zookeeper伪分布式安装

本文介绍zookeeper伪分布式安装。

所谓 “伪分布式集群” 就是在1台PC中启动多个zookeeper的实例。“完全分布式集群” 是每1台PC启动1个ZooKeeper实例。

由于我的测试环境PC数量有限，所以在1台PC中启动3个zookeeper的实例。下面以3个节点为例，介绍安装的过程

新建3个文件夹

[work@xxx zookeeper-3.4.6]$ mkdir zoo_1 zoo_2 zoo_3

复制配置文件

[work@xxx conf]$ cp zoo.cfg zoo1.cfg
[work@xxx conf]$ cp zoo.cfg zoo2.cfg  
[work@xxx conf]$ cp zoo.cfg zoo3.cfg

修改配置文件

3个节点的配置文件分别如下，注意修改路径和端口

介绍一下配置文件里面的字段含义：

1、tickTime：这个时间是作为 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

2、dataDir：顾名思义就是 Zookeeper 保存数据的目录，默认情况下，Zookeeper 将写数据的日志文件也保存在这个目录里

3、clientPort：这个端口就是客户端连接 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

4、initLimit：这个配置项是用来配置 Zookeeper 接受客户端（这里所说的客户端不是用户连接 Zookeeper 服务器的客户端，而是 Zookeeper 服务器集群中连接到 Leader 的 Follower 服务器）初始化连接时最长能忍受多少个心跳时间间隔数。当已经超过 5个心跳的时间（也就是 tickTime）长度后 Zookeeper 服务器还没有收到客户端的返回信息，那么表明这个客户端连接失败。总的时间长度就是 5 * 2000 = 10 秒

5、syncLimit：这个配置项标识 Leader 与 Follower 之间发送消息，请求和应答时间长度，最长不能超过多少个 tickTime 的时间长度，总的时间长度就是 2 * 2000 = 4 秒

6、server.A=B：C：D：其中 A 是一个数字，表示这个是第几号服务器；B 是这个服务器的 ip 地址；C 表示的是这个服务器与集群中的 Leader 服务器交换信息的端口；D 表示的是万一集群中的 Leader 服务器挂了，需要一个端口来重新进行选举，选出一个新的 Leader，而这个端口就是用来执行选举时服务器相互通信的端口。如果是伪集群的配置方式，由于 B 都是一样，所以不同的 Zookeeper 实例通信端口号不能一样，所以要给它们分配不同的端口号

写入myid

[work@xxx zookeeper-3.4.6]$ echo "1" > zoo_1/myid
[work@xxx zookeeper-3.4.6]$ echo "2" > zoo_2/myid   
[work@xxx zookeeper-3.4.6]$ echo "3" > zoo_3/myid

启动

[work@xxx zookeeper-3.4.6]$ bin/zkServer.sh start zoo1.cfg
JMX enabled by default
Using config: /home/work/soft/zookeeper-3.4.6/bin/../conf/zoo1.cfg
Starting zookeeper ... STARTED

[work@xxx zookeeper-3.4.6]$ bin/zkServer.sh start zoo2.cfg
JMX enabled by default
Using config: /home/work/soft/zookeeper-3.4.6/bin/../conf/zoo2.cfg
Starting zookeeper ... STARTED

[work@xxx zookeeper-3.4.6]$ bin/zkServer.sh start zoo3.cfg
JMX enabled by default
Using config: /home/work/soft/zookeeper-3.4.6/bin/../conf/zoo3.cfg
Starting zookeeper ... STARTED

查看状态
[work@xxx zookeeper-3.4.6]$ bin/zkServer.sh status zoo1.cfg   
JMX enabled by default
Using config: /home/work/soft/zookeeper-3.4.6/bin/../conf/zoo1.cfg
Mode: follower

[work@xxx zookeeper-3.4.6]$ bin/zkServer.sh status zoo2.cfg
JMX enabled by default
Using config: /home/work/soft/zookeeper-3.4.6/bin/../conf/zoo2.cfg
Mode: leader

[work@xxx zookeeper-3.4.6]$ bin/zkServer.sh status zoo3.cfg
JMX enabled by default
Using config: /home/work/soft/zookeeper-3.4.6/bin/../conf/zoo3.cfg
Mode: follower

可以发现zoo_2被选为了leader

查看目录

[work@xxx zookeeper-3.4.6]$ tree zoo_1   
zoo_1
|-- myid
|-- version-2
|   |-- acceptedEpoch
|   |-- currentEpoch
|   `-- snapshot.0
`-- zookeeper_server.pid

1 directory, 5 files

[work@xxx zookeeper-3.4.6]$ tree zoo_2
zoo_2
|-- myid
|-- version-2
|   |-- acceptedEpoch
|   `-- currentEpoch
`-- zookeeper_server.pid

1 directory, 4 files

[work@xxx zookeeper-3.4.6]$ tree zoo_3
zoo_3
|-- myid
|-- version-2
|   |-- acceptedEpoch
|   |-- currentEpoch
|   `-- snapshot.100000000
`-- zookeeper_server.pid

1 directory, 5 files
[work@xxx zookeeper-3.4.6]$

安装成功后，用cli测试一下，一直报下面这个SB错误！

[work@xxx zookeeper-3.4.6]$ bin/zkCli.sh -server 127.0.0.1:2182
Connecting to 127.0.0.1:2182
2018-01-05 21:32:45,482 [myid:] - INFO  [main:Environment@100] - Client environment:zookeeper.version=3.4.6-1569965, built on 02/20/2014 09:09 GMT
2018-01-05 21:32:45,485 [myid:] - INFO  [main:Environment@100] - Client environment:host.name=xxx
2018-01-05 21:32:45,486 [myid:] - INFO  [main:Environment@100] - Client environment:java.version=1.7.0_111
2018-01-05 21:32:45,488 [myid:] - INFO  [main:Environment@100] - Client environment:java.vendor=Oracle Corporation
2018-01-05 21:32:45,488 [myid:] - INFO  [main:Environment@100] - Client environment:java.home=/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.111.x86_64/jre
2018-01-05 21:32:45,488 [myid:] - INFO  [main:Environment@100] - Client environment:java.class.path=/home/work/soft/zookeeper-3.4.6/bin/../build/classes:/home/work/soft/zookeeper-3.4.6/bin/../build/lib/*.jar:/home/work/soft/zookeeper-3.4.6/bin/../lib/slf4j-log4j12-1.6.1.jar:/home/work/soft/zookeeper-3.4.6/bin/../lib/slf4j-api-1.6.1.jar:/home/work/soft/zookeeper-3.4.6/bin/../lib/netty-3.7.0.Final.jar:/home/work/soft/zookeeper-3.4.6/bin/../lib/log4j-1.2.16.jar:/home/work/soft/zookeeper-3.4.6/bin/../lib/jline-0.9.94.jar:/home/work/soft/zookeeper-3.4.6/bin/../zookeeper-3.4.6.jar:/home/work/soft/zookeeper-3.4.6/bin/../src/java/lib/*.jar:/home/work/soft/zookeeper-3.4.6/bin/../conf:
2018-01-05 21:32:45,488 [myid:] - INFO  [main:Environment@100] - Client environment:java.library.path=/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
2018-01-05 21:32:45,488 [myid:] - INFO  [main:Environment@100] - Client environment:java.io.tmpdir=/tmp
2018-01-05 21:32:45,488 [myid:] - INFO  [main:Environment@100] - Client environment:java.compiler=<NA>
2018-01-05 21:32:45,488 [myid:] - INFO  [main:Environment@100] - Client environment:os.name=Linux
2018-01-05 21:32:45,489 [myid:] - INFO  [main:Environment@100] - Client environment:os.arch=amd64
2018-01-05 21:32:45,489 [myid:] - INFO  [main:Environment@100] - Client environment:os.version=3.10.0_1-0-0-8
2018-01-05 21:32:45,489 [myid:] - INFO  [main:Environment@100] - Client environment:user.name=work
2018-01-05 21:32:45,489 [myid:] - INFO  [main:Environment@100] - Client environment:user.home=/home/work
2018-01-05 21:32:45,489 [myid:] - INFO  [main:Environment@100] - Client environment:user.dir=/home/work/soft/zookeeper-3.4.6
2018-01-05 21:32:45,490 [myid:] - INFO  [main:ZooKeeper@438] - Initiating client connection, connectString=127.0.0.1:2182 sessionTimeout=30000 watcher=org.apache.zookeeper.ZooKeeperMain$MyWatcher@7a04c4aa
Welcome to ZooKeeper!
2018-01-05 21:32:45,519 [myid:] - INFO  [main-SendThread(127.0.0.1:2182):ClientCnxn$SendThread@975] - Opening socket connection to server 127.0.0.1/127.0.0.1:2182. Will not attempt to authenticate using SASL (unknown error)
2018-01-05 21:32:45,525 [myid:] - WARN  [main-SendThread(127.0.0.1:2182):ClientCnxn$SendThread@1102] - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:744)
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
JLine support is enabled
[zk: 127.0.0.1:2182(CONNECTING) 0] 2018-01-05 21:32:46,629 [myid:] - INFO  [main-SendThread(127.0.0.1:2182):ClientCnxn$SendThread@975] - Opening socket connection to server 127.0.0.1/127.0.0.1:2182. Will not attempt to authenticate using SASL (unknown error)
2018-01-05 21:32:46,630 [myid:] - WARN  [main-SendThread(127.0.0.1:2182):ClientCnxn$SendThread@1102] - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:744)
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
2018-01-05 21:32:47,731 [myid:] - INFO  [main-SendThread(127.0.0.1:2182):ClientCnxn$SendThread@975] - Opening socket connection to server 127.0.0.1/127.0.0.1:2182. Will not attempt to authenticate using SASL (unknown error)
2018-01-05 21:32:47,731 [myid:] - WARN  [main-SendThread(127.0.0.1:2182):ClientCnxn$SendThread@1102] - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.net.ConnectException: Connection refused
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:744)
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

在网上查了很久也没有找到解决方法，但是用cli连接单节点的zookeeper是没有问题的，奇怪！

参考了http://blog.itpub.net/12219480/viewspace-1778740/ 里面的说明，不过没有验证，先贴到下面：

1、zookeeper配置完毕之候报错，信息如下：

			grid@master1:~$ zkCli.sh -server 10.10.10.70:2181
			..............................
			2015-08-21 06:29:48,412 [myid:] - INFO [main-SendThread(10.10.10.70:2181):ClientCnxn$SendThread@975] - Opening socket connection to server 10.10.10.70/10.10.10.70:2181. Will not attempt to authenticate using SASL (unknown error)
			Welcome to
			2015-08-21 06:29:48,420 [myid:] - WARN [main-SendThread(10.10.10.70:2181):ClientCnxn$SendThread@1102] - Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
			java.net.ConnectException: Connection refused
			        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
			        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:739)
			        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361)
			        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)

这是连接zookeeper的server一直不断的报错
2、查看zookeeper配置信息

			grid@master1:/usr/local/zookeeper/conf$ cat 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=/data/zk
			dataLogDir=/data/zk/logs
			# 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.70=10.10.10.70:2888:3888
			server.71=10.10.10.71:2888:3888
			server.72=10.10.10.72:2888:3888
			server.73=10.10.10.73:2888:3888

2、在每个服务器上更改myid文件，如10.10.10.70文件

70

之后启动zookeeper，服务正常

本文参考自：

https://www.cnblogs.com/haippy/archive/2012/07/19/2599989.html

http://blog.csdn.net/chengwenyao18/article/details/23611995

https://www.cnblogs.com/driftingshine/p/6649104.html

http://blog.itpub.net/12219480/viewspace-1778740/