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docker: remove legacy doc and add sysext removal snippet #370

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merged 2 commits into from
Nov 5, 2024
Merged

docker: remove legacy doc and add sysext removal snippet #370

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6ec943d
This is legacy and not true anymore
tormath1 Nov 5, 2024
c9336e8
sysext: mention Docker / Containerd removal
tormath1 Nov 5, 2024
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155 changes: 0 additions & 155 deletions ...ent/docs/latest/container-runtimes/use-a-custom-docker-or-containerd-version.md
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16 changes: 16 additions & 0 deletions content/docs/latest/provisioning/sysext/_index.md
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Expand Up @@ -57,6 +57,22 @@ The table below give an overview on the supported Flatcar extensions.
Users can enable Flatcar extensions by writing one name per line to `/etc/flatcar/enabled-sysext.conf`.
For now there are no pre-enabled release extensions but once Flatcar would move parts of the base image out into extensions, these would be pre-enabled as entries in `/usr/share/flatcar/enabled-sysext.conf`. They can be disabled with a `-NAME` entry in `/etc/flatcar/enabled-sysext.conf`.

### Remove Docker and / or Containerd from Flatcar

If Flatcar is used as a Kubernetes node or one wants to try a different version of Docker or Containerd, it is possible to remove those extensions from Flatcar at boot using this configuration:
```yaml
variant: flatcar
version: 1.0.0
storage:
links:
- path: /etc/extensions/docker-flatcar.raw
target: /dev/null
overwrite: true
- path: /etc/extensions/containerd-flatcar.raw
target: /dev/null
overwrite: true
```

## Community supported extensions ("community supported")

A simple way to extend Flatcar is to use the systemd-sysext images from the [sysext-bakery GitHub repo](https://github.com/flatcar/sysext-bakery). It [publishes prebuilt images](https://github.com/flatcar/sysext-bakery/releases) that bundle third-party binaries. The repo README provides a Butane config example for updating the extensions with `systemd-sysupdate`.
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