Looping over a set of host in a playbook?

[Sébastien Han]

Hello,

I'm trying to loop over a set of host, get their IP and then append the result to a file.

Currently the action looks like this:

- name: build rings

  command: swift-ring-builder {{ item.service }}.builder add z1-{{ hostvars[inventory_hostname]["ansible_bond1.2108"].ipv4.address }}:{{ item.port }}/sdb1 100

           chdir=/etc/swift

  with_items:

    - { service: 'account', port: '6002' }

    - { service: 'container', port: '6001' }

    - { service: 'object', port: '6000' }

    - groups.storages

Basically I'd like to look over 'groups.storages' in {{ hostvars[inventory_hostname]["ansible_bond1.2108"].ipv4.address }.

Is it doable?

This looks like this https://coderwall.com/p/w5o6eq, althought it doesn't seem to work with the new convention "{{ }}"

Thanks in advance :).

Cheers!

[Sébastien Han]

Up?

[Michael DeHaan]

Seems like you *might* mean with_nested seeing you are looping over what appears to be two different lists.

Or else "groups.storages" is something else.  That looks like the odd one out to me.

Everything else looks fine, so when you say "doesn't seem to work", more info would be helpful about how it was not working?

Thanks!

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[Sébastien Han]

Hello Michael,

Thanks for your response.

What I'm trying to achieve is exactly what is described in this post: https://coderwall.com/p/w5o6eq

As an example, I tried the following:

- name: iterate over hosts

  command: echo {{ hostvars.{{ item }}.ansible_hostname }}

  with_items:

    - groups.storages

  ignore_errors: true

  tags: gz

As far as I understand this is supposed to return every hostname, instead I get:

changed: [ceph001.enocloud.com] => (item=groups.storages) => {"changed": true, "cmd": ["echo", "{{hostvars.{{item}}.ansible_hostname}}"], "delta": "0:00:00.003401", "end": "2014-04-17 10:11:03.764429", "item": "groups.storages", "rc": 0, "start": "2014-04-17 10:11:03.761028", "stderr": "", "stdout": "{{hostvars.{{item}}.ansible_hostname}}"}

Any idea? Furthermore, the final goal is to collect the ip address of the following intertace: ansible_bond1.2108. Not sure if it's reachable given this: https://github.com/ansible/ansible/issues/6879

Thanks for your help.

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Regards,

Sébastien Han.

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[Michael DeHaan]

Got it!  This is the problem line:

  command: echo {{ hostvars.{{ item }}.ansible_hostname }}

It should look like this:

{{ hostvars[item].ansible_hostname }}

Basically templates don't nest, and inside of template expressions, you can just use variables mostly as if they were Python.

Hope that helps!

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[Sébastien Han]

Thanks! This is getting better and better:

Modifying my playbook like this:

- name: iterate over hosts

  command: ping -c 1 {{ hostvars[item]["ansible_bond1.2108"].ipv4.address }}

  with_items: groups.storages

  ignore_errors: true

  tags: gz

Now I get:

< TASK: swift-proxy | iterate over hosts >

 ----------------------------------------

        \   ^__^

         \  (oo)\_______

            (__)\       )\/\

                ||----w |

                ||     ||

failed: [ceph0010] => (item=ceph0020) => {"changed": true, "cmd": ["ping", "-c", "1", "{{hostvars[item][ansible_bond1.2108].ipv4.address}}"], "delta": "0:00:00.005304", "end": "2014-04-17 17:59:50.851952", "item": "ceph0020", "rc": 1, "start": "2014-04-17 17:59:50.846648"}

stderr: ping: unknown host

...ignoring

failed: [ceph0010] => (item=ceph0030) => {"changed": true, "cmd": ["ping", "-c", "1", "{{hostvars[item][ansible_bond1.2108].ipv4.address}}"], "delta": "0:00:00.005213", "end": "2014-04-17 17:59:51.026424", "item": "ceph0030", "rc": 1, "start": "2014-04-17 17:59:51.021211"}

stderr: ping: unknown host

...ignoring

failed: [ceph0010] => (item=ceph0040) => {"changed": true, "cmd": ["ping", "-c", "1", "{{hostvars[item][ansible_bond1.2108].ipv4.address}}"], "delta": "0:00:00.005305", "end": "2014-04-17 17:59:51.200587", "item": "ceph0040", "rc": 1, "start": "2014-04-17 17:59:51.195282"}

stderr: ping: unknown host

...ignoring

failed: [ceph0010] => (item=ceph0050) => {"changed": true, "cmd": ["ping", "-c", "1", "{{hostvars[item][ansible_bond1.2108].ipv4.address}}"], "delta": "0:00:00.005345", "end": "2014-04-17 17:59:51.374977", "item": "ceph0050", "rc": 1, "start": "2014-04-17 17:59:51.369632"}

stderr: ping: unknown host

...ignoring

failed: [ceph0010] => (item=ceph0060) => {"changed": true, "cmd": ["ping", "-c", "1", "{{hostvars[item][ansible_bond1.2108].ipv4.address}}"], "delta": "0:00:00.005203", "end": "2014-04-17 17:59:51.548855", "item": "ceph0060", "rc": 1, "start": "2014-04-17 17:59:51.543652"}

stderr: ping: unknown host

...ignoring

Any idea?

Thanks again in advance :)

[Michael DeHaan]

"ansible_bond1.2108"

This part needs quotes around it.

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[Sébastien Han]

I'm confused, quotes are already there.

command: ping -c 1 {{ hostvars[item]["ansible_bond1.2108"].ipv4.address }}

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[Sébastien Han]

No more ideas?

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[Strahinja Kustudić]

Try:

{{ hostvars[item]['ansible_bond1.2108']['ipv4']['address'] }}

No more ideas?

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Regards,

Sébastien Han.

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[Sébastien Han]

Same error :(

[Strahinja Kustudić]

Could you try instead of command module something like:

debug: msg="{{ hostvars[item]['ansible_bond1.2108']['ipv4']['address'] }}"

And run ansible-playbook with -vvvv.

[Sébastien Han]

Thanks for you help, this is what I got:

http://pastebin.com/qfLyS9yi

Cheers.

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[Strahinja Kustudić]

You didn't understand me, I would like you to replaced the whole "command: ping -c 1 {{ hostvars[item]["ansible_bond1.2108"].ipv4.address }}" line with the debug line I wrote in my previous reply.

[Sébastien Han]

Arf sorry, I read too fast.

http://pastebin.com/H1Vzmb7w

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[Strahinja Kustudić]

I don't understand, it's like it is not recognizing the hostvars keyword?

[Sébastien Han]

I don't know :/

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[Sébastien Han]

No one?

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[Stefan Mojsilovic]

Had the same problem. Managed to solve it using this way to access the value:

debug: msg="{{ hostvars[item]['ansible_default_ipv4']['address'] }}"
with_items: groups.web_servers

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Sébastien Han.

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