redis sentinel 高可用架構

參考 http://www.javashuo.com/article/p-yvcpjtzi-ea.html http://www.cnblogs.com/xuanzhi201111/p/5249626.htmlhtml Redis的高可用架構有好比keepalived+redis，redis cluster，twemproxy，codis，下面咱們主要針對Redis Sentinel高可用架構展開

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