[CentOS] Apparently no swap configured

nate centos at linuxpowered.net
Tue Oct 28 04:46:01 UTC 2008

Ian Masters wrote:
> Hello,
> I'm in a slightly unusual situation and I'd really appreciate some advice.
> I installed CentOS 5.2 on a server about a month ago.
> Today I happened to check the 'free' command and noticed that the Swap
> line reads as follows:
> Swap:            0          0          0
> I'm pretty certain that when I installed the OS and created a custom
> partition table, that I defined a swap partition, but there is no swap
> line in
> /etc/fstab either.
> However the output of 'lvm> lvdisplay' contains the following information
> (amongst others):
>   --- Logical volume ---
>   LV Name                /dev/VolGroup00/swap

If that volume is not in use by anything else you should
be perfectly able to do:

mkswap /dev/VolGroup00/swap
swapon /dev/VolGroup00/swap

then add something like this to fstab:
/dev/VolGroup00         swap                    swap    defaults        0 0


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