[ERR] Node 172.16.6.154:7002 is not empty. Either the node already knows other nodes (check with CLUSTER NODES) or contains some key in database 0.
关于启动redis集群时：
[ERR] Node 172.168.63.202:7001 is not empty. Either the nodealready knows other nodes (check with CLUSTER NODES) or contains some
的问题
解决办法：
1)将每个节点下aof、rdb、nodes.conf本地备份文件删除；
rm -rf appendonly.aof
rm -rf dump.rdb
rm -rf nodes.conf
2)172.168.63.201:7001> flushdb #清空当前数据库(可省略)
3)之后再执行脚本，成功执行；
这里解释一下dump.rdb文件：
dump.rdb是由Redis服务器自动生成的 默认情况下 每隔一段时间redis服务器程序会自动对数据库做一次遍历，把内存快照写在一个叫做“dump.rdb”的文件里，这个持久化机制叫做SNAPSHOT。有了SNAPSHOT后，如果服务器宕机，重新启动redis服务器程序时redis会自动加载dump.rdb，将数据库状态恢复到上一次做SNAPSHOT时的状态。
SNAPSHOT即快照
重新启动redis集群，成功
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