Merge pull request #1967 from ktock/limadocs

Add docs about how to use stargz-snapshotter on Lima

Author: AkihiroSuda

docs/INSTALL.md

@@ -174,3 +174,7 @@ We assume that you are using CRI-O newer than https://github.com/cri-o/cri-o/pul
   systemctl restart containerd
   systemctl restart docker
   ```
+
+## Using stargz-snapshotter on Lima
+
+See [`./lima.md`](./lima.md)

docs/lima.md

@@ -0,0 +1,52 @@
+# Getting started with Stargz Snapshotter on Lima
+
+[Lima](https://github.com/lima-vm/lima) is a tool to manage Linux virtual machines on various hosts, including MacOS and Linux.
+Lima can be used as an easy way to get started with Stargz Snapshotter as Lima provides a default VM image bundling [containerd](https://github.com/containerd/containerd), [nerdctl](https://github.com/containerd/nerdctl)(Docker-compatible CLI of containerd) and Stargz Snapshotter.
+
+This document describes how to get started with Stargz Snapshotter on Lima.
+
+## Enable Stargz Snapshotter using `--snapshotter=stargz` flag
+
+nerdctl's `--snapshotter=stargz` flag enables stargz-snapshotter.
+
+```
+$ nerdctl.lima --snapshotter=stargz system info | grep stargz
+ Storage Driver: stargz
+```
+
+Using this flag, you can perform lazy pulling of a python eStargz image and run it.
+
+```
+$ nerdctl.lima --snapshotter=stargz run --rm -it --name python ghcr.io/stargz-containers/python:3.13-esgz
+Python 3.13.2 (main, Feb  6 2025, 22:37:13) [GCC 12.2.0] on linux
+Type "help", "copyright", "credits" or "license" for more information.
+>>>
+```
+
+## Use Stargz Snapshotter as the default snapshotter
+
+nerdctl recognizes an environment variable `CONTAINERD_SNAPSHOTTER` for the snapshotter to use.
+You can add this environment variable to the VM by configuring Lima config as shown in the following:
+
+```
+$ cat <<EOF >> ~/.lima/_config/override.yaml
+env:
+  CONTAINERD_SNAPSHOTTER: stargz
+EOF
+$ limactl stop
+$ limactl start
+$ nerdctl.lima system info | grep Storage
+Storage Driver: stargz
+```
+
+> NOTE: `override.yaml` applies to all the instances of Lima
+
+
+You can perform lazy pulling of eStargz using nerdctl, without any extra flags.
+
+```
+$ nerdctl.lima run --rm -it --name python ghcr.io/stargz-containers/python:3.13-esgz
+Python 3.13.2 (main, Feb  6 2025, 22:37:13) [GCC 12.2.0] on linux
+Type "help", "copyright", "credits" or "license" for more information.
+>>>
+```