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Accepted
Daniel C. Sobral
Asked: 2010-09-24 05:15:58 +0800 CST

How do I add swap automatically when creating instances on Ganeti 2?

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I'm using the ganeti2 package on Debian 5. Instance creation goes pretty smoothly, except that it doesn't configure a swap disk automatically, and I'd like it to do so.

Googling around, I found absolutely no one with my problem, which makes me suspect a fundamental mistake on my part, but I can't figure out what. The Ganeti 2 documentation also doesn't touch the subject, though previous versions had an instance creation parameter for that.

So, how can I do it? Or what am I doing wrong?

virtualization debian

2 Answers

  1. You are likely explicitly telling it to just create one disk, as the --swap-size option is now deprecated. You should be able to add a swap partition like so: 

    --disks 0:size=200G --disks 1:size=2G ...[more config]

    on instance creation. Make the usual adjustments after the instance is created -- mkswap, swapon, /etc/fstab etc. Alternatively, you can create a swap file on the instance itself from within the filesystem and keep your creation more or less the same:

    dd if=/dev/zero of=/swap_file bs=1M count=2048
mkswap /swap_file
swapon /swap_file
echo '/swap_file swap swap defaults 0 0' >> /etc/fstab
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  2. Best Answer

    I realize this question is three years old - but in case anyone else comes across it with the same issue, it looks like Pietro Abate has a ganeti-instance-debootstrap hook for doing this, which is pretty automatic:

    http://mancoosi.org/~abate/add-swap-hook-ganetideboostrapinstance

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