023-手動增長swap分區

先本身增長一塊磁盤

dd if=/dev/zero of=/tmp/newdisk bs=1M count =100

dd 操做磁盤從zero（盜零器）中產生0 到of 裏面去 ，產生塊大小1M 數量100 。

[root@Carlton ~]# mkswap -f /tmp/newdisk     格式化
Setting up swapspace version 1, size = 102396 KiB
no label, UUID=8fb9f68e-77da-4b86-b80e-7663edeb3c30
[root@Carlton ~]# free -m
             total       used       free     shared    buffers     cached
Mem:           996        919         76         11         35        336
-/+ buffers/cache:        547        449
Swap:            0          0          0
[root@Carlton ~]# swapon /tmp/newdisk 
[root@Carlton ~]# free -m
             total       used       free     shared    buffers     cached
Mem:           996        919         76         11         35        336
-/+ buffers/cache:        547        448
Swap:           99          0         99
[root@Carlton ~]# swapoff /tmp/newdisk 
[root@Carlton ~]# free -m
             total       used       free     shared    buffers     cached
Mem:           996        919         76         11         35        336
-/+ buffers/cache:        547        449
Swap:            0          0          0