1、用文件系统创建swapfile
[root@yuxuan logs]# dd if=/dev/zero of=swapfile bs=1M count=8096
8096+0 records in
8096+0 records out
8489271296 bytes (8.5 GB) copied, 64.9221 s, 131 MB/s
2、创建swap
[root@yuxuan logs]# mkswap swapfile
Setting up swapspace version 1, size = 8290300 KiB
no label, UUID=b166e2a3-37b4-4acf-8d92-bc528dad7b5
[root@yuxuan logs]# swapon swapfile
swapon: /home/coremail/logs/swapfile: insecure permissions 0644, 0600 suggested.
3、设置开机启动
vim /etc/fstab
/swap/swapfile swap swapdefaults 0 0