MISCONF Redis is configured to save RDB snapshots, but it is currently not a

开发环境最近遇到了"MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk"的问题，服务出现了问题，一看日志是Redis在报这个错误。

查了查网上的资料，解决方案基本都是修改Redis的配置文件，将

stop-writes-on-bgsave-error yes修改为 stop-writes-on-bgsave-error no

这是一个暂时性的解决方法。看了看stackoverflow上的回答，最高赞回答是这样的，如下图：

大概意思是：这是一个快速应急方法，如果你担心你的数据，那就首先检查下bgsave方法为什么会失败。bgsave方法是干什么的呢？咱来看下面这张图：

bgsave方法为什么会失败呢？咱们看看大佬的回答

大概意思是（翻译不到位的地方，还请见谅，英文比较菜）：在BGSAVE时，Redis会fork一个子进程，把数据保存到硬盘上。你可以通过查看日志来获取BGSAVE失败的原因（Linux系统里Redis日志文件通常是在/var/log/redis/redis-server.log），大多数时候BGSAVE失败的原因是fork进程分配不到内存。更多时候，fork进程分配不到内存是因为跟操作系统的优化相冲突，即使操作系统有足够的内存。（下面一大段就不翻译了，意思是可以Redis官网找到相应的解释，文末会把相关文章链接都缀上）。当然大神也给出了解决方案

Linux系统中，修改/etc/sysctl.conf文件，添加配置：

vm.overcommit_memory=1

执行命令，使其生效

sudo sysctl -p /etc/sysctl.conf

参考文章链接：

stackoverflow的回答链接

BGSAVE命令解释

redis官网的faq

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