How to merge inventories from other ansible projects?

[Glen Huang]

I have existing two ansible projects:

proj1/inventory/host.yml

all:

  vars:...

  hosts: ...

  children: ...

proj2/inventory/host.yml

all:

  vars:...

  hosts: ...

  children: ...

I want to create a new ansible project, whose inventory is the automatic merging of the existing two, which should be something like:

all:

  children:

    proj1:

      vars: ... # from proj1's all.vars

      hosts: ... # from proj1's all.hosts

      children: ... # from proj1's all.children

    proj2:

      vars: ... # from proj2's all.vars

      hosts: ... # from proj2's all.hosts

      children: ... # from proj2's all.children

Is this something easily achievable in ansible?

Thanks in advance.

[Brian Coca]

You can just reference both when calling ansible-playbook:

ansible-playbook -i /inv1 -i /inv2 play.yml

Or If you want a static copy:

ansible-inventory -i /inv1 -i /inv2 --exports --list --yaml > newmerged.yml


--
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Brian Coca

[Glen Huang]

Thanks for the quick reply. However I don't think it works.

Maybe I was not clear. Here is a small test case to demonstrate the issue:

proj1/inventory/hosts.yml

all:
  vars:
    bar: from 1 all
  hosts:
    example1.com:

proj2/inventory/hosts.yml

all:
  vars:
    bar: from 2 all
  hosts:
    example2.com:

proj3/playbook.yml

- hosts: example1.com
  connection: local
  tasks:
    - debug:
        var: bar

And run the playbook with

ansible-playbook -i ../proj1/inventory -i ../proj2/inventory playbook.yml

Apparently proj2's all.vars will override proj1's, so bar shows "from 2 all", which is not what I want.

I want proj3's inventory to have two groups, group1 and group2,  where proj1's all.vars become group1's group vars, ditto for proj2, so all.vars don't get overridden. In the test case, I'd like bar to be "from 1 all"

Is this something possible to do?

[Brian Coca]

nothing will autogenerate discrete groups that way, conflicts will be
resolved by overwriting.
You'll have to script something that processes each inventory and
rewrites the entries to what you want.
--
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Brian Coca

[Rowe, Walter P. (Fed)]

conflicts will be resolved by overwriting precedence.

Walter
--
Walter Rowe, Division Chief
Infrastructure Services, OISM
Mobile: 202.355.4123

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[Glen Huang]

Guess I'll use a script to generate the inventory, thanks for the heads up.