Hello!
On Saturday, 3 May 2014 09:02:19 UTC+12, Mike Trienis wrote:
>
> I was wondering if ansible has a way to generate a unique identifier?
>
I don't think Ansible itself has that capability built in. Luckily, you can
easily do this yourself. As another response said, it also depends on how
unique you want it to be. Just the other day I had to solve that problem as
well. I settled for fine-grained time stamp plus random characters, which
in my case was guaranteed to be unique enough. For the random characters I
ended up taking a recipe I had found somewhere (sorry, can't find the URL
anymore) on how to create a random string, combined it in the shell with
the datetime output and phrased this as an Ansible task. Like so:
- name: Create a unique ID
shell: echo "`date +"%Y%m%d%H%M%S"`-$(cat /dev/urandom | tr -cd [:alpha:]
| tr '[:upper:]' '[:lower:]' | head -c 4)"
register: my_unique_id
This takes a datetime stamp and attaches some random letters. You can drop
the "date" output and just go with random letters, for example. The "head
-c 4" in the end determines how many random letters there will be appended.
Just take that echo line and paste it into the shell, experiment around
with different variations until you get the ID you want.
Later on in your playbook, you can then refer to the unique ID like so:
- name: Create a directory named after my unique ID
file: path=/tmp/{{ my_unique_id.stdout }} state=directory
Juergen
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