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I've installed Debian Wheezy and after installation completed, I realized that I forgot to set the swap memory. So now, how can I configure the swap space?

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2 Answers 2

up vote 7 down vote accepted

Try this:

  1. Create a partition or RAID array or logical volume... (or use an existing one) for swap
  2. mkswap that partition
  3. Run blkid that-block-device
  4. Add an entry to /etc/fstab in the form UUID=7321174b-e4d8-4d9d-b223-113a1b8e9c9f swap swap sw 0 0 (see step 3 for actual UUID)
  5. swapon -a or reboot
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You can also use a file instead of a partition. It's slower, but will get the job done if you don't have room for an additional partition. – jordanm Sep 17 '12 at 22:50

FYI. If you configure a swap space on an encrypted container, it will break! I strongly advise you to configure swap volume during the OS setup phase.

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Edit: if you try to configure swap space on logical volume where the encrypted container resides outside of the logical volume, it will break. – Neocron Jul 22 at 23:58
I am using swapfiles on encrypted volumes for years without setting them up in setup phase and never ran into problems. – Jodka Lemon Jul 23 at 0:04
..running Debian. – Jodka Lemon Jul 23 at 0:13

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