Redis主從配置異常解決：Error condition on socket for SYNC: Connection refused

在Docker中搭建的Redis主從叢集時，從伺服器上的redis日誌報錯：

32677:S 08 Feb 16:14:38.947 * Connecting to MASTER 172.168.10.70:6379
32677:S 08 Feb 16:14:38.948 * MASTER <-> SLAVE sync started
32677:S 08 Feb 16:14:38.948 # Error condition on socket for
 
 SYNC: Connection refused
32677:S 08 Feb 16:14:39.950 * Connecting to MASTER 172.168.10.70:6379
32677:S 08 Feb 16:14:39.950 * MASTER <-> SLAVE sync started
32677:S 08 Feb 16:14:39.950 # Error condition on socket for SYNC: Connection refused
32677:S 08 Feb 16:14:40.952 * Connecting to MASTER 172.168.10.70:6379
 

32677:S 08 Feb 16:14:40.952 * MASTER <-> SLAVE sync started
32677:S 08 Feb 16:14:40.953 # Error condition on socket for SYNC: Connection refused

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解決方案： 
在redis主伺服器上的redis.conf中修改bind欄位，將

bind 127.0.0.1

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修改為

bind 0.0.0.0

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又或者直接註釋掉bind欄位

# bind 127.0.0.1

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原因： 
如果redis主伺服器綁定了127.0.0.1，那麼跨伺服器IP的訪問就會失敗，從伺服器用IP和埠訪問主的時候，主伺服器發現本機6379埠綁在了127.0.0.1上，也就是隻能本機才能訪問，外部請求會被過濾，這是