CRICTL IMAGE CLEANUP on K8S

manifests.yaml

apiVersion: v1
kind: ConfigMap
metadata:
  name: imagecleanupconfig
  namespace: default
  labels:
    component: imagecleanup
data:
  # removes all images unused by a running container
  cronjobs: 0 0 * * * crictl rmi --prune 2>&1
---
apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: imagecleanup
  namespace: default
spec:
  selector:
    matchLabels:
      component: imagecleanup
  template:
    metadata:
      labels:
        component: imagecleanup
    spec:
      volumes:
        - name: containerd
          hostPath:
            path: /var/run/containerd/containerd.sock
            type: Socket
        - name: imagecleanupconfig
          configMap:
            name: imagecleanupconfig
      containers:
        - name: imagecleanup
          image: alpine:latest
          imagePullPolicy: Always
          env:
            - name: CRICTL_VERSION
              value: v1.20.0
            - name: CONTAINER_RUNTIME_ENDPOINT
              value: unix:///var/run/containerd/containerd.sock
            - name: IMAGE_SERVICE_ENDPOINT
              value: unix:///var/run/containerd/containerd.sock
          # details of the command:
          # - install crictl
          # - add a cron job from the config map
          # - execute crond in the foregroud
          command:
            [
              "sh",
              "-c",
              "wget https://github.com/kubernetes-sigs/cri-tools/releases/download/$CRICTL_VERSION/crictl-$CRICTL_VERSION-linux-amd64.tar.gz && tar zxvf crictl-$CRICTL_VERSION-linux-amd64.tar.gz -C /usr/local/bin && crontab /config/cronjobs && crond -f -d 8",
            ]
          resources:
            requests:
              cpu: 100m
              memory: 50Mi
          volumeMounts:
            - name: containerd
              mountPath: /var/run/containerd/containerd.sock
            - name: imagecleanupconfig
              mountPath: /config
---