Linux 配置 Swap 功能

free -m
grep -i 'swaptotal' /proc/meminfo | awk '{print $2}'

## 从根目录划一块空间给 Swap
dd if=/dev/zero of=/swapfile bs=1G count=1
mkswap /swapfile
swapon /swapfile
echo "/swapfile swap swap defaults 0 0" >>/etc/fstab

sed -i '/swap/s/^/#/' /etc/fstab
swapoff -a

## 临时生效
sysctl -w vm.swappiness=10
sysctl -a | grep vm.swappiness
cat /proc/sys/vm/swappiness

## 永久生效
echo 'vm.swappiness = 10' >>/etc/sysctl.conf
sysctl -p