Redis 启动警告解决

警告一：

WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

解决：

方法2: 永久生效: 修改/etc/sysctl.conf文件，增加一行
net.core.somaxconn= 1024
然后执行命令
sysctl -p

警告二：

WARNING 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.

解决：

方法2: 永久生效: 修改/etc/sysctl.conf文件，增加一行
vm.overcommit_memory = 1
然后执行命令
sysctl -p

警告三：

 WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue 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 the setting after a reboot. Redis must be restarted after THP is disabled.

解决：

永久解决
[root@centos224]# vi /etc/rc.local
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
   echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi
if test -f /sys/kernel/mm/transparent_hugepage/defrag; then
   echo never > /sys/kernel/mm/transparent_hugepage/defrag
fi

最后 reboot 就能起效了

参考文档 https://blog.csdn.net/jiangshouzhuang/article/details/50864933

https://www.cnblogs.com/kerrycode/archive/2015/07/23/4670931.html

Redis 启动警告解决

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