Redis启动时的警告及对应的系统配置调整

1. Increased maximum number of open files to 10032 (it was originally set to 1024).

vim /etc/security/limits.conf
* soft nofile 10032
* hard nofile 10032

ulimit -n 10032

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

vim /etc/sysctl.conf
net.core.somaxconn = 2048

sysctl -p

3. 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.

vim /etc/sysctl.conf
vm.overcommit_memory = 1

sysctl vm.overcommit_memory=1

4. 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.

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

vim /etc/rc.local
if test -f /sys/kernel/mm/transparent_hugepage/enabled; then
  echo never > /sys/kernel/mm/transparent_hugepage/enabled
fi