Mehul / Karen,
Did you ever get anywhere with this? I have just arrived at the same
problem and am looking for a solution too.
When I run:
ansible prod -i ./inventories/rax.py -c local -m debug -a var="{{
hostvars[groups['prod']|intersect(groups['monitoring_servers'])][0].rax_addresses['internal-network'][0].addr
}}"
I receive the error:
"msg": "the field 'args' has an invalid value, which appears to include a
variable that is undefined. The error was: ansible.vars.hostvars.HostVars
object has no element [u'prod-LON-mon-01']"
The intersect has correctly identified the server I wish to single out,
prod-LON-mon-01 so I think I'm pretty close to solving this myself. If I
hardcode that value in as hostvars['prod-LON-mon-01'] etc, etc, I get the
IP address I am after.
I'm sure there's an obvious mistake that I've made, if you, or anyone else
for that matter is able to spot it and point it out, I'd be grateful.
Thanks!
Dan.
On Friday, 6 November 2015 07:34:02 UTC, Mehul Ved wrote:
>
> Hi Karen,
> I already have these machines up and running and correctly tagged. I
> want to access hostvars of a machine from another machine. e.g.
> - I am on production web machine and need to get the database port, which
> is defined on db machine.
> - There are 2 db machines, production and beta, both of which have these
> variables.
> In this scenario, how do I ensure that I'm accessing the database port
> variable from the correct machine?
> If I define a variable in a role in my web playbook as
> app_db_port = hostvars[group['database']][0]['db_port']
> then I'm not sure if I'm getting the db port of production machine or beta
> machine.
>
>
> On Thu, Oct 29, 2015 at 7:18 AM, K Cheng <[email protected] <javascript:>>
> wrote:
>
>> Hey Mehul,
>>
>> I'm using dynamic inventory with AWS ec2 module. I had a quick glance at
>> your question so forgive me if I have the wrong idea in what you are asking.
>>
>> I had the scenario where I needed to get the number of instances that
>> were in the same environment and of the same role type and perform a count
>> of those instances.
>>
>> I managed to achieve it using this syntax (hopefully this will be of some
>> help to you for your scenario):
>>
>>
>> - name: Set a count variable of existing instances in the same
>> environment AND role type
>> set_fact:
>> start_count: "{{ groups['tag_environment_' + env] | default('') |
>> intersect(groups['tag_role_' + instance_role] | default('')) | length}}"
>>
>>
>> This allows me then tag instances in the same environment and the same
>> role type with an incrementing number:
>>
>> - name: Tag instances using the correct sequence number for that
>> environment and role
>> ec2_tag:
>> profile: "{{ aws_account_name }}"
>> region: "{{ region }}"
>> resource: "{{ item.id }}"
>> tags:
>> Name: "{{ instance_role }}{{
>> '%02d'|format(item.ami_launch_index|int + start_count|int + 1) }}.{{ env
>> }}.aws-{{ region_shortname[region] }}.{{ tld_name_internal }}"
>> with_items: "{{ ec2.instances | default({}) }}"
>>
>>
>> For example, when I launch 2 more instance with environment of stage and
>> role of web, and there were already 2 existing instances, then I would get
>> web03.stage,domain and web04.stage.domain as the tag.
>>
>> Hope this helps you with your scenario.
>>
>> Karen
>>
>> On Friday, October 23, 2015 at 8:09:29 PM UTC+10, Mehul Ved wrote:
>>>
>>> I have 4 machines on rackspace - two sets of machines, for production
>>> and beta. Each set has a web server and db server.
>>> Here's what the metadata for each machine would look like
>>>
>>> metadata: {
>>> group: web,
>>> set: production
>>> }
>>>
>>> metadata: {
>>> group: db,
>>> set: production
>>> }
>>>
>>> metadata: {
>>> group: web,
>>> set: beta
>>> }
>>>
>>> metadata: {
>>> group: db,
>>> set: beta
>>> }
>>>
>>> While deploying to machine set beta and group web, I need to get certain
>>> variables from machine set beta and group db. I have been trying various
>>> ways to ensure I get the right machine. I got a pointer from somebody on
>>> IRC to try intersection filter to get the correct machine from the group.
>>>
>>> So, I did this
>>> debug: var='groups['beta'] | intersection(groups['db'])'
>>>
>>> The above gives me a string with machine name
>>> "[u'beta_db1']"
>>>
>>> I am unable to use it as shown in variables example
>>> debug: var='hostvars[{{ group['beta'] | intersection['groups['db'])
>>> }}][0]]['db_port']
>>>
>>> It returns the result as
>>> "hostvars[[u'beta_db'][0]]['db_port']"
>>>
>>> I intend to use this in my vars/main.yml as
>>>
>>> app_db_port: <the variable defined for beta db machine>
>>>
>>> Am I in the right direction? If so how to handle the issue where
>>> hostvars needs a list but intersection returns a string? Or is there a
>>> better way to achieve what I want?
>>>
>>>
>>> --
>>> With Regards,
>>> Mehul Ved
>>>
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>
>
>
> --
> With Regards,
> Mehul Ved
>
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