Redis Linux系统参数最佳配置

1. 设置sysctl参数

echo "vm.overcommit_memory=1" >> /etc/sysctl.conf

echo "vm.swappiness=1" >> /etc/sysctl.conf

/sbin/sysctl -p

2. 关闭透明大页

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

让其重启依然生效

echo "echo never > /sys/kernel/mm/transparent_hugepage/enabled" >>/etc/rc.local

chmod +x /etc/rc.local

3. 增加redis资源限制

echo "redis soft nofile 2048" >> /etc/security/limits.conf
echo "redis hard nofile 65536" >> /etc/security/limits.conf

4. 调低OOM优先级

echo {score} > /proc/{pid}/oom_adj

5. TCP Backlog

默认值是511，如果Linux的tcp-backlog小于Redis设置的tcp-backlog，那么在redis启动的时候会看到如下日志：

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

查看方法：

cat/proc/sys/net/core/somaxconn

修改它：

echo 511 > /proc/sys/net/core/somaxconn