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Merge pull request #10204 from vbatts/vbatts-dm_info_docs 

devmapper: some explination of `docker info`
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Vincent Batts 2015-01-20 09:41:25 -05:00
parent 2feb2d07b6 a09a665d99
commit 06da161aee
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daemon/graphdriver/devmapper/README.md
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@ -28,6 +28,45 @@ containers. All base images are snapshots of this device and those
images are then in turn used as snapshots for other images and images are then in turn used as snapshots for other images and
eventually containers. eventually containers.
### Information on `docker info`
As of docker-1.4.1, `docker info` when using the `devicemapper` storage driver
will display something like:
$ sudo docker info
[...]
Storage Driver: devicemapper
Pool Name: docker-253:1-17538953-pool
Pool Blocksize: 65.54 kB
Data file: /dev/loop4
Metadata file: /dev/loop4
Data Space Used: 2.536 GB
Data Space Total: 107.4 GB
Metadata Space Used: 7.93 MB
Metadata Space Total: 2.147 GB
Udev Sync Supported: true
Data loop file: /home/docker/devicemapper/devicemapper/data
Metadata loop file: /home/docker/devicemapper/devicemapper/metadata
Library Version: 1.02.82-git (2013-10-04)
[...]
#### status items
Each item in the indented section under `Storage Driver: devicemapper` are
status information about the driver.
* `Pool Name` name of the devicemapper pool for this driver.
* `Pool Blocksize` tells the blocksize the thin pool was initialized with. This only changes on creation.
* `Data file` blockdevice file used for the devicemapper data
* `Metadata file` blockdevice file used for the devicemapper metadata
* `Data Space Used` tells how much of `Data file` is currently used
* `Data Space Total` tells max size the `Data file`
* `Metadata Space Used` tells how much of `Metadata file` is currently used
* `Metadata Space Total` tells max size the `Metadata file`
* `Udev Sync Supported` tells whether devicemapper is able to sync with Udev. Should be `true`.
* `Data loop file` file attached to `Data file`, if loopback device is used
* `Metadata loop file` file attached to `Metadata file`, if loopback device is used
* `Library Version` from the libdevmapper used
### options ### options
The devicemapper backend supports some options that you can specify The devicemapper backend supports some options that you can specify