Install CentOS7 swap with centminmod .08

for Centmin Mod initial setup, /tmp setup yes, swap no

you check via commands

check /tmp

Code:

df -hT

check swap

Code:

free -m

Code:

swapon -s

Code:

swapon -h

Usage:
swapon -a [-e] [-v] [-f]             enable all swaps from /etc/fstab
swapon [-p priority] [-v] [-f] <special>  enable given swap
swapon -s                            display swap usage summary
swapon -h                            display help
swapon -V                            display version

The <special> parameter:
{-L label | LABEL=label}             LABEL of device to be used
{-U uuid  | UUID=uuid}               UUID of device to be used
<device>                             name of device to be used
<file>                               name of file to be used

Code:

free -m
             total       used       free     shared    buffers     cached
Mem:           996        707        288         47         97        312
-/+ buffers/cache:        297        698
Swap:         1839          0       1839 

Code:

swapon -s
Filename                                Type            Size    Used    Priority
/dev/dm-1                               partition       1884156 0       -1

example on my KVM Linode with CentOS 7

Code:

df -hT
Filesystem     Type      Size  Used Avail Use% Mounted on
/dev/root      ext4       20G  9.5G  9.5G  50% /
devtmpfs       devtmpfs  495M     0  495M   0% /dev
tmpfs          tmpfs     496M     0  496M   0% /dev/shm
tmpfs          tmpfs     496M   52M  445M  11% /run
tmpfs          tmpfs     496M     0  496M   0% /sys/fs/cgroup
/dev/loop0     ext4      3.7G   16M  3.5G   1% /tmp

Linode configured swap within VPS console

Code:

free -m
              total        used        free      shared  buff/cache   available
Mem:            991         170         104          53         716         523
Swap:          2047         495        1552

 

Generally it is advisable to create swap if you don't have one setup. Some providers like Linode setup swap at VPS/disk partition creation time.

 

Yeah was thinking about auto setup for swap but so many VPS and dedicated configs out there and root / is not always the largest and best partition in terms of disk free space to place the swap file. My attempts at kvm swap file · GitHub a few months ago.. haven't tested it much yet