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docs: add faq tips for buildkit cache folder clean-ups #3741

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Dec 11, 2024
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docs: add faq tips for buildkit cache folder clean-ups #3741

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13 changes: 13 additions & 0 deletions docs/faq.md
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@
- [Containers do not automatically start after rebooting the host](#containers-do-not-automatically-start-after-rebooting-the-host)
- [Error `failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: unable to apply cgroup configuration: unable to start unit ... {Name:Slice Value:"user.slice"} {Name:Delegate Value:true} ... Permission denied: unknown`](#error-failed-to-create-shim-task-oci-runtime-create-failed-runc-create-failed-unable-to-start-container-process-unable-to-apply-cgroup-configuration-unable-to-start-unit--nameslice-valueuserslice-namedelegate-valuetrue--permission-denied-unknown)
- [How to uninstall ? / Can't remove `~/.local/share/containerd`](#how-to-uninstall---cant-remove-localsharecontainerd)
- [How to clean a dangling cache of buildkit?](#how-to-clean-a-dangling-cache-of-buildkit)

<!-- END doctoc generated TOC please keep comment here to allow auto update -->

Expand Down Expand Up @@ -355,3 +356,15 @@ Run the following commands:
containerd-rootless-setuptool.sh uninstall
rootlesskit rm -rf ~/.local/share/containerd ~/.local/share/nerdctl ~/.config/containerd
```

### How to clean a dangling cache of buildkit?

`buildkit` cache directory is located at `$HOME/.local/share/buildkit/`
in rootless mode, which has same folder structure `/var/lib/buildkit/` in
root mode.

You can clear the cache objects by running the following command:
```
nerdctl builder prune
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Out of curiosity; why is nerdctl system prune --all? not enough

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It is significant effective without --all. It is not clear what --all includes.

```
The command produce a progress message of id and size of removed objects.