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Redis Docekr WARNING Memory overcommit must be enabled! Without it, a background...

 2 months ago
source link: https://www.cnblogs.com/tinywan/p/18048071
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Redis Docekr WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition

Docker 容器

ssr-redis    | 1:C 01 Mar 2024 22:00:46.869 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo
ssr-redis    | 1:C 01 Mar 2024 22:00:46.869 # Redis version=7.0.10, bits=64, commit=00000000, modified=0, pid=1, just started
ssr-redis    | 1:C 01 Mar 2024 22:00:46.869 # Warning: no config file specified, using the default config. In order to specify a config file use redis-server /path/to/redis.conf
ssr-redis    | 1:M 01 Mar 2024 22:00:46.869 * monotonic clock: POSIX clock_gettime
ssr-redis    | 1:M 01 Mar 2024 22:00:46.870 * Running mode=standalone, port=6379.
ssr-redis    | 1:M 01 Mar 2024 22:00:46.870 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
ssr-redis    | 1:M 01 Mar 2024 22:00:46.870 # Server initialized
ssr-redis    | 1:M 01 Mar 2024 22:00:46.870 # WARNING Memory overcommit must be enabled! Without it, a background save or replication may fail under low memory condition. Being disabled, it can can also cause failures without low memory condition, see https://github.com/jemalloc/jemalloc/issues/1328. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect.

您的 Redis 容器日志中的警告信息指出了内存超分配（overcommit）的设置问题。在 Linux 系统中，内存超分配是一种内核行为，允许进程分配超出物理内存大小的虚拟内存。对于 Redis，这是一个重要的设置，尤其是当执行如 RDB 快照或 AOF 日志重写等内存密集型操作时。

警告信息的含义

  • Redis 需要内存超分配（vm.overcommit_memory）被设置为 1。这意味着操作系统将始终允许分配所有请求的内存，这对于 Redis 的某些操作至关重要。
  • 如果没有正确设置，当 Redis 尝试创建快照或进行某些类型的复制时，可能会因为内存不足而失败。这可能导致数据丢失或其他问题。

您需要在宿主机（运行 Docker 的服务器）上设置 vm.overcommit_memory 参数。这通常涉及两个步骤：

临时更改

在宿主机上执行以下命令：

sudo sysctl vm.overcommit_memory=1

永久更改

编辑 /etc/sysctl.conf 文件（或在某些系统上，可能是 /etc/sysctl.d/ 目录下的文件）。添加或修改以下行：

vm.overcommit_memory = 1

保存文件并重新启动系统，或者运行 sudo sysctl -p 来立即应用更改。

再次重启，问题解决

1021265-20240301221007631-124086375.png

作者：Tinywan

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