ZooKeeper伪集群环境搭建

1.从官网下载程序包。

2.解压。

[dev@localhost software]$ tar xzvf zookeeper-3.4.6.tar.gz

3.进入zookeeper目录后创建data目录。

[dev@localhost software]$ cd zookeeper-3.4.6
[dev@localhost software]$ mkdir data

[dev@localhost software]$ cd data
[dev@localhost software]$ touch myid

myid这个文件必须创建，不然启动的时候会跑出下面的异常。

[dev@localhost bin]$ ./zkServer.sh start-foreground
JMX enabled by default
Using config: /home/dev/zookeeper/zookeeper1/bin/../conf/zoo.cfg
2015-03-12 16:06:38,155 [myid:] - INFO  [main:QuorumPeerConfig@101] - Reading configuration from: /home/dev/zookeeper/zookeeper1/bin/../conf/zoo.cfg
2015-03-12 16:06:38,159 [myid:] - INFO  [main:QuorumPeerConfig@334] - Defaulting to majority quorums
2015-03-12 16:06:38,161 [myid:] - ERROR [main:QuorumPeerMain@85] - Invalid config, exiting abnormally
org.apache.zookeeper.server.quorum.QuorumPeerConfig$ConfigException: Error processing /home/dev/zookeeper/zookeeper1/bin/../conf/zoo.cfg
     at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:121)
     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.IllegalArgumentException: /home/dev/zookeeper/zookeeper1/data/myid file is missing
     at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parseProperties(QuorumPeerConfig.java:344)
     at org.apache.zookeeper.server.quorum.QuorumPeerConfig.parse(QuorumPeerConfig.java:117)
     ... 2 more
Invalid config, exiting abnormally

myid文件里必须要有内容，其值对应zoo.cfg中server的id。有点绕，我也是试了好多次才配好的。也就说，假如集群的配置如下，那问题来了，怎么区分当前启动的zookeeper是哪一个呢？就是通过myid文件来区分的，第1个zookeeper服务的myid文件的内容就是1，其它就以此类推了。如果myid配错了，后果很严重——zookeeper服务起不来，O(∩_∩)O哈哈~，并且报下面的异常。

server.1=localhost:2888:3888
server.2=localhost:2889:3889
server.3=localhost:2890:3890

[dev@localhost bin]$  ./zkServer.sh start-foreground
JMX enabled by default
Using config: /home/dev/zookeeper/zookeeper2/bin/../conf/zoo.cfg
2015-03-12 16:09:35,422 [myid:] - INFO  [main:QuorumPeerConfig@101] - Reading configuration from: /home/dev/zookeeper/zookeeper2/bin/../conf/zoo.cfg
2015-03-12 16:09:35,426 [myid:] - INFO  [main:QuorumPeerConfig@334] - Defaulting to majority quorums
2015-03-12 16:09:35,434 [myid:0] - INFO  [main:DatadirCleanupManager@78] - autopurge.snapRetainCount set to 3
2015-03-12 16:09:35,434 [myid:0] - INFO  [main:DatadirCleanupManager@79] - autopurge.purgeInterval set to 0
2015-03-12 16:09:35,435 [myid:0] - INFO  [main:DatadirCleanupManager@101] - Purge task is not scheduled.
2015-03-12 16:09:35,455 [myid:0] - INFO  [main:QuorumPeerMain@127] - Starting quorum peer
2015-03-12 16:09:35,472 [myid:0] - INFO  [main:NIOServerCnxnFactory@94] - binding to port 0.0.0.0/0.0.0.0:2182
2015-03-12 16:09:35,500 [myid:0] - INFO  [main:QuorumPeer@913] - tickTime set to 2000
2015-03-12 16:09:35,501 [myid:0] - INFO  [main:QuorumPeer@933] - minSessionTimeout set to -1
2015-03-12 16:09:35,501 [myid:0] - INFO  [main:QuorumPeer@944] - maxSessionTimeout set to -1
2015-03-12 16:09:35,502 [myid:0] - INFO  [main:QuorumPeer@959] - initLimit set to 10
2015-03-12 16:09:35,519 [myid:0] - ERROR [main:QuorumPeer@171] - Setting LearnerType to PARTICIPANT but 0 not in QuorumPeers.
2015-03-12 16:09:35,530 [myid:0] - INFO  [main:QuorumPeer@429] - currentEpoch not found! Creating with a reasonable default of 0. This should only happen when you are upgrading your installation
2015-03-12 16:09:35,591 [myid:0] - INFO  [main:QuorumPeer@444] - acceptedEpoch not found! Creating with a reasonable default of 0. This should only happen when you are upgrading your installation
2015-03-12 16:09:35,598 [myid:0] - ERROR [main:QuorumPeerMain@89] - Unexpected exception, exiting abnormally
java.lang.RuntimeException: My id 0 not in the peer list
     at org.apache.zookeeper.server.quorum.QuorumPeer.startLeaderElection(QuorumPeer.java:479)
     at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:411)
     at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:151)
     at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:111)
     at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:78)

4.修改zoo.cfg文件。

在zookeeper/conf/zoo.cfg修改dataDir的目录，就是我们在第2步中创建的data目录。

在文件最后添加zookeeper集群节点地址。

server.1=localhost:2888:3888
server.2=localhost:2889:3889
server.3=localhost:2890:3890

5.其它节点配置。

好了，上面已经配置好了1个zookeeper服务，然后直接copy刚才配好的zookeeper目录两份。修改data/myid文件中的id，zoo.cfg的dataDir，clientPort。

6.然后分别启动zookeeper。

ZooKeeper伪集群环境搭建好了，不然让它静静地在那里跑着，继续捣鼓它。。。。。。