Github user anandsubbu commented on the issue:
https://github.com/apache/metron/pull/846
Hi @ottobackwards , thanks for your review.
I prefixed a 'WARNING' to the message text so it would catch the eye of the
user. Also, I removed the else bit for docker running scenario, since this will
fail for the case where docker is not installed at all. If I retain the else
block, it would report saying 'Docker daemon is running'.
So, in summary here are the cases:
1. Docker installed and running would print:
```bash
Docker version 1.12.1, build 23cf638, experimental
```
2. Docker installed, but not running would print:
```bash
Docker version 1.12.1, build 23cf638, experimental
WARNING: Docker daemon is not running
```
3. Docker not installed would print:
```bash
-bash: docker: command not found
```
Let me know if this looks okay.
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