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[0.11 backport] docs: troubleshoot for `mount proc:/proc (via /proc/self/fd/6), flags… #4092

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4 changes: 4 additions & 0 deletions docs/rootless.md
Original file line number Diff line number Diff line change
Expand Up @@ -115,6 +115,10 @@ Run `sysctl -w user.max_user_namespaces=N` (N=positive integer, like 63359) on t

See [`../examples/kubernetes/sysctl-userns.privileged.yaml`](../examples/kubernetes/sysctl-userns.privileged.yaml).

### Error `mount proc:/proc (via /proc/self/fd/6), flags: 0xe: operation not permitted`
This error is known to happen when BuildKit is executed in a container without the `--oci-worker-no-sandbox` flag.
Make sure that `--oci-worker-no-process-sandbox` is specified (See [below](#docker)).

## Containerized deployment

### Kubernetes
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