Redis启动三个警告 必须注意！

32293:M 02 Dec 15:03:19.394 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

32293:M 02 Dec 15:03:19.394 # 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.

32293:M 02 Dec 15:03:19.394 # 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.

这是必须解决的 ：

解决方案都是持久性配置，不是临时配置。

第一个警告
vim /etc/sysctl.conf
net.core.somaxconn = 1024 # 增加此行 保存退出 
sysctl -p # 执行此行生效

第二个警告
vim /etc/sysctl.conf
vm.overcommit_memory = 1 # 增加此行 保存退出 
sysctl -p # 执行此行生效

第三个警告 (！！！请根据日志文件提示调整！！！)
将其写入/etc/rc.local文件中：
vim /etc/rc.local 
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
   echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi

source /etc/rc.local   //让配置生效