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[dev][ubuntu]swap を拡張

root@ubuntu-vm:/etc# dd if=/dev/zero of=/swapfile bs=1024 count=524288
524288+0 records in
524288+0 records out
536870912 bytes (537 MB) copied, 3.68216 s, 146 MB/s
root@ubuntu-vm:/etc# mkswap /swapfile
Setting up swapspace version 1, size = 536866 kB
no label, UUID=bd4d2d4c-3a5d-4c56-b3b1-ff2d498ebc34
root@ubuntu-vm:/etc#  swapon /swapfile
root@ubuntu-vm:/etc# swapon -s
Filename				Type		Size	Used	Priority
/dev/sda5                               partition	915664	77824	-1
/swapfile                               file		524280	0	-2