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博客使用的是阿里云的服务器，最低配置的那种（只有512M内存）。在安装最新版本的Mariadb的时候，总是因为内存不足安装失败。所以决定开启swap。

由于开启swap会降低磁盘IO性能，所以用过之后可以去掉。

1、创建交换分区文件

dd if=/dev/zero of=/home/swap bs=1M count=512

bs：block的大小,

count：block的数量，可以自定义。

/home/swap：技安自定义的swap文件位置

技安这里定义的是512M的swap

2、设置swap文件

mkswap /home/swap

3、立即启用swap

swapon /home/swap

如果在/etc/rc.local中有swapoff -a 需要修改成swapon

4、根据需要可以设置是否开机启动

echo '/home/swap swap swap defaults 0 0'>> /etc/fstab

5、查看swap

free -m