ZooKeeper服务器搭建
Contents
前提是要安装好Java环境 ^_^
安装
然后解压到安装目录即可.这里假设是安装在/ihome/java/zookeeper-3.4.8
启动模式
配置文件：解压后，在安装目录下的conf/zoo_sample.cfg样板配置文件。
独立模式
创建数据目录（默认是在/tmp目录下，不过建议修改下）：
mkdir -p /ihome/java/zookeeper-3.4.8/data/z1
然后复制一份配置文件到该目录下：
cp /ihome/java/zookeeper-3.4.8/conf/zoo_sample.cfg /ihome/java/zookeeper-3.4.8/data/z1/zoo.cfg
修改一下数据目录的指向：
dataDir=/ihome/java/zookeeper-3.4.8/data/z1
然后启动：
╭─sky@sky-linux /ihome/java/zookeeper-3.4.8/data/z1
╰─➤ /ihome/java/zookeeper-3.4.8/bin/zkServer.sh start ./zoo.cfg
这时，可以使用客户端登录即可：
╭─sky@sky-linux /ihome/java/zookeeper-3.4.8/data/z1
╰─➤ /ihome/java/zookeeper-3.4.8/bin/zkCli.sh 130 ↵
Connecting to localhost:2181
2016-05-12 18:29:52,341 [myid:] - INFO [main:Environment@100] - Client environment:zookeeper.version=3.4.8--1, built on 02/06/2016 03:18 GMT
2016-05-12 18:29:52,343 [myid:] - INFO [main:Environment@100] - Client environment:host.name=sky-linux
2016-05-12 18:29:52,343 [myid:] - INFO [main:Environment@100] - Client environment:java.version=1.8.0_60
...
2016-05-12 18:29:52,409 [myid:] - INFO [main-SendThread(ip6-localhost:2181):ClientCnxn$SendThread@1299] - Session establishment complete on server ip6-localhost/0:0:0:0:0:0:0:1:2181, sessionid = 0x154a47364d60005, negotiated timeout = 30000
WATCHER::
WatchedEvent state:SyncConnected type:None path:null
[zk: localhost:2181(CONNECTED) 0]
如果看到Session establishment complete on server就表示成功了。
集群模式
假设有三个节点，数据目录分别为：
/ihome/java/zookeeper-3.4.8/data/z1
/ihome/java/zookeeper-3.4.8/data/z2
/ihome/java/zookeeper-3.4.8/data/z3
节点z1
节点z1的配置文件（/ihome/java/zookeeper-3.4.8/data/z1/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=/ihome/java/zookeeper-3.4.8/data/z1
# 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=127.0.0.1:2222:2223
server.2=127.0.0.1:3333:3334
server.3=127.0.0.1:4444:4445
id文件为：（/ihome/java/zookeeper-3.4.8/data/z1/myid),内容为:
╭─sky@sky-linux /ihome/java/zookeeper-3.4.8/data/z1
╰─➤ cat myid
1
其他2个的配置文件类似，主要修改下：
每个节点都有以下节点配置信息：
server.1=127.0.0.1:2222:2223
server.2=127.0.0.1:3333:3334
server.3=127.0.0.1:4444:4445
其中server.N，就是myid文件里的数字.127.0.0.1表示节点的IP地址，2222端口：用于仲裁通信，2223端口：用于群首选举.
然后每个节点的dataDir要修改为自己的：
z2的配置文件,将数据目录修改为:
dataDir=/ihome/java/zookeeper-3.4.8/data/z2
z2的配置文件，将客户端连接的端口修改为:
clientPort=2182
z3的配置文件，将数据目录修改为:
dataDir=/ihome/java/zookeeper-3.4.8/data/z3
z3的配置文件，将客户端连接的端口修改为：
clientPort=2183
启动集群
启动节点z1:
╭─sky@sky-linux /ihome/java/zookeeper-3.4.8/data/z1
╰─➤ /ihome/java/zookeeper-3.4.8/bin/zkServer.sh start ./zoo.cfg
启动节点z2:
╭─sky@sky-linux /ihome/java/zookeeper-3.4.8/data/z2
╰─➤ /ihome/java/zookeeper-3.4.8/bin/zkServer.sh start ./zoo.cfg
启动节点z3:
╭─sky@sky-linux /ihome/java/zookeeper-3.4.8/data/z3
╰─➤ /ihome/java/zookeeper-3.4.8/bin/zkServer.sh start ./zoo.cfg
连接集群
╭─sky@sky-linux /ihome/java/zookeeper-3.4.8
╰─➤ ./bin/zkCli.sh -server 127.0.0.1:2181,127.0.0.1:2182,127.0.0.1:2183
即后面-server连接集群每个IP地址:客户端端口
客户端端口，即是上面的clientPort.
ZooKeeper的服务器搭建就这样子了.^_^
连接字符串
IP1:PORT1,IP2:PORT2,...,IPn:PORTn