Yes, there is a "groups" variable which is a dictionary with group name
keys where the values are a list of hosts in that group. That is,
groups[dev_cluster]
= ["server1", "server2", "server3"]. So you can do a inventory_hostname ==
groups[dev_cluster][0] comparison for the first item.
Note: I have not tested this in playbooks, only templates, and you might
run into bugs if your group has zero hosts. You also need to consider the
scenario where a host is in more than one group.
On Mon, Oct 2, 2017 at 2:06 AM, Marc L <marc.c.l...@gmail.com> wrote:
> I have some tasks that should only be processed if the host
> (inventory_hostname) is the first in the group of servers it's defined in.
>
> For example, here is my hosts file. Note that the group names are not
> fixed - the Role I want to use them in cannot rely on the name of the
> groups - it needs to be a bit more dynamic than that:
>
> *Hosts*
> server1
> server2
> server3
>
> [dev_cluster]
> server1
> server2
> server3
>
>
> [frontend_nodes]
> server1
> server2
>
>
> [frontend_nodes:vars]
> node_type_prefix=
> node_port=19043
> node_protocol=https
>
>
> [backend_nodes]
> server3
>
>
> [backend_nodes:vars]
> node_type_prefix=backend/
> node_port=19043
> node_protocol=https
>
> I have a playbook which I call like so, by passing in the name of the two
> groups - again - the name of these groups could vary, or I could add a 3rd
> or 4th group in.
>
> Playbook
> ---
> - hosts: frontend_nodes,backend_nodes
> connection: local
> gather_facts: no
> vars:
> ohp_auth_user: "username"
> ohp_auth_password: "password"
> roles:
> - { role: ansible-ohp-config-backup, node_name: "{{
> inventory_hostname }}" }
>
>
>
> Within my role, I have a bunch of tasks that I only want to run if the
> hostname is the first in the the group it is defined in that has been
> passed by the playbook.
> So given the example above, only run on server1 (the first in
> frontend_nodes), and server 3 (the first in backend_nodes)
>
> I was thinking the syntax would be something like:
>
> - name: Get OHP list of problems
> uri:
> url: "{{ node_protocol }}://{{ node_name }}:{{ node_port }}/{{
> node_type_prefix }}monitoring/problems"
> method: GET
> user: "{{ ohp_auth_user }}"
> password: "{{ ohp_auth_password }}"
> force_basic_auth: yes
> validate_certs: no
> status_code: 200
> timeout: 10
> return_content: yes
> dest: "{{ backup_folder }}/{{ node_name }}-problems.xml"
> when inventory_hostname = current_group[0]
> delegate_to: localhost
>
>
>
>
> Is there any way to achieve this?
>
> Worst case scenario I might need to pass a list of the "first" hosts into
> the role as a parameter and evaluate there.
>
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