系統 - K3s - Hook createRuntime

參考資訊：
https://github.com/containerd/containerd/issues/6645
https://github.com/containerd/containerd/blob/main/docs/cri/config.md
https://github.com/opencontainers/runtime-spec/blob/main/config.md#prestart

步驟如下：

$ su
# ctr oci spec > /var/lib/rancher/k3s/agent/etc/containerd/myconfig.json
# vim /var/lib/rancher/k3s/agent/etc/containerd/myconfig.json
    "hooks": {
        "createRuntime": [
        {
            "path": "/home/user/run.sh",
            "args": [ "" ],
            "env": [],
            "timeout": 120
        }
        ]
    }

# cp /var/lib/rancher/k3s/agent/etc/containerd/config.toml /var/lib/rancher/k3s/agent/etc/containerd/config.toml.tmpl
# vim /var/lib/rancher/k3s/agent/etc/containerd/config.toml.tmpl
    [plugins."io.containerd.grpc.v1.cri".containerd.runtimes.runc]
      runtime_type = "io.containerd.runc.v2"
      base_runtime_spec = "/var/lib/rancher/k3s/agent/etc/containerd/myconfig.json"

# vim /home/user/run.sh
    #!/bin/bash
    echo 123 > /tmp/hook_createRuntime

# reboot
# crictl info | grep RuntimeSpec
    "baseRuntimeSpec": "/var/lib/rancher/k3s/agent/etc/containerd/myconfig.json",

# vim test.yaml
    apiVersion: apps/v1
    kind: Deployment
    metadata:
      name: nginx-deployment
    spec:
      selector:
        matchLabels:
          app: nginx
      replicas: 1
      template:
        metadata:
          labels:
            app: nginx
        spec:
          containers:
          - name: nginx
            image: nginx
            ports:
            - containerPort: 80

# kubectl create -f test.yaml 
    deployment.apps/nginx-deployment created

# cat /tmp/hook_createRuntime 
    123

# kubectl delete deployment nginx-deployment
    deployment.apps "nginx-deployment" deleted

# kubectl get pod
    No resources found in default namespace.