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Merge pull request #1411 from jedevc/docker-container-volume-docs

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docs: add cache persistence notes for docker-container driver
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Justin Chadwell 2022-11-16 12:29:01 +00:00 committed by GitHub
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docs/manuals/drivers/docker-container.md
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@ -78,7 +78,42 @@ REPOSITORY TAG IMAGE ID CREATED
<image> latest adf3eec768a1 2 minutes ago 197MB
```
### QEMU
## Cache persistence
The `docker-container` driver supports cache persistence, as it stores all of
the BuildKit state and related cache into a dedicated docker volume.
To persist the `docker-container` driver's cache, even after recreating the
driver using `docker buildx rm` and `docker buildx create`, you can destroy the
builder using the `--keep-state` flag:
For example, to create a builder named `container` and then remove it while
persisting state:
```console
# setup a builder
$ docker buildx create --name=container --driver=docker-container --use --bootstrap
container
$ docker buildx ls
NAME/NODE DRIVER/ENDPOINT STATUS BUILDKIT PLATFORMS
container * docker-container
container0 desktop-linux running v0.10.5 linux/amd64
$ docker volume ls
DRIVER VOLUME NAME
local buildx_buildkit_container0_state
# remove the builder while persisting state
$ docker buildx rm --keep-state container
$ docker volume ls
DRIVER VOLUME NAME
local buildx_buildkit_container0_state
# the newly created driver with the same name will have all the state of the previous one!
$ docker buildx create --name=container --driver=docker-container --use --bootstrap
container
```
## QEMU
The `docker-container` driver supports using [QEMU](https://www.qemu.org/) (user
mode) to build non-native platforms. Use the `--platform` flag to specify which