Redis MISCONF Redis is configured to save RDB snapshots but is currently not able to persist on disk

r囧r小猫 2022-02-05 07:13 84阅读 0赞

> ### 该错误信息是Redis客户端工具在保存数据时候抛出的异常信息 ###

**【解决方案一】：**

root@ubuntu:/usr/local/redis/bin# ./redis-cli
    127.0.0.1:6379> config set stop-writes-on-bgsave-error no
    OK

**很多人都是建议“config set stop-writes-on-bgsave-error no”。这样做其实是不好的，这仅仅是让程序忽略了这个异常，使得程序能够继续往下运行，但实际上数据还是会存储到硬盘失败！ **

**【解决方案二】： **

**由于Redis是daemon模式运行的，没法看到详细的日志。修改配置文件设置logfile参数为文件（默认是stdout，建议以后安装完毕就修改这个参数为文件，不然会丢掉很多重要信息），重启Redis，查看日志，看到程序启动时就有一行警告提示**

**再启动Redis客户端，程序保存数据时继续报“MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk”异常，再查看Redis日志，看到有这样的错误提示“Can’t save in background: fork: Cannot allocate memory”，这个提示很明显"Fork进程时内存不够用了！"（还是内存的问题）。**

**在配置文件/etc/sysctl.conf 中添加**

vm.overcommit_memory = 1

**简单解释：Redis在保存数据到硬盘时为了避免主进程假死，需要Fork一份主进程，然后在Fork进程内完成数据保存到硬盘的操作，如果主进程使用了4GB的内存，Fork子进程的时候需要额外的4GB，此时内存就不够了，Fork失败，进而数据保存硬盘也失败了。 详细本质解释：**[从Redis的数据丢失说起][Redis]

**【参考文献】：**[ Redis ＂MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk＂问题的解决(转)][Redis _MISCONF Redis is configured to save RDB snapshots_ but is currently not able to persist on disk]

**附： [Redis启动、停止、查看命令][Redis 1]**

[Redis]: https://www.linuxidc.com/Linux/2012-07/66079.htm
[Redis _MISCONF Redis is configured to save RDB snapshots_ but is currently not able to persist on disk]: https://www.cnblogs.com/qq78292959/p/3994349.html
[Redis 1]: https://blog.csdn.net/u013519290/article/details/73196370/

Redis MISCONF Redis is configured to save RDB snapshots but is currently not able to persist on disk

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