29581:M 07 Sep 11:01:20.505 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.

29581:M 07 Sep 11:01:20.505 # Server started, Redis version 3.2.0

29581:M 07 Sep 11:01:20.505 # 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.

29581:M 07 Sep 11:01:20.505 # 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.

WARNING: The TCP backlog setting of 511.解决

原因就是因为128太小了。执行echo 511 > /proc/sys/net/core/somaxconn

命令就把这个问题解决了。但是这个只是暂时的。

如果想要永久解决，打开ietc/sysctl.conf，在这里面添net.core.somaxconn= 1024 然后执行sysctl -p 就可以永久消除这个warning

WARNING overcommit_memory is set to 0..解决

执行

echo 1 > /proc/sys/vm/overcommit_memory

WARNING you have Transparen Huge Pages..解决

执行

echo never > /sys/kernel/mm/transparent_hugepage/enabled

永久处理：

vi /etc/rc.local添加

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