How to split string twice in ansible playbook hosts section.

[Know-Your-Tech]

Below is how i call my ansible-playbook and pass application names as parameters APP1 & APP2

ansible-playbook -i /web/aes/admin/playbooks/updated.hosts /web/aes/admin/playbooks/split.yml -e ENV=qa -e NODE=cluster -e instance_name=APP1,APP2

Playbook:

---
- hosts: "{{ [ENV] | product(instance_name.split(',')) | product([NODE]) | product(['wladmin_mmsplit'])|map('flatten')|map('join', '_') }}"
  user: wladmin
  gather_facts: no

I get the desired Output as below:

PLAY [['qa_APP1_cluster_wladmin_mmsplit', 'qa_APP2_cluster_wladmin_mmsplit']]

The problem occurs when i pass the application names as APP1-brazil & APP2-Chile

and wish the same output as before.

ansible-playbook -i /web/aes/admin/playbooks/updated.hosts /web/aes/admin/playbooks/split.yml -e ENV=qa -e NODE=cluster -e instance_name=APP1-brazil,APP2-Chile

I tried the below but i get error:

- hosts: "{{ [ENV] | product(instance_name.split(',') | split('-')[0]) | product([NODE]) | product(['wladmin_mmsplit'])|map('flatten')|map('join', '_') }}"

Error in output:

ERROR! template error while templating string: expected token ',', got '['. String: {{ [ENV] | product(instance_name.split(',') | split('-')[0]) | product([NODE]) | product(['wladmin_mmsplit'])|map('flatten')|map('join', '_') }}

Can you please suggest how can i address this requirement? 

 

[Richard Megginson]

`split` is not an ansible filter - you cannot use it like `| split(something)` - you have to use as a string method which is why `instance_name.split(',')` works

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[Know-Your-Tech]

Thanks, Richard, but I was looking for a specific solution which seems to be tricky.

[Vladimir Botka]

On Tue, 27 Dec 2022 09:47:57 -0700
Richard Megginson <rmeg...@redhat.com> wrote:

> `split` is not an ansible filter

Wrong. The filter *split* is available since 2.11. See
https://docs.ansible.com/ansible/latest/playbook_guide/playbooks_filters.html#manipulating-strings

--
Vladimir Botka

[Vladimir Botka]

> On Tue, Dec 27, 2022 at 7:04 AM Know-Your-Tech <knowy...@gmail.com> wrote:
> >
> > ansible-playbook -i /web/aes/admin/playbooks/updated.hosts
> > /web/aes/admin/playbooks/split.yml -e ENV=qa -e NODE=cluster -e
> > instance_name=APP1,APP2
> >
> > Playbook:
> >
> > ---
> > - hosts: "{{ [ENV] | product(instance_name.split(',')) | product([NODE]) |
> > product(['wladmin_mmsplit'])|map('flatten')|map('join', '_') }}"

Put the logic into the inventory plugin *constructed*. See
shell> ansible-doc -t inventory ansible.builtin.constructed

In the example below, I'll use another inventory plugin *generator*
which you don't need because you obviously have another source of the
inventory. When you try the code below in your environment use this
source instead of 02-generator.yml. See
shell> ansible-doc -t inventory ansible.builtin.generator

I've ignored the case of the parameters.

1) Create the inventory

shell> tree inventory/
inventory/
├── 01-hosts
├── 02-generator.yml
└── 03-constructed.yml

shell> cat inventory/01-hosts
localhost

shell> cat inventory/02-generator.yml
plugin: ansible.builtin.generator
hosts:
name: "{{ env }}_{{ instance }}_{{ node }}_{{ ext }}"
layers:
env:
- dev
- qa
- prod
instance:
- app1
- app2
node:
- cluster1
- cluster2
ext:
- wladmin_mmsplit

shell> cat inventory/03-constructed.yml
plugin: ansible.builtin.constructed
use_extra_vars: true
compose:
layer_env: ENV.split(',')
layer_node: NODE.split(',')
layer_instance: instance_name.split(',')
groups:
my_group: inventory_hostname.split('_').0 in layer_env and
inventory_hostname.split('_').1 in layer_instance and
inventory_hostname.split('_').2 in layer_node

2) Test inventory

shell> ansible-inventory -i inventory --list --yaml
all:
children:
ungrouped:
hosts:
dev_app1_cluster1_wladmin_mmsplit: {}
dev_app1_cluster2_wladmin_mmsplit: {}
dev_app2_cluster1_wladmin_mmsplit: {}
dev_app2_cluster2_wladmin_mmsplit: {}
localhost: {}
prod_app1_cluster1_wladmin_mmsplit: {}
prod_app1_cluster2_wladmin_mmsplit: {}
prod_app2_cluster1_wladmin_mmsplit: {}
prod_app2_cluster2_wladmin_mmsplit: {}
qa_app1_cluster1_wladmin_mmsplit: {}
qa_app1_cluster2_wladmin_mmsplit: {}
qa_app2_cluster1_wladmin_mmsplit: {}
qa_app2_cluster2_wladmin_mmsplit: {}

3) Test inventory group *my_group*

shell> ansible-inventory -i inventory --list --yaml -e ENV=qa -e NODE=cluster2 -e instance_name=app1,app2
all:
children:
my_group:
hosts:
qa_app1_cluster2_wladmin_mmsplit:
ENV: qa
NODE: cluster2
instance_name: app1,app2
layer_env:
- qa
layer_instance:
- app1
- app2
layer_node:
- cluster2
qa_app2_cluster2_wladmin_mmsplit:
ENV: qa
NODE: cluster2
instance_name: app1,app2
layer_env:
- qa
layer_instance:
- app1
- app2
layer_node:
- cluster2
ungrouped:
hosts:
dev_app1_cluster1_wladmin_mmsplit:
...

4) Use *my_group* in a playbook

shell> cat pb.yml
- hosts: my_group
tasks:
- debug:
var: ansible_play_hosts_all
run_once: true

shell> ansible-playbook -i inventory -e ENV=qa -e NODE=cluster2 -e instance_name=app1,app2 pb.yml

PLAY [my_group]
*****************************************************************

TASK [debug]
*****************************************************************
ok: [qa_app1_cluster2_wladmin_mmsplit] =>
ansible_play_hosts_all:
- qa_app1_cluster2_wladmin_mmsplit
- qa_app2_cluster2_wladmin_mmsplit
...

5) The items added to the inventory (02-generator.yml in this example)

instance:
- app1
- app2
- app3-brazil

will be automatically available for selection

shell> ansible-playbook -i inventory -e ENV=qa -e NODE=cluster2 -e instance_name=app1,app3-brazil pb.yml

PLAY [my_group]
******************************************************************************

TASK [debug]
*********************************************************************************
ok: [qa_app1_cluster2_wladmin_mmsplit] => ansible_play_hosts_all:
- qa_app1_cluster2_wladmin_mmsplit
- qa_app3-brazil_cluster2_wladmin_mmsplit
...

--
Vladimir Botka