[Bug 1374166] Re: Document how to add swap space on Azure resource disk

[trialotto]

Daniel,

Defining swap with cloud-config will not result in a persistent swap
space across shutdown and restart sequences on Azure.

In general, the cloud-config disk setup and/or filesystem stanza will
not result in a persisting ext4 ephemeral disk in before mentioned
sequences, in which the ephemeral disk often (but strangely, not always)
returns to ntfs format.

The above suggests (on the one hand) an impossibility to use ephemeral
disk space for swap purposes and (on the other hand) a bug in the Azure
fabric, causing defined swap spaces to be lost when returning to the
ntfs format.

Naturally, an added (non-ephemeral) disk can be used for swap purposes,
but this is not adviceable.

Furthermore, configuring the waagent.conf variables
"ResourceDisk.Format=y" would resolve the Azure fabric issue.

In conclusion, cloud-init and the Azure fabric are not really
interacting properly, with respect to swap spaces.

Any advances on the cloud-init front?

Kind regards...

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Title:
  Document how to add swap space on Azure resource disk

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