iterate over disk devices

[Filip Slunecko]

Hi all,

Is there a way how ti easily iterate over facter_blockdevices?

Example:

      - name: checking disks for failure
        command:  /usr/sbin/smartctl /dev/{{ item }}
        with_items: facter_blockdevices
        register: smart_out

Facts:
"facter_blockdevices": "sda,sdb,sdc,sdd,sde,sdf",

Thanks!

Filip

[Věroš Kaplan]

Ahoj Filip,

I would consider separating facter_blockdevices fact to a list. ( see https://gist.github.com/VerosK/9853931 ).

I don't  now if this is the right Ansible-way, but at least it works.

--Věroš

---

- hosts: localhost

  vars:

    facter_blockdevices: sda,sdb,sdc,sdd,sde,sdf

  gather_facts: no

  tasks:

    - name: Separate facts

      set_fact: blockdevices="{{facter_blockdevices.split(',')}}"

    - name: Show the devices

      shell: echo {{ item }}

      with_items: blockdevices

[Paul Durivage]

Hi Filip,

You'll find that calling the split method on the string works.

See this Gist:  https://gist.github.com/angstwad/9893480

12345678910

--- - name: Test split hosts: localhost gather_facts: false vars: - facter_blockdevices: "sda,sdb,sdc,sdd,sde,sdf" tasks: - name: Let's split debug: var=item with_items: "facter_blockdevices.split(',')"

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[Filip Slunecko]

Thank you!

I tried jinja filters and they do not work :).
I assume I can use any python function there right?

[Paul Durivage]

Hi Filip,

No problem!

No, not every Python function is available in Jinja.  In that example, you see we can use any method associated with string in Jinja, because the string is still an object, and it's methods come with it.  Just remember that you always have access to the objects methods.

For future reference, by the way, the list of standard Jinja filters are here: http://jinja.pocoo.org/docs/templates/#builtin-filters

I'm actually not sure if all the Ansible filters are documented in a single place, but IIRC they are all in the following Python file:

https://github.com/ansible/ansible/blob/devel/lib/ansible/runner/filter_plugins/core.py

To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/48ab23b2-5961-41be-a2b2-c806680e13ca%40googlegroups.com.