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Mac: FAQ: Disk usage in raw format (#5504) 

* Mac: FAQ: Disk usage in raw format

This is a new feature of Docker for Mac.  Questions and PRs have
already been made about this, and we expect more of them.

Signed-off-by: Akim Demaille <akim.demaille@gmail.com>
This commit is contained in:
Akim Demaille 2017-12-16 01:14:02 +01:00 committed by Misty Stanley-Jones
parent e2ea9531a6
commit e6a23925ef
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@ -184,11 +184,50 @@ For full information on adding server and client side certs, see [Adding
TLS certificates](/docker-for-mac/index.md#adding-tls-certificates) in
the Getting Started topic.
### How do I reduce the size of Docker.qcow2?
### Disk Usage
#### Qcow2 or Raw?
By default Docker for Mac stores containers and images in a file
`~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux/Docker.qcow2`.
This file grows on-demand up to a default maximum file size of 64GiB.
`Docker.raw` or `Docker.qcow2` in the directory
`~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux`.
Starting with High Sierra with APFS (Apple Filesystem) enabled, Docker
uses the "raw" format (`Docker.raw`), otherwise it uses the Qcow2
format (`Docker.qcow2`).
#### Docker.raw consumes an insane amount of disk space!
This is an illusion. Docker uses the raw format on Macs running the
Apple Filesystem (APFS). APFS supports _sparse files_, which compress
long runs of zeroes representing unused space. The output of `ls` is
misleading, because it lists the logical size of the file rather than
its physical size. To see the physical size, add the `-ks` switch; to
see the logical size in human readable form, add `-lh`:
```bash
$ cd ~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux
$ ls -klsh Docker.raw
2333548 -rw-r--r--@ 1 akim staff 64G Dec 13 17:42 Docker.raw
```
In this listing, the logical size is 64GB, but the logical size is
only 2.3GB.
Alternatively, you may use `du` (disk usage):
```bash
$ du -h Docker.raw
2,2G Docker.raw
```
#### How do I reduce the size of Docker.qcow2?
By default Docker for Mac stores containers and images in a file saved
in the directory
`~/Library/Containers/com.docker.docker/Data/com.docker.driver.amd64-linux`.
If your Docker for Mac uses the Qcow format, this file is
`Docker.qcow2`. This file grows on-demand up to a default maximum
file size of 64GiB.
In Docker 1.12 the only way to free space on the host is to delete
this file and restart the app. Unfortunately this removes all images
@ -209,7 +248,7 @@ In 1.13 a background `cron` job runs `fstrim` every 15 minutes.
If the space needs to be reclaimed sooner, run this command:
```bash
docker run --rm -it --privileged --pid=host walkerlee/nsenter -t 1 -m -u -i -n fstrim /var
$ docker run --rm -it --privileged --pid=host walkerlee/nsenter -t 1 -m -u -i -n fstrim /var
```
Once the `fstrim` has completed, restart the app. When the app shuts down, it