## 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

echo "redis soft noproc 2048" >> /etc/security/limits.conf



echo "redis hard noproc 65536" >> /etc/security/limits.conf
```

## 4. 调低OOM优先级(可暂时不调)

```
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:

我们这里设成1024

```
echo 1024 > /proc/sys/net/core/somaxconn
```
重启后生效

```
echo "echo 1024 > /proc/sys/net/core/somaxconn" >>/etc/rc.local
```
## 6. NTP服务器设置