redis-trib.rb是redis官方推出的管理redis集群的工具，集成在redis的源码src目录下，是基于redis提供的集群命令封装成简单、便捷、实用的操作工具。redis-trib.rb是redis作者用ruby完成的。 其中一个rebalance，使用非常多，在扩容节点后需要进行均衡slot的自动均衡，做slot迁移。但由于这个功能在3.0.6的版本中才有，为什么这个版本才有的原因，可能是之前不支持mutil migrate的原因。
如果需要在3.0.6以前的版本，或者redis集群中存在3.0.6以前的版本，那和就无法使用这个工具的rebalance工具，比较遗憾。但不不要紧，这里这这个脚本是可以进行rebalance的，只不过速度没有在3.0.6以及以上版本那么快。
git地址：[https://github.com/beebol/redis-trib.rb](https://github.com/beebol/redis-trib.rb)
3.0.6以前版本使用工具报如下错误：
redis-trib.rb rebalance --threshold 1 --use-empty-masters 127.0.0.1:9001
Performing Cluster Check (using node 127.0.0.1:9001) [OK]
All nodes agree about slots configuration.
Check for open slots...
Check slots coverage... [OK]
All 16384 slots covered.
Rebalancing across 5 nodes.
Total weight = 5
Moving 820 slots from 127.0.0.1:9003 to 127.0.0.1:9005
[ERR] ERR syntax error ···
下载使用后不会报这个问题了。
使用，下载后在可以运行的redis-trib.rb机器上直接可执行。
git上的版本，只是在move_slot处将mutil migrate改成migrate方式 ,因为3.0.6才支持mutil migrate，如果是以下版本就无法使用官方的版本，可以用这个版本。但如果redis版本都是3.0.6以上，那建议还是用官方的版本。
文章最后更新时间：
2017年07月30日 05:54:57
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