linux使用文件增加swap空间

[[email?protected] /]# dd if=/dev/zero of=swapfile bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied,5.32039 s,202 MB/s

2、mkswap创建交换文件

[[email?protected] /]# mkswap swapfile
Setting up swapspace version 1,size = 1048572 KiB
no label,UUID=5b0141c1-5bbc-4f44-8d31-80a9cf160b36

3、swapon激活

[[email?protected] /]# swapon swapfile
swapon: /swapfile: insecure permissions 0644,0600 suggested.

4、查看增加后swap空间

[[email?protected] /]# free -h
total used free shared buff/cache available
Mem: 991M 568M 68M 50M 354M 222M
Swap: 1.0G 0B 1.0G

5、开机启动

vim /etc/fstab 添加
/swap/swapfile swap swapdefaults 0 0

6、去掉增加swap
停止使用swap

swapoff swapfile

删除文件

rm swapfile -rf

确认

free -h