redis-server的三个警告

本文针对Redis启动时出现的三个常见警告提供了持久性解决方案,包括调整TCP backlog设置、修正overcommit_memory参数以及禁用Transparent Huge Pages,确保Redis稳定运行。

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就这三个警告:

第一个警告:The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
第二个警告:overcommit_memory is set to 0! Background save may fail under low memory condition. 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.
第三个警告:you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix thisissue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain thesetting after a reboot. Redis must be restarted after THP is disabled.

解决方案
考虑到redis一般都是部署在服务器上作为服务存在的。所以,本文的解决方案都是持久性配置,不是临时配置。
第一个警告,第二个警告:
将net.core.somaxconn = 1024 和 vm.overcommit_memory = 1 添加到 /etc/sysctl.conf 中,然后执行sysctl -p生效配置。

[root@localhost ~]# vi /etc/sysctl.conf

如图,注意前面没有#号!
在这里插入图片描述
保存退出,再执行

[root@localhost ~]# sysctl -p

第三个警告
将echo never > /sys/kernel/mm/transparent_hugepage/enabled 添加到 /etc/rc.local 中,然后执行source /etc/rc.local 生效配置。

[root@localhost ~]# vi /etc/rc.local

注意前面没有#号
在这里插入图片描述
保存退出,再执行

[root@localhost ~]# source /etc/rc.local

好了,这时候再去执行 redis-server 就不会有警告提示了。

[root@serd3zdHDw1JO2j tools]# sudo systemctl status redisredis.service - redis-server Loaded: loaded (/usr/lib/systemd/system/redis.service; enabled; vendor preset: disabled) Drop-In: /etc/systemd/system/redis.service.d └─timeout.conf Active: activating (start) since Thu 2025-03-27 16:24:59 CST; 2s ago Control: 2233 (redis-server) Tasks: 5 Memory: 1.7M CGroup: /system.slice/redis.service └─2233 /tools/redis/bin/redis-server 127.0.0.1:6379 Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.184 * Running mode=standalone, port=6379. Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.184 # WARNING: The TCP backlog settin... 128. Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.184 # Server initialized Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.184 # WARNING overcommit_memory is se...fect. Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.185 * Loading RDB produced by version 7.0.2 Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.185 * RDB age 6 seconds Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.185 * RDB memory usage when created 0.82 Mb Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.185 * Done loading RDB, keys loaded: ...d: 0. Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.185 * DB loaded from disk: 0.000 seconds Mar 27 16:24:59 serd3zdHDw1JO2j redis-server[2233]: 2233:M 27 Mar 2025 16:24:59.185 * Ready to accept connections Hint: Some lines were ellipsized, use -l to show in full.
03-28
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