from my linux machine swap is - 0 why , and how to increase the swap?
[root@my_small_linux free total used free shared buffers cached Mem: 8172212 2087904 6084308 0 270020 1376776 -/+ buffers/cache: 441108 7731104 Swap: 0 0 0 
- Why? As it stands this system is a long way from needing any swap.symcbean– symcbean2011-03-08 11:27:34 +00:00Commented Mar 8, 2011 at 11:27
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2 Answers
That means, that no swap partition is available. If you have some unused space on hard drive, you can make it a swap partition (via fdisk). Or you can make swap on file. This creates 2GB swap:
dd if=/dev/zero of=/swap bs=1048576 count=2048 mkswap /swap swapon /swap And add it to /etc/fstab to be mounted at boot.
- I not get anything by swapon -s ?klod– klod2011-03-08 11:18:45 +00:00Commented Mar 8, 2011 at 11:18
- Okay, you did all 3 commands and
swapon -ssays nothing? Please send result ofls -lh /swap. That will show how the swap file is created. By the way, you have to do this under root or viasudo.mkudlacek– mkudlacek2011-03-08 11:24:25 +00:00Commented Mar 8, 2011 at 11:24 - @Mkudlacek how to build disk partition for swap?klod– klod2011-03-08 11:26:05 +00:00Commented Mar 8, 2011 at 11:26
- As MrShunz showed - via fdisk create partition with id "swap". You can use free space or old unused partition. Then execute mkswap on /dev/sd.. and prepare this partition to be a swap. Turn on the swap via swapon /dev/sd.. and add it /etc/fstab as MrShunz showed.mkudlacek– mkudlacek2011-03-08 11:31:49 +00:00Commented Mar 8, 2011 at 11:31
- how to uninstall the swap procedure according to your exampleklod– klod2011-03-08 11:43:28 +00:00Commented Mar 8, 2011 at 11:43
Could also be that in your /etc/fstab the swap partition is listed by uuid instead of /dev/sd*. If for some reason the uuid changed, it cannot be automatically mounted.
Check with fdisk -l as root/with sudo if it lists some swap partions. My output is:
[snip] Device Boot Start End Blocks Id System /dev/sdb1 * 1 34 273073+ 83 Linux /dev/sdb2 35 1340 10490445 83 Linux /dev/sdb3 1341 1449 875542+ 82 Linux swap / Solaris <<--- here it is! /dev/sdb4 1450 9729 66509100 83 Linux and then check the symbolik link to UUID with: ls -l /dev/disk/by-uuid/. Im my case:
0 lrwxrwxrwx 1 root root 10 2011-03-08 08:39 3565be89-f1fe-478c-9653-a1dbeb9406a9 -> ../../sdb3 So in /etc/fstab I have:
UUID=3565be89-f1fe-478c-9653-a1dbeb9406a9 none swap sw 0 0 Disclaimer: i'm under Ubuntu now, so actual paths might be different under other distros.
answered Mar 8, 2011 at 11:27
