初识zookeeper（一）之zookeeper的安装及配置

1、简要介绍

　　zookeeper是一个分布式的应用程序协调服务，是Hadoop和Hbase的重要组件，是一个树型的目录服务，支持变更推送。除此还可以用作dubbo服务的注册中心。

2、安装

　　2.1 下载安装

wget http://mirrors.cnnic.cn/apache/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gztar -zxvf zookeeper-3.4.6.tar.gzcd zookeeper-3.4.6cp conf/zoo_sample.cfg conf/zoo.cfg

　　2.2 配置

　　　　2.2.1 单点方式

　　　　（1）修改zoo.cfg，如果没有特殊要求，全部默认也可以，主要修改的地方就是dataDir 和 clientPort，如下：

tickTime=2000initLimit=10syncLimit=5dataDir=/app/soft/zookeeper-3.4.6/data （换成真实输出目录）clientPort=2181
#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，以毫秒为单位。
#initLimit：LF初始通信时限，集群中的follower服务器(F)与leader服务器(L)之间初始连接时能容忍的最多心跳数（tickTime的数量）
#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心跳数（tickTime的数量）。
#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。
#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。　　　
#dataLogDir：日志文件目录，Zookeeper保存日志文件的目录
#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），规则如：server.N=yyy:A:B
#其中N表示服务器编号，YYY表示服务器的IP地址，A为LF通信端口，表示该服务器与集群中的leader交换的信息的端口。B为选举端口，表示选举新leader时服务器间相互通信的端口（当leader挂掉时，其余服务器会相互通信，选择出新的leader）。一般来说，集群中每个服务器的A端口都是一样，每个服务器的B端口也是一样。但是当所采用的为伪集群时，IP地址都一样，只能时A端口和B端口不一样。

　　　　（2）启动：bin/zkServer.sh start

　　　　（3）查看是否成功：bin/zkServer.sh status

　　　　（4）查看日志：vi zooKeeper.out

　　　　2.2.2 集群方式（单IP多节点）

　　　　（1）拷贝3份zookeeper-3.4.6.tar.gz，如zookeeper_node1、zookeeper_node2、zookeeper_node3，结构如下：

　　　　　　
　　　　（2）进入zookeeper_node1--->conf，修改zoo.cfg，如下：

tickTime=2000initLimit=10syncLimit=5dataDir=/app/soft/zookeeper_node1/data （换成真实输出目录）clientPort=2181server.1=127.0.0.1:2888:3888server.2=127.0.0.1:2889:3889
server.3=127.0.0.1:2890:3890

　　　　（3）然后在上面dataDir对应的目录下创建myid文件，如下：

mkdir datavi myid

　　　　myid指明自己的id，对应上面zoo.cfg中"server."后的数字，第一台的内容为1，第二台的内容为2，第三台的内容为3，内容如下：

1

　　　　（4）依次类推，调整2、3节点的地址及端口，如下：

节点2：　　　　　　

tickTime=2000initLimit=10syncLimit=5dataDir=/app/soft/zookeeper_node2/data （换成真实输出目录）clientPort=2182server.1=127.0.0.1:2888:3888server.2=127.0.0.1:2889:3889server.3=127.0.0.1:2890:3890

节点3：

tickTime=2000initLimit=10syncLimit=5dataDir=/app/soft/zookeeper_node3/data （换成真实输出目录）clientPort=2183server.1=127.0.0.1:2888:3888server.2=127.0.0.1:2889:3889server.3=127.0.0.1:2890:389

　　　　（5），修改节点2、3的myid；　　　　　　

　　　　（6）启动服务，如下：　　

[root@localhost soft]# zookeeper_node1/bin/zkServer.sh startJMX enabled by defaultUsing config: /app/soft/zookeeper_node1/bin/../conf/zoo.cfgStarting zookeeper ... STARTED[root@localhost soft]# vi zookeeper.out 2015-06-25 05:43:13,252 [myid:] - INFO [main:QuorumPeerConfig@103] - Reading configuration from: /app/soft/zookeeper_nod2015-06-25 05:43:13,257 [myid:] - INFO [main:QuorumPeerConfig@340] - Defaulting to majority quorums2015-06-25 05:43:13,260 [myid:1] - INFO [main:DatadirCleanupManager@78] - autopurge.snapRetainCount set to 32015-06-25 05:43:13,260 [myid:1] - INFO [main:DatadirCleanupManager@79] - autopurge.purgeInterval set to 02015-06-25 05:43:13,262 [myid:1] - INFO [main:DatadirCleanupManager@101] - Purge task is not scheduled.2015-06-25 05:43:13,273 [myid:1] - INFO [main:QuorumPeerMain@127] - Starting quorum peer2015-06-25 05:43:13,285 [myid:1] - INFO [main:NIOServerCnxnFactory@94] - binding to port 0.0.0.0/0.0.0.0:21812015-06-25 05:43:13,312 [myid:1] - INFO [main:QuorumPeer@959] - tickTime set to 20002015-06-25 05:43:13,312 [myid:1] - INFO [main:QuorumPeer@979] - minSessionTimeout set to -12015-06-25 05:43:13,312 [myid:1] - INFO [main:QuorumPeer@990] - maxSessionTimeout set to -12015-06-25 05:43:13,315 [myid:1] - INFO [main:QuorumPeer@1005] - initLimit set to 102015-06-25 05:43:13,359 [myid:1] - INFO [Thread-1:QuorumCnxManager$Listener@504] - My election bind port: /127.0.0.1:3882015-06-25 05:43:13,371 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:QuorumPeer@714] - LOOKING2015-06-25 05:43:13,374 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@815] - New election.2015-06-25 05:43:13,252 [myid:] - INFO [main:QuorumPeerConfig@103] - Reading configuration from: /app/soft/zookeeper_node1/bin/../conf/zoo.cfg2015-06-25 05:43:13,257 [myid:] - INFO [main:QuorumPeerConfig@340] - Defaulting to majority quorums2015-06-25 05:43:13,260 [myid:1] - INFO [main:DatadirCleanupManager@78] - autopurge.snapRetainCount set to 32015-06-25 05:43:13,260 [myid:1] - INFO [main:DatadirCleanupManager@79] - autopurge.purgeInterval set to 02015-06-25 05:43:13,262 [myid:1] - INFO [main:DatadirCleanupManager@101] - Purge task is not scheduled.2015-06-25 05:43:13,273 [myid:1] - INFO [main:QuorumPeerMain@127] - Starting quorum peer2015-06-25 05:43:13,285 [myid:1] - INFO [main:NIOServerCnxnFactory@94] - binding to port 0.0.0.0/0.0.0.0:21812015-06-25 05:43:13,312 [myid:1] - INFO [main:QuorumPeer@959] - tickTime set to 20002015-06-25 05:43:13,312 [myid:1] - INFO [main:QuorumPeer@979] - minSessionTimeout set to -12015-06-25 05:43:13,312 [myid:1] - INFO [main:QuorumPeer@990] - maxSessionTimeout set to -12015-06-25 05:43:13,315 [myid:1] - INFO [main:QuorumPeer@1005] - initLimit set to 102015-06-25 05:43:13,359 [myid:1] - INFO [Thread-1:QuorumCnxManager$Listener@504] - My election bind port: /127.0.0.1:38882015-06-25 05:43:13,371 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:QuorumPeer@714] - LOOKING2015-06-25 05:43:13,374 [myid:1] - INFO [QuorumPeer[myid=1]/0:0:0:0:0:0:0:0:2181:FastLeaderElection@815] - New election. My id = 1, proposed zxid=0x22015-06-25 05:43:13,376 [myid:1] - INFO [WorkerReceiver[myid=1]:FastLeaderElection@597] - Notification: 1 (message format version), 1 (n.leader), 0x2 (n.zxid), 0x1 (n.round), LOOKING (n.state), 1 (n.sid), 0x1 (n.peerEpoch) LOOKING (my state)2015-06-25 05:43:13,379 [myid:1] - WARN [WorkerSender[myid=1]:QuorumCnxManager@382] - Cannot open channel to 2 at election address /127.0.0.1:3889java.net.ConnectException: Connection refused    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)2015-06-25 05:43:13,385 [myid:1] - WARN [WorkerSender[myid=1]:QuorumCnxManager@382] - Cannot open channel to 3 at election address /127.0.0.1:3890java.net.ConnectException: Connection refused    at java.net.PlainSocketImpl.socketConnect(Native Method)    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)

　　　　发现报错，是因为2、3节点服务还未启动。按照节点1的启动方式，依次启动2、3节点，再次查看日志，发现服务正常。

　　　　查看日志命令：vi zookeeper.out

　　　　（7）查看服务状态，如下：　　　　

[root@localhost soft]# zookeeper_node1/bin/zkServer.sh statusJMX enabled by defaultUsing config: /app/soft/zookeeper_node1/bin/../conf/zoo.cfgMode: follower[root@localhost soft]# zookeeper_node2/bin/zkServer.sh statusJMX enabled by defaultUsing config: /app/soft/zookeeper_node2/bin/../conf/zoo.cfgMode: leader[root@localhost soft]# zookeeper_node3/bin/zkServer.sh statusJMX enabled by defaultUsing config: /app/soft/zookeeper_node3/bin/../conf/zoo.cfgMode: follower

　　　　　　可以看出1是follower，2是leader，3是follower。

原标题：初识zookeeper（一）之zookeeper的安装及配置

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