使用dd命令创建swap交换分区

[root@k-DevOps-10-13 ~]# dd if=/dev/zero of=/data/swapfile bs=1M count=30720
30720+0 records in
30720+0 records out
32212254720 bytes (32 GB) copied, 148.272 s, 217 MB/s

[root@k-DevOps-10-13 ~]# chmod 666 /data/swapfile

[root@k-DevOps-10-13 ~]# mkswap /data/swapfile
Setting up swapspace version 1, size = 31457276 KiB
no label, UUID=66809287-87a8-4e29-8c32-5e6f9ca0fd93

[root@k-DevOps-10-13 ~]# swapon /data/swapfile
swapon: /data/swapfile: insecure permissions 0666, 0600 suggested.

[root@k-DevOps-10-13 ~]# free -g
              total        used        free      shared  buff/cache   available
Mem:             30          14           0           0          16          16
Swap:            29           0          29

[root@k-DevOps-10-13 ~]# vim /etc/fstab 
/data/swapfile swap	swap	defaults	0 0
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