Create a list from a dictionary cycle

[Softmax23]

Hi

I would like to create a list with this dict

{ "v3bf33-srv01": "eu-west0-a",

"v3bf33-srv02": "eu-west0-a",

 "v3bf33-srv03": "eu-west0-a",

 "v3bf33-srv04": "eu-west0-b",

"v3bf33-srv05": "eu-west0-b",

"v3bf33-srv06": "eu-west0-b",

"v3bf33-srv07": "eu-west0-c",

 "v3bf33-srv08": "eu-west0-c",

"v3bf33-srv09": "eu-west0-c" }

if a user ask 5 servers ( in a pipeline), cycle through servers of each value:

eu-west0-a,

eu-west0-b,

eu-west0-c,

then again , eu-west0-a, eu-west0-b, eu-west0-c .... until reach number of server need

The result should be a list containing only the server name.

E.g.:

- v3bf33-srv01 #eu-west0-a

- v3bf33-srv04 #eu-west0-b

- v3bf33-srv07 #eu-west0-c

- v3bf33-srv02 #eu-west0-a -

 v3bf33-srv05 #eu-west0-b

any help is welcome. ^^

[Vladimir Botka]

On Tue, 12 Jul 2022 02:18:57 -0700 (PDT)
Softmax23 <maximef...@gmail.com> wrote:

For example, the playbook below

shell> cat pb.yml
- hosts: localhost
vars:
servers:
srv01: a
srv02: a
srv03: a
srv04: b
srv05: b
srv06: b
srv07: c
srv08: c
srv09: c
arr: "{{ servers|dict2items|
groupby('value')|
map(attribute=1)|
map('map', attribute='key')|
list }}"
list_of_servers: "{{ tarr|flatten }}"
tasks:
- set_fact:
tarr: "{{ tarr|d(arr.0)|zip(item)|map('flatten') }}"
loop: "{{ arr[1:] }}"
- debug:
var: list_of_servers[:5]|to_yaml

1) Creates the matrix

arr:
- [srv01, srv02, srv03]
- [srv04, srv05, srv06]
- [srv07, srv08, srv09]

2) Transpose the matrix

tarr:
- [srv01, srv04, srv07]
- [srv02, srv05, srv08]
- [srv03, srv06, srv09]

3) Get the slice

list_of_servers[:5]: [srv01, srv04, srv07, srv02, srv05]

--
Vladimir Botka

[Softmax23]

it s not working for me :

fatal: [localhost]: FAILED! =>

 {"msg": "Invalid data passed to 'loop', it requires a list, got this instead: <generator object do_map at 0x7fe97cca3900>,

<generator object do_map at 0x7fe97cca39e0>, <generator object do_map at 0x7fe97cca3a50>].

Hint: If you passed a list/dict of just one element, try adding wantlist=True to your lookup invocation or use q/query instead of lookup."}

a co worker try too .. .same result.   i think i  will go  in BASH... i am sure it will work .  ahahah

[Softmax23]

When i do

      arr: "{{ servers|dict2items|

                      groupby('value')|

                      map(attribute=1)|

                      map('map', attribute='key')|

                      list }}"

      list_of_servers: "{{ tarr|flatten }}"

  tasks:

    - debug:

        var: arr

the result , no data.  

TASK [debug] ******************************************************************************************************************************

ok: [localhost] => {
    "arr": "[<generator object do_map at 0x7f1c51cac4a0>, <generator object do_map at 0x7f1c51cac9e0>,

 <generator object do_map at 0x7f1c51caca50>]"
}

On Tuesday, July 12, 2022 at 11:59:52 AM UTC+2 vbo...@gmail.com wrote:

[Jorge Rúa]

I think there's an typo here. There's an extra 't' in list_of_servers: "{{ tarr|flatten }}" should be 

list_of_servers: "{{ arr|flatten }}"

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[Softmax23]

thx for looking, but the error come from the task débug:

tasks:

    - debug:

        var: arr

not tarr .