List of all ansible_ssh_host in group

[Andrew Teil]

Hi. I have the following inventory structure

master1 ansible_ssh_host=10.0.45.11

master2 ansible_ssh_host=10.0.45.12

master3 ansible_ssh_host=10.0.45.13

slave1 ansible_ssh_host=10.0.45.51

slave2 ansible_ssh_host=10.0.45.52

slave3 ansible_ssh_host=10.0.45.53

[master_servers]

master1

master2

master3

...

Now I need a URL that looks something like this zk://10.0.45.11:2181,10.0.45.12:2181,10.0.45.13:2181/mesos

For that reason I need a list of ansible_ssh_host variables for all servers in the group master_servers.

I ended up with this

[hostvars[groups['master_servers'][0]].ansible_ssh_host, hostvars[groups['master_servers'][1]].ansible_ssh_host, hostvars[groups['master_servers'][2]].ansible_ssh_host]

but this solution takes only three servers not all in the group

[Matt Martz]

We do something like this for our mongodb connection string:

'mongodb://{% for h in groups.database %}{{ h }}{% if not loop.last %},{% endif %}{% endfor %}/{{ mongo_database }}?replicaSet={{ mongo_replicaset }}'

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Matt Martz
@sivel
sivel.net

[Takeshi Yaegashi]

Hello,

You can achieve it by using the following jinja2 template:

---

- hosts: localhost

  gather_facts: no

  vars:

    zkurl: |

      {%- set o = [] %}

      {%- for i in groups.master_servers %}

      {%-   if o.append(hostvars[i].ansible_ssh_host+':2181') %}

      {%-   endif %}

      {%- endfor %}

      zk://{{ ','.join(o) }}/mesos

  tasks:

    - debug:

        var: zkurl

Sample session:

$ ansible-playbook -i hosts zk.yml

PLAY [localhost] ************************************************************** 

TASK: [debug ] **************************************************************** 

ok: [localhost] => {

    "var": {

        "zkurl": "zk://10.0.45.11:2181,10.0.45.12:2181,10.0.45.13:2181/mesos"

    }

}

PLAY RECAP ******************************************************************** 

localhost                  : ok=1    changed=0    unreachable=0    failed=0   

Regards,

-- 

YAEGASHI Takeshi <yaeg...@debian.org>