Little helper to run CNCF's k3s in Docker
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k3d/docs/faq/v1vsv3-comparison.md

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# Feature Comparison: v1 vs. v3
## v1.x feature -> implementation in v3
```text
- k3d
- check-tools -> won't do
- shell -> planned: `k3d shell CLUSTER`
- --name -> planned: drop (now as arg)
- --command -> planned: keep
- --shell -> planned: keep (or second arg)
- auto, bash, zsh
- create -> `k3d cluster create CLUSTERNAME`
- --name -> dropped, implemented via arg
- --volume -> implemented
- --port -> implemented
- --port-auto-offset -> TBD
- --api-port -> implemented
- --wait -> implemented
- --image -> implemented
- --server-arg -> implemented as `--k3s-server-arg`
- --agent-arg -> implemented as `--k3s-agent-arg`
- --env -> planned
- --label -> planned
- --workers -> implemented
- --auto-restart -> dropped (docker's `unless-stopped` is set by default)
- --enable-registry -> coming in v4.0.0 (2021) as `--registry-create` and `--registry-use`
- --registry-name -> TBD
- --registry-port -> TBD
- --registry-volume -> TBD
- --registries-file -> TBD
- --enable-registry-cache -> TBD
- (add-node) -> `k3d node create NODENAME`
- --role -> implemented
- --name -> dropped, implemented as arg
- --count -> implemented as `--replicas`
- --image -> implemented
- --arg -> planned
- --env -> planned
- --volume -> planned
- --k3s -> TBD
- --k3s-secret -> TBD
- --k3s-token -> TBD
- delete -> `k3d cluster delete CLUSTERNAME`
- --name -> dropped, implemented as arg
- --all -> implemented
- --prune -> TBD
- --keep-registry-volume -> TBD
- stop -> `k3d cluster stop CLUSTERNAME`
- --name -> dropped, implemented as arg
- --all -> implemented
- start -> `k3d cluster start CLUSTERNAME`
- --name -> dropped, implemented as arg
- --all -> implemented
- list -> dropped, implemented as `k3d get clusters`
- get-kubeconfig -> `k3d kubeconfig get|merge CLUSTERNAME`
- --name -> dropped, implemented as arg
- --all -> implemented
- --overwrite -> implemented
- import-images -> `k3d image import [--cluster CLUSTERNAME] [--keep] IMAGES`
- --name -> implemented as `--cluster`
- --no-remove -> implemented as `--keep-tarball`
```