[Bug 1410824] Re: Swap space with mounts module not working

[Scott Moser]

Hi,
  what version of cloud-init are you using?
  This functionality is only availble in trunk since 2014-10-01.  It is only in Ubuntu vivid and utopic, not in trusty.

That said, I just launched an instance with this config:
#cloud-config
swap:
 size: auto
 filename: /swap.img
 maxsize: 8G

/var/log/cloud-init.log says:
Jan 15 15:33:18 vivid-20150115-153256 [CLOUDINIT] cc_mounts.py[DEBUG]: suggest 8182 MB swap for 7984 MB memory with '9092 MB' disk given max=8192 MB [max=8182 MB]'
Jan 15 15:33:32 vivid-20150115-153256 [CLOUDINIT] util.py[DEBUG]: creating swap file '/swap.img' of 8182MB took 14.301 seconds

$  ls -lh /swap.img ; du /swap.img 
-rw------- 1 root root 8.0G Jan 15 15:33 /swap.img
8378372	/swap.img

$ free
             total       used       free     shared    buffers     cached
Mem:       8176028    8009932     166096        308       9280    7680480
-/+ buffers/cache:     320172    7855856
Swap:      8378364          0    8378364

Launching another instance without the specified 'max' gives me:
Jan 15 15:44:41 vivid-20150115-154415 [CLOUDINIT] cc_mounts.py[DEBUG]: suggest 2273 MB swap for 7984 MB memory with '9092 MB' disk given max=None [max=2273 MB]'


The algorithm for 'auto' is agreeably nebulus, but I feel that any algoritm is going to seem odd/broken for some set.

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Title:
  Swap space with mounts module not working

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