redis 有如标题所示提示， 可从两方面查找原因：

一， 可以看一下，运行redis实例的用户， 是否对redis， 数据保存的目录有写权限(既然是排查错误，不防把redis所在目录权限最大化试一下)

二， 可以参考 此篇文章 的内容， 在 /etc/sysctl.conf 此文件里[不是redis配置文件哟]， 最后一行添加 vm.overcommit_memory = 1 然后重启(或者运行命令'sysctl vm.overcommit_memory=1' )， 使其生效

学习点： 1, 要了解并知道 redis 配置文件 里配置项的意思  2, 对操作系统内存的分配置可以关注并了解一下

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