Kubernetes Cleanup DaemonSet

cleanup-daemonsetup.yml

apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: cleanup
  labels:
    tier: system
    app: cleanup
    version: v3
spec:
  template:
    metadata:
      labels:
        name: cleanup
    spec:
      containers:
        - name: cleanup
          image: docker:1.11
          securityContext:
            privileged: true
          command: [
              '/bin/sh',
              '-c',
              '
                apk add --update bash && rm -rf /var/cache/apk/* &&
                echo "$$DOCKER_CLEANUP" > /docker-cleanup.sh &&
                chmod +x /docker-cleanup.sh &&
                /docker-cleanup.sh
              '
            ]
          env:
          - name: DOCKER_CLEANUP
            value: |
              #!/bin/bash

              # Source: https://github.com/paralin/KubeCleanup
              echo "Waiting ~30s for pods to be initially scheduled..."
              sleep 30s
              echo "Starting cleanup loop..."
              while true; do
                # WARNING: killing init containers causes pods to die, disabled for now.
                # echo "$(date +%s) Cleaning up exited containers..."
                # docker ps -a | grep Exit | cut -d ' ' -f 1 | xargs docker rm
                echo "$(date +%s) Cleaning up dangling images..."
                docker images --no-trunc -q -f dangling=true | xargs -r docker rmi
                echo "$(date +%s) Cleaning up unused images..."

                images=($(docker images | tail -n +2 | awk '{print $1":"$2}'))
                containers=($(docker ps -a | tail -n +2 | awk '{print $2}'))

                containers_reg=" ${containers[*]} "
                remove=()

                for item in ${images[@]}; do
                  if [[ ! $containers_reg =~ " $item " ]]; then
                    remove+=($item)
                  fi
                done

                remove_images=" ${remove[*]} "

                echo ${remove_images} | xargs -r docker rmi

                echo "$(date +%s) Done, waiting another 30 mins before next cleanup..."
                sleep 30m
              done
          volumeMounts:
            - name: docker
              mountPath: /var/run/docker.sock
      volumes:
        - name: docker
          hostPath:
            path: /var/run/docker.sock