[root@domain /root]# free -m
total used free shared buffers cached
Mem: 251 242 8 22 11 32
-/+ buffers/cache: 198 52
Swap: 133 133 0
Make sure we have 128 MB laying around somewhere:
[root@domain /root]# df
Filesystem 1k-blocks Used Available Use% Mounted on
/dev/hda9 132207 33429 91952 27% /
/dev/hda1 15522 2537 12184 17% /boot
/dev/hda6 6143236 739000 5092176 13% /opt
/dev/hda7 1035660 836204 146848 85% /usr
/dev/hda5 2071384 344048 1622112 17% /usr/local
/dev/hda8 303344 14439 273244 5% /var
OK, we're going to make a swap file in /opt by using dd to create a file 128 MB in size.
[root@domain /opt]# dd if=/dev/zero of=swapfile bs=1024 count=132207
132207+0 records in
132207+0 records out
[root@domain /opt]# ls -l
total 132364
drwxr-xr-x 20 usr-3 users 4096 May 22 10:46 usr-3
drwxr-xr-x 2 root root 16384 Feb 21 07:04 lost+found
-rw-r--r-- 1 root root 135379968 May 29 11:52 swapfile
Let's not make it world-readable...
[root@domain /opt]# chmod 600 swapfile
[root@domain /opt]# ls -l
total 132364
drwxr-xr-x 20 usr-3 users 4096 May 22 10:46 usr-3
drwxr-xr-x 2 root root 16384 Feb 21 07:04 lost+found
-rw------- 1 root root 135379968 May 29 11:52 swapfile
Now we set up the swap area and enable it.
[root@domain /opt]# mkswap swapfile
Setting up swapspace version 1, size = 135372800 bytes
[root@domain /opt]# swapon swapfile
And voila! Twice as much swap as before.
[root@domain /opt]# free
total used free shared buffers cached
Mem: 257632 254632 3000 2512 36172 15096
-/+ buffers/cache: 203364 54268
Swap: 268708 136512 132196
You can append a line like this to /etc/fstab to enable your swap file automatically at boot time:
/opt/swapfile swap swap defaults 0 0
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