Feat: docker-kind-support

[rauerhans]

Summary

This adds support to run docker containers and/or a kind cluster from within a plural cloud-cli kubectl exec session. The dind container needed for that is running in a rootfull, but unprviliged sidecar to the plural cloud-cli container on a sysbox node:

apiVersion: v1 
kind: Pod 
metadata: 
  name: plural-cli-dind-sidecar
  namespace: sysbox
  annotations:
    io.kubernetes.cri-o.userns-mode: "auto:size=65536"
spec: 
  runtimeClassName: sysbox-runc
  tolerations:
    - key: plural.sh/sysbox
      operator: Exists
    - key: plural.sh/capacityType
      operator: Exists
  restartPolicy: Never
  containers: 
    - name: plural-cli
      image: ghcr.io/pluralsh/plural-cli-cloud:pr-428
      command: ["sh", "-c", "while true; do sleep 3600; done"]
      resources: 
        requests: 
          cpu: 10m 
          memory: 256Mi 
      env: 
      - name: DOCKER_HOST 
        value: tcp://localhost:2375 
      volumeMounts: 
        - name: docker
          mountPath: /var/lib/docker 
    - name: sysbox-dind
      image: ghcr.io/pluralsh/plural-dind:pr-428
      resources: 
        requests: 
          cpu: 20m 
          memory: 512Mi 
      securityContext: 
        privileged: false 
      volumeMounts: 
        - name: docker
          mountPath: /var/lib/docker 
  volumes: 
    - name: docker 
      emptyDir: {}

!Make sure to only run this on the sysbox nodes!

Test:

plural@plural-cli-dind-sidecar:~$ whoami
plural
plural@plural-cli-dind-sidecar:~$ kind create cluster
Creating cluster "kind" ...
 ✓ Ensuring node image (kindest/node:v1.27.3) 🖼
 ✓ Preparing nodes 📦  
 ✓ Writing configuration 📜 
 ✓ Starting control-plane 🕹️ 
 ✓ Installing CNI 🔌 
 ✓ Installing StorageClass 💾 
Set kubectl context to "kind-kind"
You can now use your cluster with:

kubectl cluster-info --context kind-kind

Have a nice day! 👋
plural@plural-cli-dind-sidecar:~$ kubectl get nodes
NAME                 STATUS   ROLES           AGE   VERSION
kind-control-plane   Ready    control-plane   72s   v1.27.3
plural@plural-cli-dind-sidecar:~$ kubectl get pods --all-namespaces
NAMESPACE            NAME                                         READY   STATUS    RESTARTS   AGE
kube-system          coredns-5d78c9869d-2nqh6                     1/1     Running   0          80s
kube-system          coredns-5d78c9869d-vjfdb                     1/1     Running   0          79s
kube-system          etcd-kind-control-plane                      1/1     Running   0          89s
kube-system          kindnet-gdgs8                                1/1     Running   0          80s
kube-system          kube-apiserver-kind-control-plane            1/1     Running   0          90s
kube-system          kube-controller-manager-kind-control-plane   1/1     Running   0          89s
kube-system          kube-proxy-qk4mr                             1/1     Running   0          80s
kube-system          kube-scheduler-kind-control-plane            1/1     Running   0          93s
local-path-storage   local-path-provisioner-6bc4bddd6b-bmkf6      1/1     Running   0          80s
plural@plural-cli-dind-sidecar:~$ kind delete cluster
Deleting cluster "kind" ...
Deleted nodes: ["kind-control-plane"]

Labels

Test Plan

Checklist

• [ ] If required, I have updated the Plural documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] I have added a meaningful title and summary to convey the impact of this PR to a user.
• [ ] I have added relevant labels to this PR to help with categorization for release notes.

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