Techie:Techie Main/Linux/Increasing Swap Space

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Increasing swap partition size

Preferable if that's an option but not detailed here

Adding an extra swap file

There is a good article on linux.com about this.

It boils down to

  • Check existing swap space
    • /sbin/swapon -s
  • Decide where to put swap file (assume /extraswap for this example)
    • df -m
  • Backup important data just in case
  • Swap to root user
    • sudo su -
  • Create file initially full of zeros
    • dd if=/dev/zero of=/extraswap bs=1M count=512
  • Prepare file as a swap file
    • mkswap /extraswap
  • Turn on our swap file
    • swapon /extraswap
  • Check it's ok
    • /sbin/swapon -s
      • should include /extraswap in list
    • free
      • should show expected increase in swap space
  • add /extraswap to /etc/fstab so that it's still there when we reboot
    • cp /etc/fstab /etc/fstab.mybackup
    • add following line to /etc/fstab underneath existing swap entries
      • /extraswap none swap sw 0 0
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