redis 异常解决办法
26069:M 08 Aug 17:06:58.858 # WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128.
26069:M 08 Aug 17:06:58.859 # Server started, Redis version 3.0.7
26069:M 08 Aug 17:06:58.859 # 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.
26069:M 08 Aug 17:06:58.859 # 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.
26069:M 08 Aug 17:06:58.978 * DB loaded from disk: 0.119 seconds
分别执行如下语句：
echo 511 > /proc/sys/net/core/somaxconn
echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf
sysctl vm.overcommit_memory=1
echo never > /sys/kernel/mm/transparent_hugepage/enabled
在/etc/rc.local的最后添加echo never > /sys/kernel/mm/transparent_hugepage/enabled