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docs: add Bottlerocket section to rootless Podman #17987

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docs: add Bottlerocket section to rootless Podman
krispage May 22, 2025
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39 changes: 39 additions & 0 deletions docs/admin/templates/extending-templates/docker-in-workspaces.md
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Expand Up @@ -266,6 +266,45 @@ Before using Podman, please review the following documentation:
> For more information around the requirements of rootless podman pods, see:
> [How to run Podman inside of Kubernetes](https://www.redhat.com/sysadmin/podman-inside-kubernetes)

### Rootless Podman on Bottlerocket nodes

Rootless containers rely on Linux user-namespaces.
[Bottlerocket](https://github.com/bottlerocket-os/bottlerocket) disables them by default (`user.max_user_namespaces = 0`), so Podman commands will return an error until you raise the limit:

```output
cannot clone: Invalid argument
user namespaces are not enabled in /proc/sys/user/max_user_namespaces
```

1. Add a `user.max_user_namespaces` value to your Bottlerocket user data to use rootless Podman on the node:

```toml
[settings.kernel.sysctl]
"user.max_user_namespaces" = "65536"
```

1. Reboot the node.
1. Verify that the value is more than `0`:

```shell
sysctl -n user.max_user_namespaces
```

For Karpenter-managed Bottlerocket nodes, add the `user.max_user_namespaces` setting in your `EC2NodeClass`:

```yaml
apiVersion: karpenter.k8s.aws/v1
kind: EC2NodeClass
metadata:
name: bottlerocket-rootless
spec:
amiFamily: Bottlerocket # required for BR-style userData
# …
userData: |
[settings.kernel]
sysctl = { "user.max_user_namespaces" = "65536" }
```

## Privileged sidecar container

A
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