--------2013/12/24
配了大半天的redis集群，居然还没有成功。一开始看起来挺顺利的，依着教程(Redis 命令参考 Release2.8-huangz)，先是下载最新版本redis(https://github.com/antirez/redis，不是release版本，还在开发阶段)，编译之后生成可执行文件redis-server。
然后创建监听不同端口的redis实例,一共开了6个端口,7000至7005。最后在运行命令，把各个实例连接通讯成为集群时(3个主节点，3个从节点)时，报了这个错误:
root@XIAOMO:/opt/cluster_test/redis-unstable/src# src/redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- redis (LoadError) from /usr/lib/ruby/1.9.1/rubygems/custom_require.rb:36:in `require' from /opt/cluster_test/redis-unstable/src/redis-trib.rb:25:in `<main>'
ruby重新安装了几遍，redis环境变量也改了，似乎还是没有解决问题。这种问题一般都是版本不对或是环境变量没配好引起的；从错误输出看来，像是redis配置的问题。查阅了大部分论坛，也还没找到一个有效的方案，只能等到明天继续折腾了。
也希望有人帮忙指点一下啦~~
--------2013/12/25
折腾了这么久，原来是没装redis的第三方接口！既然ruby程序要访问redis数据库，总得有个连接接口。对于ruby这么安装client包就行了:
root@XIAOMO:~# gem install redis Fetching: redis-3.0.6.gem (100%) Successfully installed redis-3.0.6 1 gem installed Installing ri documentation for redis-3.0.6... Installing RDoc documentation for redis-3.0.6... root@XIAOMO:~#
安装成功后，集群最后一步搭建也就可以继续了:
root@XIAOMO:/cluster_test/redis-unstable/src# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005 >>> Creating cluster Connecting to node 127.0.0.1:7000: OK Connecting to node 127.0.0.1:7001: OK Connecting to node 127.0.0.1:7002: OK Connecting to node 127.0.0.1:7003: OK Connecting to node 127.0.0.1:7004: OK Connecting to node 127.0.0.1:7005: OK >>> Performing hash slots allocation on 6 nodes... Using 3 masters: 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7000 replica #1 is 127.0.0.1:7003 127.0.0.1:7001 replica #1 is 127.0.0.1:7004 127.0.0.1:7002 replica #1 is 127.0.0.1:7005 M: fc65c271d01fd2151da15f08d7af14e2be8c18c2 127.0.0.1:7000 slots:0-5460 (5461 slots) master M: 5b487aa64fee6fd2322d16a3fd1633944bab58f2 127.0.0.1:7001 slots:5461-10921 (5461 slots) master M: 2e9be1c7a4af976d678ef26a91dda37c1623d445 127.0.0.1:7002 slots:10922-16383 (5462 slots) master S: a8cdcf9756b2e8334c28190d8de95375551c6a8a 127.0.0.1:7003 S: e4f044404413eb1dddef513500beca1e554e760a 127.0.0.1:7004 S: 5628c2985cb8612883b921e24982409bf87d17e0 127.0.0.1:7005 Can I set the above configuration? (type 'yes' to accept): yes >>> Nodes configuration updated >>> Sending CLUSTER MEET messages to join the cluster Waiting for the cluster to join... >>> Performing Cluster Check (using node 127.0.0.1:7000) M: fc65c271d01fd2151da15f08d7af14e2be8c18c2 127.0.0.1:7000 slots:0-5460 (5461 slots) master M: 5b487aa64fee6fd2322d16a3fd1633944bab58f2 127.0.0.1:7001 slots:5461-10921 (5461 slots) master M: 2e9be1c7a4af976d678ef26a91dda37c1623d445 127.0.0.1:7002 slots:10922-16383 (5462 slots) master M: a8cdcf9756b2e8334c28190d8de95375551c6a8a 127.0.0.1:7003 slots: (0 slots) master M: e4f044404413eb1dddef513500beca1e554e760a 127.0.0.1:7004 slots: (0 slots) master M: 5628c2985cb8612883b921e24982409bf87d17e0 127.0.0.1:7005 slots: (0 slots) master [OK] All nodes agree about slots configuration. >>> Check for open slots... >>> Check slots coverage... [OK] All 16384 slots covered.
查看集群目前情况:
root@XIAOMO:/cluster_test/redis-unstable/src# redis-cli -c -p 7000 127.0.0.1:7000> 127.0.0.1:7000> cluster info cluster_state:ok cluster_slots_assigned:16384 cluster_slots_ok:16384 cluster_slots_pfail:0 cluster_slots_fail:0 cluster_known_nodes:6 cluster_size:3 cluster_current_epoch:0 cluster_stats_messages_sent:8770 cluster_stats_messages_received:8770 127.0.0.1:7000>
到此为止，集群搭建成功。目前最新的2.8稳定版是还不支持分布式架构，在2.9中将会支持，一起期待吧~