On Fri, 9 Feb 2018 01:35:08 -0800 (PST)
Bing Hsueh <bing.tangb...@gmail.com> wrote:

> > ERROR! The field 'serial' has an invalid value, which includes an   
> >> undefined variable. The error was: 'batch_deploy' is undefined  

Ansible is complaining that you are referencing a variable
"batch_deploy", and that it is not defined anywhere.

> inventory.yml
> ---
> deployservers:
>     vars:
>          deploy_batch: 1

Here, the variable is called "deploy_batch".

> playbook.yml
> ---
>   - name: test rolling update by batch size
>     hosts: deployservers
>     serial: "{{ batch_deploy }}"

Here, the variable is called "batch_deploy". E.g. not the same as in
the inventory file (swapped batch/deploy in the name).

Best regards

Branko Majic
XMPP: bra...@majic.rs
Please use only Free formats when sending attachments to me.

Бранко Мајић
XMPP: bra...@majic.rs
Молим вас да додатке шаљете искључиво у слободним форматима.

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