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linked to related GitHub issue, slight re-ordering of topics 

Signed-off-by: Victoria Bialas <victoria.bialas@docker.com>
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Victoria Bialas 2017-01-12 18:33:14 -08:00
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docker-for-mac/faqs.md
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@ -136,18 +136,15 @@ For a complete explanation of how to do this, see the blog post [Adding Self-sig
to Docker & Docker for
Mac](http://container-solutions.com/adding-self-signed-registry-certs-docker-mac/).
### What are system requirements for Docker for Mac?
Note that you need a Mac that supports hardware virtualization, which is most non ancient ones; i.e., use macOS `10.10.3+` or `10.11` (macOS Yosemite or macOS El Capitan). See also "What to know before you install" in [Getting Started](index.md).
### How do I reduce the size of Docker.qcow2?
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.
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 and containers.
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
and containers.
In Docker 1.13 there is preliminary support for "TRIM" to non-destructively
free space on the host. First free space within the `Docker.qcow2` by
@ -159,18 +156,26 @@ removing unneeded containers and images using
volumes not used by at least one container and all images without at least one
referring container.
Note the `Docker.qcow2` will not shrink in size immediately. In 1.13 a background
`cron` job runs `fstrim` every 15 minutes. If the space needs to be reclaimed
sooner, run this command:
Note the `Docker.qcow2` will not shrink in size immediately.
In 1.13 a background `cron` job runs `fstrim` every 15 minutes.
If the space needs to be reclaimed sooner, run this command:
```
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 will compact the file and the space will be freed. Note the app
will take longer to restart than usual because it must wait for the compaction
to complete.
Once the `fstrim` has completed, restart the app. When the app shuts down it
will compact the file and the space will be freed. Note the app will
take longer to restart than usual because it must wait for the
compaction to complete.
For background conversation thread on this, see [Docker.qcow2 never shrinks
..](https://github.com/docker/for-mac/issues/371) on Docker for Mac GitHub
issues.
### What are system requirements for Docker for Mac?
Note that you need a Mac that supports hardware virtualization, which is most non ancient ones; i.e., use macOS `10.10.3+` or `10.11` (macOS Yosemite or macOS El Capitan). See also "What to know before you install" in [Getting Started](index.md).
### Do I need to uninstall Docker Toolbox to use Docker for Mac?