阿里云服务器设置swap交换分区

Posted 2021-09-16 杨雪之

root@Ubuntu ~
# cd /var/                                                                                                   [22:26:23]

root@Ubuntu /var
# dd if=/dev/zero of=/var/blockd.swap bs=1M count=4096                                                       [22:27:06]
4096+0 records in
4096+0 records out
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 35.9325 s, 120 MB/s

root@Ubuntu /var
# mkswap swapfile                                                                                            [22:31:03]
mkswap: cannot open swapfile: No such file or directory

root@Ubuntu /var
# /sbin/mkswap swapfile                                                                                      [22:31:55]
mkswap: cannot open swapfile: No such file or directory

root@Ubuntu /var
# mkswap blockd.swap                                                                                         [22:32:13]
mkswap: blockd.swap: insecure permissions 0644, 0600 suggested.
Setting up swapspace version 1, size = 4 GiB (4294963200 bytes)
no label, UUID=3ee0b5e8-a807-4c60-aa67-f2626889ff74

root@Ubuntu /var
# swapon /var/blockd.swap                                                                                    [22:32:35]
swapon: /var/blockd.swap: insecure permissions 0644, 0600 suggested.

root@Ubuntu /var
# /sbin/swapon -s                                                                                            [22:33:27]
Filename				Type		Size	Used	Priority
/var/blockd.swap                       	file    	4194300	0	-2

root@Ubuntu /var
# vim /etc/fstab                                                                                             [22:33:57]

root@Ubuntu /var
# vim /etc/sysctl.conf

root@Ubuntu ~
# swapon -s                                                                                                  [22:42:14]
Filename				Type		Size	Used	Priority
/var/blockd.swap                       	file    	4194300	0	-2

root@Ubuntu ~
# cat /proc/sys/vm/swappiness                                                                                [22:44:56]
60

root@Ubuntu ~
# df -hl                                                                                                     [22:45:08]
Filesystem      Size  Used Avail Use% Mounted on
udev            965M     0  965M   0% /dev
tmpfs           199M  660K  199M   1% /run
/dev/vda1        40G  9.4G   29G  25% /
tmpfs           994M     0  994M   0% /dev/shm
tmpfs           5.0M     0  5.0M   0% /run/lock
tmpfs           994M     0  994M   0% /sys/fs/cgroup
tmpfs           199M     0  199M   0% /run/user/0

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