laravel redis报错 MISCONF Redis is configured to save RDB snapshots

a26637896

已于 2023-03-21 08:50:35 修改

阅读量294

点赞数

文章标签： redis

于 2023-03-14 10:56:43 首次发布

本文链接：https://blog.youkuaiyun.com/a26637896/article/details/129519656

版权

文章描述了一个Redis服务由于配置问题导致无法保存RDB快照的错误，具体表现为内存不足，无法执行fork操作进行后台保存。此问题影响了Laravel应用的正常运行，错误日志显示在尝试保存时频繁出现Cantsaveinbackground:fork:Cannotallocatememory。解决方案包括增加Redis可用内存、检查服务器整体内存使用情况以及优化数据添加操作。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

Predis\Response\ServerException: MISCONF Redis is configured to save RDB snapshots, but is currently not able to persist on disk. Commands that may modify the data set are disabled. Please check Redis logs for details about the error.

laravel错误日志：

[2023-03-14 04:48:04] local.ERROR: Predis\Response\ServerException: 
MISCONF Redis is configured to save RDB snapshots, 
but is currently not able to persist on disk. 
Commands that may modify the data set are disabled. 
Please check Redis logs for details about the error. 
in /vendor/predis/predis/src/Client.php:370

redis错误日志：

8302:M 14 Mar 08:57:20.098 * 10 changes in 300 seconds. Saving...
8302:M 14 Mar 08:57:20.098 # Can't save in background: fork: Cannot allocate memory
8302:M 14 Mar 08:57:26.014 * 10 changes in 300 seconds. Saving...
8302:M 14 Mar 08:57:26.014 # Can't save in background: fork: Cannot allocate memory
8302:M 14 Mar 08:57:32.027 * 10 changes in 300 seconds. Saving...
8302:M 14 Mar 08:57:32.027 # Can't save in background: fork: Cannot allocate memory
8302:M 14 Mar 08:57:38.036 * 10 changes in 300 seconds. Saving...
8302:M 14 Mar 08:57:38.066 * Background saving started by pid 20629
20629:C 14 Mar 08:57:49.547 * DB saved on disk
20629:C 14 Mar 08:57:49.570 * RDB: 1 MB of memory used by copy-on-write
8302:M 14 Mar 08:57:49.666 * Background saving terminated with success
8302:M 14 Mar 09:02:50.013 * 10 changes in 300 seconds. Saving...
8302:M 14 Mar 09:02:50.044 * Background saving started by pid 21545
21545:C 14 Mar 09:03:01.194 * DB saved on disk
21545:C 14 Mar 09:03:01.229 * RDB: 1 MB of memory used by copy-on-write
8302:M 14 Mar 09:03:02.210 * Background saving terminated with success
8302:M 14 Mar 09:08:03.063 * 10 changes in 300 seconds. Saving...
8302:M 14 Mar 09:08:03.063 # Can't save in background: fork: Cannot allocate memory
8302:M 14 Mar 09:08:09.077 * 10 changes in 300 seconds. Saving...
8302:M 14 Mar 09:08:09.077 # Can't save in background: fork: Cannot allocate memory
8302:M 14 Mar 09:08:15.092 * 10 changes in 300 seconds. Saving...
8302:M 14 Mar 09:08:15.092 # Can't save in background: fork: Cannot allocate memory

Can't save in background: fork: Cannot allocate memory（翻译过来就是无法分配更多的内存）

排查方向：

1.设置redis可用内存过低，需要往高去设置

2.服务器内存过低，排查其他占用内存高的进程，讨论出方案后实施迁移到其他服务器或者服务器升配

3.redis是否频繁添加数据，如果是这个问题，需要优化代码或修改redis密码（我这边是这个问题）