zookeeper集群搭建

下载安装包、解压

安装前需要安装好jdk

#tar -zxvf zookeeper-3.4.6.tar.gz

#mv zookeeper-3.4.6 zookeeper

修改环境变量（注意：3台zookeeper都需要修改）

vi /etc/profile
export ZOOKEEPER_HOME=/usr/local/dev/zookeeper
export PATH=$PATH:$ZOOKEEPER_HOME/bin
source /etc/profile

修改Zookeeper配置文件

#cd zookeeper/conf

#cp zoo_sample.cfg zoo.cfg

#vi zoo.cfg

修改内容：

dataDir=/usr/local/dev/zookeeper/zkdata

server.1=node1:2888:3888     ## (心跳端口、选举端口)
server.2=node2:2888:3888
server.3=node3:2888:3888

创建文件夹：

#cd /usr/local/dev/zookeeper/

#mkdir zkdata

在data文件夹下新建myid文件，myid的文件内容为：

#cd zkdata

#touch myid

#echo 1 > myid

修改hosts

    vi /etc/hosts
    
    127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    
    ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

    192.168.25.130 node1

    192.168.25.131 node2

    192.168.25.132 node3

关闭防火墙

1） 永久性生效，重启后不会复原

开启： chkconfig iptables on

关闭： chkconfig iptables off

2） 即时生效，重启后复原

开启： service iptables start

关闭： service iptables stop

查看防火墙状态：

 service iptables status

遇到的bug1

JMX enabled by default
Using config: /usr/local/dev/zookeeper-3.4.6/bin/../conf/zoo.cfg
Error contacting service. It is probably not running.
[root@node1 bin]# cat zookeeper.out
2018-01-30 05:30:14,862 [myid:] - INFO  [main:QuorumPeerConfig@103] - Reading configuration from: /usr/local/dev/zookeeper-3.4.6/bin/../conf/zoo.cfg
2018-01-30 05:30:14,868 [myid:] - ERROR [main:QuorumPeerMain@85] - Invalid config, exiting abnormally
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException: Error processing /usr/local/dev/zookeeper-3.4.6/bin/../conf/zoo.cfg
        at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:123)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:101)
        at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)
Caused by: java.lang.NumberFormatException: For input string: "3888     ## (�跳端���举端�)"
        at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
        at java.lang.Integer.parseInt(Integer.java:492)
        at java.lang.Integer.parseInt(Integer.java:527)
        at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parseProperties(QuorumPeerConfig.java:193)
        at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:119)
        ... 2 more
Invalid config, exiting abnormally
[root@node1 bin]# cd ../conf

根据提示：修改conf/zoo.cfg 删除 ##注释

遇到的bug2

2018-01-30 05:32:07,064 [myid:1] - INFO  [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 1 (n.leader), 0x0 (n.zxid), 0x1 (n.round), LOOKING (n.state), 1 (n.sid), 0x0 (n.peerEpoch) LOOKING (my state)
2018-01-30 05:32:07,067 [myid:1] - WARN  [WorkerSender[myid=1]:QuorumCnxManager@382] - Cannot open channel to 2 at election address node2/192.168.25.131:3888
java.net.NoRouteToHostException: No route to host
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:579)
        at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368)
        at org.apache.zookeeper.server.quorum.QuorumCnxManager.toSend(QuorumCnxManager.java:341)
        at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.process(FastLeaderElection.java:449)
        at org.apache.zookeeper.server.quorum.FastLeaderElection$Messenger$WorkerSender.run(FastLeaderElection.java:430)
        at java.lang.Thread.run(Thread.java:745)
2018-01-30 05:32:19,724 [myid:1] - WARN  [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:QuorumCnxManager@382] - Cannot open channel to 3 at election address node3/192.168.25.132:3888
java.net.NoRouteToHostException: No route to host
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:579)
        at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectOne(QuorumCnxManager.java:368)
        at org.apache.zookeeper.server.quorum.QuorumCnxManager.connectAll(QuorumCnxManager.java:402)
        at org.apache.zookeeper.server.quorum.FastLeaderElection.lookForLeader(FastLeaderElection.java:840)
        at org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:762)
2018-01-30 05:32:19,724 [myid:1] - INFO  [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@849] - Notification time out: 12800

关闭防火墙即可

[root@node1 bin]# service iptables stop
iptables: Setting chains to policy ACCEPT: filter          [  OK  ]
iptables: Flushing firewall rules:                         [  OK  ]
iptables: Unloading modules:                               [  OK  ]
[root@node1 bin]# service iptables status
iptables: Firewall is not running.

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