A script to check if the Docker daemon is up. If not, reboot after three failed docker ps commands.

docker-up-or-reboot.sh

#!/bin/bash

SLEEP_SECONDS=600

while true; do
  for i in `seq 1 3`; do
    timeout 5 docker ps -q && break || echo "Docker daemon is not running. Rebooting"

    if [[ $i -eq 3 ]]; then
      reboot
    fi
  done

  echo "Docker is up. Sleeping ${SLEEP_SECONDS} seconds"
  sleep ${SLEEP_SECONDS}
done