients will connect
#客户端连接Zookeeper服务器的端口,Zookeeper会监听这个端口，接受客户端的访问请求。
clientPort=
# the maximum number of client connections.
# increase this if you need to handle more clients
#maxClientCnxns=
#
# 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=
# Purge task interval in hours
# Set to "" to disable auto purge feature
#autopurge.purgeInterval=
#服务器名称与地址:集群信息(服务器编号，服务器地址，LF通信端口，选举端口)
#server.N=YYY:A:B
server.=192.168.1.104::
server.=192.168.1.103::
server.=192.168.1.108::

下面看一下三个结点的过行情况：

[root@znode01 zookeeper-3.5.-alpha]# ./bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.5.-alpha/bin/../conf/zoo.cfg
Client port found: . Client address: localhost.
Mode: follower
[root@znode02 zookeeper-3.5.-alpha]# ./bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.5.-alpha/bin/../conf/zoo.cfg
Client port found: . Client address: localhost.
Mode: leader
[root@znode03 zookeeper-3.5.-alpha]# ./bin/zkServer.sh status
/usr/bin/java
ZooKeeper JMX enabled by default
Using config: /usr/local/zookeeper-3.5.-alpha/bin/../conf/zoo.cfg
Client port found: . Client address: localhost.
Mode: follower

这里要注意防火墙是不是把相应的端口打开！！！！