A simple script that calls a docker command could be able to tell whether or not the docker daemon is running.

#!/bin/bash
#check docker command
if (! docker version ); then
  # Docker Daemon not running
  echo "not running"
  exit
fi
echo "running"

This is not very elegant, as it produces a connection error/ timeout error essentially waiting to connect to the daemon (which if it is not running, just times out) this also makes this check very slow

Client:
 Version:           19.03.1
 API version:       1.40
 Go version:        go1.12.7
 Git commit:        74b1e89e8a
 Built:             Wed Jul 31 15:18:18 2019
 OS/Arch:           windows/amd64
 Experimental:      false
error during connect: Get https://192.168.99.100:2376/v1.40/version: dial tcp 19
2.168.99.100:2376: connectex: A connection attempt failed because the connected
party did not properly respond after a period of time, or established connection
 failed because connected host has failed to respond.
not running

If docker is running, here is the output:

Client:
 Version:           19.03.1
 API version:       1.40
 Go version:        go1.12.7
 Git commit:        74b1e89e8a
 Built:             Wed Jul 31 15:18:18 2019
 OS/Arch:           windows/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          19.03.12
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.13.10
  Git commit:       48a66213fe
  Built:            Mon Jun 22 15:49:35 2020
  OS/Arch:          linux/amd64
  Experimental:     false
 containerd:
  Version:          v1.2.13
  GitCommit:        7ad184331fa3e55e52b890ea95e65ba581ae3429
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683
running

Test Docker is running at startup #51

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