Manage Swap Devices using Ginger

[harche]

Using the Ginger we would like to list/add/remove the swap devices used by the host. Here is the example of swap devices attached to the host

cat /proc/swaps

Filename    Type    Size    Used    Priority
/dev/dm-2 partition 7864316 679660  -1

Here is the proposal for Ginger to do swap management on the host -

Collection: Swap devices

URI: /plugins/ginger/swaps

Methods:

GET: Retrieve a summarized list of all swap devices
POST: Create a swap device

• type : Type could be either device or file. Linux allows you to use either the block device or a regular file as a swap device. We would like to have support for both types.
• size : Only applicable if the swap device type is file. We need to know the size of the regular file that needs to be created which will act as a swap device.
• file_loc : Absolute path of the device.

Resource: Swap Device

URI: /plugins/ginger/swaps/:device_name

Methods:

GET: Retrieve the full description of a Swap Device

• filename: File name of the Swap Device
• type: The type of the Swap Device. partition for the block device and file for the regular file.
• size: Size of the Swap Device
• used: Amount of Swap Device space used
• priority : Priority of the Swap Device

DELETE: Remove the Swap Device

[pvital]

@harche interesting feature, but please, send a RFC (Request For Comments) to ginger mailing list ginger-dev-list@nongnu.org (CC also the old ML ginger-dev@yahoogroups.com due to delivery issues on nongnu lists). There you will get more feedback than here.

[danielhb]

Is it possible to update an existing swap device?

And what tools are you planning to use to implement this feature?

On 10/01/2015 07:13 AM, harche wrote:

Using the |Ginger| we would like to list/add/remove the swap devices
used by the host. Here is the example of swap devices attached to the host

cat /proc/swaps

|Filename Type Size Used Priority
/dev/dm-2 partition 7864316 679660 -1
|

Here is the proposal for |Ginger| to do swap management on the host -

*Collection: Swap devices*

URI: /plugins/ginger/swaps

Methods:

GET: Retrieve a summarized list of all swap devices
POST: Create a swap device

• /type/ : Type could be either |device| or |file|. Linux allows you
  to use either the |block device| or a |regular file| as a swap
  device. We would like to have support for both types.

• /size/ : Only applicable if the swap device type is |file|. We
  need to know the size of the regular file that needs to be created
  which will act as a swap device.

• /device_path/ : Absolute path of the device.

  Resource: Swap Device

URI: /plugins/ginger/swaps//:device_name/

Methods:

GET: Retrieve the full description of a Swap Device

• /filename/: File name of the Swap Device
• /type/: The type of the Swap Device. |partition| for the block
  device and |file| for the regular file.
• /size/: Size of the Swap Device
• /used/: Amount of Swap Device space used
• /priority/ : Priority of the Swap Device

DELETE: Remove the Swap Device

—
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#23.

[harche]

@danielhb

• For the first release of this feature, we want to support only creation, listing and deletion of the swap space. Later releases will focus on changes the attributes of the swap device like priority, size etc.
• We have modelled swap devices like most of the other resources in kimchi. Which is specified in the issue description above. For actually interacting with system, we are executing commands on it and analyse the return values and status.

[danielhb]

It is ok to start it 'small' with the first release in my opinion.

I suggest to forward the first post of this issue to ginger-dev-list@googlegroups.com to get comments from the rest of the community.

Thanks

[danielhb]

This feature is implemented at current master branch.

Thanks!